CN109407237A

CN109407237A - A kind of single-core fiber bidirectional optical coupler

Info

Publication number: CN109407237A
Application number: CN201811635174.XA
Authority: CN
Inventors: 刘向宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2019-03-01

Abstract

The invention discloses a kind of single-core fiber bidirectional optical couplers, including optical fiber, in " fore-telling " font or section optical device, light emitting diode and photodiode in a rectangular trapezoid；Optical device includes a upper end, a lower left end portion and bottom right end, and upper end and bottom right end are in vertical linear；Optical fiber is placed in the upper end of optical device, and light emitting diode and photodiode are respectively placed in the underface of lower left end portion and bottom right end.The photo-coupler, optical device makes rectangular triangle between light emitting diode, photodiode and optical fiber, and incident light is directly vertically mapped on photodiode by optical fiber and optical device.In this way, light emitting diode and photodiode separate design, eliminate the photosensitive area that light emitting diode occupies photodiode, improve the service efficiency of incident light；Meanwhile so that encapsulation operation becomes simpler.

Description

A kind of single-core fiber bidirectional optical coupler

Technical field

The present invention relates to photo-coupler more particularly to a kind of single-core fiber bidirectional optical couplers.

Background technique

It in optical communication field, converts optical signal into electric signal or converts electrical signals to optical signal, generally use photoelectricity Converter.Photoelectric converter common at this stage is uni-core bidirectional photo-coupler, including plastic optical fiber (Plastic optical Fiber, abbreviation POF), light emitting diode (LED) and photodiode (Photodiode, abbreviation PD), structure such as Fig. 1 and Shown in 2.In Fig. 1, the tri- structure fronts POF, LED, PD are successively vertically coaxially disposed；In Fig. 2, PD and LED is arranged laterally side by side It is placed in again below POF afterwards.However, former uni-core bidirectional photo-coupler, LED occupy the photosensitive area of part PD, reduce into The efficiency of light is penetrated, encapsulation is complicated；The working efficiency of latter uni-core bidirectional photo-coupler LED and PD are all not high enough.

Summary of the invention

Based on the above issues, the problem to be solved by the present invention is that providing that a kind of light receiving efficiency is high, encapsulation is simple, and LED is not take up the single-core fiber bidirectional optical coupler of PD photosensitive area.

Technical scheme is as follows:

A kind of single-core fiber bidirectional optical coupler, including optical fiber, in the optical device of " fore-telling " font, light emitting diode and Photodiode；The optical device include a upper end, a lower left end portion and bottom right end, the upper end with Place axis between the end of bottom right is in vertical linear setting, the axis between the lower left end portion, upper end and bottom right end Wire clamp angle is 0.5 °~20 °；The optical fiber is placed in the upper end of the optical device, and the light emitting diode is placed in the lower-left The underface of end, the photodiode are placed in the underface of bottom right end, and horizontal plane and upper end where photodiode Place axis perpendicular between portion and bottom right end.

A kind of single-core fiber bidirectional optical coupler, including optical fiber, section optical device in a rectangular trapezoid, light emitting diode And photodiode；The optical device includes a upper end, a lower left end portion and bottom right end, the upper end Portion and bottom right end in vertical linear, the axis angle between the lower left end portion, upper end and bottom right end is 0.5 °~ 20°；The optical fiber is placed in the upper end of the optical device, and the light emitting diode is placed in the underface of lower left end portion, described Photodiode is placed in the underface of the bottom right end of the optical device, and horizontal plane and upper end where photodiode and Place axis perpendicular between the end of bottom right.

The single-core fiber bidirectional optical coupler, wherein the axis between the lower left end portion, upper end and bottom right end Wire clamp angle is 5 °.

The single-core fiber bidirectional optical coupler, wherein incident ray by the optical fiber, optical device upper end and Bottom right end is directly vertically injected on photodiode.

The single-core fiber bidirectional optical coupler, wherein the lower left end portion of the light emitting diode and optical device it Between be equipped with transmitting optical lens.

The single-core fiber bidirectional optical coupler, wherein the bottom right end of the photodiode and optical device it Between be equipped with incident optical lens.

The single-core fiber bidirectional optical coupler, wherein the optical device is quartz glass prism, organic glass rib Mirror, transparent organic resin prism, the glass or organic glass prism for filling transparency liquid or gas medium, vacuum glass or organic Glass prism.

Single-core fiber bidirectional optical coupler of the present invention, since optical device can be several by the reception light after optical fiber total diffuse reflection It all projects on photodiode (PD), the transmitting light that light emitting diode (LED) can again issued is with 0.5~20 ° Angle directive optical fiber, and gone out by fibre optical transmission.In this way, LED and PD separate design, eliminate the photosensitive area that LED occupies PD, Improve the efficiency of PD incident light；Simultaneously as LED and PD separate design, so that encapsulation operation becomes more simply, conveniently.

Detailed description of the invention

Fig. 1 is a kind of existing uni-core bidirectional photo-coupler structural schematic diagram；

Fig. 2 is existing another uni-core bidirectional photo-coupler structural schematic diagram；

Fig. 3 is one embodiment of the invention single-core fiber bidirectional optical coupler structural schematic diagram；

Fig. 4 is another embodiment of the present invention single-core fiber bidirectional optical coupler structural schematic diagram；

Fig. 5 is that single-core fiber bidirectional optical coupler of the present invention uses structural schematic diagram in photoelectric communication circuit.

Specific embodiment

With reference to the accompanying drawing, presently preferred embodiments of the present invention is described in further detail.

A kind of single-core fiber bidirectional optical coupler provided by the invention, including optical fiber, optical device, light emitting diode and Photodiode；Optical device includes a upper end, a lower left end portion and bottom right end, upper end and bottom right end Between place axis in vertical linear setting, the axis angle between lower left end portion, upper end and bottom right end is 0.5 ° ~20 °；Optical fiber is placed in the upper end of optical device, and the light emitting diode is placed in the underface of the lower left end portion；The light Electric diode is placed in the underface of bottom right end, and the institute where photodiode between horizontal plane and upper end and bottom right end In axis perpendicular.

In above-mentioned single-core fiber bidirectional optical coupler, optical fiber can be plastic optical fiber, silica fibre or composite fiber.

In above-mentioned single-core fiber bidirectional optical coupler, when light emitting diode and photodiode are in same level When, the place axis perpendicular between the horizontal plane and upper end and bottom right end；When light emitting diode is each with photodiode When horizontal plane from place is different parallel, place axis between the upper end and bottom right end horizontal plane different with two respectively It is perpendicular.

Above-mentioned optical device can be shape vertical cross-section in " fore-telling " font；Or optical device can be shape and vertically cut Face structure in the shape of a right-angled ladder；Or optical device can be the rectangular triangle structure of shape vertical cross-section.

The material of the optical device be quartz glass prism, organic glass prism, transparent organic resin prism, fill it is transparent The glass or organic glass prism of liquid or gas medium, vacuum glass or organic glass prism.

Embodiment one

As shown in figure 3, a kind of single plastic optical fiber bidirectional optical coupler provided by the invention, including plastic optical fiber POF, it is in The optical device 10, Light-emitting diode LED and photodiode PD of " fore-telling " font；Optical device 10 include a upper end 1, One lower left end portion 2 and bottom right end 3；Wherein, the edge face structure phase of the configuration of upper end 1 and plastic optical fiber POF Unanimously, to ensure indifference adaptation docking between the two.Axis between the upper end 1 and bottom right end 3 of optical device 10 In vertical linear design, and photodiode PD is placed in the underface of 10 bottom right end 3 of optical device, and photodiode PD institute Place axis perpendicular between horizontal plane (not shown) and upper end 1 and bottom right end 3.In this way design, be convenient for into Light (Incident light, abbreviation IL) is penetrated after the total reflection of plastic optical fiber POF, passes through the upper end 1 of optical device 10 And bottom right end 3 is directly vertically injected to the photodiode PD immediately below the bottom right end of optical device 10 3, and then keeps away Exempt from light loss, improves the acceptance rate of incident light IL.

Axis folder in above-mentioned photo-coupler, between the lower left end portion 2 of optical device 10, upper end 1 and bottom right end 3 Angle is 5 °；And Light-emitting diode LED is placed in the underface of 10 lower left end portion 2 of optical device, and the hair that Light-emitting diode LED issues The axis penetrated between the direction of light and the lower left end portion 2 of optical device 10 and upper end 1 is consistent；.It designs in this way, it can be ensured that Lower left end portion 2 and upper end 1 directive plastic optical fiber POF of the transmitting light through optical device 10 that Light-emitting diode LED issues, and by Plastic optical fiber POF is reflected away；Meanwhile can make between Light-emitting diode LED and photodiode PD retain certain level away from From, it is ensured that Light-emitting diode LED is not take up the photosensitive area of photodiode PD, further to promote photodiode PD to entering Penetrate the light receiving efficiency of light.

It is preferred that the axis angle between the lower left end portion 2 of optical device 10, upper end 1 and bottom right end 3 is 1 °, axis Wire clamp angle is as small as possible, under the premise of guaranteeing that Light-emitting diode LED no longer occupies the photosensitive area of photodiode PD, as far as possible Ensure to emit light (Emitted light, abbreviation EL) by injecting plastics behind the lower left end portion 2 of optical device 10 and upper end 1 In optical fiber POF, transferred out after the total reflection using plastic optical fiber POF.

In above-mentioned photo-coupler, optical device 10 should preferentially guarantee that incident light IL is directly incident on photodiode PD On, it is ensured that maximization of the photodiode PD to incident optical power.Control the lower left end portion 2 of optical device 10, upper end 1 and Angle between bottom right end 3, namely the angle of transmitting light EL, allow transmitting light EL all along bevel edge, i.e. a left side for optical device 10 The bevel edge incidence of lower end 2 and 1 place plane of upper end enters plastic optical fiber POF, is totally reflected in plastic optical fiber POF.

Because transmitting light and incident light will not carry out simultaneously in plastic optical fiber POF, Light-emitting diode LED and photoelectricity It is not necessarily to optical isolation between diode PD, and then simplifies canned program.

In above-mentioned photo-coupler, the incident light IL to launch optical device 10 projects photodiode as far as possible On PD, incident light loss is reduced, incident optical lens is equipped between photodiode PD and the bottom right end 3 of optical device 10 (Incident light lens, abbreviation ILL).Correspondingly, Light-emitting diode LED and optical device 10 lower left end portion 2 it Between be equipped with transmitting optical lens (Emitted light lens, abbreviation ELL), make as far as possible emit light EL convergence after project light It learns in device 10, reduces light loss.

Preferably, above-mentioned optical device 10, transmitting optical lens ELL, Light-emitting diode LED, incidence optical lens ILL and light Electric diode LED can be separately as an independent outer structural member；As needed, plastic optical fiber POF is inserted into optical device Behind 10 upper end 1, contact the end face of plastic optical fiber POF with 1 end face of upper end of optical device POF adaptation, to ensure Incident light IL or transmitting light EL do not lose as far as possible.

Embodiment two

As shown in figure 3, being with the difference of embodiment one:

Axis folder in above-mentioned photo-coupler, between the lower left end portion 2 of optical device 10, upper end 1 and bottom right end 3 Angle is 0.5 °.

Light-emitting diode LED and photodiode PD respectively where horizontal plane it is different parallel, and upper end 1 and bottom righthand side Place axis between portion 3 is perpendicular with two different horizontal plane (not shown)s respectively.

Optical device 10 is transparent organic resin prism；Optical fiber is composite fiber.

Embodiment three

As shown in figure 4, being with the difference of embodiment one:

The section of optical device 10 is in a rectangular trapezoid, which also includes a lower left end portion of upper end 1, one 2 and bottom right end 3, and Light-emitting diode LED and photodiode PD are in same level (not shown), so that Place axis perpendicular between the horizontal plane and upper end 1 and bottom right end 3.Wherein, upper end 1 can be regarded as right angle ladder The upper bottom edge of shape, lower left end portion 2 and bottom right end 3 can regard two ends as the trapezoidal bottom of form right angle as；It is incident The trapezoidal right-angle side of the corresponding seamed edge of light IL, the corresponding seamed edge of transmitting light EL are the bevel edge of right-angled trapezium.

Axis folder in above-mentioned photo-coupler, between the lower left end portion 2 of optical device 10, upper end 1 and bottom right end 3 Angle is 20 °.

Optical device 10 is organic glass prism；Optical fiber is silica fibre.

Example IV

Single plastic optical fiber bidirectional optical coupler made from embodiment one is arranged at the application in integrated circuit.

As shown in figure 5, in plastic optical fiber POF, using the semiduplex communication mode of uni-core bidirectional, in different times It is interior, the transmission of light or existed using transmitting light form or existed using incident light in the form of, i.e., incident light and emits light not It exists simultaneously.When receiving incident light, Light-emitting diode LED will not shine；When Light-emitting diode LED emits light It waits, photodiode PD is not processed the incident optical signal received.

The realization of single plastic optical fiber bi-directional light transmissions pass needs a photoelectric conversion chip cooperation, when control instruction SW is 0 When, plastic optical fiber POF is used to do light emission signal channel, at this point, the incident optical receiving circuit where photodiode PD is not It works.When control instruction SW is 1, plastic optical fiber POF is used to do the light receiving signal channel of incident light, at this point, shining Transmitting optical transmission circuit where diode (LED) does not work, and Light-emitting diode LED does not work.It is double that here it is single plastic optical fibers To the application principle of photo-coupler.

It should be understood that the above-mentioned statement for present pre-ferred embodiments is more detailed, can not therefore think It is the limitation to the invention patent protection scope, scope of patent protection of the invention should be determined by the appended claims.

Claims

1. a single-core optical fiber bidirectional optical coupler, is characterized in that, comprises optical fiber, optical device, light-emitting diode and photodiode of " 1 " shape; Described optical device comprises an upper end, a left lower end and a The lower right end, the axis between the upper end and the lower right end is arranged in a vertical line, and the included angle between the axes of the lower left end, the upper end and the lower right end is 0.5° to 20°; The optical fiber is placed on the upper end of the optical device, the light emitting diode is placed directly below the lower left end, the photodiode is placed directly below the lower right end, and the horizontal plane where the photodiode is located is between the upper end and the right end. The axes between the lower ends are perpendicular to each other.

2. A single-core fiber bidirectional optical coupler, characterized in that it comprises an optical fiber, an optical device whose cross section is a right-angled trapezoid, a light-emitting diode and a photodiode; the optical device comprises an upper end, a left lower end and a right lower end The upper end and the lower right end are vertical lines, and the angle between the axes of the lower left end, the upper end and the lower right end is 0.5° to 20°; the optical fiber is placed in the optical device The upper end of the optical device, the light emitting diode is placed directly below the left lower end, the photodiode is placed directly below the right lower end of the optical device, and the photodiode is located between the horizontal plane and the upper end and the right lower end. The axes are perpendicular to each other.

3. The single-core optical fiber bidirectional optical coupler according to claim 1 or 2, wherein the optical fiber is a plastic optical fiber, a silica optical fiber or a composite optical fiber.

4 . The single-core fiber bidirectional optical coupler according to claim 1 or 2 , wherein the axis included angle between the left lower end, the upper end and the right lower end is 5°. 5 .

5 . The single-core optical fiber bidirectional optical coupler according to claim 1 , wherein the incident light directly and vertically enters the photodiode through the optical fiber, the upper end and the lower right end of the optical device. 6 .

6 . The single-core fiber bidirectional optical coupler according to claim 1 or 2 , wherein a light-emitting lens is provided between the light-emitting diode and the lower left end of the optical device. 7 .

7 . The single-core fiber bidirectional optical coupler according to claim 1 , wherein an incident light lens is provided between the photodiode and the lower right end of the optical device. 8 .

8. The single-core optical fiber bidirectional optical coupler according to any one of claims 1 and 2, wherein the optical device is a quartz glass prism, a plexiglass prism, a transparent organic resin prism, a transparent liquid or a gas medium glass or plexiglass prisms, vacuum glass or plexiglass prisms.