Low-cost 800G DR8 optical module

Abstract

The utility model relates to a low-cost 800G DR8 optical module, which is characterized in that at least one multichannel optical fiber array and at least one array detector chip are fixed on a PCB (Printed Circuit Board), and the end surface of the light emitting side of the multichannel optical fiber array is a 0-degree surface; each channel of one array detector chip distributed on the light emitting side of each multi-channel optical fiber array is aligned with each channel of the multi-channel optical fiber array one by one; and an integrated lens which is used for downwards turning emergent light of the multi-channel optical fiber array by 90 degrees and coupling the emergent light into the array detector chip is fixed on the 0-degree surface of the multi-channel optical fiber array in a bonding manner. The 800G DR8 optical module has the beneficial effects that the integrated lens can reach the optimal position by adopting an active coupling mode, the distance between the integrated lens and the array detector chip is adjustable, and the distance between the integrated lens and the multi-channel optical fiber array is also adjustable, so that the 800G DR8 optical module is optimal in performance and highest in yield, the integrated lens does not need to adopt a high-precision chip mounter for chip mounting, the cost is saved, and the production efficiency is improved. And a lens cushion block is omitted.

Description

Technical Field

[0001] The utility model relates to the technical field of optical modules, and in particular to a low-cost 800G DR8 optical module. Background Art

[0002] The traditional 800G DR8 optical module has 8 transmit channels and 8 receive channels, and includes at least a PCB board, on which at least one multi-channel optical fiber array is fixed, and the end face of the multi-channel optical fiber array on the light-emitting side is a 45-degree plane. An array detector chip and a lens spacer are fixed directly below the light-emitting side of each multi-channel optical fiber array on the PCB board. Each channel of an array detector chip distributed on the light-emitting side of each multi-channel optical fiber array is aligned one by one with each channel of the multi-channel optical fiber array. An array lens is arranged below the light-emitting side of each multi-channel optical fiber array to couple its output light into the array detector chip. The array lens is fixed to the lens spacer. To ensure the yield, the receiving end generally adopts the array lens + multi-channel optical fiber array method. This solution uses a passive patch method to align the array detector chip and the array lens, which has the following disadvantages:

[0003] 1) The array lens is mounted using an expensive high-precision mounter, requiring an accuracy of ±3μm and an angle of ±0.5°;

[0004] 2) The array detector chip, lens spacer, array lens, glass cover of the multi-channel fiber array, and V-groove of the multi-channel fiber array all have thickness tolerances. The tolerance is generally ±10μm. In extreme cases, the cumulative tolerance is large, that is, the distance between the array detector chip, array lens, and the fiber cores of each channel of the multi-channel fiber array may deviate from the optimal coupling distance, resulting in poor performance and low yield. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a low-cost 800G DR8 optical module to overcome the deficiencies in the above-mentioned prior art.

[0006] The utility model provides the following technical solutions to the above-mentioned technical problems: a low-cost 800G DR8 optical module, comprising: a PCB board, on which at least one multi-channel optical fiber array and at least one array detector chip are fixed. The end face of the multi-channel optical fiber array on the light-emitting side is a 0° face, and each channel of an array detector chip distributed on the light-emitting side of each multi-channel optical fiber array is aligned one by one with each channel of the multi-channel optical fiber array. An integrated lens is fixed on the 0° face of the multi-channel optical fiber array by bonding, which is used to deflect the light output from the multi-channel optical fiber array downward by 90° and couple it into the array detector chip.

[0007] The beneficial effects of the utility model are:

[0008] The 800G DR8 optical module can first use passive patching to align each channel of the multi-channel fiber array with each channel of the array detector chip on its light-emitting side. Then, active coupling is used to bond and fix the integrated lens to the 0° plane of the multi-channel fiber array, so that the light output from the multi-channel fiber array is turned downward 90° and coupled into the array detector chip. Since the integrated lens can be actively coupled to achieve the optimal position, its distance from the array detector chip and the multi-channel fiber array can be adjusted. This can achieve the best performance and the highest yield of the 800G DR8 optical module. The integrated lens does not need to be mounted using a high-precision mounter, saving the cost of high-precision lens mounters.

[0009] This solution eliminates the lens spacer, saving material costs. The integrated lens has a higher integration level and reduces the number of couplings compared to multiple separate lenses.

[0010] The end face of the multi-channel fiber optic array on the light-emitting side is a 0° face, which significantly reduces the cost compared to a 45° multi-channel fiber optic array and improves the manufacturing yield and reliability of the multi-channel fiber optic array.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the integrated lens is bonded to the 0° plane of the multi-channel optical fiber array using a light-transmitting UV adhesive.

[0013] Furthermore, the thickness of the light-transmitting UV adhesive layer between the integrated lens and the 0° plane of the multi-channel optical fiber array is 50 μm±10 μm.

[0014] A further beneficial effect of the above is that the adjustment position tolerance can be effectively absorbed.

[0015] Furthermore, the integrated lens includes: a 45° prism, the light incident surface of the 45° prism is distributed vertically and is a 0° surface, the light emitting surface of the 45° prism is distributed horizontally and is a 0° surface, the light incident surface of the 45° prism is bonded to the 0° surface of the multi-channel optical fiber array, and the light emitting surface of the 45° prism is integrated with an aspheric lens array.

[0016] Furthermore, a TIA chip that is gold-wire bonded to the array detector chip is fixed on the PCB board.

[0017] Furthermore, the multi-channel optical fiber array is a four-channel optical fiber array, two four-channel optical fiber arrays are fixed side by side on the PCB board along its width direction, the number of array detector chips is two, and the number of integrated lenses is two.

[0018] Furthermore, an eight-channel optical fiber array and eight optical emission ends coupled to the eight-channel optical fiber array are fixed on the PCB board.

[0019] Furthermore, the optical emitting end includes: a laser chip, a lens, and an optical isolator coupled in sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a partial structural diagram of an 800G DR8 optical module in the prior art;

[0021] Figure 2 Part of the structure of the 800G DR8 optical module in this utility model Figure 1 ;

[0022] Figure 3 Part of the structure of the 800G DR8 optical module in this utility model Figure 2 .

[0023] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0024] 1. PCB board, 2. Multi-channel fiber array, 3. Array detector chip, 4. Integrated lens, 410, 45° prism, 420, aspheric lens array, 5. Transparent UV adhesive, 6. TIA chip, 7. Eight-channel fiber array, 8. Optical isolator, 9. Lens, 10. Laser chip. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] Example 1

[0027] like Figure 2 、 Figure 3 As shown, a low-cost 800G DR8 optical module includes: a PCB board 1, on which is fixed at least one multi-channel optical fiber array 2 and at least one array detector chip 3. The end face of the multi-channel optical fiber array 2 on the light-emitting side is a 0° plane, and each multi-channel optical fiber array 2 is distributed on the light-emitting side of each multi-channel optical fiber array 2. Each channel of the array detector chip 3 distributed on the light-emitting side of each multi-channel optical fiber array 2 is aligned one-to-one with each channel of the multi-channel optical fiber array 2. An integrated lens 4 is fixed to the 0° plane of the multi-channel optical fiber array 2 by bonding. The light emitted from each channel of the multi-channel optical fiber array 2 is deflected downward by 90 degrees through the integrated lens 4 and coupled into the array detector chip 3 on the light-emitting side of the multi-channel optical fiber array 2.

[0028] The coupling method of this low-cost 800G DR8 optical module is as follows:

[0029] First, a passive patch method is used to align each channel of the multi-channel optical fiber array 2 with each channel of the array detector chip 3 on its light output side.

[0030] Then glue the light incident surface of the integrated lens 4;

[0031] Then, the light incident surface of the integrated lens 4 is bonded to the 0° surface of the multi-channel optical fiber array 2. The integrated lens 4 is actively coupled to achieve the optimal position. The distance between the integrated lens 4 and the array detector chip 3 is adjustable, and the distance between the integrated lens 4 and the multi-channel optical fiber array 2 is also adjustable.

[0032] The 800G DR8 optical module can first use a passive patch method to align each channel of the multi-channel fiber array 2 with each channel of the array detector chip 3 on its light-emitting side. Then, an active coupling method is used to bond and fix the integrated lens 4 to the 0° plane of the multi-channel fiber array 2, so that the light output from the multi-channel fiber array 2 is turned downward by 90° and coupled into the array detector chip 3. Since the integrated lens 4 can be actively coupled to reach the optimal position, its distance from the array detector chip 3 and the distance from the multi-channel fiber array 2 are adjustable. Therefore, the 800G DR8 optical module can achieve the best performance and the highest yield. The integrated lens 4 does not need to be mounted using a high-precision mounter, saving the cost of a high-precision lens mounter.

[0033] This solution eliminates the lens gasket, saving material costs, and adopts an integrated lens 4. Compared with multiple individual lenses, it has a higher degree of integration and reduces the number of couplings. The end face of the light-emitting side of the multi-channel optical fiber array 2 is a 0° face, which greatly reduces the cost compared to the 45° multi-channel optical fiber array 2 (grinding the 45° face takes a long time), thereby improving the production yield and reliability of the multi-channel optical fiber array 2.

[0034] Example 2

[0035] like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1, specifically as follows:

[0036] The integrated lens 4 is bonded to the 0° surface of the multi-channel optical fiber array 2 using a transparent UV adhesive 5. The transparent UV adhesive 5 does not affect light propagation. Furthermore, the thickness of the transparent UV adhesive 5 between the integrated lens 4 and the 0° surface of the multi-channel optical fiber array 2 is 50 μm ± 10 μm, which can effectively absorb the adjustment position tolerance.

[0037] Example 3

[0038] like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1 or 2, specifically as follows:

[0039] The integrated lens 4 includes: a 45° prism 410, the light incident surface of the 45° prism 410 is distributed vertically and is a 0° surface, the light exit surface of the 45° prism 410 is distributed horizontally and is a 0° surface, the light incident surface of the 45° prism 410 is bonded to the 0° surface of the multi-channel optical fiber array 2, and an aspheric lens array 420 is integrated on the light exit surface of the 45° prism 410. The light exiting each channel of the multi-channel optical fiber array 2 is reflected by the 45° prism 410 and turned downward by 90°, and coupled into the aspheric lens array 420, and then coupled into the array detector chip 3 on the light exit side of the multi-channel optical fiber array 2 by the aspheric lens array 420.

[0040] Example 4

[0041] like Figure 2 As shown, this embodiment is a further improvement on the basis of any one of the embodiments 1 to 3, and the details are as follows:

[0042] The TI A chip 6 which is gold-wire-bonded to the array detector chip 3 is fixed on the PCB board 1 .

[0043] Example 5

[0044] like Figure 3 As shown, this embodiment is a further improvement on the basis of any one of the embodiments 1 to 4, specifically as follows:

[0045] The multi-channel optical fiber array 2 is a four-channel optical fiber array. Two four-channel optical fiber arrays are fixed side by side on the PCB board 1 along its width direction. There are two array detector chips 3 and two integrated lenses 4.

[0046] Furthermore, an eight-channel optical fiber array 7 and eight light emitting ends are fixed on the PCB board 1. The eight light emitting ends are coupled one by one with the eight channels of the eight-channel optical fiber array 7, that is, the lasers emitted by the eight light emitting ends can be coupled into the eight channels of the eight-channel optical fiber array 7.

[0047] The light emission includes: a laser chip 10, a lens 9 and an optical isolator 8 coupled in sequence. The laser light emitted by each laser chip 10 is coupled into one channel of the eight-channel optical fiber array 7 after passing through a lens 9 and an optical isolator 8 in sequence.

[0048] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A low-cost 800G DR8 optical module, characterized by: include: A PCB board (1) is provided, wherein at least one multi-channel optical fiber array (2) and at least one array detector chip (3) are fixed on the PCB board (1), the end face of the light-emitting side of the multi-channel optical fiber array (2) being a 0° face, each channel of an array detector chip (3) distributed on the light-emitting side of each multi-channel optical fiber array (2) being aligned one by one with each channel of the multi-channel optical fiber array (2), and an integrated lens (4) for deflecting the light emitted by the multi-channel optical fiber array (2) downward by 90° and coupling it into the array detector chip (3) being fixed on the 0° face of the multi-channel optical fiber array (2) by bonding.

2. The low-cost 800G DR8 optical module according to claim 1, characterized in that: The integrated lens (4) is bonded to the 0° surface of the multi-channel optical fiber array (2) using a light-transmitting UV adhesive (5).

3. The low-cost 800G DR8 optical module according to claim 2, characterized in that: The thickness of the light-transmitting UV adhesive (5) layer between the integrated lens (4) and the 0° surface of the multi-channel optical fiber array (2) is 50 μm±10 μm.

4. The low-cost 800G DR8 optical module according to claim 1, characterized in that: The integrated lens (4) comprises: a 45° prism (410); a light incident surface of the 45° prism (410) is vertically distributed and is a 0° surface; a light exit surface of the 45° prism (410) is horizontally distributed and is a 0° surface; the light incident surface of the 45° prism (410) is bonded to the 0° surface of the multi-channel optical fiber array (2); and an aspheric lens array (420) is integrated on the light exit surface of the 45° prism (410).

5. The low-cost 800G DR8 optical module according to claim 1, characterized in that: A TIA chip (6) bonded with gold wires to the array detector chip (3) is fixed on the PCB board (1).

6. The low-cost 800G DR8 optical module according to claim 1, characterized in that: The multi-channel optical fiber array (2) is a four-channel optical fiber array, two four-channel optical fiber arrays are fixed side by side on the PCB board (1) along its width direction, the number of the array detector chips (3) is two, and the number of the integrated lenses (4) is two.

7. The low-cost 800G DR8 optical module according to claim 1, characterized in that: An eight-channel optical fiber array (7) and eight light emitting ends coupled to the eight-channel optical fiber array (7) are fixed on the PCB board (1).

8. The low-cost 800G DR8 optical module according to claim 7, characterized in that: The light emitting end comprises: a laser chip (10), a lens (9) and an optical isolator (8) coupled in sequence.

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