An optical receiving end, 1.6T DR8 optical engine and coupling method

Abstract

The present invention relates to an optical receiving end. An array lens for coupling the light emitted from each channel of a 45° fiber array into the corresponding channel of an array detector chip is arranged between the 45° total reflection surface of the V-groove in the 45° fiber array and the array detector chip. The side surface of the array lens is fixedly connected to the side surface of the cover plate in the 45° fiber array by bonding. An optical receiving end coupling method includes: aligning each channel of the 45° fiber array with each channel of the array detector chip in an active coupling manner; coupling the array lens between the 45° total reflection surface of the V-groove in the 45° fiber array and the array detector chip in an active coupling manner to couple the light emitted from each channel of the 45° fiber array into the corresponding channel of the array detector chip, and when the optimal coupling position is reached, applying glue to fix the side surface of the array lens to the side surface of the cover plate in the 45° fiber array. The beneficial effects are: the optical receiving end has good performance, high yield, and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of optical engines, and particularly relates to an optical receiving end, a 1.6T DR8 optical engine, and a coupling method. Background Art

[0002] The traditional 1.6T DR8 optical engine has 8 channels for transmission and 8 channels for reception, with a single wavelength of 200G. Its specific structure includes: a PCB board, an eight-channel fiber array fixed on the PCB board, eight optical transmitting ends, and two optical receiving ends. The eight optical transmitting ends are distributed on the light incident side of the eight-channel fiber array and are coupled to the eight channels of the eight-channel fiber array one by one;

[0003] Each optical transmitting end includes: a laser chip, a lens, and an optical isolator that are sequentially coupled along the light propagation direction. The light output from the optical isolator is coupled into one of the channels of the eight-channel fiber array, and the laser chip has a single wavelength of 200G;

[0004] Each optical receiving end includes: a 45° fiber array, an array detector chip, a TIA chip, an array lens, and a spacer. The 45° fiber array, the array detector chip, the TIA chip, and the spacer are respectively fixed on the PCB board. An array lens that couples the light output from each channel of the 45° fiber array into the corresponding channel of the array detector chip is arranged between the 45° total reflection surface of the V-groove in the 45° fiber array and the array detector chip. The bonding area reserved at the bottom of the array lens is fixed on the upper end surface of the spacer by bonding. The array detector chip has four single-wavelength 200G chips, and the 45° fiber array uses a four-channel 45° fiber array;

[0005] The coupling method of this optical receiving end is as follows: First, the array detector chip and the TIA chip are fixed at the corresponding positions on the PCB board, then the spacer is pasted, and then the array lens is aligned with the array detector chip and pasted on the upper end surface of the spacer by a passive pasting method using a high-precision mounter. Finally, the 45° fiber array is coupled by an active coupling method. The specific process is as shown in the appendix; Figure 1 as shown;

[0006] This type of optical receiving end has the following defects:

[0007] 1) The array lens is passively pasted by a high-precision mounter. The precision required by the high-precision mounter is ±3um and the angle is ±0.5°. This type of high-precision mounter is very expensive, resulting in a high production cost of the 1.6T DR8 optical engine;

[0008] 2) Since there are thickness tolerances for materials such as the array detector chip, spacer, array lens, cover plate of the 45° fiber optic array, and V-groove, usually with tolerances of ±10um respectively, there will be cumulative tolerances in extreme cases, that is, the distance between the array detector chip, the array lens, and the fiber cores of the 45° fiber optic array may deviate from the optimal coupling distance, resulting in poor performance and reduced yield.

[0009] 3) Since an adhesive bonding area needs to be reserved at the bottom of the array lens to prevent the glue from overflowing onto the light-transmitting surface of the array lens, the area of the array lens is very large, usually with a width of 1mm, so the cost is relatively high. Due to the large size of the array lens, the distance that the side of the cover plate retreats from the V-groove is 1.17mm, resulting in low production yield and poor reliability of the 45° fiber optic array.

[0010] 4) For a single-wave 200G chip, its photosensitive surface is small. Since the array lens is fixed on the spacer, the focal length between the array lens and the array detector chip is fixed during the coupling process, resulting in low coupling responsivity and low yield. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide an optical receiving end, a 1.6T DR8 optical engine, and a coupling method to overcome the above-mentioned deficiencies in the prior art.

[0012] The technical solution of the present invention to solve the above technical problems is as follows:

[0013] An optical receiving end includes: a 45° fiber optic array and an array detector chip. An array lens that couples the light output from each channel of the 45° fiber optic array into the corresponding channel of the array detector chip is arranged between the 45° total reflection surface of the V-groove in the 45° fiber optic array and the array detector chip. The side surface of the array lens is fixed to the side surface of the cover plate in the 45° fiber optic array by an adhesive bonding method.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1) Since the side surface of the array lens is fixed to the side surface of the cover plate in the 45° fiber optic array by an adhesive bonding method, during the coupling process, the distance between the array lens and the array detector chip can be adjusted, so that it can be coupled at the optimal position, thus avoiding affecting the coupling responsivity and yield of the entire receiving end, that is, making the optical receiving end have good performance and high yield.

[0016] 2) Fixing the side surface of the array lens to the side surface of the cover plate in the 45° fiber optic array by an adhesive bonding method can cancel the spacer and save material costs.

[0017] 3) Since the array lens does not adopt the bottom bonding method but the side bonding method, there is no need to reserve a bonding area at the bottom of the array lens, so a small-sized array lens can be used, effectively reducing costs.

[0018] Based on the above technical solutions, the present invention can be further improved as follows.

[0019] Further, the side of the array lens and the side of the cover plate in the 45° fiber optic array are adhesively fixed using UV glue.

[0020] Further, the array detector chip is electrically connected to the TIA chip.

[0021] Further, the distance by which the side of the cover plate used to fix the array lens retreats from the V-groove is 0.44 mm.

[0022] The beneficial effect of the above further improvement is that the size is reduced by 0.73 mm compared to the prior art, which is beneficial to improving the production yield and reliability of the 45° fiber optic array.

[0023] Further, the width of the array lens is 0.5 mm.

[0024] The beneficial effect of the above further improvement is that the size is reduced by 0.5 mm compared to the prior art, and the size of the array lens is only half, so the lens cost can be reduced by half.

[0025] Further, the array detector chip includes four single-wave 200G chips, and the 45° fiber optic array uses a four-channel 45° fiber optic array.

[0026] Based on the above technical solutions, the present invention also provides a 1.6T DR8 optical engine, including: a PCB board and two optical receiving ends, the two optical receiving ends are arranged side by side on the PCB board, and the array detector chip and the cover plate in the 45° fiber optic array of the optical receiving ends are respectively fixed to the PCB board.

[0027] The beneficial effect of the above further improvement is to effectively ensure the performance and production yield of the 1.6T DR8 optical engine.

[0028] Further, an eight-channel fiber optic array is arranged on the PCB board, and eight optical transmitting ends that are coupled to and fixed to the PCB board are arranged side by side on the light incident side of the eight-channel fiber optic array, and the optical transmitting ends are single-wave 200G.

[0029] Further, the optical transmitting end includes: a laser chip, a lens, and an optical isolator that are sequentially coupled along the light propagation direction, and the light output of the optical isolator is coupled into one of the channels of the eight-channel fiber optic array.

[0030] Based on the above technical solution, the present invention further provides an optical receiver coupling method for coupling the above optical receiver, and the steps are as follows:

[0031] S100. Fix the array detector chip, externally connect a galvanometer to each channel of the array detector chip, externally connect a light source to each channel of the 45° fiber array, turn on the galvanometer and the light source, align each channel of the 45° fiber array with each channel of the array detector chip in an active coupling manner, and fix the 45° fiber array;

[0032] S200. Couple the array lens between the 45° total reflection surface of the V-groove in the 45° fiber array and the array detector chip, so that the light output from each channel of the 45° fiber array is coupled into the corresponding channel of the array detector chip. Determine the optimal coupling position of the array lens by observing the magnitude of the photocurrent of the galvanometer. When the array lens is in the optimal coupling position, apply glue to fix the side surface of the array lens and the side surface of the cover plate in the 45° fiber array in a bonding manner.

[0033] The further beneficial effects of the above are as follows: In this coupling method, the distance between the array lens and the array detector chip is adjustable, that is, the focal length between the array lens and the array detector chip is in a non-fixed state during the coupling process, so that it can be coupled in the optimal position to avoid affecting the coupling response and yield of the entire receiver, that is, the performance and yield of the optical receiver are good, and there is no need for an expensive high-precision mounter, effectively reducing the production cost. Description of the Drawings

[0034] Figure 1 It is a coupling flow chart of the optical receiver in the existing 1.6T DR8 optical engine;

[0035] Figure 2 It is a structural diagram of the optical receiver in the present invention;

[0036] Figure 3 It is a partial structural diagram of the 45° fiber array in the present invention;

[0037] Figure 4 It is a structural diagram of the array lens in the present invention;

[0038] Figure 5 It is a structural diagram of the 1.6T DR8 optical engine in the present invention;

[0039] Figure 6 It is a coupling flow chart of the optical receiver in the 1.6T DR8 optical engine of the present invention.

[0040] In the drawings, the list of components represented by each reference numeral is as follows:

[0041] 1. Optical receiving end, 110. 45° fiber optic array, 111. V-groove, 1111. 45° total reflection surface, 112. Cover plate, 120. Array detector chip, 130. Array lens, 140. TIA chip, 2. PCB board, 3. Eight-channel fiber optic array, 4. Optical transmitting end, 410. Laser chip, 420. Lens, 430. Optical isolator. Detailed implementation manners

[0042] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0043] Embodiment 1

[0044] As Figure 2 shown, an optical receiving end includes: a 45° fiber optic array 110 and an array detector chip 120. An array lens 130 is arranged between the 45° total reflection surface 1111 of the V-groove 111 in the 45° fiber optic array 110 and the array detector chip 120. The array lens 130 is used to couple the light emitted from each channel of the 45° fiber optic array 110 into the corresponding channel of the array detector chip 120. During the coupling process, when the array lens 130 reaches the optimal position, the side surface of the array lens 130 is fixed to the side surface of the cover plate 112 in the 45° fiber optic array 110 by bonding.

[0045] In the present invention, since the side surface of the array lens 130 is fixed to the side surface of the cover plate 112 in the 45° fiber optic array 110 by bonding, during the coupling process, the distance between the array lens 130 and the array detector chip 120 can be adjusted, so that it can be coupled at the optimal position to avoid affecting the coupling response and yield of the entire receiving end, that is, the performance and yield of the optical receiving end are good.

[0046] Fix the side surface of the array lens 130 to the side surface of the cover plate 112 in the 45° fiber optic array 110 by bonding, so that the spacer can be cancelled and the material cost can be saved.

[0047] Since the array lens 130 does not adopt the bottom bonding method, but the side bonding method, the bonding area does not need to be reserved at the bottom of the array lens 130, so that a small-size array lens 130 can be used, effectively reducing the cost.

[0048] Embodiment 2

[0049] As Figure 2 shown, this embodiment is a further improvement on Embodiment 1, specifically as follows:

[0050] The side surface of the array lens 130 and the side surface of the cover plate 112 in the 45° fiber optic array 110 are preferably fixed by bonding with UV glue.

[0051] Example 3

[0052] As Figure 2 shown, this embodiment is a further improvement on the basis of Embodiment 1 or 2, specifically as follows:

[0053] The array detector chip 120 is electrically connected to the TIA chip 140, that is, the array detector chip 120 can transmit signals to the TIA chip 140.

[0054] Example 4

[0055] As Figure 2 , Figure 3 , Figure 4 shown, this embodiment is a further improvement on the basis of any one of Embodiments 1 to 3, specifically as follows:

[0056] The distance that the cover plate 112 is used to fix the side of the array lens 130 retreating from the V-groove 111 is less than 1.17 mm. That is, compared with the prior art, the distance that the side of the cover plate 112 retreats from the V-groove 111 is reduced, which is beneficial to improving the production yield and reliability of the 45° fiber optic array 110. The distance that the cover plate 112 is used to fix the side of the array lens 130 retreating from the V-groove 111 is preferably 0.44 mm, that is, the size is reduced by 0.73 mm compared with the prior art.

[0057] The width of the array lens 130 is less than 1 mm. Since the array lens 130 does not need to adopt the bottom bonding method in this solution, that is, there is no need to reserve the bonding area, but the side bonding method is adopted, so the size of the array lens 130 is also relatively reduced, which is beneficial to reducing costs. The width of the array lens 130 is preferably 0.5 mm, that is, the size is reduced by 0.5 mm compared with the prior art. The size of the array lens 130 is only half, so the lens cost can be reduced by half (the array lens generally uses a silicon lens, and the cost of the silicon lens is related to the number of single-wafer outputs. The number is related to the lens size, and the smaller the size, the cheaper it is).

[0058] Example 5

[0059] As Figure 2 , Figure 5 shown, this embodiment is a further improvement on the basis of any one of Embodiments 1 to 4, specifically as follows:

[0060] The array detector chip 120 is equipped with four single-wave 200G chips, and the 45° fiber optic array 110 adopts a four-channel 45° fiber optic array 110, that is, each optical receiving end 1 has four channels of reception, and is 800G (200G×4).

[0061] Example 6

[0062] As Figure 2 , Figure 5 shown, a 1.6T DR8 optical engine includes: a PCB board 2 and two optical receiving ends 1 as described in any one of Embodiments 1 to 5. The two optical receiving ends 1 are arranged side by side on the PCB board 2. The array detector chip 120 of the optical receiving end 1 is fixed to the PCB board 2. The cover plate 112 in the 45° optical fiber array 110 of the optical receiving end 1 is fixed to the PCB board 2. The TIA chip 140 of the optical receiving end 1 is fixed to the PCB board 2.

[0063] Furthermore, an eight-channel optical fiber array 3 is arranged on the PCB board 2. On the light-incident side of the eight-channel optical fiber array 3, eight optical transmitting ends 4 that are coupled to and fixed on the PCB board 2 are arranged side by side. The optical transmitting end 4 is single-wave 200G.

[0064] In this embodiment, the optical transmitting end 4 includes: a laser chip 410, a lens 420, and an optical isolator 430 that are sequentially coupled along the light propagation direction. The light beam emitted by the laser chip 410 is coupled into the optical isolator 430 through the lens 420, and the light output of the optical isolator 430 is coupled into one of the channels of the eight-channel optical fiber array 3.

[0065] Embodiment 7

[0066] As Figure 6 shown, an optical receiving end coupling method for coupling an optical receiving end as described in any one of Embodiments 1 to 5 includes the following steps:

[0067] S100. Fix the array detector chip 120. Specifically, it can be understood as fixing the array detector chip 120 on the PCB board 2, connecting a galvanometer to each channel of the array detector chip 120, connecting a light source to each channel of the 45° optical fiber array 110, turning on the galvanometer and the light source, and aligning each channel of the 45° optical fiber array 110 with each channel of the array detector chip 120 in an active coupling manner. The light of each channel of the 45° optical fiber array 110 can be respectively coupled into each channel of the array detector chip 120, and the array detector chip 120 converts it into photocurrent. By observing the magnitude of the photocurrent of each galvanometer, it can be determined whether they are aligned one by one, and then fix the 45° optical fiber array 110. Specifically, it can be understood as fixing the 45° optical fiber array 110 on the PCB board 2;

[0068] S200. Couple the array lens 130 between the 45° total reflection surface 1111 of the V-groove 111 in the 45° fiber array 110 and the array detector chip 120 (when performing this operation, the array detector chip 120 is still externally connected to a galvanometer, and the 45° fiber array 110 is still externally connected to a light source), so that the light emitted from each channel of the 45° fiber array 110 is coupled into the corresponding channel of the array detector chip 120. Determine the optimal coupling position of the array lens 130 by observing the magnitude of the photocurrent of each galvanometer. When the photocurrent value of each galvanometer is the largest, it indicates that the array lens 130 is in the optimal coupling position. When the array lens 130 is in the optimal coupling position, apply glue to fix the side surface of the array lens 130 to the side surface of the cover plate 112 in the 45° fiber array 110 in a bonding manner.

[0069] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A light receiving end, characterized in that: include: A 45° optical fiber array (110) and an array detector chip (120), wherein an array lens (130) is arranged between a 45° total reflection surface (1111) of a V-groove (111) in the 45° optical fiber array (110) and the array detector chip (120) to couple light output from each channel of the 45° optical fiber array (110) into a corresponding channel of the array detector chip (120), and a side surface of the array lens (130) is fixed to a side surface of a cover plate (112) in the 45° optical fiber array (110) by bonding.

2. An optical receiving end according to claim 1, characterized in that: The side surface of the array lens (130) and the side surface of the cover plate (112) in the 45° optical fiber array (110) are bonded and fixed using UV glue.

3. The optical receiving end according to claim 1, characterized in that: The array detector chip (120) is electrically connected to the TIA chip (140).

4. The optical receiving end according to claim 1, characterized in that: The distance that the side surface of the cover plate (112) used to fix the array lens (130) is set back from the V-groove (111) is 0.44 mm.

5. An optical receiving end according to claim 4, characterized in that: The width of the cover plate (112) and the array lens (130) is 0.5 mm.

6. An optical receiving end according to any one of claims 1 to 5, characterized in that: The array detector chip (120) has four single-wavelength 200G chips, and the 45° optical fiber array (110) adopts a four-channel 45° optical fiber array (110).

7. A 1.6T DR8 light engine, characterized in that: include: A PCB board (2) and two light receiving ends according to any one of claims 1 to 6, wherein the two light receiving ends are arranged side by side on the PCB board (2), and the array detector chip (120) of the light receiving end and the cover plate (112) in the 45° optical fiber array (110) are respectively fixed to the PCB board (2).

8. The 1.6T DR8 light engine according to claim 7, characterized in that: An eight-channel optical fiber array (3) is arranged on the PCB board (2); eight optical emission ends (4) coupled to the eight-channel optical fiber array (3) and fixed on the PCB board (2) are arranged side by side on the light incident side; the optical emission ends (4) are single-wave 200G.

9. The 1.6T DR8 light engine according to claim 8, characterized in that: The light emitting end (4) comprises: a laser chip (410), a lens (420) and an optical isolator (430) which are sequentially coupled along a light propagation direction, and output light of the optical isolator (430) is coupled into one of the channels of the eight-channel optical fiber array (3).

10. A light receiving end coupling method, characterized in that: For coupling the optical receiving end as claimed in any one of claims 1 to 6, the steps are as follows: S100, fixing the array detector chip (120), and externally connecting each channel of the array detector chip (120) to a current meter, and then externally connecting each channel of the 45° optical fiber array (110) to a light source, turning on the current meter and the light source, aligning each channel of the 45° optical fiber array (110) with each channel of the array detector chip (120) one by one in an active coupling manner, and fixing the 45° optical fiber array (110); S200, coupling the array lens (130) between the 45° total reflection surface (1111) of the V-groove (111) in the 45° optical fiber array (110) and the array detector chip (120) so that light output from each channel of the 45° optical fiber array (110) is coupled into the corresponding channel of the array detector chip (120), determining the optimal coupling position of the array lens (130) by observing the photocurrent of each ammeter, and applying glue when the array lens (130) is in the optimal coupling position so that the side surface of the array lens (130) is fixed to the side surface of the cover plate (112) in the 45° optical fiber array (110) by bonding.

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