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WO2019235392A1 - Dispositif de commutation optique - Google Patents

Dispositif de commutation optique Download PDF

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Publication number
WO2019235392A1
WO2019235392A1 PCT/JP2019/021829 JP2019021829W WO2019235392A1 WO 2019235392 A1 WO2019235392 A1 WO 2019235392A1 JP 2019021829 W JP2019021829 W JP 2019021829W WO 2019235392 A1 WO2019235392 A1 WO 2019235392A1
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WIPO (PCT)
Prior art keywords
optical
optical switch
switch
ports
signal
Prior art date
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Ceased
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PCT/JP2019/021829
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English (en)
Japanese (ja)
Inventor
勇介 村中
橋本　俊和
イブラヒム サラ
達志 中原
陽平 坂巻
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NTT Inc
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Nippon Telegraph and Telephone Corp
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Publication of WO2019235392A1 publication Critical patent/WO2019235392A1/fr
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/015—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction
    • G02F1/025—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction in an optical waveguide structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements

Definitions

  • the present invention relates to an optical switch device for a node device, which is an important optical component for supporting a large-capacity optical communication network.
  • An optical communication network is composed of a plurality of links and node devices, and research and development for high-speed and large-capacity communication is being conducted in each of them. While the link speeds up signals and multiplexes the wavelength, the node device is required to have a technology for flexibly changing the path connecting the node devices in order to realize efficient traffic.
  • Various transmission systems have been studied as node technology, and optical switching technology that does not require optical / electrical conversion is effective in terms of power consumption and delay of network devices. Active optical transmission systems have been actively studied.
  • optical circuit switching Optical Circuit Switching: OCS
  • OPS optical packet switching
  • a link is established between specific node devices, and continuous data transmission is possible.
  • an optical path is generally set by occupying a specific wavelength band.
  • the link wavelength is occupied, transfer from other node devices is hindered.
  • the OCS system is suitable for cases where high reliability is required because there is little packet loss, and when large amounts of data are stably transmitted.
  • connectionless transmission is possible without establishing a link between node devices.
  • a label is given to an optical packet to be transmitted in advance, and the packet is transferred while considering collision avoidance in each node device based on the label.
  • the OPS method is suitable for data in which traffic fluctuation of transmission data is large or data that requires low delay.
  • Non-Patent Document 1 a flexible network based on a combination of these two methods is considered promising for future large-capacity optical communication networks, and research on node technologies for realizing them is underway.
  • Such an optical switch is a thermo-optic (TO) switch configured on a planar lightwave circuit (PLC), an InP-based electroabsorption modulator (EAM), or Mach-Zehnder interference.
  • a switch using a meter (Mach-Zehnder Interferometer: MZI), a semiconductor optical amplifier (SOA), a LiNbO 3 phase modulator type switch, and the like have been researched and developed.
  • MZI Machine-Zehnder Interferometer
  • SOA semiconductor optical amplifier
  • LiNbO 3 phase modulator type switch and the like
  • FIG. 15 shows a perspective view of a conventional 2 ⁇ 2 optical switch element.
  • the 2 ⁇ 2 optical switch element shown in FIG. 15 is a directional coupler type optical switch element.
  • an optical input section (I in the figure) On the n-InP substrate, an optical input section (I in the figure), an optical switch section (II), and an optical output Part (same III) and light absorption part (same IV) are provided.
  • an i-MQW layer 5, an i-InP clad layer 4, and a p-InP clad layer 3 are laminated on an n-InP substrate 6 in order.
  • the InP cladding layer 3 has a structure as shown in FIG. 15 and is formed in a thin line shape. Further, on both the p-InP cladding layer 3 above p-InP cladding layer 3 of one of the optical switching unit II and the light absorbing portion IV is, p + -InGaAs capping layer 2 is formed, p + -InGaAs cap On the layer 2, p-type electrodes 1, 10, and 11 are formed. An n-type electrode 7 is formed on the back surface of the n-InP substrate 6. Reference numeral 9 denotes an electrical separation groove.
  • the input signal light is guided in a portion located in the lower part of the p-InP clad layer 3 formed in a thin line shape in the i-MQW layer 5.
  • the i-MQW layer 5 positioned below the p-InP cladding layer 3 provided in the light input part I, the light switch part II, the light output part III, and the light absorption part IV is respectively referred to as an input optical waveguide and an optical switch light. These are referred to as a waveguide, an output optical waveguide, and a light absorption optical waveguide.
  • the input signal light is input to one of the input optical waveguides (A or B in FIG. 15) and guided to the optical switch optical waveguide.
  • a desired voltage is applied between the p-type electrode 1 and the n-type electrode 7 provided in the optical switch unit II, for example, due to a multiple quantum well (MQW) structure.
  • MQW multiple quantum well
  • QCSE Quantum Confined Stark Effect
  • the light absorption part IV a desired electric field is applied between the p-type electrode 10 or 11 and the n-type electrode 7 provided in a light absorption optical waveguide different from the light absorption optical waveguide to which signal light is input.
  • the crosstalk light leaking from the optical switch optical waveguide is absorbed by the optical absorption optical waveguide, while the signal light output from the optical switch optical waveguide is directed to the output optical waveguide (C or D in FIG. 15).
  • an optical switch element capable of reducing the influence of leakage light from the optical switch optical waveguide is realized.
  • WSS Wavelength selective switches
  • the optical switch is required to have high speed.
  • a structure in which carriers are injected into a semiconductor such as InP or Si and switched by an electro-optic effect is generally used.
  • a semiconductor optical waveguide has a strong optical confinement, an optical fiber is used. Connection loss and the propagation loss tends to increase due to carrier absorption and the like.
  • the loss in the node device can be compensated by an amplifier such as an EDFA (Erbium-Doped Fiber Amplifier), but it is not preferable because it deteriorates the signal quality, and low loss is important in the optical switch device.
  • EDFA Erbium-Doped Fiber Amplifier
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a low-loss optical switch device that realizes a node device that transfers an optical signal of an optical circuit switching method and an optical signal of an optical packet switching method. .
  • An optical switch device for solving the above-mentioned problems is In an optical switch device provided in a node device constituting a network and having a plurality of optical input ports and a plurality of optical output ports,
  • the optical switch device includes a plurality of optical switches,
  • the optical switch has an optical waveguide structure made of a material whose refractive index or absorption coefficient changes in the order of nanoseconds, and an OCS optical signal which is an optical signal of an optical circuit switching system by changing the refractive index or the absorption coefficient.
  • OPS optical signal which is an optical packet switching type optical signal is switched.
  • the node device is a ROADM (Reconfigurable Optical Add / Drop Multiplexer) node device having a wavelength selective switch
  • the optical switch device is An add / drop process between the OCS optical signal and the OPS optical signal is arranged after the wavelength selective switch and switches the OCS optical signal and the OPS optical signal to the preset optical output port.
  • a first optical switch unit comprising a plurality of the optical switches that perform the switching, and a plurality of the optical switches that perform the add / drop processing of the OPS optical signal by switching the OPS optical signal to the preset optical output port.
  • a second optical switch unit comprising a plurality of the optical switches that perform the switching, and a plurality of the optical switches that perform the add / drop processing of the OPS optical signal by switching the OPS optical signal to the preset optical output port.
  • An optical switch device for solving the above-mentioned problems is as follows.
  • a network controller that controls switching in the first optical switch unit, and a label table that controls switching in the second optical switch unit based on a label of the OPS optical signal.
  • the first optical switch unit includes an N ⁇ (K + L) optical switch having an N ⁇ (K + L) port configuration and an (K + L) ⁇ N optical switch having a (K + L) ⁇ N port configuration
  • the second optical switch unit includes an M ⁇ K optical switch having an M ⁇ K port configuration and a K ⁇ M optical switch having a K ⁇ M port configuration
  • the L ports on the output side of the N ⁇ (K + L) optical switch are connected to the L ports on the input side of the (K + L) ⁇ N optical switch, and K on the output side of the N ⁇ (K + L) optical switch.
  • the K ports on the output side of the M ⁇ K optical switch are connected to the K ports on the input side of the K ⁇ M optical switch.
  • An optical switch device for solving the above-mentioned problems is as follows.
  • the N ⁇ (K + L) optical switch, the (K + L) ⁇ N optical switch, the M ⁇ K optical switch, and the K ⁇ M optical switch are each a 1 ⁇ J distribution selection type optical switch having a 1 ⁇ J port configuration.
  • the 1 ⁇ J distribution selection type optical switch includes a 1 ⁇ J optical coupler and J light absorption gates.
  • An optical switch device for solving the above-mentioned problems is as follows.
  • J is an integer greater than or equal to 2
  • the N ⁇ (K + L) optical switch, the (K + L) ⁇ N optical switch, the M ⁇ K optical switch, and the K ⁇ M optical switch are each a 1 ⁇ 2 Mach-Zehnder interferometer or a plurality of 2 ⁇ 2 Mach-Zehnder interferometers.
  • a 1 ⁇ J optical switch having a 1 ⁇ J port configuration consisting of: 1 ⁇ 2 Mach-Zehnder interferometer or at least one 1 ⁇ J optical switch,
  • the 1 ⁇ J optical switch connects one of two ports on the input side of the subsequent 2 ⁇ 2 Mach-Zehnder interferometer to each of the two ports on the output side of the previous 2 ⁇ 2 Mach-Zehnder interferometer,
  • a plurality of the 2 ⁇ 2 Mach-Zehnder interferometers are connected in multiple stages in a tree shape.
  • An optical switch device for solving the above-mentioned problems is as follows.
  • a light absorption gate is provided after the N ⁇ (K + L) optical switch.
  • An optical switch device for solving the above-mentioned problems is as follows.
  • the optical switch device Between the N ⁇ (K + L) optical switch and the (K + L) ⁇ N optical switch, between the N ⁇ (K + L) optical switch and the K ⁇ M optical switch, and between the M ⁇ K optical switch and the (K + L) ⁇ N optical switches are connected to each other by an optical waveguide, and an optical waveguide having an intersection with another optical waveguide is used in some of the optical waveguides.
  • the N ⁇ (K + L) optical switch, the (K + L) ⁇ N optical switch, the M ⁇ K optical switch, the K ⁇ M optical switch, and the optical waveguide are monolithically integrated on the same chip.
  • An optical switch device for solving the above-mentioned problems is as follows.
  • the optical switch device Between the N ⁇ (K + L) optical switch and the (K + L) ⁇ N optical switch, between the N ⁇ (K + L) optical switch and the K ⁇ M optical switch, and between the M ⁇ K optical switch and the The (K + L) ⁇ N optical switch is connected to each other by an optical waveguide, and the N ⁇ (K + L) optical switch and the (K + L) ⁇ N optical switch are arranged so that all the optical waveguides do not cross each other.
  • the N ⁇ (K + L) optical switch, the (K + L) ⁇ N optical switch, the M ⁇ K optical switch, the K ⁇ M optical switch, and the optical waveguide are monolithically integrated on the same chip.
  • An optical switch device for solving the above-mentioned problems is In the optical switch device according to the eighth or ninth invention, All of the optical input port and the optical output port of the optical switch device are arranged at one end of the chip.
  • a low-loss optical switch device that realizes a node device that transfers an optical circuit switching type optical signal and an optical packet switching type optical signal.
  • FIG. 3 is a graph showing the transmittance with respect to an applied voltage in a light absorption gate of the distribution selection type optical switch shown in FIG. 1.
  • FIG. 3 is a graph showing a transmittance with respect to an injection current in each optical output port of the MZI type optical switch shown in FIG. 2.
  • FIG. It is sectional drawing which shows the structure of the optical waveguide of the optical switch shown in FIG.1 and FIG.2.
  • OPS optical signal A high-speed optical switch used for switching an OPS optical signal (hereinafter referred to as an OPS optical signal) will be described.
  • the switching mechanism the distribution selection type optical switch 20 shown in FIG. 1 or the MZI type optical switch 30 shown in FIG. 2 is used. These can also be used for switching of OCS optical signals (hereinafter referred to as OCS optical signals).
  • the input light input from the optical input port PI is divided into two light beams using a 1 ⁇ 2 optical coupler 21 which is a multi-mode interference (MMI) optical coupler.
  • the waveguides 22 1 and 22 2 are branched, and the two optical waveguides 22 1 and 22 2 are connected to the light absorption gates 23 1 and 23 2 of the respective optical output ports PO 1 and PO 2 .
  • the light absorption gates 23 1 and 23 2 each have an n-InP substrate, an n-InP lower cladding layer, an InGaAsP core layer, a p-InP upper cladding layer, and a p + -InGaAs cap layer.
  • the light of the optical waveguide 22 1 or 22 2 that does not require output is absorbed by the light absorption gate 23 1 or 23 2.
  • switching can be performed.
  • SOA or the like may be used for the EAM used as the light absorption gate.
  • a 1 ⁇ 2 optical coupler 31 which is an MMI optical coupler similar to FIG. 1 is used to input light input from the optical input port PI into two optical waveguides 32 1 and 32 2.
  • the input light branched into two is subjected to a phase difference due to phase modulation controlled by the control electrodes 33 1 and 33 2 in the two optical waveguides 32 1 and 32 2 , and then the MMI optical coupler. They are recombined using a certain 2 ⁇ 2 optical coupler 34.
  • n is an integer of 0 or more. Therefore, if a phase modulation region is arranged and controlled in one of the optical waveguides 32 1 or 32 2 , a 1 ⁇ 2 switching operation can be obtained.
  • the refractive indexes of the optical waveguides 32 1 and 32 2 may be changed.
  • the refractive index of the optical waveguide is changed using the FK effect or QCSE effect due to voltage application or the plasma effect due to current injection.
  • the optical waveguide is affected using the Pockels effect due to voltage application. If the refractive index is changed, a switching operation can be performed.
  • a directional coupler or the like may be used as the MMI optical coupler that divides the light intensity into two equal parts.
  • the extinction ratio is 20 dB or more and the applied voltage is ⁇ 7 V with respect to the light absorption gates 23 1 and 23 2 .
  • an extinction ratio of 40 dB or more can be obtained.
  • the input signal light is the light in FIG. Output to the output port PO 1 side.
  • the refractive index of the arm optical waveguide that is injected changes, and the phase of the propagating light changes.
  • the injection current into the arm optical waveguide is about 5 mA, the output from the optical output port PO 1 is minimum, and the optical output to the optical output port PO 2 is maximum. In this case, the ratio of the light output to the optical output and the optical output port PO 1 to the optical output port PO 1 are obtained at least 20 dB.
  • a 1 ⁇ J optical switch having a 1 ⁇ J port configuration includes a 1 ⁇ J optical coupler and J light absorption gates.
  • the MZI type optical switch not only the one-stage MZI type optical switch 30 but also a 2 ⁇ 2 MZI type optical switch 60 to be described later is connected in multiple stages in a tree shape, so that a large number of optical output ports can be connected. Switching is possible.
  • the input side of the rear 2 ⁇ 2 MZI optical switch 60 is connected to each of the two ports on the output side of the front 2 ⁇ 2 MZI optical switch 60. One of the two ports is connected.
  • an n-InP lower clad layer, a bulk i-InGaAsP core layer with a 1.4Q composition of 0.3 ⁇ m thickness, a p-InP upper clad layer, and a p + -InGaAs cap layer are formed on an n-InP substrate.
  • Grow by vapor phase growth method Metal Organic Vapor Phase Epitaxy: MOVPE.
  • an input optical waveguide having a high-mesa optical waveguide structure, a 1 ⁇ 2 optical coupler 21, optical waveguides 22 1 and 22 2 , light absorption gates 23 1 and 23 2 and an output optical waveguide are collectively formed by photolithography and dry etching.
  • BCB benzocyclobutene
  • O 2 / C 2 F 6 mixed gas is used.
  • Etching back is performed by RIE (Reactive Ion Etching) until the substrate surface before embedding (the uppermost surface of the substrate) is exposed, and the substrate surface is flattened.
  • a p-type electrode is formed on the light absorption gate 23 1, the light absorption gate 23 2 , and the p + -InGaAs cap layer of the 1 ⁇ 2 coupler 21, and the back surface of the n-InP substrate or the optical waveguide structure of the same substrate An n-type electrode is formed in a region where is not formed.
  • MOVPE growth and formation of an optical waveguide structure can be performed at once. Further, unlike the conventional optical switch element shown in FIG. 15, the n-InP upper cladding layer and the p + -InGaAs cap layer are removed between the 1 ⁇ 2 optical coupler 21 and the light absorption gates 23 1 and 23 2. The process to do becomes unnecessary. Therefore, it is possible to provide an optical switch that has a simple manufacturing method, does not deteriorate optical characteristics, and has extremely low optical crosstalk.
  • FIG. 5 shows a cross-sectional view of the optical waveguide structure.
  • reference numeral 41 denotes an n-InP substrate
  • reference numeral 42 denotes an n-InP lower cladding layer
  • reference numeral 43 denotes an InGaAsP core layer
  • reference numeral 44 denotes a p-InP upper cladding layer
  • reference numeral 45 denotes a p + -InGaAs cap layer.
  • an InGaAsP core layer 43 having a thickness of 0.3 ⁇ m and a width of 1.5 ⁇ m and a 1.4Q composition is used. These design values are important parameters that determine the optical characteristics of the optical switch.
  • the thickness of the InGaAsP core layer 43 is a single mode waveguide condition with respect to the input signal light, and a condition having sufficient light confinement in the InGaAsP core layer 43, and is 0.1 ⁇ m to 0. A range of 4 ⁇ m is desirable.
  • the width of the InGaAsP core layer 43 is a single mode waveguide condition for the input signal light, and is preferably in the range of 0.8 ⁇ m to 3 ⁇ m.
  • composition of the InGaAsP core layer 43 is 1.3Q to 1.5Q, and each electrode length is preferably in the range of 100 ⁇ m to 2000 ⁇ m in the case of EAM and 50 ⁇ m to 1000 ⁇ m in the case of MZI.
  • the bulk layer is used as the InGaAsP core layer 43 of the light absorption gates 23 1 and 23 2 , but an MQW structure may be used. In that case, quenching can be performed with high efficiency by the QCSE effect.
  • the optical waveguide structure is a high mesa optical waveguide structure, other structures such as a ridge type optical waveguide structure may be manufactured.
  • an embedded optical waveguide structure or a rib optical waveguide structure in which both sides of the InGaAsP core layer 43 are embedded with a semiconductor may be used.
  • optical switch in this embodiment has been described using an InP-based compound semiconductor
  • a GaAs-based compound semiconductor may be used.
  • the same can be realized by using a material system such as a silicon fine wire optical waveguide.
  • Optical waveguide structures using these materials can change the refractive index or absorption coefficient in the order of nanoseconds, and such high-speed changes enable high-speed switching of OCS optical signals and OPS optical signals.
  • the optical switch device according to the present invention is provided in a ROADM node device of a network that uses both an OCS optical signal and an OPS optical signal.
  • the ROADM node device has a WSS, and the optical switch device according to the present invention is arranged at a stage subsequent to the WSS of the node device.
  • FIG. 6 shows an optical switch device according to this embodiment.
  • an optical switch device having four optical input ports PI 1 to PI 4 and four optical output ports PO 1 to PO 4 is assumed to be capable of simultaneously transferring an OCS optical signal and an OPS optical signal. .
  • two 1 ⁇ 2 optical switches (hereinafter referred to as 1 ⁇ 2SW) 51 1 and 51 2 and a 2 ⁇ 1 optical switch (hereinafter referred to as 2 ⁇ 1SW) 52 1 , 52 2 (first optical switch unit), and for add / drop of an OPS optical signal, two 2 ⁇ 2 optical switches (hereinafter referred to as 2 ⁇ 2SW) 53 1 and 53 2 are used (first).
  • 2 optical switch section For add / drop between an OCS optical signal and an OPS optical signal, two 1 ⁇ 2SW) 51 1 and 51 2 and a 2 ⁇ 1 optical switch (hereinafter referred to as 2 ⁇ 1SW) 52 1 , 52 2 (first optical switch unit), and for add / drop of an OPS optical signal, two 2 ⁇ 2 optical switches (hereinafter referred to as 2 ⁇ 2SW) 53 1 and 53 2 are used (first). 2 optical switch section).
  • the optical input port PI 1 is connected to the input side of the 1 ⁇ 2 SW 51 1
  • the optical input port PI 2 is connected to the input side of the 1 ⁇ 2 SW 51 2
  • the optical input ports PI 3 and PI 4 are 2 ⁇ 2 SW 53 1. Is connected to the input side.
  • the optical output port PO 1 is connected to the output side of the 2 ⁇ 1 SW 52 1
  • the optical output port PO 2 is connected to the output side of the 2 ⁇ 1 SW 52 2
  • the optical output ports PO 3 and PO 4 are 2 ⁇ 2SW53 is connected to the second output side.
  • 1 one of the optical output port of ⁇ 2SW51 1 is the optical fiber 54 1 is connected to the 2 ⁇ 1SW52 1 of one of the optical input port, 1 ⁇ 2SW51 1 of the other light output port, the optical fiber 54 2 is connected to one optical input port of the 2 ⁇ 2 SW 53 2 .
  • 1 ⁇ 2SW51 2 of one of the optical output port, the optical fiber 543 is connected to the 2 ⁇ 1SW52 2 of one of the optical input port, 1 ⁇ 2SW51 2 of the other light output port, the optical fiber 54 4 is connected to the other optical input port of the 2 ⁇ 2 SW 53 2 .
  • the 2 ⁇ 2SW53 1 of one of the optical output port, the optical fiber 54 5 is connected to the 2 ⁇ 1SW52 1 of the other optical input port
  • the 2 ⁇ 2SW53 1 of the other light output port, the optical fiber the 54 6, are connected to the 2 ⁇ 1SW52 2 of the other optical input port.
  • each switching element is an individual chip or module, and these are connected by the optical fibers 54 1 to 54 6 .
  • 1 ⁇ 2 SWs and 2 ⁇ 1 SWs may be the same chip or module.
  • the operation speed can be increased. It is possible to switch between the OCS optical signal and the OPS optical signal.
  • the above 2 ⁇ 2 SW 53 1 and 53 2 adopt the MZI type optical switch 60 as shown in FIG. 7 and the 2 ⁇ 2 SW 70 as shown in FIG. 8 to enable high-speed OPS optical signal processing.
  • the MZI type optical switch 60 shown in FIG. 7 and the 2 ⁇ 2 SW 70 shown in FIG. 8 will be described below.
  • the MZI type optical switch 60 shown in FIG. 7 has a configuration in which the MZI type optical switch 30 shown in FIG. 2 is expanded to 2 ⁇ 2.
  • the MZI type optical switch 60 is a 2 ⁇ 2 light which is an MMI optical coupler in which optical input ports PI 1 and PI 2 are connected to the input side and optical waveguides 62 1 and 62 2 are connected to the output side.
  • the 2 ⁇ 2 SW 70 shown in FIG. 8 has a configuration in which distribution selection type optical switches 71 1 to 71 4 having the same configuration as the distribution selection type optical switch 20 shown in FIG. Specifically, the optical input port PI 1 is connected to the input side of the distribution selection type optical switch 71 1 , and the optical input port PI 2 is connected to the input side of the distribution selection type optical switch 71 2 . Further, the optical output port PO 1 is connected to the output side of the distributor selection optical switch 71 3, optical output port PO 2 is connected to the output side of the distributor selection optical switch 71 4.
  • one of the optical output port of broadcast-and-select optical switch 71 1 the optical waveguide 72 1 is connected to one of the optical input port of broadcast-and-select optical switch 71 3, other one of the distribution selective optical switch 71 1 the optical output port, the optical waveguide 72 2 is connected to one of the optical input port of broadcast-and-select optical switch 71 4.
  • one of the optical output port of broadcast-and-select optical switch 71 2, the optical waveguide 72 3 is connected to the other optical input port of broadcast-and-select optical switch 71 3, broadcast-and-select optical switch 71 2 Nomou one optical output port, the optical waveguide 72 4 is connected to the other optical input port of broadcast-and-select optical switch 71 4.
  • high-speed switching of the OPS optical signal is performed by 2 ⁇ 2 SWs 53 1 and 53 2 .
  • the label of the OPS optical signal is read immediately before 2 ⁇ 2 SW 53 1 and 2 ⁇ 2 SW 53 2 , and switching to a preset optical output port is performed based on the label table.
  • the optical switch device in the WSS-based ROADM node device, includes 1 ⁇ 2 SW 51 1 , 51 2 and 2 ⁇ 1 SW 52 1 , 52 2 dedicated for add / drop between the OCS optical signal and the OPS optical signal.
  • the high-speed optical switch described above is used for these. With such a configuration, it is possible to handle both the OCS optical signal and the OPS optical signal without giving any disadvantage to the OCS optical signal. Furthermore, by optimizing the number of ports of each optical switch and the connection of optical fibers to the network configuration, it is possible to establish a node technology that suppresses loss, which is a drawback of high-speed optical switches.
  • FIG. 9 shows an optical switch device according to this embodiment.
  • the optical switch device similarly to the optical switch device shown in the first embodiment, the optical switch device has four optical input ports PI 1 to PI 4 and four optical output ports PO 1 to PO 4 , and the OCS optical signal and the OPS light are used. It is assumed that signals can be transferred simultaneously.
  • two of 1 ⁇ 2 SW 51 1 , 51 2 and two of 2 ⁇ 1 SW 52 1 , 52 2 are used, and for add / drop of the OPS optical signal, 2 ⁇ Two 2SWs 53 1 and 53 2 are used.
  • the optical input ports PI 1 to PI 4 the optical output ports PO 1 to PO 4 , 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 , 2 ⁇ 2 SW 53 1 , 53 2 are described in the first embodiment.
  • the configuration is the same as that of the illustrated optical switch device, and therefore, the same reference numerals are given in FIG.
  • 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 are integrated on one chip as switching elements, and each switching element They are connected by an optical waveguide having a structure equivalent to that of the optical waveguide shown in FIG.
  • the optical waveguides 82 1 to 82 6 are monolithically integrated on the same chip substrate 81 together with 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 ,
  • the optical switches are connected by optical waveguides 82 1 to 82 6 .
  • the chip substrate 81 for example, the n-InP substrate shown in FIG. 5 may be adopted.
  • 1 one of the optical output port of ⁇ 2SW51 1 is the optical waveguide 82 1 is connected to the 2 ⁇ 1SW52 1 of one of the optical input port, the 1 ⁇ 2SW51 1 of the other optical output port,
  • the optical waveguide 82 2 is connected to one optical input port of the 2 ⁇ 2 SW 53 2 .
  • 1 ⁇ 2SW51 2 of one of the optical output port, the optical waveguide 82 3 is connected to the 2 ⁇ 1SW52 2 of one of the optical input port, 1 ⁇ 2SW51 2 of the other light output port, the optical waveguide 82 4 is connected to the other optical input port of the 2 ⁇ 2 SW 53 2 .
  • the 2 ⁇ 2SW53 1 of one of the optical output port, the optical waveguide 82 5, is connected to the 2 ⁇ 1SW52 1 of the other optical input port
  • the 2 ⁇ 2SW53 1 of the other light output port, the optical waveguide the 82 6, are connected to the 2 ⁇ 1SW52 2 of the other optical input port.
  • the distribution selection type optical switch 20 shown in FIG. 1 and the MZI type optical switch 30 shown in FIG. 2 for the above 1 ⁇ 2 SW 51 1 , 51 2 and 2 ⁇ 1 SW 52 1 , 52 2 as well, it is possible to increase the speed. It is possible to switch between the OCS optical signal and the OPS optical signal. Further, the above-described 2 ⁇ 2 SWs 53 1 and 53 2 also employ the MZI type optical switch 60 shown in FIG. 7 and the 2 ⁇ 2 SW 70 shown in FIG. 8 to enable high-speed OPS optical signal processing. .
  • the optical switches employed in the 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2, and 2 ⁇ 2 SW 53 1 , 53 2 are the same in the third to fifth embodiments described later.
  • the add / drop of the OPS optical signal can be realized on the same chip in addition to the add / drop of the OCS optical signal and the OPS optical signal. Miniaturization is possible. Further, regarding the connection loss with the optical fiber that is the loss source of the optical switch device, it is not necessary to connect the switching elements with the optical fiber, so that a reduction in loss can be expected.
  • high-speed switching of the OPS optical signal is performed by 2 ⁇ 2 SWs 53 1 and 53 2 . Specifically, at 2 ⁇ 2SW53 1 and 2 ⁇ 2SW53 2 just before reading the label of the OPS optical signal, performs switching on the basis of the label table.
  • the optical switch device in the WSS-based ROADM node device, includes 1 ⁇ 2 SW 51 1 , 51 2 and 2 ⁇ 1 SW 52 1 , 52 2 dedicated for add / drop between the OCS optical signal and the OPS optical signal.
  • the high-speed optical switch described above is used for these.
  • label information needs to be added, it is possible to handle both the OCS optical signal and the OPS optical signal without giving a disadvantage to the OCS optical signal.
  • by optimizing the number of ports of each optical switch and the connection of optical waveguides to the network configuration it is possible to establish a node technology that suppresses the loss that is a disadvantage of the high-speed optical switch.
  • FIG. 11 shows an optical switch device according to this embodiment.
  • the optical switch device similarly to the optical switch device shown in the first embodiment, the optical switch device has four optical input ports PI 1 to PI 4 and four optical output ports PO 1 to PO 4 , and the OCS optical signal and the OPS light are used. It is assumed that signals can be transferred simultaneously.
  • two of 1 ⁇ 2 SW 51 1 , 51 2 and two of 2 ⁇ 1 SW 52 1 , 52 2 are used, and for add / drop of the OPS optical signal, 2 ⁇ Two 2SWs 53 1 and 53 2 are used.
  • the optical input ports PI 1 to PI 4 the optical output ports PO 1 to PO 4 , 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 , 2 ⁇ 2 SW 53 1 , 53 2 are arranged. Except for this, the configuration is the same as that of the optical switch device shown in the first embodiment. Therefore, the same reference numerals are given in FIG.
  • 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 are integrated on one chip as switching elements, and each switching element They are connected by an optical waveguide having a structure equivalent to that of the optical waveguide shown in FIG.
  • the optical waveguides 84 1 to 84 6 are monolithically integrated on the same chip substrate 81 together with 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 ,
  • the optical switches are connected by optical waveguides 84 1 to 84 6 .
  • 1 one of the optical output port of ⁇ 2SW51 1 is the optical waveguide 84 1 is connected to the 2 ⁇ 1SW52 1 of one of the optical input port, the 1 ⁇ 2SW51 1 of the other optical output port,
  • the optical waveguide 84 2 is connected to one optical input port of the 2 ⁇ 2 SW 53 2 .
  • 1 ⁇ 2SW51 2 of one of the optical output port, the optical waveguide 84 3, is connected to the 2 ⁇ 1SW52 2 of one of the optical input port, 1 ⁇ 2SW51 2 of the other light output port, the optical waveguide 84 4 is connected to the other optical input port of the 2 ⁇ 2 SW 53 2 .
  • the 2 ⁇ 2SW53 1 of one of the optical output port, the optical waveguide 84 5 is connected to the 2 ⁇ 1SW52 1 of the other optical input port
  • the 2 ⁇ 2SW53 1 of the other light output port, the optical waveguide the 84 6, are connected to the 2 ⁇ 1SW52 2 of the other optical input port.
  • the 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 are connected to each other so that the optical waveguides 84 1 to 84 6 connecting them do not cross each other. Are arranged adjacent to each other.
  • 1 ⁇ 2SW51 1 and 2 ⁇ 2SW53 2 which are connected by the optical waveguide 84 2 are arranged adjacently
  • 2 ⁇ 2SW53 2 and 1 ⁇ 2SW51 2 which are connected by the optical waveguide 84 4 are arranged adjacent to each other
  • 2 ⁇ 1SW52 1 and 2 ⁇ 2SW53 1 connected by the optical waveguide 84 5 are arranged adjacent to each other
  • 2 ⁇ 2SW53 1 and 2 ⁇ 1SW52 2 connected by the optical waveguide 84 6 are arranged adjacent to each other.
  • the 1 ⁇ 2 SW 51 1 and the 2 ⁇ 1 SW 52 1 connected by the optical waveguide 84 1 are arranged at different ends, but it can be said that they are arranged adjacent to each other on the connection, and the optical waveguide 84 3. in even 1 ⁇ 2SW51 2 and 2 ⁇ 1SW52 2 to be connected are disposed on different ends from each other, connected on can be said to be disposed adjacent.
  • the arrangement of the optical input ports PI 1 to PI 4 and the optical output ports PO 1 to PO 4 is different from that of the second embodiment.
  • the optical input ports PI 1 to PI 4 are arranged at one end and the optical output ports PO 1 to PO 4 are arranged at the other end.
  • optical input ports PI 1 and PI 2 and optical output ports PO 3 and PO 4 are disposed at one end, and optical input ports PI 3 and PI 4 and optical are disposed at the other end.
  • Output ports PO 1 and PO 2 are arranged.
  • the add / drop of the OPS optical signal can be realized on the same chip. Miniaturization is possible. Further, regarding the connection loss with the optical fiber that is the loss source of the optical switch device, it is not necessary to connect the switching elements with the optical fiber, so that a reduction in loss can be expected.
  • the optical switch apparatus shown in Example 2 using the optical waveguide 82 1-82 6 on the chip substrate 81, for connecting the respective switching element, intersection is generated in a part of the optical waveguide
  • the intersection of the optical waveguides is eliminated by changing the arrangement of the optical input / output ports and the switching elements. In general, loss of light intensity and crosstalk to other ports occur at the intersections of the optical waveguides. Therefore, in this embodiment, it is possible to suppress deterioration of signal characteristics.
  • FIG. 12 shows an optical switch device according to this embodiment.
  • the optical switch device similarly to the optical switch device shown in the first embodiment, the optical switch device has four optical input ports PI 1 to PI 4 and four optical output ports PO 1 to PO 4 , and the OCS optical signal and the OPS light are used. It is assumed that signals can be transferred simultaneously.
  • two of 1 ⁇ 2 SW 51 1 , 51 2 and two of 2 ⁇ 1 SW 52 1 , 52 2 are used, and for add / drop of the OPS optical signal, 2 ⁇ Two 2SWs 53 1 and 53 2 are used.
  • the optical input ports PI 1 to PI 4 the optical output ports PO 1 to PO 4 , 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 , 2 ⁇ 2 SW 53 1 , 53 2 are arranged. Except for this, the configuration is the same as that of the optical switch device shown in the first embodiment. Therefore, the same reference numerals are given in FIG.
  • 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 are integrated on one chip as switching elements, and each switching element They are connected by an optical waveguide having a structure equivalent to that of the optical waveguide shown in FIG.
  • optical waveguides 85 1 to 85 6 are monolithically integrated on the same chip substrate 81 together with 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 ,
  • the optical switches are connected by optical waveguides 85 1 to 85 6 .
  • 1 one of the optical output port of ⁇ 2SW51 1 is the optical waveguide 85 1 is connected to the 2 ⁇ 1SW52 1 of one of the optical input port, the 1 ⁇ 2SW51 1 of the other optical output port,
  • the optical waveguide 85 2 is connected to one optical input port of the 2 ⁇ 2 SW 53 2 .
  • the 1 ⁇ 2SW51 one optical output port of the 2, the optical waveguide 85 3, is connected to the 2 ⁇ 1SW52 2 of one of the optical input port, 1 ⁇ 2SW51 2 of the other light output port, the optical waveguide 85 4 is connected to the other optical input port of the 2 ⁇ 2 SW 53 2 .
  • the 2 ⁇ 2SW53 1 of one of the optical output port, the optical waveguide 85 5 is connected to the 2 ⁇ 1SW52 1 of the other optical input port
  • the 2 ⁇ 2SW53 1 of the other light output port, the optical waveguide the 85 6, are connected to the 2 ⁇ 1SW52 2 of the other optical input port.
  • the 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 are arranged so that all of the optical input ports PI 1 to PI 4 and the optical output ports PO 1 to PO 4 are arranged at one end of the chip substrate 81. , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 are arranged.
  • the arrangement of the optical input ports PI 1 to PI 4 and the optical output ports PO 1 to PO 4 is different from those in the second and third embodiments.
  • the optical input ports PI 1 to PI 4 are arranged at one end, and the optical output ports PO 1 to PO 4 are arranged at the other end.
  • the optical input ports PI 1 and PI 2 and the optical output ports PO 3 and PO 4 are disposed at one end, and the optical input ports PI 3 and PI 4 and the optical output ports PO 1 and PO 2 are disposed at the other end.
  • the optical input ports PI 1 to PI 4 and the optical output ports PO 1 to PO 4 are all arranged at one end.
  • the add / drop of the OPS optical signal can be realized on the same chip. Miniaturization is possible. Further, regarding the connection loss with the optical fiber that is the loss source of the optical switch device, it is not necessary to connect the switching elements with the optical fiber, so that a reduction in loss can be expected.
  • the optical input / output port of the optical switch device is arranged on one side of the chip, so that it can be easily modularized.
  • FIG. 13 shows an optical switch device according to this embodiment.
  • the optical switch device similarly to the optical switch device shown in the first embodiment, the optical switch device has four optical input ports PI 1 to PI 4 and four optical output ports PO 1 to PO 4 , and the OCS optical signal and the OPS light are used. It is assumed that signals can be transferred simultaneously.
  • two of 1 ⁇ 2 SW 51 1 , 51 2 and two of 2 ⁇ 1 SW 52 1 , 52 2 are used, and for add / drop of the OPS optical signal, 2 ⁇ Two 2SWs 53 1 and 53 2 are used.
  • the optical input ports PI 1 to PI 4 the optical output ports PO 1 to PO 4 , 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 , 2 ⁇ 2 SW 53 1 , 53 2 are arranged. Except for this, the configuration is the same as that of the optical switch device shown in the first embodiment. Therefore, the same reference numerals are given in FIG.
  • 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 are integrated on one chip as switching elements, and each switching element They are connected by an optical waveguide having a structure equivalent to that of the optical waveguide shown in FIG.
  • the optical waveguides 86 1 to 86 6 are monolithically integrated on the same chip substrate 81 together with 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 ,
  • the optical switches are connected by optical waveguides 86 1 to 86 6 .
  • 1 one of the optical output port of ⁇ 2SW51 1 is the optical waveguide 86 1 is connected to the 2 ⁇ 1SW52 1 of one of the optical input port, the 1 ⁇ 2SW51 1 of the other optical output port,
  • the optical waveguide 86 2 is connected to one optical input port of the 2 ⁇ 2 SW 53 2 .
  • 1 ⁇ 2SW51 2 of one of the optical output port, the optical waveguide 86 3 is connected to the 2 ⁇ 1SW52 2 of one of the optical input port, 1 ⁇ 2SW51 2 of the other light output port, the optical waveguide 86 4 is connected to the other optical input port of the 2 ⁇ 2 SW 53 2 .
  • the 2 ⁇ 2SW53 1 of one of the optical output port, the optical waveguide 86 5 is connected to the 2 ⁇ 1SW52 1 of the other optical input port
  • the 2 ⁇ 2SW53 1 of the other light output port, the optical waveguide the 86 6, are connected to the 2 ⁇ 1SW52 2 of the other optical input port.
  • the 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 , 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 are connected to each other so that the optical waveguides 84 1 to 84 6 connecting them do not cross each other. Are arranged adjacent to each other.
  • the 1 ⁇ 2 SW 51 1 , 51 2 , 2 ⁇ 1 SW 52 1 are arranged so that all of the optical input ports PI 1 to PI 4 and the optical output ports PO 1 to PO 4 are arranged at one end of the chip substrate 81.
  • 52 2 and 2 ⁇ 2 SW 53 1 , 53 2 are arranged.
  • the end of one side of the chip substrate 81, 1 ⁇ 2SW51 1 and 2 ⁇ 2SW53 2 which are connected by optical waveguides 862 are arranged adjacent, and 2 ⁇ 2SW53 2 which are connected by the optical waveguide 86 4 1 ⁇ 2SW51 2 are arranged adjacent, 1 ⁇ 2SW51 2 and 2 ⁇ 1SW52 2 are arranged adjacently, 2 ⁇ 1SW52 2 and 2 ⁇ connected by optical waveguides 86 6 connected by optical waveguides 86 3 2SW53 1 are arranged adjacently, 2 ⁇ 2SW53 1 and 2 ⁇ 1SW52 1 connected by optical waveguides 86 5 are arranged adjacent.
  • the 1 ⁇ 2 SW 51 1 and the 2 ⁇ 1 SW 52 2 connected by the optical waveguide 86 1 are arranged at both ends of one end portion of the chip substrate 81, but it can be said that they are arranged adjacent to each other on the connection. .
  • the arrangement of the optical input ports PI 1 to PI 4 and the optical output ports PO 1 to PO 4 is different from those in the second and third embodiments.
  • the optical input ports PI 1 to PI 4 are arranged at one end, and the optical output ports PO 1 to PO 4 are arranged at the other end.
  • the optical input ports PI 1 and PI 2 and the optical output ports PO 3 and PO 4 are disposed at one end, and the optical input ports PI 3 and PI 4 and the optical output ports PO 1 and PO 2 are disposed at the other end.
  • the optical input ports PI 1 to PI 4 and the optical output ports PO 1 to PO 4 are all arranged at one end.
  • the add / drop of the OPS optical signal can be realized on the same chip. Miniaturization is possible. Further, regarding the connection loss with the optical fiber that is the loss source of the optical switch device, it is not necessary to connect the switching elements with the optical fiber, so that a reduction in loss can be expected.
  • the optical input / output port of the optical switch device is arranged on one side of the chip, so that it can be easily modularized.
  • the switching elements are connected to each other using the optical waveguides 85 1 to 85 6 on the chip substrate 81, a crossing portion is generated in some of the optical waveguides.
  • the intersection of the optical waveguides is eliminated by changing the arrangement of the optical input / output ports and the switching elements. In general, loss of light intensity and crosstalk to other ports occur at the intersections of the optical waveguides. Therefore, in this embodiment, it is possible to suppress deterioration of signal characteristics.
  • Example 6 In the present embodiment, modified examples of the first to fifth embodiments will be described. In the first to fifth embodiments described above, a mode with a small number of optical input / output ports is shown for the sake of simplicity of description. is there. Therefore, the configuration of the optical switch device having a large number of optical input / output ports will be described with reference to FIG. 14, taking the optical switch device shown in FIG. 6 of Embodiment 1 as an example.
  • each of K, L, M, and N is an integer of 1 or more
  • the optical input / output port of the optical switch for adding / dropping the OCS optical signal and the OPS optical signal is an N port
  • the optical switch for adding / dropping the OPS optical signal The input / output port is M port
  • the optical input / output port between optical switches for cut-through of OCS optical signals is L port
  • the optical input / output port between optical switches for add / drop of OPS optical signals is K Port.
  • the optical switch for adding / dropping the OCS optical signal and the OPS optical signal includes N ⁇ (K + L) SW 91 and (K + L) ⁇ N port configurations having an N ⁇ (K + L) port configuration.
  • the optical switch for adding and dropping the OPS optical signal may be M ⁇ KSW 93 having an M ⁇ K port configuration and K ⁇ MSW 94 having a K ⁇ M port configuration.
  • the N ⁇ (K + L) SW 91 has optical input ports PI1 1 to PI1 N , optical output ports PMO1 1 to PMO1 L, and optical output ports PMO2 1 to PMO2 K
  • (K + L) ⁇ NSW 92 is an optical input port.
  • PMI1 1 to PMI1 L and optical input ports PMI2 1 to PMI2 K and optical output ports PO1 1 to PO1 N are included.
  • the M ⁇ KSW 93 includes optical input ports PI2 1 to PI2 M and optical output ports PMO3 1 to PMO3 K.
  • the K ⁇ MSW 94 has optical input ports PMI3 1 to PMI3 K and optical output ports PO2 1 to PO2 M.
  • the N ⁇ (K + L) SW91 optical output ports PMO1 1 ⁇ PMO1 L, (K + L) is connected to the optical input port PMI 1 1 ⁇ PMI 1 L of ⁇ NSW92, N ⁇ (K + L) SW91 optical output ports pMO2 1 ⁇ the pMO2 K, connects to the optical input port PMI3 1 ⁇ PMI3 K of K ⁇ MSW94, an optical output port pMO3 1 ⁇ pMO3 K of M ⁇ KSW93, connected to the (K + L) optical input port PMI2 1 ⁇ PMI2 K of ⁇ NSW92 doing.
  • Such N ⁇ (K + L) SW 91, (K + L) ⁇ NSW 92, M ⁇ KSW 93, and K ⁇ MSW 94 each have at least one 1 ⁇ J using the above-described 1 ⁇ J distribution selection type optical switch as a basic component. It consists of a distribution selection type optical switch. Alternatively, one 1 ⁇ 2 MZI optical switch 30 having the 1 ⁇ J MZI optical switch 30 described above or a 1 ⁇ J optical switch composed of a plurality of 2 ⁇ 2 MZI optical switches 60 as basic components. Alternatively, it is composed of at least one 1 ⁇ J optical switch.
  • N ⁇ (K + L) SW 91 and (K + L) ⁇ NSW 92 optical input / output ports for adding and dropping OCS optical signals and OPS optical signals are N ports.
  • N optical switches may be used with a single port.
  • the optical output port for add / drop of the OPS optical signal is set so that the total number of optical output ports for cut-through of the OCS optical signal becomes L port.
  • the OPS optical signal must be set so that the total number of optical input ports for cut-through of the OCS optical signal is L ports in the N optical switches on the output side. It is necessary to make the total number of add-drop optical input ports equal to K ports.
  • the optical switch device shown in the first embodiment can be applied to a form having a large number of optical input / output ports.
  • the configuration of the second embodiment is substantially the same as that of the first embodiment, and the configurations of the optical input / output ports and the switching elements are different from those of the third to fifth embodiments.
  • the configuration is the same as that of the first embodiment. Therefore, the modification described with reference to FIG. 14 is also applicable to the second to fifth embodiments.
  • the present invention is suitable for an optical switch device for a node device of a large-capacity optical communication network.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Nonlinear Science (AREA)
  • Computing Systems (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Optical Communication System (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

L'invention concerne un dispositif de commutation optique à faible perte destiné à réaliser un dispositif de noeud qui transfère un signal optique d'un système d'échange de ligne optique et un signal optique d'un système d'échange de paquet optique. Le dispositif de commutation optique est disposé dans un dispositif de noeud constituant un réseau et comprend des ports d'entrée optique PI1 à PI4 et des ports de sortie optique PO1 à PO4. Le dispositif de commutation optique comprend 1 × 2 commutateurs optiques 511, 512, 2 × 1 commutateurs optiques 521, 522, et 2 x 2 commutateurs optiques 531, 532. Les commutateurs optiques comprennent un guide d'ondes optiques d'un matériau dont l'indice de réfraction ou le coefficient d'absorption varie de l'ordre de nanosecondes. L'indice de réfraction ou le coefficient d'absorption est changé afin d'effectuer ainsi une commutation à la fois d'un signal optique OCS du système d'échange de ligne optique et d'un signal optique OPS du système d'échange de paquet optique.
PCT/JP2019/021829 2018-06-08 2019-05-31 Dispositif de commutation optique Ceased WO2019235392A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024038542A1 (fr) * 2022-08-18 2024-02-22 Nippon Telegraph And Telephone Corporation Commutateur optique et système de commutation
US20250088776A1 (en) * 2023-09-08 2025-03-13 Nokia Solutions And Networks Oy Optical node architectures for optical communication systems

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Publication number Priority date Publication date Assignee Title
JPH08211427A (ja) * 1995-02-08 1996-08-20 Nippon Telegr & Teleph Corp <Ntt> 光マルチプレクサ・デマルチプレクサ
JP2007148042A (ja) * 2005-11-28 2007-06-14 Nippon Telegr & Teleph Corp <Ntt> 波長選択光スイッチ、光合流器、光分岐器および波長選択光スイッチモジュール
JP2016152522A (ja) * 2015-02-18 2016-08-22 日本電信電話株式会社 仮想光回線交換方式

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Publication number Priority date Publication date Assignee Title
JPH08211427A (ja) * 1995-02-08 1996-08-20 Nippon Telegr & Teleph Corp <Ntt> 光マルチプレクサ・デマルチプレクサ
JP2007148042A (ja) * 2005-11-28 2007-06-14 Nippon Telegr & Teleph Corp <Ntt> 波長選択光スイッチ、光合流器、光分岐器および波長選択光スイッチモジュール
JP2016152522A (ja) * 2015-02-18 2016-08-22 日本電信電話株式会社 仮想光回線交換方式

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024038542A1 (fr) * 2022-08-18 2024-02-22 Nippon Telegraph And Telephone Corporation Commutateur optique et système de commutation
JP2025527346A (ja) * 2022-08-18 2025-08-20 Ｎｔｔ株式会社 光スイッチおよびスイッチングシステム
US20250088776A1 (en) * 2023-09-08 2025-03-13 Nokia Solutions And Networks Oy Optical node architectures for optical communication systems

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