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WO2018161428A1 - Dispositif de régénération d'un signal pam optique contrôlé par voie optique - Google Patents

Dispositif de régénération d'un signal pam optique contrôlé par voie optique Download PDF

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Publication number
WO2018161428A1
WO2018161428A1 PCT/CN2017/083697 CN2017083697W WO2018161428A1 WO 2018161428 A1 WO2018161428 A1 WO 2018161428A1 CN 2017083697 W CN2017083697 W CN 2017083697W WO 2018161428 A1 WO2018161428 A1 WO 2018161428A1
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WO
WIPO (PCT)
Prior art keywords
optical
pam
signal
nonlinear
optical clock
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Ceased
Application number
PCT/CN2017/083697
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English (en)
Chinese (zh)
Inventor
蒋尚龙
武保剑
文峰
邱昆
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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Publication of WO2018161428A1 publication Critical patent/WO2018161428A1/fr
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    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • 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
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/54—Intensity modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers

Definitions

  • the invention belongs to the technical field of optical information processing, and more particularly to a light control optical PAM signal regeneration device.
  • optical signals are affected by factors such as fiber dispersion, fiber nonlinear effects, ASE noise accumulation of optical amplifiers, and interaction between channels, which leads to degradation of optical signals and ultimately limits systems and networks. Transmission rate and distance. Therefore, it is necessary to perform a regeneration process on the degraded signal.
  • the traditional photoelectric light regeneration method is quite mature, it is difficult to meet the increasing demand for higher-speed data transmission due to the existence of an "electronic bottleneck".
  • the all-optical regeneration technology of light-controlled light is considered to be the ultimate goal to solve this problem.
  • the object of the present invention is to overcome the deficiencies of the prior art and provide a photo-controlled optical PAM signal reproducing device.
  • the re-shaping process of the degraded optical PAM signal is used to obtain a high-quality optical PAM signal after regeneration, which has a simple structure and regenerative power.
  • the present invention provides a light control optical PAM signal regeneration apparatus, comprising: a power adaptation unit, an optical clock control unit, and a PAM shaping unit;
  • the power adaptation unit amplifies the input degradation light PAM signal, adjusts the level of the degradation light PAM signal to a normal operating point of the PAM shaping unit, and then inputs the signal to the PAM shaping unit;
  • the optical clock control unit includes an optical clock signal generating module, a tunable fiber delay line, and an amplifier; wherein the optical clock signal generating module further includes a laser light source and an amplitude modulator;
  • the laser light source outputs continuous light to the amplitude modulator, and then uses the electric clock signal to drive the amplitude modulator, so that the amplitude modulator outputs the optical clock signal, and the optical clock signal is amplified by the amplifier and input to the adjustable fiber delay line, and is delayed by the adjustable fiber.
  • the line adjusts the time delay of the optical clock signal to synchronize with the degraded optical PAM signal input into the high nonlinear optical fiber ring, and finally couples the synchronized optical clock signal into the highly nonlinear optical fiber ring;
  • the PAM shaping unit comprises a Mach-Zehnder interferometer and a high nonlinear fiber ring;
  • the Mach-Zehnder interferometer is composed of a coupler C1 and a coupler C2 connected in tandem, and the upper arm of the Mach-Zehnder interferometer is connected in series.
  • the coupler C1 After receiving the degraded light PAM signal output by the power matching unit, the coupler C1 divides it into upper and lower paths, wherein the upper path light is input to the high nonlinear fiber ring through the optical isolator, and is in the high nonlinear fiber ring.
  • the optical clock signal from the optical clock control unit has a nonlinear effect, producing a nonlinear phase-shifted optical signal that varies with input power; the downstream light passes through the phase shifter to produce a fixed phase shift that is independent of the input power.
  • the optical signal; the upper and lower optical signals are coupled into the coupler C2, and two-beam interference occurs, and the regenerated optical PAM signal is coupled and output.
  • the invention relates to a light control optical PAM signal regeneration device, comprising a power adaptation unit, an optical clock control unit and a PAM shaping unit; wherein the PAM shaping unit is the core of the regenerator, the Mach-Zehnder interferometer MZI and the high nonlinearity
  • the optical fiber ring NOLM is composed of a degraded optical PAM signal that needs to be regenerated.
  • the level matching between the input degraded optical PAM signal and the PAM shaping unit is completed by the power adaptation unit, and then the optical clock signal power output timing of the optical clock control unit is adjusted.
  • the phase shifter in the extension and MZI structure enables the PAM shaping unit to work normally.
  • the PAM shaping unit of different levels is used to complete the regeneration of the degraded optical PAM signal; thus, the present invention can perform the reshaping and retiming functions, and has the advantage that the number of reproduction levels can be flexibly designed.
  • FIG. 1 is a structural diagram of a light control optical PAM signal reproducing apparatus of the present invention
  • FIG. 2 is a structural diagram of an optical clock light control unit
  • FIG. 3 is a waveform diagram of an input deteriorated PAM signal
  • Figure 4 is a waveform diagram of a clock control signal
  • Figure 5 is a waveform diagram of the output reproduced PAM signal
  • PAM Pulse Amplitude Modulation
  • NOLM Nonlinear fiber loop mirror
  • MZI Machine-Zehnder interferometer
  • Mach-Zehnder interferometer Mach-Zehnder interferometer
  • Figure 1 is a block diagram showing the construction of a light control optical PAM signal reproducing apparatus.
  • a light control optical PAM signal regeneration apparatus includes: a power adaptation unit, an optical clock control unit, and a PAM shaping unit;
  • the power adapting unit amplifies the input degraded light PAM signal, adjusts the level of the degraded optical PAM signal to a normal operating point of the PAM shaping unit, and then inputs the signal to the PAM shaping unit;
  • the optical clock control unit includes an optical clock signal generating module, an amplifier, and a tunable fiber delay line; wherein the optical clock signal generating module further includes a laser light source and an amplitude modulator;
  • the laser light source outputs continuous light to the amplitude modulator, and then uses the electric clock signal to drive the amplitude modulator, so that the amplitude modulator outputs the optical clock signal, and the optical clock signal is amplified by the amplifier and input to the adjustable fiber delay line, and is delayed by the adjustable fiber.
  • the line adjusts the time delay of the optical clock signal to synchronize with the degraded light PAM signal input to the NOLM, and finally couples the synchronized optical clock signal into the NOLM;
  • a wavelength division multiplexer may be added between the optical clock control unit and the high nonlinear optical fiber ring, and the synchronized optical clock signal is coupled to the high nonlinear optical fiber ring by the wavelength division multiplexer;
  • the power level of the optical clock control unit to generate the optical clock signal depends on the nonlinear coefficient of the highly nonlinear fiber in the NOLM structure and its length;
  • the output signal of the optical clock control unit is used to control the NOLM structure, and the regeneration function of the optical PAM signal can be realized by appropriately adjusting the power and delay of the optical clock signal output by the optical clock control unit;
  • the PAM shaping unit comprises a Mach-Zehnder interferometer MZI and a highly nonlinear fiber optic ring NOLM;
  • the MZI is composed of a coupler C1 and a coupler C2 connected in tandem, and an optical isolator and a NOLM are sequentially connected in series on the upper arm of the MZI, and the lower arm thereof Connecting a phase shifter in series; the shaping function of the PAM shaping unit needs to be used in conjunction with the optical clock control unit;
  • the coupler C1 After receiving the degraded light PAM signal output by the power matching unit, the coupler C1 divides it into upper and lower paths, wherein the upper path light is input to the NOLM through the optical isolator, and the light in the NOLM and the optical clock control unit
  • the clock signal has a nonlinear effect, producing a nonlinear phase-shifted optical signal that varies with input power; the downstream light passes through the phase shifter to produce an optical signal that does not depend on the fixed phase shift of the input power; the upper and lower two
  • the path light signal is coupled into the coupler C2 and double beam interference occurs, coupling out the outputted light PAM signal.
  • the input degraded light PAM signal be as shown in Fig. 3, which satisfies: the symbol rate is 10G baud, the duty ratio is 0.5, and the power of each level is 0.375W, 0.625W, 0.875W, 1.125W, and the average normalization.
  • the structure of the PAM shaping unit is the structure shown in FIG. 1.
  • the PAM shaping unit can perform a shaping function on four level-degraded optical PAM signals having powers of 0.75 W, 1.25 W, 1.75 W, and 2.25 W, respectively.
  • the structure of the optical clock control unit is the structure shown in FIG. 2.
  • the optical clock signal output by the optical clock control unit is a periodic RZ square wave pulse signal, as shown in FIG. 4, in order to enable the PAM shaping unit to perform
  • the peak power of the optical clock control signal pulse output by the optical clock control unit should be set to 0.353 W and the duty ratio is equal to 0.5.
  • the four levels of the degraded optical PAM signal 0.375W, 0.625W, 0.875W, and 1.125W, can be amplified to the input level of the PAM shaping unit by 0.75 W, 1.25 W, 1.75W and 2.25W, thereby performing a reproduction function of the degraded light PAM signal.
  • the specific execution flow of the regenerative function is as follows: the degraded optical PAM signals with input levels of 0.375 W, 0.625 W, 0.875 W, and 1.125 W, respectively, are first passed.
  • the optical clock signal is coupled to the NOLM through a wavelength division multiplexer, wherein the optical clock signal is an RZ square wave pulse having a peak power equal to 0.353 W and a duty ratio equal to 0.5; the downstream light passes through the phase shifter to generate an independent The fixed phase of the input power is shifted by 3 ⁇ /2; finally, the two lights are double-beam interfered in the coupler C2, and the regenerated optical PAM signal is coupled and output, as shown in Fig. 5, which can be seen from the waveform diagram in Fig. 5. Out, every Noise level to give different degrees of inhibition; the same time, since the light output from the clock control unit are optical clock signal, under the control of the optically controlled optical reproducing apparatus PAM signal output from the reproduction signal is also retimed process.
  • the optical clock signal is an RZ square wave pulse having a peak power equal to 0.353 W and a duty ratio equal to 0.5; the downstream light passes through the phase shifter to generate an independent The fixed phase of the input power is shifted by 3 ⁇ /2;

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

L'invention concerne un dispositif de régénération d'un signal PAM optique contrôlé par voie optique, comprenant une unité d'adaptation de puissance, une unité de commande d'horloge optique, et une unité de remodelage de PAM. L'unité de remodelage de PAM est le coeur d'un régénérateur, et comprend un interféromètre de Mach-Zehnder (MZI), et un miroir à boucle optique non linéaire (NOLM). Lorsqu'un signal PAM optique dégradé doit être régénéré, l'unité d'adaptation de puissance exécute tout d'abord une adaptation de niveau entre le signal PAM optique dégradé entré et l'unité de remodelage PAM, puis ajuste une puissance de signal d'horloge optique et une sortie de retard au moyen de l'unité de commande d'horloge optique et d'un déphaseur dans la structure d'interféromètre de Mach-Zehnder (MZI), de sorte que l'unité de remodelage de PAM fonctionne normalement. En modifiant des paramètres tels que des coefficients de perte, des longueurs de fibre et des coefficients non linéaires du miroir à boucle optique non linéaire (NOLM), et des coefficients de couplage de coupleurs avant et arrière (C1, C2) dans la structure d'interféromètre de Mach-Zehnder (MZI), des unités de remodelage de PAM ayant différents niveaux sont conçues, achevant ainsi la régénération du signal PAM optique dégradé. Le dispositif selon l'invention peut exécuter des fonctions de remodelage et de resynchronisation, et le nombre de niveaux de régénération peut être configuré de manière flexible.
PCT/CN2017/083697 2017-03-10 2017-05-10 Dispositif de régénération d'un signal pam optique contrôlé par voie optique Ceased WO2018161428A1 (fr)

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CN201710142220.1A CN106972890B (zh) 2017-03-10 2017-03-10 一种光控光pam信号再生装置
CN201710142220.1 2017-03-10

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Families Citing this family (10)

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Publication number Priority date Publication date Assignee Title
CN107579777B (zh) * 2017-08-14 2019-09-24 电子科技大学 一种全光再生器自适应装置
CN108075832B (zh) * 2017-12-14 2020-03-24 电子科技大学 一种pam信号全光再生的装置及方法
CN108599855B (zh) * 2018-03-15 2020-12-01 电子科技大学 一种灵活可调的多电平全光2r再生装置
CN108768512B (zh) * 2018-04-27 2020-10-16 电子科技大学 一种测定全光pam再生器工作点系统及方法
CN108616310B (zh) * 2018-04-27 2020-07-21 中国科学院半导体研究所 基于马赫增德尔调制器进行四级脉冲幅度调制的方法
CN109004985B (zh) * 2018-07-24 2021-03-30 电子科技大学 一种反射式mzi结构的全光pam再生器
CN109586794B (zh) * 2018-11-16 2021-08-31 武汉光迅科技股份有限公司 一种双mzi多电平pam信号全光整形器及其设计方法
CN110277610A (zh) * 2019-06-25 2019-09-24 太原师范学院 一种基于高非线性光纤环的可调宽带光子射频移相器
CN110365417B (zh) * 2019-06-27 2021-12-10 电子科技大学 一种矩形星座qam信号全光再生装置
CN112564809B (zh) * 2021-02-22 2021-05-11 南京信息工程大学 一种基于环路合并的少模全光再生装置及方法

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