CN113433628A - Low-crosstalk single-wavelength optical device - Google Patents
Low-crosstalk single-wavelength optical device Download PDFInfo
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- CN113433628A CN113433628A CN202110699605.4A CN202110699605A CN113433628A CN 113433628 A CN113433628 A CN 113433628A CN 202110699605 A CN202110699605 A CN 202110699605A CN 113433628 A CN113433628 A CN 113433628A
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- optical fiber
- light
- sheet
- inner cavity
- laser
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
-
- 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
- H04B10/40—Transceivers
Abstract
The invention relates to a low-crosstalk single-wavelength optical device in the technical field of optical fiber communication, which comprises a BASE (BASE station), wherein the inner cavity of the BASE is coated with black glue, an LD (laser diode) laser and an optical fiber are respectively inserted into two ends of the inner cavity, a PD (photo detector) is inserted into the top of the inner cavity, and a light splitting sheet and a light absorbing sheet which are matched with each other are arranged in the inner cavity in a suspended mode through a support; the end face of the optical fiber corresponding to the LD laser is provided with an angle, and the high point direction of the end face of the optical fiber is fixed to couple the direction of the PD photoelectric detector port; the light splitting sheets are inclined at an angle of 45 degrees; the light absorption sheet is arranged right below the light splitting sheet and is inclined by 10 degrees. The invention effectively improves the performance of the device by mutually matching the light splitting sheet, the light absorbing sheet and the optical fiber with the inclined end face, and the crosstalk performance is improved to be below-25 dB from the traditional crosstalk value of-20 dB; the condition that the crosstalk value of a traditional single-wavelength optical device is large is effectively improved, and the problems that the yield of the device is low and the manufacturing cost is high are effectively solved.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a single-wavelength optical device with low crosstalk.
Background
Currently, the wavelength division multiplexing single-fiber bidirectional communication technology has been widely applied in the field of optical communication, and as a core component of wavelength division multiplexing single-fiber bidirectional optical communication, there are also various design schemes for wavelength division multiplexing optical transceiver integrated single-fiber bidirectional devices, in which the wavelength of emission and the wavelength of reception are the same and are called as same wavelength division multiplexing optical transceiver integrated single-fiber bidirectional devices; the device has the defect of large crosstalk, stray light at the transmitting end and light at the transmitting end can enter the detector through the transmission of the ceramic end face of the optical fiber end face to form crosstalk and interfere the normal work of the detector; in the prior art, the problem of emission of the end face of the optical fiber is mostly solved by plating an antireflection film on the end face of the optical fiber or reducing partial emission through chamfering of the ceramic ferrule, but the problem that stray light at the emission end enters a detector cannot be effectively solved, and the problem that emitted light at the end face of the ceramic ferrule enters the detector after being reflected cannot be effectively solved. Therefore, a low crosstalk single wavelength optical device is needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a low-crosstalk single-wavelength optical device which comprises a BASE BASE, wherein the inner cavity of the BASE BASE is coated with black glue and used for absorbing light diffused in a cavity, an LD (laser diode) laser and an optical fiber are respectively inserted into two ends of the inner cavity, the LD laser and the optical fiber are coaxially arranged, a PD (photo diode) photodetector is inserted into the top of the inner cavity, and a light splitting sheet and a light absorbing sheet which are matched with each other are arranged in the inner cavity in a suspended mode through a support;
the optical fiber is connected with an SC/APC optical fiber cold joint, the end face of the optical fiber corresponding to the LD laser is provided with an angle, and the high point direction of the end face of the optical fiber couples and welds the direction of the PD photoelectric detector port; the direction of a high point of the end face of the optical fiber is determined during coupling, and the direction of the high point of the end face of the optical fiber is ensured to point to the direction of the port of the PD photoelectric detector, so that light emitted by the LD laser enters the optical fiber during most of optical coupling, and a small part of light cannot be reflected into the PD photoelectric detector on the end face of the optical fiber;
the light splitting sheet is positioned between the LD laser and the optical fiber, and the upper end of the light splitting sheet is inclined by 45 degrees towards the LD laser;
the light absorbing sheet is arranged under the light splitting sheet and is inclined by 10 degrees, light emitted by the LD laser can reflect stray light which is transmitted upwards and downwards after passing through the 45-degree light splitting sheet, the downward light is absorbed by the light absorbing sheet with the inclination angle of 10 degrees, the light is prevented from being reflected in the cavity, and a small part of light reflected from the end face of the optical fiber can be absorbed by the light absorbing sheet with the inclination angle of 10 degrees or black glue in the cavity and cannot be reflected into the PD photoelectric detector.
Preferably, the black glue is BF-4 black glue.
Preferably, the light splitting sheet is fixed on the bracket of the inner cavity through glue.
Preferably, four corners of the light absorption sheet are fixed with the bracket through black glue.
The present invention also includes other components that enable the normal use of a low crosstalk single wavelength optical device, all as is conventional in the art. In addition, the devices or components which are not limited in the invention all adopt the conventional technical means in the field, and for example, the BASE, the LD laser, the PD photodetector, the bracket, the light splitting sheet, the light absorbing sheet and the like are all conventional equipment in the field.
The working principle of the invention is that by utilizing the reflection principle of light (an optical phenomenon, which refers to the phenomenon that when light is transmitted to different substances, the transmission direction is changed on an interface and the light returns to the original substance), the light emitted from an LD laser firstly passes through a light splitting sheet obliquely arranged at an angle of 45 degrees and reflects stray light which is transmitted upwards and downwards, and the downward stray light is absorbed by a light absorbing sheet arranged at an oblique angle of 10 degrees to prevent the stray light from being reflected in the inner cavity of the BASE BASE. The light penetrating through the light splitting piece reaches the optical fiber, because the end face of the optical fiber corresponding to the LD laser is provided with an angle, and the high point direction of the end face of the optical fiber is determined to couple the direction of the PD photoelectric detector port, the high point direction of the end face of the optical fiber is ensured to point to the direction of the PD photoelectric detector port, so that the light emitted by the LD laser enters the optical fiber when most of the light is coupled, and a small part of the light cannot be reflected into the PD photoelectric detector on the end face of the optical fiber; in addition, BF-4 black glue is coated on the inner wall of the inner cavity of the BASE BASE and used for absorbing light which is subjected to diffuse reflection in the inner cavity, so that the effect of reducing the light which enters the PD photoelectric detector through the diffuse reflection in the inner cavity is achieved, and the crosstalk value of the device can reach the effect of below-25 dB by matching with the light splitting sheet and the light absorbing sheet.
The insertion, coupling, welding and other manners in the present invention all adopt the conventional means in the prior art and the field, and are not described herein again.
The invention has the advantages that the performance of the device is effectively improved, the crosstalk performance is greatly improved, the qualification rate of the device is improved, the cost is saved, the condition of large crosstalk value of the traditional single-wavelength optical device is effectively improved, and the problems of low yield and high manufacturing cost of the device are effectively solved through the mutual matching of the light splitting sheet, the light absorbing sheet and the optical fiber with the inclined end face.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of a low crosstalk single wavelength optical device according to the present application;
FIG. 2 is a schematic view of the internal structure of the BASE of FIG. 1;
FIG. 3 is a right side view of the light splitter and the light absorbing sheet of FIG. 2;
fig. 4 is a diagram of the optical path in the BASE of BASE.
In the figure: the optical fiber detection device comprises a BASE BASE, a light absorption sheet 2, a light splitting sheet 3, an LD laser 4, an optical fiber 5, a high point of an end face of the optical fiber 6, a PD photoelectric detector 7, a support 8, an SC/APC optical fiber cold joint 9 and BF-4 black glue 10.
Detailed Description
The present invention will be described more clearly with reference to the accompanying drawings, which are included to illustrate and not to limit the present invention. All other embodiments, which can be obtained by those skilled in the art without any inventive step based on the embodiments of the present invention, should be included in the scope of the present invention.
Examples
As shown in fig. 1-4, the present invention provides a low crosstalk single-wavelength optical device, including a BASE 1, an inner cavity of the BASE 1 is coated with black glue to absorb light diffused in the cavity, two ends of the inner cavity are respectively inserted with an LD laser 4 and an optical fiber 5, the LD laser 4 and the optical fiber 5 are coaxially disposed, a PD photodetector 7 is inserted at the top of the inner cavity, and a light splitting sheet 3 and a light absorbing sheet 2 which are mutually matched are suspended in the inner cavity through a bracket 8;
the optical fiber 5 is connected with an SC/APC optical fiber cold joint 9, the optical fiber 5 uses a tail fiber with an optical fiber end face angle of 11.7 degrees, and the direction of a high point 6 of the optical fiber end face couples and welds the direction of a PD photoelectric detector port; the direction of the high point 6 of the end face of the optical fiber is determined during coupling, and the direction of the high point 6 of the end face of the optical fiber is ensured to point to the direction of the port of the PD photoelectric detector, so that light emitted by the LD laser 4 enters the optical fiber 6 during most of optical coupling, and a small part of light cannot be reflected to the PD photoelectric detector 7 on the end face of the optical fiber;
the light splitting sheet 3 is positioned between the LD laser 4 and the optical fiber 5, and the upper end of the light splitting sheet 3 is inclined to the LD laser 4 by an angle of 45 degrees;
the light absorption sheet 2 is located right below the light splitting sheet 3, the light absorption sheet 2 is arranged in an inclined manner at 10 degrees, light emitted by the LD laser 4 can reflect stray light which propagates upwards and downwards after passing through the light splitting sheet 3 at 45 degrees, the downward stray light is absorbed by the light absorption sheet 2 placed at an inclination angle of 10 degrees, reflection in the cavity is prevented, and a small part of light reflected from the end face of the optical fiber can be absorbed by the light absorption sheet 2 placed at an inclination angle of 10 degrees or black glue in the cavity and cannot be reflected into the photoelectric detector 7.
The black glue is BF-4 black glue 10.
The light splitting sheet 3 is fixed on a bracket 8 of the inner cavity through black glue.
Four corners of the light absorbing sheet 2 are fixed with the bracket 8 through black glue.
When the single-wavelength optical device with low crosstalk is processed, firstly, the light absorption sheet 2 is placed in the inner cavity of the BASE BASE 1, the light absorption sheet 2 is not placed flatly, but is placed at an inclination angle of 10 degrees, after the angle of the light absorption sheet 2 is adjusted, the four angular positions of the light absorption sheet 2 are fixed by using black glue, and the bottom of the light absorption sheet 2 cannot be stained with the black glue; then a cured 45-degree inclined light splitter 3 is placed, the light splitter 3 is placed right above the light absorbing sheet 2 and fixed with the bracket 8 by glue, and then BF-4 black glue 10 is coated in the inner cavity of the BASE BASE 1 to absorb light diffused to the wall of the cavity; and finally assembling an LD laser 4, coupling an optical fiber 5 and coupling a receiving end, selecting a tail fiber with the end face angle of 11.7 degrees, coupling the direction of the PD photoelectric detector port by fixing the direction of a high point 6 of the end face of the optical fiber, welding, and solidifying glue after the RES index reaches the qualified value of the device by the coupling performance. And testing the performance of the device, wherein the crosstalk value is less than-25 dB and is a qualified product. The performance of the produced single-wavelength optical device with low crosstalk is improved from-20 dB to below-25 dB of the traditional crosstalk value; the qualification rate is improved from about 60% to over 90% in the traditional technology; the cost is saved, and the loss on the cost is reduced by 50 percent compared with the traditional method.
When the laser works, by utilizing the reflection principle of light (an optical phenomenon, which means that when light is transmitted to different substances, the transmission direction is changed on an interface and the light returns to the original substance), the light emitted from the LD laser 4 firstly passes through the light splitting sheet 3 obliquely arranged at an angle of 45 degrees, stray light which is transmitted upwards and downwards can be reflected, and the downward stray light is absorbed by the light absorbing sheet 2 arranged at an inclination angle of 10 degrees, so that the stray light is prevented from being reflected in the inner cavity of the BASE BASE 1. The light penetrating through the light splitting sheet 3 reaches the optical fiber 5, because the end face of the optical fiber 5 corresponding to the LD laser 4 is provided with an angle, and the direction of the high point 6 of the end face of the optical fiber is determined to couple the direction of the PD photoelectric detector port, the direction of the high point 6 of the end face of the optical fiber is ensured to point to the direction of the PD photoelectric detector port, so that the light emitted by the LD laser 4 enters the optical fiber 5 when most of the light is coupled, and a small part of the light cannot be reflected into the PD photoelectric detector 7 on the end face of the optical fiber; in addition, BF-4 black glue 10 is coated on the inner wall of the inner cavity of the BASE BASE 1 and used for absorbing light which is subjected to diffuse reflection in the inner cavity, so that the effect of reducing the light which enters the PD photoelectric detector 7 through the diffuse reflection in the inner cavity is achieved, the cross talk value of the device can reach the effect below minus 25dB by matching with the light splitting sheet 3 and the light absorbing sheet 2, the qualification rate is improved to more than 90% from about 60% of the qualification rate of the traditional technology, the cost is saved, and the loss in the cost is reduced by 50% compared with the traditional technology.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A low crosstalk, single wavelength optical device comprising a BASE, wherein: the inner cavity of the BASE is coated with black glue, an LD laser and an optical fiber are respectively inserted into two ends of the inner cavity, the LD laser and the optical fiber are coaxially arranged, a PD photoelectric detector is inserted into the top of the inner cavity, and a light splitting sheet and a light absorbing sheet which are matched with each other are arranged in the inner cavity in a suspended mode through a support;
the end face of the optical fiber corresponding to the LD laser is provided with an angle, and the direction of a high point of the end face of the optical fiber couples the direction of the PD photoelectric detector port;
the light splitting sheet is positioned between the LD laser and the optical fiber, and the upper end of the light splitting sheet is inclined by 45 degrees towards the LD laser;
the light absorption sheet is located right below the light splitting sheet and is inclined by 10 degrees.
2. A low crosstalk, single wavelength optical device according to claim 1, wherein: the black glue is BF-4 black glue.
3. A low crosstalk, single wavelength optical device according to claim 1, wherein: the light splitting piece is fixed on the bracket of the inner cavity through glue.
4. A low crosstalk, single wavelength optical device according to claim 1, wherein: and four corners of the light absorbing sheet are fixed with the bracket through black glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110699605.4A CN113433628A (en) | 2021-06-23 | 2021-06-23 | Low-crosstalk single-wavelength optical device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110699605.4A CN113433628A (en) | 2021-06-23 | 2021-06-23 | Low-crosstalk single-wavelength optical device |
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|---|---|
| CN113433628A true CN113433628A (en) | 2021-09-24 |
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| CN202110699605.4A Pending CN113433628A (en) | 2021-06-23 | 2021-06-23 | Low-crosstalk single-wavelength optical device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080187315A1 (en) * | 2007-01-25 | 2008-08-07 | Sumitomo Electric Industries, Ltd. | Bi-directional optical module with improved optical crosstalk |
| CN202102148U (en) * | 2011-05-27 | 2012-01-04 | 武汉电信器件有限公司 | Single-fiber bidirectional photoelectric component |
| CN104062722A (en) * | 2014-05-30 | 2014-09-24 | 江苏飞格光电有限公司 | Low-crosstalk same wavelength division multiplexing light receiving-transmitting integrated single-fiber bidirectional device |
| CN107077002A (en) * | 2014-10-23 | 2017-08-18 | 索尼互动娱乐股份有限公司 | Virtual image distance changes device, virtual image Range Change Method and program |
| CN110727111A (en) * | 2019-10-23 | 2020-01-24 | 深圳惠牛科技有限公司 | Head-mounted display optical system and head-mounted display equipment |
| CN210119609U (en) * | 2019-07-24 | 2020-02-28 | 深圳市亚派光电器件有限公司 | Single-fiber bidirectional photoelectric conversion device and base thereof |
| CN210427879U (en) * | 2019-08-20 | 2020-04-28 | 绍兴中科通信设备有限公司 | High-speed 25G coaxial single-fiber bidirectional optical device with same wavelength |
-
2021
- 2021-06-23 CN CN202110699605.4A patent/CN113433628A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080187315A1 (en) * | 2007-01-25 | 2008-08-07 | Sumitomo Electric Industries, Ltd. | Bi-directional optical module with improved optical crosstalk |
| CN202102148U (en) * | 2011-05-27 | 2012-01-04 | 武汉电信器件有限公司 | Single-fiber bidirectional photoelectric component |
| CN104062722A (en) * | 2014-05-30 | 2014-09-24 | 江苏飞格光电有限公司 | Low-crosstalk same wavelength division multiplexing light receiving-transmitting integrated single-fiber bidirectional device |
| CN107077002A (en) * | 2014-10-23 | 2017-08-18 | 索尼互动娱乐股份有限公司 | Virtual image distance changes device, virtual image Range Change Method and program |
| CN210119609U (en) * | 2019-07-24 | 2020-02-28 | 深圳市亚派光电器件有限公司 | Single-fiber bidirectional photoelectric conversion device and base thereof |
| CN210427879U (en) * | 2019-08-20 | 2020-04-28 | 绍兴中科通信设备有限公司 | High-speed 25G coaxial single-fiber bidirectional optical device with same wavelength |
| CN110727111A (en) * | 2019-10-23 | 2020-01-24 | 深圳惠牛科技有限公司 | Head-mounted display optical system and head-mounted display equipment |
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Application publication date: 20210924 |