CN219737828U - Light receiving device and optical module - Google Patents
Light receiving device and optical module Download PDFInfo
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- CN219737828U CN219737828U CN202320932014.1U CN202320932014U CN219737828U CN 219737828 U CN219737828 U CN 219737828U CN 202320932014 U CN202320932014 U CN 202320932014U CN 219737828 U CN219737828 U CN 219737828U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 31
- 239000013307 optical fiber Substances 0.000 claims abstract description 17
- 239000010409 thin film Substances 0.000 claims description 61
- 238000006073 displacement reaction Methods 0.000 claims description 22
- 238000003780 insertion Methods 0.000 abstract description 5
- 230000037431 insertion Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000010408 film Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
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- 230000004075 alteration Effects 0.000 description 1
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Abstract
The utility model provides a light receiving device and an optical module, which comprise an optical fiber, an array detector, and a wavelength division multiplexing module used for dividing an optical signal in the optical fiber into a first path of light, a second path of light, a third path of light and a fourth path of light which are arranged side by side and respectively incident into a chip corresponding to the array detector. The optical module provided by the utility model has the characteristics of low cost and low insertion loss.
Description
Technical Field
The present utility model relates to the field of optical communications technologies, and in particular, to a light receiving device and an optical module.
Background
Referring to fig. 1, fig. 1 is a schematic optical path diagram of a light receiving device in the prior art, an optical signal in an optical fiber 100 enters a Z-block310 from a collimating lens 500 on the left side, and a first path of light L1 enters an array converging lens 600 after passing through a first thin film filter 320; the second path of light L2, the third path of light L3 and the fourth path of light L4 are reflected by the reflecting elements on the first film filter 320 and the Z-block310, the second path of light L2 is emitted from the second film filter 330 and enters the array converging lens 600, the third path of light L3 and the fourth path of light L4 are reflected by the reflecting elements on the second film filter 330 and the Z-block310, the third path of light L3 is emitted from the third film filter 340 and enters the array converging lens 600, and finally the fourth path of light L4 is emitted from the fourth film filter 350 and enters the array converging lens 600, and the first path of light L1, the second path of light L2, the third path of light L3 and the fourth path of light L4 entering the array converging lens 600 are reflected by the 45-degree prism 700 and enter the array detector 200.
However, since the pitch between the first thin film filter 320 and the second thin film filter 330 is equal to the pitch between the adjacent two chips corresponding to the array detector 200, the pitch between the second thin film filter 330 and the third thin film filter 340 is equal to the pitch between the adjacent two chips corresponding to the array detector 200, and the pitch between the third thin film filter 340 and the fourth thin film filter 350 is equal to the pitch between the adjacent two chips corresponding to the array detector 200, the pitch between the adjacent thin film filters determines the pitch between the chips of the array detector 200 to be used.
Because of the cut and bond tolerances of TFF, the minimum Y-spacing of the thin film filters (ThinFilmFilter, TFF) currently on the market is 750um, e.g., the spacing between the first and second thin film filters 320, 330 is at a minimum 750um, while the inexpensive array detector 200 chip spacing on the market is 250um. Although the pitch of the arrayed waveguide grating (ArrayedWaveguideGrating, AWG) can be 250um, and can be matched with the chip pitch of the array detector 200, the AWG insertion loss is not applicable in many scenes. In order to make the insertion loss of the light receiving device lower, a TFF scheme is still adopted at present, which results in the increase of cost caused by adopting array detector 200 chips with less dominant spacing larger than 250um, or the increase of cost caused by adopting array detector 200 chips with 250um but only using partial chips with adjacent spacing of 750 um.
Therefore, there is a need for improvements to existing light receiving devices to use array detector chips with a pitch of 250um while employing TFF, and thus lower insertion loss while having lower cost.
Disclosure of Invention
The utility model aims to provide a light receiving device and an optical module, which are used for solving the problems that the existing light receiving device and optical module are low in cost and low in insertion loss and cannot be compatible.
In order to solve the technical problems, the utility model provides a light receiving device, which comprises an optical fiber, an array detector, and a wavelength division multiplexing module for dividing an optical signal in the optical fiber into a first path of light, a second path of light, a third path of light and a fourth path of light which are arranged side by side and respectively incident into a chip corresponding to the array detector, and is characterized by further comprising a displacement prism module for translating the first path of light and the fourth path of light to a position between the second path of light and the third path of light, wherein the displacement prism module is positioned between the wavelength division multiplexing module and the array detector.
Optionally, the displacement prism module includes a first prism and a second prism, the first path of light enters the first prism, and exits from the first prism after being reflected by the first prism for multiple times, the second path of light enters the first prism, and exits from the first prism, the fourth path of light enters the second prism, and exits from the second prism after being reflected by the second prism for multiple times, and the third path of light enters the second prism, and exits from the second prism.
Optionally, the first prism includes a first light incident surface perpendicular to a plane where the first light path and the second light path are located, a first reflecting surface, a first emitting surface and a second reflecting surface, where the first light incident surface and the first emitting surface are arranged in parallel, an included angle between the first reflecting surface and the second reflecting surface is 45 ° with the first light incident surface, the first light path enters the first prism from the first light incident surface, reflects from the first reflecting surface, reflects from the second reflecting surface, and emits from the first emitting surface, and the second light path enters from the first light incident surface and then emits from the first emitting surface.
Optionally, the distance between the first reflecting surface and the second reflecting surface in the direction perpendicular to the optical path is four-ninth D1, where D1 is the maximum distance between the first light path, the second light path, the third light path and the fourth light path emitted from the wavelength division multiplexing module 。
Optionally, the second prism includes a second light incident surface perpendicular to the plane where the first light path and the second light path are located, a third reflecting surface, a second light emergent surface and a fourth reflecting surface, the second light incident surface and the second light emergent surface are arranged in parallel, an included angle between the third reflecting surface and the fourth reflecting surface and the second light incident surface is 45 °, the fourth light path enters the second prism from the second light incident surface, is reflected by the fourth reflecting surface after being reflected by the third reflecting surface, and then exits from the second light emergent surface, and the third light path enters from the second light incident surface and then exits from the second light emergent surface.
Optionally, a distance between the third reflecting surface and the fourth reflecting surface in a direction perpendicular to the optical path is four-ninth D1, where D1 is a maximum distance between the first light path, the second light path, the third light path and the fourth light path emitted from the wavelength division multiplexing module 。
Alternatively, four paths of light emitted from the displacement prism module are distributed at equal intervals.
Optionally, the wavelength division multiplexing module includes a Z-block, a first thin film filter, a second thin film filter, a third thin film filter and a fourth thin film filter, where the first thin film filter, the second thin film filter, the third thin film filter and the fourth thin film filter are sequentially disposed on an exit surface of the Z-block, the first path of light is emitted from the first thin film filter, the second path of light is emitted from the second thin film filter, the third path of light is emitted from the third thin film filter, and the fourth path of light is emitted from the fourth thin film filter.
Optionally, the optical fiber multiplexing module further comprises a collimating lens, and light emitted from the optical fiber enters the wavelength division multiplexing module after passing through the collimating lens.
The utility model provides an optical module, which comprises a light emitting device and the light receiving device for receiving the light signals emitted by the light emitting device.
The light receiving device and the light module provided by the utility model have the following beneficial effects:
the displacement prism module is arranged between the wavelength division multiplexing module and the array detector, and the displacement prism module enables the first path light L1 and the fourth path light L4 emitted from the wavelength division multiplexing module to be translated between the second path light L2 and the third path light emitted from the wavelength division multiplexing module, so that compared with the prior art that the maximum distance along the Y direction between the four paths light entering the array detector is changed from D1 to one third D1, the size of a chip corresponding to the corresponding array detector can be integrally reduced, the distance along the Y direction between adjacent light paths entering the array detector is changed to one third D1, the array detector with smaller distance along the Y direction between the adjacent chips can be adopted, the matching use of the wavelength division multiplexing module with the array detector with larger minimum distance along the Y direction can be realized, the low-insertion-loss characteristic of the wavelength division multiplexing module with larger distance along the Y direction and the low-cost of the array detector with smaller distance along the Y direction can be realized, and the low-cost device can be realized.
Drawings
Fig. 1 is a schematic light path diagram of a light receiving device in the related art;
fig. 2 is a schematic view of an optical path of one view of a light receiving device in an embodiment of the present utility model;
fig. 3 is a schematic view of an optical path of another view angle of the light receiving device in the embodiment of the present utility model;
fig. 4 is a schematic structural view of a first prism in a light receiving device in an embodiment of the present utility model.
Reference numerals illustrate:
100-optical fiber; 200-array detector; 300-wavelength division multiplexing module; 310-Z-block, 320-first thin film filter 320; 330-a second thin film filter 330; 340-a third thin film filter 340; 350-a fourth thin film filter 350; 400-displacement prism module; 410-a first prism; 411-a first light incident surface; 412-a first reflective surface; 413-a first exit face; 414-a second reflective surface; 420-a second prism; 500-collimating lenses; 600-array convergence; 700-45 DEG prism; 800-glass capillary; 910-a substrate; 920-PCB board; l1-first path light; l2-second path light; l3-third light; l4-fourth path light.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 2 and 3, fig. 2 is a schematic diagram of an optical path of one viewing angle of a light receiving device in an embodiment of the present utility model, and fig. 3 is a schematic diagram of an optical path of another viewing angle of the light receiving device in an embodiment of the present utility model, the present embodiment provides a light receiving device, which includes an optical fiber 100, an array detector 200, and a wavelength division multiplexing module 300 for dividing an optical signal in the optical fiber 100 into a first light L1, a second light L2, a third light L3, and a fourth light L4 arranged side by side and respectively incident into a chip corresponding to the array detector 200, and further includes a displacement prism module 400 for translating the first light L1 and the fourth light L4 between the second light L2 and the third light path, where the displacement prism module 400 is located between the wavelength division multiplexing module 300 and the array detector 200.
The displacement prism module 400 is arranged between the wavelength division multiplexing module 300 and the array detector 200, and the displacement prism module 400 enables the first path light L1 and the fourth path light L4 emitted from the wavelength division multiplexing module 300 to be shifted between the second path light L2 and the third path light emitted from the wavelength division multiplexing module 300, so that compared with the maximum spacing in the Y direction between four paths light entering the array detector 200 in the prior art, the maximum spacing in the Y direction is changed from D1 to D1, the size of a chip corresponding to the corresponding array detector 200 can be integrally reduced, the spacing in the Y direction between adjacent light paths entering the array detector 200 can be changed to be smaller than D1, the array detector 200 with smaller spacing in the Y direction between adjacent chips can be adopted, the matching use of the wavelength division multiplexing module 300 with the array detector 200 with smaller minimum spacing in the Y direction can be realized, and the low price of the wavelength division multiplexing module 300 with larger minimum spacing in the Y direction and the low price of the optical receiver device with the low price of the array detector 200 can be achieved.
The four paths of light emitted from the displacement prism module 400 are sequentially arranged side by side according to the second path of light L2, the first path of light L1, the fourth path of light L4 and the third path of light L3, or the second path of light L2, the fourth path of light L4, the first path of light L1 and the third path of light L3 are sequentially arranged side by side.
Referring to fig. 2, in the present embodiment, four paths of light emitted from the displacement prism module 400 are distributed at equal intervals, that is, the interval between two adjacent light beams in the Y direction in the four paths of light passing through the displacement prism module 400 is one ninth D1, so that the array detector 200 can be optimally used. For example, the minimum Y-pitch of the wavelength division multiplexing module 300 is 750um, and the minimum Y-pitch of the chips of the array probe 200 is 250um.
In this embodiment, the second light path L2, the first light path L1, the fourth light path L4, and the third light path L3 are sequentially arranged side by side. Thus, the displacement prism module 400 that can use occupies a smaller volume, and simultaneously avoids that the first path of light L1 and the fourth path of light L4 need to sequentially pass through two prisms, so that the number of the passed prisms is reduced, and the light loss is reduced.
Referring to fig. 2, the displacement prism module 400 includes a first prism 410 and a second prism 420. The first light L1 enters the first prism 410 and exits from the first prism 410 after being reflected by the first prism 410 for multiple times, and the second light L2 enters the first prism 410 and exits from the first prism 410. The fourth light L4 enters the second prism 420, and is reflected by the second prism 420 for multiple times, and then exits from the second prism 420, and the third light L3 enters the second prism 420 and exits from the second prism 420.
Specifically, referring to fig. 4, fig. 4 is a schematic structural diagram of a first prism 410 in a light receiving device in an embodiment of the present utility model, where the first prism 410 includes a first light incident surface 411 perpendicular to a plane where the first light and the second light are located, a first reflecting surface 412, a first light emitting surface 413, and a second reflecting surface 414, the first light incident surface 411 and the first light emitting surface 413 are disposed in parallel, and an angle between the first reflecting surface 412 and the second reflecting surface 414 and the first light incident surface 411 is 45 °, the first light L1 enters the first prism 410 from the first light incident surface 411, is reflected by the second reflecting surface 414 after being reflected by the first reflecting surface 412, and then exits from the first light emitting surface 413, and the second light L2 enters from the first light incident surface 411 and then exits from the first light emitting surface 413.
In this embodiment, the distance between the first reflecting surface 412 and the second reflecting surface 414 in the direction perpendicular to the optical path is four-ninth D1.
The second prism 420 includes a second light incident surface perpendicular to the plane where the first light path and the second light path are located, a third reflecting surface, a second light exit surface, and a fourth reflecting surface, where the second light incident surface and the second light exit surface are parallel, and an included angle between the third reflecting surface and the fourth reflecting surface and the second light incident surface is 45 °, the fourth light L4 enters the second prism 420 from the second light incident surface, is reflected by the fourth reflecting surface after being reflected by the third reflecting surface, and then exits from the second light exit surface, and the third light L3 enters from the second light incident surface and then exits from the second light exit surface.
In this embodiment, the distance between the third reflecting surface and the fourth reflecting surface in the direction perpendicular to the optical path is four-ninth D1.
Referring to fig. 2, the wavelength division multiplexing module 300 includes a Z-block310, a first thin film filter 320, a second thin film filter 330, a third thin film filter 340, and a fourth thin film filter 350, where the first thin film filter 320, the second thin film filter 330, the third thin film filter 340, and the fourth thin film filter 350 are sequentially disposed on an exit surface of the Z-block 310. After the light is transmitted from the optical fiber 100 to the Z-block310, the light is split into four paths and emitted from the first thin film filter 320, the second thin film filter 330, the third thin film filter 340 and the fourth thin film filter 350, the first path of light L1 is emitted from the first thin film filter 320, the second path of light L2 is emitted from the second thin film filter 330, the third path of light L3 is emitted from the third thin film filter 340, and the fourth path of light L4 is emitted from the fourth thin film filter 350.
The light receiving device further includes a collimating lens 500, and the light emitted from the optical fiber 100 enters the wavelength division multiplexing module 300 after passing through the collimating lens 500.
Referring to fig. 3, the light receiving device further includes an array converging lens 600, and the light emitted from the displacement prism module 400 enters the array detector 200 after passing through the array converging lens 600.
Referring to fig. 3, the light receiving device further includes a 45 ° prism 700, and light exiting from the displacement prism module 400 enters the array detector 200 through the 45 ° prism 700.
Referring to fig. 2, the light receiving device further includes a glass capillary 800, and the glass capillary 800 is used for mounting and fixing the optical fiber 100.
The light receiving device further includes a substrate 910, and the glass capillary 800, the wavelength division multiplexing module 300, the displacement prism module 400, and the 45 ° prism 700 are disposed on the substrate 910.
The light receiving device further includes a PCB board 920, the substrate 910 is disposed on the PCB board 920, and the array probe 200 is disposed on the substrate 910.
The light path of the light receiving device is as follows:
the optical signal enters the Z-block310 from the collimating lens 500 on the left side after passing through the collimating lens 500, L1 enters the first prism 410 from the first light entrance face 411 after passing through the first thin film filter 320, and exits from the first exit face 413 after being reflected by the first reflecting face 412 and the second reflecting face 414, and enters the array converging lens 600; after being reflected by the first thin film filter 320 and the reflecting element on the Z-block310, L2, L3 and L4 enter the first prism 410 from the first light incident surface 411 after exiting from the second thin film filter 330, and enter the array converging lens 600 through the first exit surface 413; l3 and L4 are reflected by the second thin film filter 330 and the reflecting element on the Z-block310, and L3 enters the second prism 420 from the second light incident surface after exiting from the third thin film filter 340, and then enters the array converging lens 600; l4 is reflected by the third thin film filter 340 and the reflecting element on the Z-block310, enters the second prism from the second light incident surface after exiting from the fourth thin film filter 350, exits from the second light emergent surface after being reflected by the third reflecting surface and the fourth reflecting surface, and enters the array converging lens 600; l1, L2, L3 and L4 entering the array converging lens 600 mirror are reflected by the 45 DEG prism 700 and enter the array detector 200.
The present embodiment also provides an optical module including a light emitting device and the light receiving device in the above embodiments, where the light receiving device is configured to receive an optical signal emitted by the light emitting device.
The above description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (10)
1. The light receiving device comprises an optical fiber, an array detector, a wavelength division multiplexing module and a displacement prism module, wherein the optical fiber is used for dividing an optical signal in the optical fiber into a first path of light, a second path of light, a third path of light and a fourth path of light which are arranged side by side and respectively incident into a chip corresponding to the array detector.
2. The light receiving device according to claim 1, wherein the displacement prism module includes a first prism and a second prism, the first light enters the first prism and exits the first prism after being reflected by the first prism a plurality of times, the second light enters the first prism and exits the first prism, the fourth light enters the second prism and exits the second prism after being reflected by the second prism a plurality of times, and the third light enters the second prism and exits the second prism.
3. The light receiving device according to claim 2, wherein the first prism includes a first light entrance surface, a first reflection surface, a first exit surface, and a second reflection surface perpendicular to a plane in which the first light and the second light are located, the first light entrance surface and the first exit surface are disposed in parallel, and an angle between the first reflection surface and the second reflection surface is 45 ° with respect to the first light entrance surface, the first light enters the first prism from the first light entrance surface, is reflected from the first reflection surface, is reflected from the second reflection surface, and then exits from the first exit surface, and the second light enters from the first light entrance surface and then exits from the first exit surface.
4. The light-receiving device according to claim 3, wherein a pitch of the first reflecting surface and the second reflecting surface in a direction perpendicular to an optical path is four-nineteenth D1, wherein D1 is a maximum pitch between the first light, the second light, the third light, and the fourth light exiting from the wavelength division multiplexing module 。
5. The light receiving device according to claim 2, wherein the second prism includes a second light entrance surface, a third reflection surface, a second exit surface, and a fourth reflection surface perpendicular to a plane in which the first light and the second light are located, the second light entrance surface and the second exit surface are arranged in parallel, and an angle between the third reflection surface and the fourth reflection surface and the second light entrance surface is 45 °, the fourth light enters the second prism from the second light entrance surface, is reflected from the third reflection surface, is reflected from the fourth reflection surface, and then exits from the second exit surface, and the third light enters from the second light entrance surface and then exits from the second exit surface.
6. The light-receiving device according to claim 5, wherein a pitch of the third reflecting surface and the fourth reflecting surface in a direction perpendicular to an optical path is four-ninth D1, wherein D1 is a maximum pitch between the first path light, the second path light, the third path light, and the fourth path light emitted from the wavelength division multiplexing module 。
7. The light receiving device of claim 1, wherein four paths of light exiting the displacement prism module are equally spaced.
8. The light receiving device according to claim 1, wherein the wavelength division multiplexing module includes a Z-block, a first thin film filter, a second thin film filter, a third thin film filter, and a fourth thin film filter, the first thin film filter, the second thin film filter, the third thin film filter, and the fourth thin film filter being sequentially disposed on an exit surface of the Z-block, the first path of light exiting the first thin film filter, the second path of light exiting the second thin film filter, the third path of light exiting the third thin film filter, and the fourth path of light exiting the fourth thin film filter.
9. The light receiving device of claim 1, further comprising a collimating lens, wherein light exiting the optical fiber passes through the collimating lens and then enters the wavelength division multiplexing module.
10. An optical module comprising a light emitting device, further comprising a light receiving device according to any of claims 1-9 for receiving an optical signal emitted by the light emitting device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320932014.1U CN219737828U (en) | 2023-04-24 | 2023-04-24 | Light receiving device and optical module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320932014.1U CN219737828U (en) | 2023-04-24 | 2023-04-24 | Light receiving device and optical module |
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| CN219737828U true CN219737828U (en) | 2023-09-22 |
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