CN115494595A - Optical receiving sub-module - Google Patents
Optical receiving sub-module Download PDFInfo
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- CN115494595A CN115494595A CN202211350396.3A CN202211350396A CN115494595A CN 115494595 A CN115494595 A CN 115494595A CN 202211350396 A CN202211350396 A CN 202211350396A CN 115494595 A CN115494595 A CN 115494595A
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- light
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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
- G02B6/4206—Optical features
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- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Light Receiving Elements (AREA)
Abstract
The invention discloses a light receiving submodule, which comprises: an optical fiber, a photodetector and a focusing lens; the optical fiber is provided with a grinding end face with a grinding angle a, a coating layer is arranged on the grinding end face, the passing rate of the coating layer to the light with the incident angle less than a is less than or equal to 1%, and the passing rate to the light with the incident angle more than a +2 degrees is more than or equal to 99.5%; the optical detector is arranged corresponding to the grinding end face; the focusing lens is arranged between the optical fiber and the optical detector and is used for focusing the optical fiber emitted from the optical fiber on the optical detector. The light receiving sub-module provided by the invention can prevent the light reflected by the optical detector from entering the optical fiber through the arrangement of the coating layer, thereby achieving the effect of increasing return loss without increasing the eccentric distance between the optical fiber and the optical detector, and ensuring the responsivity of the light receiving sub-module.
Description
Technical Field
The present invention relates to the field of optical device technology, and more particularly, to a light receiving sub-module.
Background
In the prior art, in order to balance the responsivity and return loss of the optical receive sub-module, the optical fiber and the optical detector need to be eccentrically arranged, and usually, in order to increase the return loss, the eccentric distance between the optical fiber and the optical detector needs to be increased. However, increasing the return loss by increasing the eccentricity distance sacrifices a portion of the responsivity.
Therefore, in view of the above technical problems, it is necessary to provide a new rosa.
Disclosure of Invention
The invention aims to provide a light receiving submodule which has high return loss and responsivity.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the present invention provides a rosa, comprising:
the optical fiber is provided with a grinding end face with a grinding angle a, a coating layer is arranged on the grinding end face, the passing rate of the coating layer to light rays with an incidence angle smaller than a is smaller than or equal to 1%, and the passing rate to light rays with an incidence angle larger than a +2 degrees is larger than or equal to 99.5%;
the optical detector is arranged corresponding to the grinding end face;
and the focusing lens is arranged between the optical fiber and the optical detector and is used for focusing the optical fiber emitted from the optical fiber on the optical detector.
In one or more embodiments, the grinding angle of the grinding end face is 6 to 10 °.
In one or more embodiments, the abrasive end face has an abrasive angle of 8 °.
In one or more embodiments, the coating layer has a light transmittance of less than or equal to 1% for light rays having an angle of incidence of less than 8 ° and a light transmittance of greater than or equal to 99.5% for light rays having an angle of incidence of greater than 10 °.
In one or more embodiments, the photodetector is a photodiode.
In a second aspect, the present invention provides a rosa, comprising:
an optical fiber having a polished end face with a polishing angle of 0 °;
the prism comprises a first light transmitting surface and a second light transmitting surface which are oppositely arranged, the first light transmitting surface is over against the grinding end surface and is parallel to the grinding end surface, the second light transmitting surface is inclined relative to the first light transmitting surface, the inclination angle of the second light transmitting surface is a, a coating layer is arranged on the second light transmitting surface, the passing rate of the coating layer to the light with the incident angle smaller than a is smaller than or equal to 1%, and the passing rate of the coating layer to the light with the incident angle larger than a +2 degrees is larger than or equal to 99.5%;
the light detector is arranged corresponding to the second light transmission surface;
and the focusing lens is arranged between the prism and the optical detector and is used for focusing the optical fiber emitted from the optical fiber on the optical detector.
In one or more embodiments, the second light-transmitting surface is inclined at an angle of 6 to 10 °.
In one or more embodiments, the second light-transmitting surface is inclined at an angle of 8 °.
In one or more embodiments, the coating layer has a light transmittance of less than or equal to 1% for light rays having an angle of incidence of less than 8 ° and a light transmittance of greater than or equal to 99.5% for light rays having an angle of incidence of greater than 10 °.
In one or more embodiments, the photodetector is a photodiode.
Compared with the prior art, the light receiving sub-module provided by the invention can prevent the light reflected by the optical detector from entering the optical fiber through the arrangement of the coating layer, thereby achieving the effect of increasing the return loss without increasing the eccentric distance between the optical fiber and the optical detector, and ensuring the responsivity of the light receiving sub-module.
Drawings
Fig. 1 is a schematic structural diagram of an optical receive sub-module in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a light path in a scenario where the optical receive sub-module is used in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of an optical receive sub-module in embodiment 2 of the present invention;
fig. 4 is a schematic optical path diagram in a scenario where the optical receive sub-module is used in embodiment 2 of the present invention.
Description of the main reference numerals:
21-fiber, 211-ground end face, 22-photodetector, 23-focusing lens, 24-prism, 3-,4-.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Example 1
Referring to fig. 1, the optical receive sub-module in the present embodiment includes: an optical fiber 11, a light detector 12 and a focusing lens 13.
The optical fiber 11 is provided with a grinding end face 111 with a grinding angle a, a coating layer is arranged on the grinding end face 111, the passing rate of the coating layer to light rays with an incidence angle smaller than a is smaller than or equal to 1%, and the passing rate to light rays with an incidence angle larger than a +2 degrees is larger than or equal to 99.5%. The photodetector 12 is disposed corresponding to the ground end surface 111. The focusing lens 13 is disposed between the optical fiber 11 and the optical detector 12, and the focusing lens 13 is used for focusing the optical fiber 11 emitted from the optical fiber 11 on the optical detector 12.
Specifically, the polished end face 111 of the optical fiber 11 is an APC (angular Physical Contact) face, and the polishing angle thereof is 6 to 10 °, that is, the polished end face 111 is provided with an inclined surface at an angle of 6 to 10 °. The angle of the polished end face 111 is preferably an 8 ° angle bevel, and the 8 ° angle polished end face 111 can reflect the incident light to the cladding of the optical fiber 11 through the bevel angle thereof, thereby preventing the optical fiber 11 from directly returning to the light source.
Further, the passing rate of the coating layer for the light with the incidence angle less than 8 degrees is less than or equal to 1 percent, and the passing rate for the light with the incidence angle more than 10 degrees is more than or equal to 99.5 percent. Through the setting of coating film layer, can hinder during light that light detector 12 reflected back gets into optic fibre 11 to can reach the effect that increases return loss, and need not to increase optic fibre 11 and 12 eccentric distances of light detector, with the responsivity of ensureing the light receiving submodule.
In particular, the light detector 12 is a photodiode.
Fig. 2 is a schematic diagram of an optical path in a usage scenario when the optical fiber 11 is polished at an angle of 1118 °. The angle of the light emitted from the optical fiber 11 (the angle between the light and the normal of the polished end face 111) is about 11.8 °, and the light is emitted to the focusing lens 13 after being emitted, and then is focused by the focusing lens 13 and emitted to the light detector 12. A part of the light emitted to the light detector 12 is reflected by the light detector 12, and is deflected by the lens to emit to the polished end surface 111 of the optical fiber 11 at an angle (an included angle with a normal line of the polished end surface 111) of about 4.5 °, and the light reflected back to the optical fiber 11 can be blocked by the coating layer on the polished end surface 111, thereby achieving the effect of increasing the return loss.
Example 2
Referring to fig. 3, the optical receive sub-module in the present embodiment includes: an optical fiber 21, a light detector 22, a focusing lens 23, and a prism 24.
The optical fiber 21 has a polished end face 211 with a polishing angle of 0 °. Prism 24 is including relative first printing opacity face and the second printing opacity face that sets up, first printing opacity face is just right grind terminal surface 211 set up and with grind the terminal surface 211 parallel, the second printing opacity face for first printing opacity face slope and inclination are a, be equipped with the coating film layer on stating the second printing opacity face, the passing rate of coating film layer to the light that the incident angle is less than a is less than or equal to 1%, is greater than or equal to 99.5% to the passing rate of the light that the incident angle is greater than a + 2. The light detector 22 is disposed corresponding to the second light transmission surface. The focusing lens 23 is disposed between the prism 24 and the light detector 22, and the focusing lens 23 is used for focusing the optical fiber 21 emitted from the optical fiber 21 on the light detector 22.
Specifically, the second light transmission surface of the prism 24 is inclined at an angle of 6 to 10 °. Preferably, the second light-transmitting surface is inclined at an angle of 8 °.
Further, the passing rate of the coating layer for the light with the incidence angle less than 8 degrees is less than or equal to 1 percent, and the passing rate for the light with the incidence angle more than 10 degrees is more than or equal to 99.5 percent. Through the setting of coating film layer, can hinder during light that optical detector 22 reflected gets into optic fibre 21 to can reach the effect that increases return loss, and need not to increase optic fibre 21 and optical detector 22 eccentric distance, in order to ensure the responsivity of light receiving submodule piece.
Specifically, the light detector 22 is a photodiode.
Fig. 4 is a schematic diagram of an optical path in a use scene when the inclination angle of the second light-transmitting surface of the prism 24 is 8 ° in the present embodiment. Light emitted from the optical fiber 21 is emitted from the second light transmitting surface at an angle of about 11.8 ° (an angle with the normal line of the second light transmitting surface) after being emitted perpendicularly to the first light transmitting surface of the prism 24, and then emitted toward the focusing lens 23, focused by the focusing lens 23, and emitted toward the light detector 22. A part of the light emitted to the light detector 22 is reflected by the light detector 22, and is deflected by the lens to emit to the second light-transmitting surface at an angle (an included angle with a normal line of the second light-transmitting surface) of about 4.5 degrees, and the reflected light can be blocked by the coating layer on the second light-transmitting surface, so that the reflected optical fiber 21 is prevented from passing through the prism 24 and returning to the optical fiber 21, and the effect of increasing return loss is achieved.
In embodiment 2, the second light transmission surface 242 of the prism 24 is used instead of the polished end surface 111 of the optical fiber 11 in embodiment 1, and the effect of increasing the return loss can be similarly achieved.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. An optical receive sub-module, comprising:
the optical fiber is provided with a grinding end face with a grinding angle a, a coating layer is arranged on the grinding end face, the passing rate of the coating layer to light rays with an incidence angle smaller than a is smaller than or equal to 1%, and the passing rate to light rays with an incidence angle larger than a +2 degrees is larger than or equal to 99.5%;
a light detector disposed corresponding to the ground end face;
and the focusing lens is arranged between the optical fiber and the optical detector and is used for focusing the optical fiber emitted from the optical fiber on the optical detector.
2. The rosa of claim 1, wherein said polished end face has a polishing angle of 6 to 10 °.
3. The rosa of claim 2, wherein said ground facet has a ground angle of 8 °.
4. The rosa of claim 3, wherein said coating has a light transmittance of less than or equal to 1% for light rays having an angle of incidence of less than 8 ° and a light transmittance of greater than or equal to 99.5% for light rays having an angle of incidence of greater than 10 °.
5. The rosa of claim 1, wherein said photodetector is a photodiode.
6. An optical receive sub-module, comprising:
an optical fiber having a polished end face with a polishing angle of 0 °;
the prism comprises a first light transmitting surface and a second light transmitting surface which are oppositely arranged, the first light transmitting surface is over against the grinding end surface and is parallel to the grinding end surface, the second light transmitting surface is inclined relative to the first light transmitting surface, the inclination angle of the second light transmitting surface is a, a coating layer is arranged on the second light transmitting surface, the passing rate of the coating layer to the light with the incident angle smaller than a is smaller than or equal to 1%, and the passing rate of the coating layer to the light with the incident angle larger than a +2 degrees is larger than or equal to 99.5%;
the light detector is arranged corresponding to the second light transmission surface;
and the focusing lens is arranged between the prism and the optical detector and is used for focusing the optical fiber emitted from the optical fiber on the optical detector.
7. The rosa of claim 6, wherein said second light transmitting surface is inclined at an angle of 6 to 10 °.
8. The rosa of claim 7, wherein said second light transmitting surface is inclined at an angle of 8 °.
9. The rosa of claim 8, wherein said coating has a light transmittance of less than or equal to 1% for light rays having an angle of incidence of less than 8 ° and a light transmittance of greater than or equal to 99.5% for light rays having an angle of incidence of greater than 10 °.
10. The rosa of claim 7, wherein said photodetector is a photodiode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211350396.3A CN115494595B (en) | 2022-10-31 | 2022-10-31 | Light receiving sub-module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211350396.3A CN115494595B (en) | 2022-10-31 | 2022-10-31 | Light receiving sub-module |
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| CN115494595A true CN115494595A (en) | 2022-12-20 |
| CN115494595B CN115494595B (en) | 2023-08-01 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1062648A (en) * | 1996-08-19 | 1998-03-06 | Shin Etsu Chem Co Ltd | Optical fiber collimator |
| CN1996074A (en) * | 2006-12-18 | 2007-07-11 | 武汉光迅科技股份有限公司 | Tri-port depolarizing tunable optical filter based on TFF |
| CN106353861A (en) * | 2016-10-31 | 2017-01-25 | 成都优博创通信技术股份有限公司 | Intensive wavelength division multiplexing optical transceiver assembly based on PON system |
| CN213779276U (en) * | 2020-11-12 | 2021-07-23 | 武汉联特科技股份有限公司 | Low return loss detector light path device |
| CN215219246U (en) * | 2021-03-30 | 2021-12-17 | 福建华科光电有限公司 | High-isolation one-way photoelectric detector |
| US20220342160A1 (en) * | 2019-09-25 | 2022-10-27 | Mitsubishi Electric Corporation | Photodetector module and photodetector |
-
2022
- 2022-10-31 CN CN202211350396.3A patent/CN115494595B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1062648A (en) * | 1996-08-19 | 1998-03-06 | Shin Etsu Chem Co Ltd | Optical fiber collimator |
| CN1996074A (en) * | 2006-12-18 | 2007-07-11 | 武汉光迅科技股份有限公司 | Tri-port depolarizing tunable optical filter based on TFF |
| CN106353861A (en) * | 2016-10-31 | 2017-01-25 | 成都优博创通信技术股份有限公司 | Intensive wavelength division multiplexing optical transceiver assembly based on PON system |
| US20220342160A1 (en) * | 2019-09-25 | 2022-10-27 | Mitsubishi Electric Corporation | Photodetector module and photodetector |
| CN213779276U (en) * | 2020-11-12 | 2021-07-23 | 武汉联特科技股份有限公司 | Low return loss detector light path device |
| CN215219246U (en) * | 2021-03-30 | 2021-12-17 | 福建华科光电有限公司 | High-isolation one-way photoelectric detector |
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| CN115494595B (en) | 2023-08-01 |
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