Light receiving end, 1.6 T DR8 light engine and coupling method

Abstract

The invention relates to a light receiving end, which is characterized in that an array lens for coupling emergent light of each channel of a 45-degree optical fiber array into a corresponding channel of an array detector chip is arranged between a 45-degree total reflection surface of a V-shaped groove in the 45-degree optical fiber array and the array detector chip, and the side surface of the array lens is fixed with the side surface of a cover plate in the 45-degree optical fiber array in a bonding manner. The invention discloses an optical receiving end coupling method. The method comprises the following steps of: aligning each channel of a 45-degree optical fiber array with each channel of an array detector chip one by one in an active coupling manner; the array lens is coupled between the 45-degree total reflection surface of the V-shaped groove in the 45-degree optical fiber array and the array detector chip in an active coupling manner, so that light emitted from each channel of the 45-degree optical fiber array is coupled into the corresponding channel of the array detector chip, and when the optimal coupling position is reached, glue dispensing is performed, and the light emitted from each channel of the 45-degree optical fiber array is obtained. And the side surface of the array lens is fixed with the side surface of the cover plate in the 45-degree optical fiber array. The beneficial effects are that the optical receiving end is optimal in performance, highest in yield and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of optical engines, and in particular 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-channel transmission and 8-channel reception, single-wavelength 200G. Its specific structure includes: a PCB board and an eight-channel optical fiber array fixed on the PCB board, eight optical transmitters and two optical receivers. The eight optical transmitters are distributed on the light-incoming side of the eight-channel optical fiber array and are coupled one by one with the eight channels of the eight-channel optical fiber array. Each optical transmitting end includes: a laser chip, a lens and an optical isolator coupled in sequence along the light propagation direction, the output light of the optical isolator is coupled into one of the channels of the eight-channel optical fiber array, and the laser chip has a single-wavelength of 200G; Each optical receiving end includes: a 45° optical fiber array, an array detector chip, a TIA chip, an array lens and a pad. The 45° optical fiber array, the array detector chip, the TIA chip and the pad are fixed on the PCB board respectively. An array lens is arranged between the 45° total reflection surface of the V groove in the 45° optical fiber array and the array detector chip to couple the light output from each channel of the 45° optical fiber array into the corresponding channel of the array detector chip. The bonding area reserved at the bottom of the array lens is fixed to the upper end surface of the pad by bonding. The array detector chip has four single-wavelength 200G chips, and the 45° optical fiber array adopts a four-channel 45° optical fiber array. The coupling method of the optical receiving end is: first fix the array detector chip and TIA chip on the corresponding position of the PCB board, then mount the pad, and then use a high-precision patch machine to align the array lens and the array detector chip by passive patch and mount them on the upper end surface of the pad. Finally, use active coupling to couple the 45° optical fiber array. The specific process is as shown in the attached figure. Figure 1 As shown; This type of optical receiver has the following defects: 1) The array lens adopts passive patching by high-precision patch machines. The precision required by high-precision patch machines is ±3um and the angle is ±0.5°. This type of high-precision patch machine is very expensive, resulting in high production costs for the 1.6T DR8 optical engine. 2) Since the array detector chip, gasket, array lens, 45° fiber array cover plate and V-groove all have thickness tolerances, usually ±10um, there will be cumulative tolerances in extreme cases, that is, the distance between the array detector chip, array lens and 45° fiber array fiber core may deviate from the optimal coupling distance, resulting in poor performance and reduced yield; 3) Since a bonding area must be reserved for bonding the bottom of the array lens to prevent glue from overflowing onto the light-transmitting surface of the array lens, the array lens area is very large, usually 1mm wide, so the cost is relatively high. Due to the large size of the array lens, the distance from the side of the cover plate to the V-groove is 1.17mm, resulting in low production yield and poor reliability of the 45° optical fiber array; 4) For a single-wavelength 200G chip, its photosensitive surface is small. Since the array lens is fixed on the pad, the focal length between the array lens and the array detector chip is fixed during the coupling process, which will result in low coupling responsiveness and low yield. Summary of the invention

[0003] 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 deficiencies in the above-mentioned prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: A light receiving end comprises: a 45° optical fiber array and an array detector chip. An array lens is arranged between the 45° total reflection surface of the V-groove in the 45° optical fiber array and the array detector chip to couple the light output from each channel of the 45° optical fiber array into the corresponding channel of the array detector chip. The side surface of the array lens is fixed to the side surface of a cover plate in the 45° optical fiber array by bonding.

[0005] The beneficial effects of the present invention are: 1) Since the side of the array lens is fixed to the side of the cover plate in the 45° optical fiber array by bonding, the distance between the array lens and the array detector chip can be adjusted during the coupling process, so that they can be coupled at the best position to avoid affecting the coupling responsivity and yield of the entire receiving end, that is, to obtain the best performance and the highest yield of the optical receiving end; 2) The side of the array lens is fixed to the side of the cover plate in the 45° optical fiber array by bonding, thereby eliminating the spacer and saving material costs; 3) Since the array lens does not use 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.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the side surface of the array lens and the side surface of the cover plate in the 45° optical fiber array are bonded and fixed by UV glue.

[0008] Furthermore, the array detector chip is electrically connected to the TIA chip.

[0009] Furthermore, the distance that the side surface of the cover plate used to fix the array lens is retreated from the V-groove is 0.44 mm.

[0010] The above method has the further beneficial effect of reducing the size by 0.73 mm compared with the prior art, thereby facilitating improving the manufacturing yield and reliability of the 45° optical fiber array.

[0011] Furthermore, the width of the array lens is 0.5 mm.

[0012] The further beneficial effect of adopting the above method is that the size is reduced by 0.5 mm compared with the prior art, and the size of the array lens is only half, so that the lens cost can be reduced by half.

[0013] Furthermore, the array detector chip has four single-wavelength 200G chips, and the 45° fiber array uses a four-channel 45° fiber array.

[0014] Based on the above technical solution, the present invention also provides a 1.6T DR8 optical engine, including: a PCB board and two light receiving ends, the two light receiving ends are distributed side by side on the PCB board, and the array detector chip of the light receiving end and the cover plate in the 45° optical fiber array are respectively fixed to the PCB board.

[0015] The above further beneficial effect is: effectively ensuring the performance and yield of the 1.6T DR8 light engine.

[0016] Furthermore, an eight-channel optical fiber array is arranged on the PCB board, and eight optical transmitters coupled with the eight-channel optical fiber array and fixed on the PCB board are arranged side by side on the light incident side, and the single-wavelength optical transmitter is 200G.

[0017] Furthermore, the optical transmitting end includes: a laser chip, a lens and an optical isolator coupled in sequence along the light propagation direction, and the output light of the optical isolator is coupled into one channel of the eight-channel optical fiber array.

[0018] Based on the above technical solution, the present invention also provides a light receiving end coupling method for coupling the above light receiving end, the steps are as follows: S100, fixing the array detector chip, and connecting each channel of the array detector chip to an external galvanometer, and then connecting each channel of the 45° optical fiber array to an external light source, turning on the galvanometer and the light source, aligning each channel of the 45° optical fiber array with each channel of the array detector chip one by one in an active coupling manner, and fixing the 45° optical fiber array; S200, couple the array lens between the 45° total reflection surface of the V-groove in the 45° optical fiber array and the array detector chip, so that the light output from each channel of the 45° optical fiber array is coupled into the corresponding channel of the array detector chip, and the optimal coupling position of the array lens is determined by observing the photocurrent of the ammeter, and when the array lens is in the optimal coupling position, glue is applied to fix the side of the array lens to the side of the cover plate in the 45° optical fiber array by bonding.

[0019] A further beneficial effect of adopting the above method is that the distance between the array lens and the array detector chip in this coupling mode 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 they can be coupled at the optimal position to avoid affecting the coupling responsiveness and yield of the entire receiving end, thereby obtaining the best performance and highest yield of the optical receiving end, and eliminating the need for expensive high-precision placement machines, effectively reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flow chart of coupling of the optical receiving end in the prior art 1.6T DR8 optical engine; Figure 2 is a structural diagram of the optical receiving end in the present invention; Figure 3 It is a partial structural diagram of a 45° optical fiber array in the present invention; Figure 4 is a structural diagram of the array lens in the present invention; Figure 5 It is a structural diagram of the 1.6T DR8 light engine in the present invention; Figure 6 This is a coupling flow chart of the optical receiving end in the 1.6T DR8 optical engine of the present invention.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Light receiving end, 110, 45° optical fiber 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 optical fiber array, 4, light transmitting end, 410, laser chip, 420, lens, 430, optical isolator. DETAILED DESCRIPTION

[0022] 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.

[0023] Example 1 like Figure 2As shown, a light receiving end includes: a 45° optical fiber array 110 and an array detector chip 120, 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, the array lens 130 is used to couple the light output from each channel of the 45° optical fiber array 110 into the corresponding channel of the array detector chip 120, and when the array lens 130 reaches an optimal position during the coupling process, 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; In the present invention, since the side of the array lens 130 is fixed to the side of the cover plate 112 in the 45° optical fiber array 110 by bonding, the distance between the array lens 130 and the array detector chip 120 is adjustable during the coupling process, so that they can be coupled at the best position to avoid affecting the coupling responsiveness and yield of the entire receiving end, that is, to obtain the best performance and the highest yield of the optical receiving end; The side of the array lens 130 is fixed to the side of the cover plate 112 in the 45° optical fiber array 110 by bonding, thereby eliminating the spacer and saving material costs; Since the array lens 130 does not use a bottom bonding method but a side bonding method, there is no need to reserve a bonding area at the bottom of the array lens 130, so that a small-sized array lens 130 can be used, effectively reducing costs.

[0024] Example 2 like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1, and the details are as follows: 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 preferably bonded and fixed using UV glue.

[0025] Example 3 like Figure 2 As shown, this embodiment is a further improvement on the basis of Embodiment 1 or 2, and the details are as follows: 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 .

[0026] Example 4 like Figure 2 , Figure 3 , Figure 4 As shown, this embodiment is a further improvement on any one of Embodiments 1 to 3, and the details are as follows: The distance that the side of the cover plate 112 used to fix the array lens 130 is set back 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 is set back from the V-groove 111 is reduced, which is beneficial to improving the manufacturing yield and reliability of the 45° optical fiber array 110. The distance that the side of the cover plate 112 used to fix the array lens 130 is set back from the V-groove 111 is preferably 0.44 mm, that is, the size is smaller than that of the prior art: 0.73 mm.

[0027] The width of the array lens 130 is less than 1 mm. Since the array lens 130 in this solution does not use a bottom bonding method, that is, no bonding area is reserved, but a side bonding method is used, the size of the array lens 130 is 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 smaller than that of the prior art: 0.5 mm, and the size of the array lens 130 is only half, so the lens cost can be reduced by half (array lenses generally use silicon lenses, and the cost of silicon lenses is related to the output quantity of a single wafer, and the quantity is related to the lens size, the smaller the cheaper).

[0028] Example 5 like Figure 2 , Figure 5 As shown, this embodiment is a further improvement on any one of Embodiments 1 to 4, and the details are as follows: The array detector chip 120 has four single-wavelength 200G chips, and the 45° optical fiber array 110 uses a four-channel 45° optical fiber array 110, that is, each optical receiving end 1 has four-way reception and is 800G (200G×4).

[0029] Example 6 like Figure 2 , Figure 5 As shown, a 1.6T DR8 optical engine includes: a PCB board 2 and two optical receiving ends 1 as in any one of embodiments 1 to 5, the two optical receiving ends 1 are distributed 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, and the TIA chip 140 of the optical receiving end 1 is fixed to the PCB board 2.

[0030] Furthermore, an eight-channel optical fiber array 3 is arranged on the PCB board 2, and eight optical transmitters 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 of the eight-channel optical fiber array 3, and the optical transmitter 4 has a single-wavelength of 200G.

[0031] In this embodiment, the light emitting end 4 includes: a laser chip 410, a lens 420 and an optical isolator 430 coupled in sequence 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 output light of the optical isolator 430 is coupled into one of the channels of the eight-channel optical fiber array 3.

[0032] Example 7 like Figure 6 As shown, a light receiving end coupling method is used to couple the light receiving end of any one of embodiments 1 to 5, and the steps are as follows: S100, fixing the array detector chip 120, which can be specifically understood as fixing the array detector chip 120 on the PCB board 2, connecting each channel of the array detector chip 120 to an external ammeter, and then connecting each channel of the 45° optical fiber array 110 to an external light source, turning on the ammeter and the light source, allowing each channel of the 45° optical fiber array 110 to be aligned one by one with each channel of the array detector chip 120 in an active coupling manner, and the light of each channel of the 45° optical fiber array 110 can be coupled into each channel of the array detector chip 120 respectively, and the array detector chip 120 converts it into photocurrent, and whether it is aligned one by one can be determined by observing the size of the photocurrent of each ammeter, and fixing the 45° optical fiber array 110, which can be specifically understood as fixing the 45° optical fiber array 110 on the PCB board 2; S200, couple 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 (during this operation, the array detector chip 120 is still externally connected to an ammeter, and the 45° optical fiber array 110 is still externally connected to a light source), so that the light output from each channel of the 45° optical fiber array 110 is coupled into the corresponding channel of the array detector chip 120, and the optimal coupling position of the array lens 130 is determined by observing the photocurrent of each ammeter. When the photocurrent value of each ammeter is the largest, it indicates that the array lens 130 is in the optimal coupling position, and when the array lens 130 is in the optimal coupling position, glue is applied to fix the side of the array lens 130 to the side of the cover plate 112 in the 45° optical fiber array 110 by bonding.

[0033] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary 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 (1) as claimed in any one of claims 1 to 6, wherein the two light receiving ends (1) are arranged side by side on the PCB board (2), and the array detector chip (120) of the light receiving end (1) 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.

Images