An 800G 2×FR4 light engine

Abstract

The utility model relates to a kind of 800G 2xFR4 light engine, eight TX light-in fibers, two TX light-out fibers, two RX light-in fibers and eight RX light-out fibers in optical fiber array are respectively coupled with eight TX light-in waveguides, two TX light-out waveguides, two RX light-in waveguides and eight RX light-out waveguides of AWG chip same side, each TX light-out waveguide is coupled with four TX light-in waveguides;Each RX light-in waveguide is coupled with four RX light-out waveguides;Eight TX light-in fibers are coupled with light emission end after being accessed into TX optical fiber array, eight RX light-out fibers are accessed into one RX optical fiber array with four as a group, and four RX light-out fibers in each RX optical fiber array are coupled with one PD array respectively.Affirmative effect is: AWG chip area can be saved to the maximum extent, waste space is reduced, so that AWG chip cost is reduced by more than 70%, coupling time is saved.

Description

Technical Field

[0001] This utility model relates to the field of optical engine technology, specifically to an 800G 2×FR4 optical engine. Background Technology

[0002] The structure of a traditional 800G 2×FR4 optical engine is as follows: Figure 1 As shown, it includes: a PCB board and a TX-AWG chip (actually an AWG chip, TX is only for distinguishing uses) fixed on the PCB board, two RX-AWG chips (actually AWG chips, RX is only for distinguishing uses), an optical transmitter, two PD arrays, two TIA chips, and a DSP chip. The two TX output waveguides of the TX-AWG chip are coupled to a TX fiber array, and the eight TX input waveguides of the TX-AWG chip are coupled to the optical transmitter. The optical transmitter includes: eight EML chips, eight collimating lenses, and eight optical isolators. Each EML chip passes through a collimating lens and an optical isolator sequentially. Each EML chip is fixed on a ceramic heat sink and coupled to one TX input waveguide of the TX-AWG chip. The emitted light of each EML chip is coupled into one TX input waveguide of the TX-AWG chip after passing through a collimating lens and an optical isolator. The four RX output waveguides of each RX-AWG chip are coupled to a PD array. Each PD array is electrically connected to a TIA chip. The TIA chip is electrically connected to the PCB board. One RX input waveguide of each RX-AWG chip is coupled to an RX fiber array. The RX fibers of the two RX fiber arrays and the two TX fibers of the TX fiber array are each connected to an external LC adapter.

[0003] In this scheme, the RX optical path uses two AWG chips and the TX optical path uses one AWG chip. Each AWG chip is coupled to a fiber array, which requires coupling the AWG chip and fiber array three times, which is time-consuming and labor-intensive. Furthermore, due to the lens size (minimum 0.6mm) in the optical transmitter, the TX-AWG chip is too large, and most of the area of ​​the TX-AWG chip is not used for waveguides and is wasted. At the same time, the RX-AWG chip also wastes a lot of area. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an 800G 2×FR4 optical engine to overcome the shortcomings of the prior art.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: An 800G 2×FR4 optical engine includes an AWG chip and an optical fiber array. The eight TX input fibers, two TX output fibers, two RX input fibers, and eight RX output fibers in the optical fiber array are coupled to eight TX input waveguides, two TX output waveguides, two RX input waveguides, and eight RX output waveguides on the same side of the AWG chip, respectively. Each TX output waveguide is coupled to four TX input waveguides, and each RX input waveguide is coupled to four RX output waveguides. The pigtails of the eight TX input fibers are connected to the optical transmitter after entering the TX fiber array. The eight RX output fibers are connected to an RX fiber array in groups of four. The four RX output fibers in each RX fiber array are coupled to a PD array.

[0006] The beneficial effects of this utility model are: this solution uses only one AWG chip, and the AWG chip can be used for both the TX optical path and the RX optical path. This can save the AWG chip area to the greatest extent, reduce wasted space, reduce the cost of AWG chip by more than 70%, and only requires coupling of AWG chip-fiber array once, saving time and reducing costs.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, each PD array is electrically connected to a TIA chip, and the TIA chip is electrically connected to the PCB board.

[0009] Furthermore, the RX fiber array adopts a 42.5° fiber array.

[0010] The further beneficial effect of adopting the above is that the coupling of the PD array can use a common RX fiber array, which effectively reduces costs.

[0011] Furthermore, the optical channel spacing of the PD array is 0.25mm.

[0012] Furthermore, the optical transmitter includes eight EML chips. Each EML chip is coupled to a TX incoming optical fiber in the TX fiber array after passing through a collimating lens and an optical isolator in sequence. Each EML chip is fixed on a ceramic heat sink.

[0013] The further beneficial effect of adopting the above is that the coupling of the EML chip can use a common TX fiber array, which effectively reduces costs.

[0014] Furthermore, the eight TX input waveguides are divided into two groups of four, with the two TX output waveguides located between the two groups of TX input waveguides.

[0015] Furthermore, the eight RX output waveguides are divided into two groups of four, with the two RX input waveguides located between the two groups of RX output waveguides.

[0016] Furthermore, each TX output fiber and each RX input fiber is connected to an external LC adapter.

[0017] Furthermore, the AWG chip, TX fiber array, optical transmitter, RX fiber array, and PD array are respectively fixed on the PCB board, and the DSP chip is fixed on the PCB board. Attached Figure Description

[0018] Figure 1 This is a structural diagram of an 800G 2×FR4 optical engine in the prior art; Figure 2 This is a structural diagram of the 800G 2×FR4 optical engine in this utility model; Figure 3 This is a coupling diagram between the AWG chip and the fiber optic array. Figure 4 for Figure 2 A magnified view of a portion of the image.

[0019] The attached diagram lists the components represented by each number as follows: 1. AWG chip, 110. TX input waveguide, 120. TX output waveguide, 130. RX input waveguide, 140. RX output waveguide, 2. Fiber optic array, 210. TX input fiber, 220. TX output fiber, 230. RX input fiber, 240. RX output fiber, 3. TX fiber array, 4. Optical transmitter, 410. EML chip, 420. Collimating lens, 430. Optical isolator, 440. Ceramic heat sink, 5. RX fiber array, 6. PD array, 7. TIA chip, 8. PCB board, 9. LC adapter, 10. DSP chip. Detailed Implementation

[0020] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0021] Example 1 like Figure 2 , Figure 3 , Figure 4 As shown, an 800G 2×FR4 optical engine includes: AWG chip 1 and fiber array 2 The AWG chip 1 has eight TX input waveguides 110, two TX output waveguides 120, two RX input waveguides 130 and eight RX output waveguides 140 on the same side. Preferably, the eight TX input waveguides 110, two TX output waveguides 120, two RX input waveguides 130 and eight RX output waveguides 140 are equally spaced. The fiber array 2 has eight TX input optical fibers 210, two TX output optical fibers 220, two RX input optical fibers 230, and eight RX output optical fibers 240. Since the eight TX input waveguides 110, two TX output waveguides 120, two RX input waveguides 130, and eight RX output waveguides 140 are preferably distributed at equal intervals, the eight TX input optical fibers 210, two TX output optical fibers 220, two RX input optical fibers 230, and eight RX output optical fibers 240 can also be distributed at equal intervals. The eight TX input optical fibers 210 in the fiber array 2 are coupled to the eight TX input waveguides 110 of the AWG chip 1, and the two TX output optical fibers 220 in the fiber array 2 are coupled to the two TX output waveguides 120 of the AWG chip 1. Each TX output waveguide 120 is coupled to four TX input waveguides 110. This can be understood as follows: one of the two TX output waveguides 120 is coupled to four of the eight TX input waveguides 110, and the other of the two TX output waveguides 120 is coupled to the other four of the eight TX input waveguides 110. Each RX input waveguide 130 is coupled to four RX output waveguides 140. This can be understood as follows: one of the two RX input waveguides 130 is coupled to four of the eight RX output waveguides 140, and the other of the two RX input waveguides 130 is coupled to the other four of the eight RX output waveguides 140. The pigtails of the eight TX input optical fibers 210 are connected to the TX fiber array 3 and then coupled to the optical transmitter 4; the eight RX output optical fibers 240 are connected to an RX fiber array 5 in groups of four. That is to say, the pigtails of four of the eight RX output optical fibers 240 are connected to an RX fiber array 5, and the pigtails of the other four RX output optical fibers 240 are connected to another RX fiber array 5. Each of the four RX output fibers 240 in each RX fiber array 5 is coupled to one PD array 6. Since there are two RX fiber arrays 5, there are two PD arrays 6. In this scheme, only the RX fiber arrays 5 with the corresponding spacing need to be replaced to couple the PD arrays 6 with the same spacing, such as 0.25mm, 0.5mm, and 0.75mm, which is very flexible. For the TX optical path, the emitted light from the optical transmitter 4 is coupled into a TX input optical fiber 210 in the TX fiber array 3, and then coupled into a TX input waveguide 110 of the AWG chip 1, and then coupled into the TX output waveguide 120, and finally coupled into the TX output optical fiber 220 through the TX output waveguide 120. For the RX optical path, the RX light is coupled into the RX input waveguide 130 of the AWG chip 1 via the RX input fiber 230, then coupled into the RX output waveguide 140 via the RX input waveguide 130, then coupled into the RX output fiber 240 via the RX output waveguide 140, and finally coupled into the PD array 6 via the RX output fiber 240.

[0022] This solution uses only one AWG chip 1, which can be used for both the TX and RX optical paths. This maximizes the saving of AWG chip area and reduces wasted space, resulting in a cost reduction of over 70% for AWG chip 1. Furthermore, it only requires one coupling between the AWG chip and the fiber array, saving time and reducing costs.

[0023] Example 2 like Figure 2 , Figure 4 As shown, this embodiment is a further improvement on embodiment 1, as detailed below: Each PD array 6 is electrically connected to a TIA chip 7, and the TIA chip 7 is electrically connected to the PCB board 8. Since there are two PD arrays 6, there are two TIA chips 7. The PD array 6 converts the optical signal into an electrical signal and transmits it to the TIA chip 7.

[0024] Furthermore, the RX fiber array 5 uses a 42.5° fiber array, and the optical channel spacing of the PD array 6 is 0.25mm.

[0025] Example 3 like Figure 2 , Figure 4 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below: The optical transmitter 4 includes eight EML chips 410, eight collimating lenses 420, and eight optical isolators 430. Each EML chip 410 is coupled to a TX incoming optical fiber 210 in the TX fiber array 3 after passing through a collimating lens 420 and an optical isolator 430 in sequence. Each EML chip 410 is fixed on a ceramic heat sink 440. The emitted light of each EML chip 410 is coupled into a TX incoming optical fiber 210 in the TX fiber array 3 after passing through a collimating lens 420 and an optical isolator 430 in sequence.

[0026] Example 4 like Figure 2 , Figure 3 As shown, this embodiment is a further improvement on embodiment 1, 2, or 3, as detailed below: The eight TX incoming waveguides 110 are divided into two groups of four, while the two TX outgoing waveguides 120 are located between the two groups of TX incoming waveguides 110.

[0027] Furthermore, the eight RX output waveguides 140 are divided into two groups of four, while the two RX input waveguides 130 are located between the two groups of RX output waveguides 140.

[0028] Example 5 like Figure 2 As shown, this embodiment is a further improvement on embodiment 1, 2, 3, or 4, as detailed below: Each TX output fiber 220 and each RX input fiber 230 is connected to an external LC adapter 9. Since there are two TX output fibers 220 and two RX input fibers 230, the number of LC adapters 9 is four.

[0029] Example 6 like Figure 2 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below: The AWG chip 1, TX fiber array 3, optical transmitter 4, RX fiber array 5 and PD array 6 are fixed on the PCB board 8, and the DSP chip 10 is fixed on the PCB board 8.

[0030] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An 800G 2×FR4 optical engine, characterized in that, include: The AWG chip (1) and the fiber array (2), wherein the eight TX input fibers (210), two TX output fibers (220), two RX input fibers (230) and eight RX output fibers (240) in the fiber array (2) are respectively coupled to eight TX input waveguides (110), two TX output waveguides (120), two RX input waveguides (130) and eight RX output waveguides (140) on the same side of the AWG chip (1), and each TX output waveguide (240) is coupled to the eight TX input waveguides (110), two TX output waveguides (120), two RX input waveguides (130) and eight RX output waveguides (140) on the same side of the AWG chip (1). Each of the eight TX input optical fibers (210) is coupled to four TX input waveguides (110), and each RX input waveguide (130) is coupled to four RX output waveguides (140). The pigtails of the eight TX input optical fibers (210) are connected to the TX fiber array (3) and then coupled to the optical transmitter (4). The eight RX output optical fibers (240) are connected to an RX fiber array (5) in groups of four. The four RX output optical fibers (240) in each RX fiber array (5) are coupled to a PD array (6).

2. The 800G 2×FR4 optical engine according to claim 1, characterized in that, Each PD array (6) is electrically connected to a TIA chip (7), which is electrically connected to a PCB board (8).

3. The 800G 2×FR4 optical engine according to claim 1, characterized in that, The RX fiber array (5) is a 42.5° fiber array.

4. The 800G 2×FR4 optical engine according to claim 1, characterized in that, The optical channel spacing of the PD array (6) is 0.25 mm.

5. An 800G 2×FR4 optical engine according to claim 1, characterized in that, The optical transmitter (4) includes eight EML chips (410), each EML chip (410) is coupled to a TX incoming optical fiber (210) in the TX fiber array (3) after passing through a collimating lens (420) and an optical isolator (430) in sequence, and each EML chip (410) is fixed on a ceramic heat sink (440).

6. An 800G 2×FR4 optical engine according to claim 1, characterized in that, The eight TX input waveguides (110) are divided into two groups of four, and the two TX output waveguides (120) are located between the two groups of TX input waveguides (110).

7. An 800G 2×FR4 optical engine according to claim 1, characterized in that, The eight RX output waveguides (140) are divided into two groups of four, and the two RX input waveguides (130) are located between the two groups of RX output waveguides (140).

8. An 800G 2×FR4 optical engine according to claim 1, characterized in that, Each TX output fiber (220) and each RX input fiber (230) is connected to an external LC adapter (9).

9. An 800G 2×FR4 optical engine according to any one of claims 1 to 8, characterized in that, The AWG chip (1), TX fiber array (3), optical transmitter (4), RX fiber array (5) and PD array (6) are respectively fixed on the PCB board (8), and the DSP chip (10) is fixed on the PCB board (8).

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