CN210442547U - Light receiving engine based on planar waveguide chip - Google Patents
Light receiving engine based on planar waveguide chip Download PDFInfo
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- CN210442547U CN210442547U CN201921429384.3U CN201921429384U CN210442547U CN 210442547 U CN210442547 U CN 210442547U CN 201921429384 U CN201921429384 U CN 201921429384U CN 210442547 U CN210442547 U CN 210442547U
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Abstract
The application relates to a light receiving engine based on planar waveguide chip belongs to optical communication technical field, and light receiving engine based on planar waveguide chip includes: the array waveguide chip is used for receiving optical signals sent by optical fibers, an output waveguide of the array waveguide chip is provided with a multimode waveguide structure, and light is incident to the array waveguide chip and then is output through the output waveguide; the mode field distribution of the light rays with different wavelengths corresponding to the output waveguide is different; a detector coupled to the array waveguide chip, a photosensitive area of the detector being determined based on a mode field distribution range of the output waveguide; and an amplifier connected to the detector; the problem of low coupling efficiency between the conventional array waveguide chip and a detector can be solved; due to the fact that the photosensitive area of the detector is optimized, the photosensitive area can be matched with a light spot mode field of the waveguide chip, and coupling efficiency is improved.
Description
Technical Field
The application relates to a light receiving engine based on a planar waveguide chip, and belongs to the technical field of optical communication.
Background
With the advent of the 5G era, the demand for data transmission has increased dramatically, and optical fiber communication technology has been gaining attention due to its high bandwidth characteristics. The optical transceiver is an important ring in an optical communication integral link, and the optical transceiver is required to realize the conversion of optical signals functionally.
Since the wavelength division multiplexing structure can effectively utilize the high bandwidth characteristics of the optical fiber, a wavelength division multiplexing device can be used to couple multiple optical signals with different wavelengths to a single optical fiber. In order to realize the coupling and decoupling functions of light in an optical fiber with a wavelength division multiplexing structure, an array waveguide chip is generally used to realize light splitting processing of light in the optical fiber.
At the light receiving end, the array waveguide chip needs to have wavelength insensitivity, i.e. flat-top transmission spectrum. In a typical manner, a flat-top transmission spectrum is achieved by making the output waveguides of the arrayed waveguide chip into a multi-mode waveguide structure. At this time, when the wavelength is changed, the mode field distribution of the output waveguide of the arrayed waveguide chip is correspondingly changed.
The array waveguide chip with the multimode waveguide structure cannot keep the single mode field characteristic of the emergent end, so that the coupling between the array waveguide chip and the detector is difficult, and the coupling efficiency is low.
SUMMERY OF THE UTILITY MODEL
The application provides a light receiving engine based on a planar waveguide chip, which can solve the problem that the coupling efficiency between the existing array waveguide chip and a detector is low. The application provides the following technical scheme:
a planar waveguide chip based light receiving engine comprising:
the array waveguide chip is used for receiving optical signals sent by optical fibers, an output waveguide of the array waveguide chip is provided with a multimode waveguide structure, and light is incident to the array waveguide chip and then is output through the output waveguide; the mode field distribution of the light rays with different wavelengths corresponding to the output waveguide is different;
a detector coupled to the array waveguide chip, a photosensitive area of the detector being determined based on a mode field distribution range of the output waveguide; and the number of the first and second groups,
an amplifier connected to the detector.
Optionally, a normal direction of a light emitting surface of the arrayed waveguide chip points to the photosensitive area of the detector.
Optionally, the array waveguide chip is formed with a total reflection surface, and the total reflection surface is used for totally reflecting the light transmitted in the array waveguide chip to the upper surface of the array waveguide chip for emergence; the center of the photosensitive area of the detector coincides with the center of the output optical field of the upper surface.
Optionally, the arrayed waveguide chip is supported by a support, so that the detector is separated from a region of the upper surface of the arrayed waveguide chip for emitting light by a preset distance.
Optionally, a photosensitive region of the detector includes a mode field distribution range of the output waveguide, and a size of the photosensitive region is less than or equal to a size threshold.
Optionally, the mode field distribution range is rectangular in shape, accordingly, the photosensitive area of the detector is rectangular, and a ratio of a width to a height of the rectangle of the photosensitive area is equal to a ratio of a width to a height of the rectangle of the mode field distribution range.
Optionally, the shape of the mode field distribution range is an ellipse, and accordingly, the photosensitive area of the detector is an ellipse, and the ratio of the major axis to the minor axis of the ellipse of the photosensitive area is equal to the ratio of the major axis to the minor axis of the ellipse of the mode field distribution range.
Optionally, the probe is connected to the amplifier by gold wire bonding.
Optionally, the arrayed waveguide chip comprises a core layer and a cladding layer wrapped around the core layer, and the width-to-height ratio of the core layer ranges from [3, 5 ]; the difference between the refractive index of the core layer and the refractive index of the clad layer was in the range of [ 0.75%, 2.5% ].
Optionally, the amplifier is a transimpedance amplifier.
The beneficial effect of this application lies in: the array waveguide chip is used for receiving optical signals sent by the optical fibers, the output waveguide of the array waveguide chip is of a multi-mode waveguide structure, and light is incident to the array waveguide chip and then is output through the output waveguide; the mode field distribution of the light rays with different wavelengths corresponding to the output waveguide is different; a detector coupled to the array waveguide chip, a photosensitive area of the detector being determined based on a mode field distribution range of the output waveguide; and an amplifier connected to the detector; the problem of low coupling efficiency between the conventional array waveguide chip and a detector can be solved; due to the fact that the photosensitive area of the detector is optimized, the photosensitive area can be matched with a light spot mode field of the waveguide chip, and coupling efficiency is improved.
The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clear and clear, and to implement the technical solutions according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present application and the accompanying drawings.
Drawings
Fig. 1 and fig. 2 are schematic structural diagrams of a planar waveguide chip-based light receiving engine according to an embodiment of the present application;
FIG. 3 is a schematic cross-sectional view of an arrayed waveguide chip provided by an embodiment of the present application;
FIG. 4 is a schematic view of a photosensitive area of a detector provided in accordance with an embodiment of the present application;
fig. 5 is a schematic view of a photosensitive area of a detector according to another embodiment of the present application.
Detailed Description
The following detailed description of embodiments of the present application will be described in conjunction with the accompanying drawings and examples. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
Fig. 1 and fig. 2 are schematic structural diagrams of a planar waveguide chip-based light receiving engine according to an embodiment of the present application, and as shown in the drawings, the light receiving engine at least includes:
the array waveguide chip 1 is used for receiving optical signals sent by optical fibers, an output waveguide of the array waveguide chip 1 is of a multimode waveguide structure, and light is incident to the array waveguide chip 1 and then is output through the output waveguide; the mode field distribution of the light rays with different wavelengths corresponding to the output waveguide is different;
the detector 2 is coupled with the array waveguide chip 1, and the photosensitive area of the detector 2 is determined based on the mode field distribution range of the output waveguide; and the number of the first and second groups,
an amplifier 3 connected to the detector 2.
Alternatively, the photosensitive area of the detector 2 is determined based on the variation range of the peak position in the mode field distribution of the output waveguide.
Referring to a cross-sectional view of the arrayed waveguide chip 1 shown in fig. 3, the arrayed waveguide chip 1 includes a core layer 11 and a cladding layer 12 wrapped around the core layer 11. Optionally, in order to ensure the light transmission quality and transmission efficiency of the arrayed waveguide chip 1, the core layer 11 is rectangular, and the range of the width to the height ratio of the rectangle is [3, 5 ]; the difference between the refractive index of the core layer 11 and the refractive index of the clad layer 12 was in the range of [ 0.75%, 2.5% ].
Optionally, the coupling manner of the arrayed waveguide chip 1 and the detector 2 includes, but is not limited to, the following:
first (refer to fig. 1): the normal direction of the light-emitting surface of the array waveguide chip 1 points to the photosensitive area of the detector 2. Optionally, the detector 2 is directly fixed on the light-emitting surface of the array waveguide chip 1; or, air is spaced between the detector 2 and the light-emitting surface of the array waveguide chip 1.
Second (refer to fig. 2): the array waveguide chip 1 is provided with a total reflection surface 13, and the total reflection surface 13 is used for totally reflecting the light transmitted in the array waveguide chip 1 to the upper surface 14 of the array waveguide chip 1 for emergence; the center of the photosensitive area of the detector 2 coincides with the output light field center of the upper surface 14. Referring to fig. 2, an optical signal (indicated by a dotted arrow) inside the arrayed waveguide chip 1 exits from the upper surface 14 after passing through the total reflection surface 13 of the arrayed waveguide chip 1, and is refracted at the interface between the arrayed waveguide chip 1 and the air layer, and then is directed to the center of the photosensitive area of the detector 2.
Alternatively, since the total reflection surface 13 has an angular shape, in order to prevent the problem that the detector 2 may contact with the total reflection surface 13 and cause damage when directly mounted on the upper surface 14, in the present embodiment, the arrayed waveguide chip 1 is supported by the support 4, so that the detector 2 is separated from the region of the upper surface 14 of the arrayed waveguide chip for emitting light by a predetermined distance.
Wherein, the total reflection surface 13 may be formed by polishing the end surface of the array waveguide chip 1; alternatively, the present embodiment does not limit the arrangement of the total reflection surface 13 by a mirror provided on the end surface of the arrayed waveguide chip 1.
Alternatively, the probe 2 and the amplifier 3 may be connected by gold wire bonding.
Optionally, the amplifier 3 may be a trans-impedance amplifier (TIA), and of course, may also be another type of amplifier, which is not limited in this embodiment.
In this embodiment, the photosensitive area of the detector 2 is determined based on the mode field distribution range of the output waveguide in a manner including: the photosensitive area of the detector 2 includes a mode field distribution range and the size of the photosensitive area is less than or equal to a size threshold.
Optionally, the photosensitive area of the detector 2 is greater than or equal to the mode field distribution range of the output waveguide.
Wherein the size threshold is determined based on the maximum detection bandwidth of the detector 2. Since the maximum detection bandwidth of the detector 2 is fixed, and the larger the photosensitive area of the detector 2 is, the smaller the corresponding bandwidth is, in order to ensure the maximum detection bandwidth requirement of the detector 2, the photosensitive area of the detector 2 is less than or equal to the size threshold in this embodiment.
Alternatively, referring to fig. 4, the mode field distribution range of the output waveguide is rectangular in shape, and accordingly, the photosensitive region of the detector is rectangular, and the width-to-height ratio of the rectangle of the photosensitive region is equal to the width-to-height ratio of the rectangle of the mode field distribution range. Such as: the ratio of the width to the height of the rectangle of the mode field distribution range is 2:1, and the ratio of the width to the height of the rectangle of the photosensitive area is 2: 1. At this time, the photosensitive region of the detector 2 can detect the mode field distribution of the output waveguide corresponding to each wavelength.
Alternatively, referring to fig. 5, the shape of the mode field distribution range is an ellipse, and accordingly, the photosensitive area of the detector is an ellipse, and the ratio of the major axis to the minor axis of the ellipse of the photosensitive area is equal to the ratio of the major axis to the minor axis of the ellipse of the mode field distribution range. Such as: the ratio of the major axis to the minor axis of the ellipse of the mode field distribution is 2:1, and the ratio of the major axis to the minor axis of the ellipse of the photosensitive area is also 2: 1. At this time, the photosensitive region of the detector 2 can detect the mode field distribution of the output waveguide corresponding to each wavelength.
In this embodiment, the size of the photosensitive region of the detector 2 is determined based on the size of the mode field distribution range of the output waveguide, and the size of the photosensitive region of the detector 2 does not need to be fixedly set as a size threshold, so that the detection accuracy can be ensured, the area of the photosensitive region of the detector 2 can be reduced in some scenes, and the maximum detection bandwidth of the detector 2 can be increased.
Of course, the planar waveguide chip-based light receiving engine provided in this embodiment may also have other components, such as: a substrate having an electrical function and a mechanical support function, etc., and the embodiments are not listed here.
In summary, in the light receiving engine based on the planar waveguide chip provided in this embodiment, the array waveguide chip for receiving the optical signal emitted by the optical fiber is disposed, the output waveguide of the array waveguide chip has a multimode waveguide structure, and the light is incident on the array waveguide chip and then output through the output waveguide; the mode field distribution of the light rays with different wavelengths corresponding to the output waveguide is different; a detector coupled to the array waveguide chip, a photosensitive area of the detector being determined based on a mode field distribution range of the output waveguide; and an amplifier connected to the detector; the problem of low coupling efficiency between the conventional array waveguide chip and a detector can be solved; due to the fact that the photosensitive area of the detector is optimized, the photosensitive area can be matched with a light spot mode field of the waveguide chip, and coupling efficiency is improved.
In addition, the photosensitive area of the detector in this embodiment includes the mode field distribution range of the output waveguide, and the size of the photosensitive area is smaller than or equal to the size threshold, so that the junction capacitance of the detector can be reduced, the matching degree with the mode field of the array waveguide chip can be enhanced, and the coupling efficiency can be improved; coupling tolerance is increased, accurate alignment installation is not needed, and installation difficulty is reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A planar waveguide chip based light receiving engine, comprising:
the array waveguide chip is used for receiving optical signals sent by optical fibers, an output waveguide of the array waveguide chip is provided with a multimode waveguide structure, and light is incident to the array waveguide chip and then is output through the output waveguide; the mode field distribution of the light rays with different wavelengths corresponding to the output waveguide is different;
a detector coupled to the array waveguide chip, a photosensitive area of the detector being determined based on a mode field distribution range of the output waveguide; and the number of the first and second groups,
an amplifier connected to the detector.
2. A light receiving engine as recited in claim 1, wherein a normal direction of the light exit surface of the arrayed waveguide chip is directed to the photosensitive area of the detector.
3. The optical receiving engine of claim 1, wherein the arrayed waveguide chip is formed with a total reflection surface for totally reflecting light transmitted in the arrayed waveguide chip to an upper surface of the arrayed waveguide chip to exit; the center of the photosensitive area of the detector coincides with the center of the output optical field of the upper surface.
4. The light receiving engine of claim 3, wherein the arrayed waveguide chip is supported by a support so that the detector is spaced apart from a region of the upper surface of the arrayed waveguide chip for emitting light by a predetermined distance.
5. A light receiving engine as recited in any one of claims 1-4, wherein a photosensitive region of the detector includes a mode field distribution of the output waveguide, and a size of the photosensitive region is less than or equal to a size threshold.
6. The light receiving engine of claim 5, wherein the mode field distribution range is rectangular in shape, and accordingly the photosensitive area of the detector is rectangular, and the width to height ratio of the rectangle of the photosensitive area is equal to the width to height ratio of the rectangle of the mode field distribution range.
7. The light receiving engine of claim 5, wherein the mode field distribution range is elliptical in shape, and accordingly the photosensitive area of the detector is elliptical, and the ratio of the major axis to the minor axis of the ellipse of the photosensitive area is equal to the ratio of the major axis to the minor axis of the ellipse of the mode field distribution range.
8. A light receiving engine as recited in any one of claims 1 to 4, wherein the probe is connected to the amplifier by gold wire bonding.
9. The light receiving engine of any one of claims 1 to 4, wherein the arrayed waveguide chip comprises a core layer and a cladding layer wrapped around the core layer, the core layer having a width to height ratio in the range [3, 5 ]; the difference between the refractive index of the core layer and the refractive index of the clad layer was in the range of [ 0.75%, 2.5% ].
10. The optical receiving engine of any of claims 1 to 4, wherein the amplifier is a transimpedance amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921429384.3U CN210442547U (en) | 2019-08-29 | 2019-08-29 | Light receiving engine based on planar waveguide chip |
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| CN201921429384.3U CN210442547U (en) | 2019-08-29 | 2019-08-29 | Light receiving engine based on planar waveguide chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426797A (en) * | 2019-08-29 | 2019-11-08 | 易锐光电科技(安徽)有限公司 | Light-receiving engine based on planar waveguide chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110426797A (en) * | 2019-08-29 | 2019-11-08 | 易锐光电科技(安徽)有限公司 | Light-receiving engine based on planar waveguide chip |
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