DR8 silicon optical chip compatible with multiple duplex optical isolators and 800G optical engine

Abstract

The invention relates to a DR8 silicon optical chip compatible with various duplex optical isolators. The emergent light of a first input waveguide and the emergent light of a second input waveguide are respectively divided into four paths in an equal ratio form and then are respectively coupled with four output waveguides in eight output waveguides; emergent light of the third input waveguide and emergent light of the fourth input waveguide are respectively divided into four paths in an equal ratio mode and then are respectively coupled with the other four output waveguides, the distance between the first input waveguide and the second input waveguide is 0.25 mm, the distance between the second input waveguide and the third input waveguide is 1mm, and the distance between the third input waveguide and the fourth input waveguide is 0.25 mm. The 800G optical engine comprises the DR8 silicon optical chip. The beneficial effects are that the same DR8 silicon optical chip can be compatible with duplex optical isolators of three sizes, so that the duplex optical isolators can be flexibly prepared, and production halt caused by material shortage of a duplex optical isolator of a certain size can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of optical engines, and particularly relates to a DR8 silicon photonics chip compatible with multiple dual optical isolators and an 800G optical engine. Background Art

[0002] Traditional DR8 silicon photonics chips include: two input waveguides and eight output waveguides. The light output from one of the two input waveguides is equally divided into four paths and then coupled to four of the eight output waveguides respectively, and the light output from the other input waveguide is equally divided into four paths and then coupled to the other four of the eight output waveguides respectively. The specific implementation method is as follows: Each input waveguide is coupled to the input of a first 1×2 optical splitter respectively. The two outputs of each first 1×2 optical splitter are respectively coupled to the inputs of two second 1×2 optical splitters. The eight outputs of the four second 1×2 optical splitters are each coupled to one of the eight output waveguides through an MZM modulator. In the industry, there are three sizes for the spacing between the two input waveguides of DR8 silicon photonics chips, which are 1mm, 1.25mm, and 1.5mm respectively (since the minimum size of the lens is 0.6mm, and a glue overflow space of 0.4mm needs to be left between two lenses, so the minimum size is 1mm, and basically the range of 1mm to 2mm can cover all, 2mm is the maximum size limit because it is too large to place, usually the maximum is 1.5mm, so there are usually only three sizes of 1mm, 1.25mm, and 1.5mm), thus corresponding to 3 types of DR8 silicon photonics chips;

[0003] When a DR8 silicon photonics chip is applied to an optical engine, the structure of the optical engine includes: two laser chips, two collimating lenses, a dual optical isolator, two focusing lenses, a multi-channel fiber array, and a DR8 silicon photonics chip. Each of the two laser chips is coupled to the same dual optical isolator through a collimating lens. A focusing lens is coupled between the dual optical isolator and each input waveguide of the DR8 silicon photonics chip. The eight output waveguides of the DR8 silicon photonics chip are coupled to the multi-channel fiber array. The specific structure is as Figure 1 、 Figure 2 、 Figure 3 shown. Since there are 3 sizes for the spacing between the two input waveguides in this type of DR8 silicon photonics chip, and different sizes of dual optical isolators can only correspond to one type of DR8 silicon photonics chip, there are 3 sizes of dual optical isolators to be compatible with DR8 silicon photonics chips with different spacings (since the optical isolator has magnetism, generally two independent optical isolators are not used, otherwise the two independent optical isolators will repel each other due to the magnetic force during chip mounting). For production enterprises, when there are shortages of mutually matching DR8 silicon photonics chips and dual optical isolators, it will lead to difficulties in preparing materials for the production line and even cause the production line to stop production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a DR8 silicon optical chip and an 800G optical engine that are compatible with multiple dual optical isolators, so as to overcome the deficiencies in the above-mentioned prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A DR8 silicon optical chip compatible with multiple dual optical isolators has a first input waveguide, a second input waveguide, a third input waveguide, and a fourth input waveguide sequentially distributed on the same side. The light output from the first input waveguide and the second input waveguide is each divided into four paths in a geometric progression and then coupled to four of the eight output waveguides respectively. The light output from the third input waveguide and the fourth input waveguide is each divided into four paths in a geometric progression and then coupled to the other four output waveguides respectively. The distance between the first input waveguide and the second input waveguide is 0.25 mm, the distance between the second input waveguide and the third input waveguide is 1 mm, and the distance between the third input waveguide and the fourth input waveguide is 0.25 mm.

[0007] The beneficial effects of the present invention are:

[0008] When the DR8 silicon optical chip is applied to an optical engine and coupled with a dual optical isolator, the following combination situations can occur:

[0009] Select the second input waveguide and the third input waveguide as the two input waveguides of the DR8 silicon optical chip. Since the distance between the second input waveguide and the third input waveguide is 1 mm, then at this time the DR8 silicon optical chip can be compatible with a dual optical isolator with a 1 mm spacing;

[0010] Select the first input waveguide and the third input waveguide as the two input waveguides of the DR8 silicon optical chip. Since the distance between the first input waveguide and the third input waveguide is 1.25 mm, then at this time the DR8 silicon optical chip can be compatible with a dual optical isolator with a 1.25 mm spacing;

[0011] Select the second input waveguide and the fourth input waveguide as the two input waveguides of the DR8 silicon optical chip. Since the distance between the second input waveguide and the fourth input waveguide is 1.25 mm, then at this time the DR8 silicon optical chip can be compatible with a dual optical isolator with a 1.25 mm spacing;

[0012] Select the first input waveguide and the fourth input waveguide as the two input waveguides of the DR8 silicon optical chip. Since the distance between the first input waveguide and the fourth input waveguide is 1.5 mm, then at this time the DR8 silicon optical chip can be compatible with a dual optical isolator with a 1.5 mm spacing;

[0013] The same DR8 silicon photonics chip can be compatible with three sizes of dual optical isolators, enabling the flexible stocking of dual optical isolators and preventing production stoppages due to shortages of a particular size of dual optical isolator.

[0014] Based on the above technical solution, the present invention can be further improved as follows.

[0015] Further, the first input waveguide, the second input waveguide, the third input waveguide, and the fourth input waveguide are distributed at 0 degrees.

[0016] The beneficial effect of the above is that when subsequently mounting the laser chip, the laser chip can be mounted at 0 degrees, facilitating the mounting. And when subsequently coupling the lens, the lens can be coupled at 0 degrees, facilitating the coupling.

[0017] Further, the output waveguides are distributed obliquely, and the eight output waveguides are parallel to each other.

[0018] The beneficial effect of the above is that the oblique distribution of the output waveguides can solve the problem of optical reflection.

[0019] Further, the tilt angle of the output waveguide is 8° ± 0.1°.

[0020] Further, the first input waveguide, the second input waveguide, the third input waveguide, the fourth input waveguide, and the output waveguide are on the same side.

[0021] Further, the first input waveguide and the second input waveguide are respectively coupled to two inputs of a first 2×2 optical splitter. The two outputs of the first 2×2 optical splitter are respectively coupled to the inputs of two first 1×2 optical splitters. Each of the four outputs of the two first 1×2 optical splitters is coupled to one of the four output waveguides among the eight output waveguides through an MZM modulator.

[0022] Further, the third input waveguide and the fourth input waveguide are respectively coupled to two inputs of a second 2×2 optical splitter. The two outputs of the second 2×2 optical splitter are respectively coupled to the inputs of two second 1×2 optical splitters. Each of the four outputs of the two second 1×2 optical splitters is coupled to one of the other four output waveguides among the eight output waveguides through an MZM modulator.

[0023] Based on the above technical solution, the present invention also provides an 800G optical engine, including: a DR8 silicon photonics chip, where the first input waveguide and the fourth input waveguide are respectively coupled to a dual optical isolator, or the first input waveguide and the third input waveguide are respectively coupled to a dual optical isolator, or the second input waveguide and the third input waveguide are respectively coupled to a dual optical isolator, or the second input waveguide and the fourth input waveguide are respectively coupled to a dual optical isolator.

[0024] The further beneficial effects are as follows: the same DR8 silicon photonics chip can be compatible with three sizes of dual optical isolators, enabling flexible material preparation for the dual optical isolators and preventing production stoppages due to shortages of a certain size of dual optical isolators.

[0025] Furthermore, two laser chips are coupled to the light input side of the dual optical isolator, and a collimating lens is coupled between each laser chip and the dual optical isolator;

[0026] A converging lens is coupled between the second input waveguide and the dual optical isolator, and a converging lens is coupled between the third input waveguide and the dual optical isolator;

[0027] Or, a converging lens is coupled between the first input waveguide and the dual optical isolator, and a converging lens is coupled between the third input waveguide and the dual optical isolator;

[0028] Or, a converging lens is coupled between the second input waveguide and the dual optical isolator, and a converging lens is coupled between the fourth input waveguide and the dual optical isolator;

[0029] Or, a converging lens is coupled between the first input waveguide and the dual optical isolator, and a converging lens is coupled between the fourth input waveguide and the dual optical isolator.

[0030] Furthermore, the eight output waveguides of the DR8 silicon photonics chip are coupled to a multi-channel fiber array. Description of the Drawings

[0031] Figure 1 Structural diagram of an 800G optical engine assembled with a DR8 silicon photonics chip with an input waveguide spacing of 1 mm in the prior art;

[0032] Figure 2 Structural diagram of an 800G optical engine assembled with a DR8 silicon photonics chip with an input waveguide spacing of 1.25 mm in the prior art;

[0033] Figure 3 Structural diagram of an 800G optical engine assembled with a DR8 silicon photonics chip with an input waveguide spacing of 1.5 mm in the prior art;

[0034] Figure 4 Structural diagram of a DR8 silicon photonics chip compatible with multiple dual optical isolators in the present invention;

[0035] Figure 5 Structural diagram of an 800G optical engine assembled by selecting the second and third input waveguides of a DR8 silicon photonics chip as the two input waveguides in the present invention;

[0036] Figure 6The structural diagram of an 800G optical engine assembled by selecting the first and third input waveguides of a DR8 silicon photonics chip as two input waveguides in the present invention;

[0037] Figure 7 The structural diagram of an 800G optical engine assembled by selecting the second and fourth input waveguides of a DR8 silicon photonics chip as two input waveguides in the present invention;

[0038] Figure 8 The structural diagram of an 800G optical engine assembled by selecting the first and fourth input waveguides of a DR8 silicon photonics chip as two input waveguides in the present invention.

[0039] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0040] 1. DR8 silicon photonics chip, 101. First input waveguide, 102. Second input waveguide, 103. Third input waveguide, 104. Fourth input waveguide, 105. Output waveguide, 106. First 2×2 optical splitter, 107. First 1×2 optical splitter, 108. MZM modulator, 109. Second 2×2 optical splitter, 110. Second 1×2 optical splitter, 2. Dual optical isolator, 3. Laser chip, 4. Collimating lens, 5. Focusing lens, 6. Multichannel fiber array. Detailed implementation manners

[0041] The principles and features of the present invention will be described below with reference to the attached drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0042] Example 1

[0043] As Figure 4 shown, a DR8 silicon photonics chip compatible with multiple dual optical isolators has a first input waveguide 101, a second input waveguide 102, a third input waveguide 103, and a fourth input waveguide 104 on the same side, and the first input waveguide 101, the second input waveguide 102, the third input waveguide 103, and the fourth input waveguide 104 are arranged in sequence. The light output from the first input waveguide 101 and the second input waveguide 102 is each divided into four paths in an equal ratio and then coupled to four of the eight output waveguides 105 respectively. The light output from the third input waveguide 103 and the fourth input waveguide 104 is each divided into four paths in an equal ratio and then coupled to the other four of the eight output waveguides 105 respectively. The distance between the first input waveguide 101 and the second input waveguide 102 is 0.25 mm, the distance between the second input waveguide 102 and the third input waveguide 103 is 1 mm, and the distance between the third input waveguide 103 and the fourth input waveguide 104 is 0.25 mm. When this DR8 silicon photonics chip is applied to an optical engine and coupled with a dual optical isolator, the following combination situations can occur:

[0044] ①. Select the second input waveguide 102 and the third input waveguide 103 as the two input waveguides of the DR8 silicon photonics chip 1. Since the spacing between the second input waveguide 102 and the third input waveguide 103 is 1 mm, at this time, the DR8 silicon photonics chip 1 can be compatible with the dual optical isolator 2 with a 1 mm spacing;

[0045] ②. Select the first input waveguide 101 and the third input waveguide 103 as the two input waveguides of the DR8 silicon photonics chip 1. Since the spacing between the first input waveguide 101 and the third input waveguide 103 is 1.25 mm, at this time, the DR8 silicon photonics chip 1 can be compatible with the dual optical isolator 2 with a 1.25 mm spacing;

[0046] ③. Select the second input waveguide 102 and the fourth input waveguide 104 as the two input waveguides of the DR8 silicon photonics chip 1. Since the spacing between the second input waveguide 102 and the fourth input waveguide 104 is 1.25 mm, at this time, the DR8 silicon photonics chip 1 can be compatible with the dual optical isolator 2 with a 1.25 mm spacing;

[0047] ④. Select the first input waveguide 101 and the fourth input waveguide 104 as the two input waveguides of the DR8 silicon photonics chip 1. Since the spacing between the first input waveguide 101 and the fourth input waveguide 104 is 1.5 mm, at this time, the DR8 silicon photonics chip 1 can be compatible with the dual optical isolator 2 with a 1.5 mm spacing;

[0048] So that the same DR8 silicon photonics chip 1 can be compatible with dual optical isolators 2 of 3 sizes, enabling the dual optical isolator 2 to be stocked flexibly and preventing production stoppages due to shortages of a certain size of dual optical isolator 2.

[0049] In the actual production process, if the extreme size of 2 mm is selected, then it does not rule out designing the spacing between the first input waveguide 101 and the second input waveguide 102 to be 0.5 mm, the spacing between the second input waveguide 102 and the third input waveguide 103 to be 1 mm, and the spacing between the third input waveguide 103 and the fourth input waveguide 104 to be 0.5 mm. At this time, the chip can be compatible with dual optical isolators 2 with 1 mm, 1.5 mm, and 2 mm spacings. The specific analysis is similar to the above description and will not be elaborated here in detail.

[0050] Embodiment 2

[0051] As Figure 4 shown, this embodiment is a further improvement on Embodiment 1, specifically as follows:

[0052] The first input waveguide 101, the second input waveguide 102, the third input waveguide 103, and the fourth input waveguide 104 are distributed at 0 degrees. When the subsequent patch laser chip 3 is being processed, the laser chip 3 can be patched at 0 degrees, which facilitates patching. And when the subsequent coupling lens is being processed, the lens can be coupled at 0 degrees, which facilitates coupling.

[0053] Embodiment 3

[0054] As Figure 4 shown, this embodiment is a further improvement based on Embodiment 1 or 2, and is specifically as follows:

[0055] The output waveguide 105 is inclinedly distributed, and the eight output waveguides 105 are parallel to each other. The inclined distribution of the output waveguide 105 can solve the problem of light reflection. Generally, the inclination angle of the output waveguide 105 is 8° ± 0.1°.

[0056] Furthermore, the first input waveguide 101, the second input waveguide 102, the third input waveguide 103, the fourth input waveguide 104, and the output waveguide 105 are on the same side.

[0057] Embodiment 4

[0058] As Figure 4 shown, this embodiment is a further improvement based on Embodiment 1 or 2 or 3, and is specifically as follows:

[0059] The first input waveguide 101 is coupled to one of the two inputs of the first 2×2 optical splitter 106, while the second input waveguide 102 is coupled to the other of the two inputs of the first 2×2 optical splitter 106. One of the two outputs of the first 2×2 optical splitter 106 is coupled to the input of one first 1×2 optical splitter 107, and the other of the two outputs of the first 2×2 optical splitter 106 is coupled to the input of the other first 1×2 optical splitter 107. That is, there are two first 1×2 optical splitters 107. The four outputs in total of the two first 1×2 optical splitters 107 are each coupled to four of the eight output waveguides 105 through an MZM modulator 108 one by one. The first 2×2 optical splitter 106 and the first 1×2 optical splitter 107 both split light in equal proportion. Finally, it is realized that: the light output from the first input waveguide 101 is equally divided into four paths and then coupled to four of the eight output waveguides 105 respectively, and the light output from the second input waveguide 102 is equally divided into four paths and then coupled to four of the eight output waveguides 105 respectively.

[0060] Further, the third input waveguide 103 is coupled to one of the two inputs of a second 2×2 optical splitter 109, and the fourth input waveguide 104 is coupled to the other input of the two inputs of the second 2×2 optical splitter 109. One of the two outputs of the second 2×2 optical splitter 109 is coupled to the input of a second 1×2 optical splitter 110, and the other output of the two outputs of the second 2×2 optical splitter 109 is coupled to the input of another second 1×2 optical splitter 110. That is, there are two second 1×2 optical splitters 110. Each of the four outputs of the two second 1×2 optical splitters 110 is coupled to one of the other four output waveguides 105 among the eight output waveguides 105 through an MZM modulator 108. The second 2×2 optical splitter 109 and the second 1×2 optical splitter 110 both split light in equal proportion. Finally, it is realized that: the light output from the third input waveguide 103 is equally divided into four paths and then coupled to four of the other output waveguides 105 among the eight output waveguides 105 respectively, and the light output from the fourth input waveguide 104 is equally divided into four paths and then coupled to four of the other output waveguides 105 among the eight output waveguides 105 respectively.

[0061] Embodiment 5

[0062] An 800G optical engine includes: a DR8 silicon photonics chip 1 as described in any one of Embodiments 1 to 4;

[0063] Select the second input waveguide 102 and the third input waveguide 103 as the two input waveguides of the DR8 silicon photonics chip 1. Then, the second input waveguide 102 and the third input waveguide 103 are respectively coupled to the dual optical isolator 2. Since the distance between the second input waveguide 102 and the third input waveguide 103 is 1 mm, the DR8 silicon photonics chip 1 can be compatible with the dual optical isolator 2 with a 1 mm pitch at this time, as Figure 5 shown;

[0064] Alternatively, select the first input waveguide 101 and the third input waveguide 103 as the two input waveguides of the DR8 silicon photonics chip 1. Then, the first input waveguide 101 and the third input waveguide 103 are respectively coupled to the dual optical isolator 2. Since the distance between the first input waveguide 101 and the third input waveguide 103 is 1.25 mm, the DR8 silicon photonics chip 1 can be compatible with the dual optical isolator 2 with a 1.25 mm pitch at this time, as Figure 6 shown;

[0065] Alternatively, select the second input waveguide 102 and the fourth input waveguide 104 as the two input waveguides of the DR8 silicon photonics chip 1. Then, the second input waveguide 102 and the fourth input waveguide 104 are respectively coupled to the dual optical isolator 2. Since the distance between the second input waveguide 102 and the fourth input waveguide 104 is 1.25 mm, the DR8 silicon photonics chip 1 can be compatible with the dual optical isolator 2 with a 1.25 mm pitch at this time, as Figure 7 shown;

[0066] Alternatively, select the first input waveguide 101 and the fourth input waveguide 104 as the two input waveguides of the DR8 silicon photonics chip 1. Then, the first input waveguide 101 and the fourth input waveguide 104 are respectively coupled to the dual optical isolator 2. Since the distance between the first input waveguide 101 and the fourth input waveguide 104 is 1.5 mm, the DR8 silicon photonics chip 1 can be compatible with the dual optical isolator 2 with a 1.5 mm pitch at this time, as Figure 8 shown;

[0067] So that the same DR8 silicon photonics chip 1 can be compatible with dual optical isolators 2 of three sizes, enabling the dual optical isolator 2 to be stocked flexibly and preventing production stoppage due to the lack of a certain size of dual optical isolator 2.

[0068] Embodiment 6

[0069] As Figures 5 to 8 shown, this embodiment is a further improvement based on Embodiment 5, specifically as follows:

[0070] Two laser chips 3 are coupled to the light input side of the dual optical isolator 2, and a collimating lens 4 is coupled between each laser chip 3 and the dual optical isolator 2. Each laser chip 3 is fixed on a ceramic heat sink;

[0071] A focusing lens 5 is coupled between the second input waveguide 102 and the dual optical isolator 2, and a focusing lens 5 is coupled between the third input waveguide 103 and the dual optical isolator 2. At this time, the emitted light of one of the two laser chips 3 is coupled into the second input waveguide 102 after passing through the collimating lens 4, the dual optical isolator 2, and the focusing lens 5 in sequence, and the emitted light of the other laser chip 3 is coupled into the third input waveguide 103 after passing through the collimating lens 4, the dual optical isolator 2, and the focusing lens 5 in sequence;

[0072] Alternatively, a focusing lens 5 is coupled between the first input waveguide 101 and the dual optical isolator 2, and a focusing lens 5 is coupled between the third input waveguide 103 and the dual optical isolator 2. In this case, the emitted light of one of the two laser chips 3 passes through the collimating lens 4, the dual optical isolator 2, and the focusing lens 5 in sequence and then is coupled into the first input waveguide 101, and the emitted light of the other laser chip 3 passes through the collimating lens 4, the dual optical isolator 2, and the focusing lens 5 in sequence and then is coupled into the third input waveguide 103;

[0073] Alternatively, a focusing lens 5 is coupled between the second input waveguide 102 and the dual optical isolator 2, and a focusing lens 5 is coupled between the fourth input waveguide 104 and the dual optical isolator 2. In this case, the emitted light of one of the two laser chips 3 passes through the collimating lens 4, the dual optical isolator 2, and the focusing lens 5 in sequence and then is coupled into the second input waveguide 102, and the emitted light of the other laser chip 3 passes through the collimating lens 4, the dual optical isolator 2, and the focusing lens 5 in sequence and then is coupled into the fourth input waveguide 104;

[0074] Alternatively, a focusing lens 5 is coupled between the first input waveguide 101 and the dual optical isolator 2, and a focusing lens 5 is coupled between the fourth input waveguide 104 and the dual optical isolator 2. In this case, the emitted light of one of the two laser chips 3 passes through the collimating lens 4, the dual optical isolator 2, and the focusing lens 5 in sequence and then is coupled into the first input waveguide 101, and the emitted light of the other laser chip 3 passes through the collimating lens 4, the dual optical isolator 2, and the focusing lens 5 in sequence and then is coupled into the fourth input waveguide 104.

[0075] The eight output waveguides 105 of the DR8 silicon photonics chip 1 are coupled to a multi-channel fiber array 6, that is, the eight output waveguides 105 of the DR8 silicon photonics chip 1 are respectively coupled to eight optical fibers in the multi-channel fiber array 6.

[0076] 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 DR8 silicon photonic chip compatible with a variety of dual optical isolators, characterized in that: The invention discloses a first input waveguide (101), a second input waveguide (102), a third input waveguide (103) and a fourth input waveguide (104) which are sequentially distributed on the same side; the light outputs of the first input waveguide (101) and the second input waveguide (102) are respectively divided into four paths in a geometrical ratio and then respectively coupled with four output waveguides (105) among eight output waveguides (105); the light outputs of the third input waveguide (103) and the fourth input waveguide (104) are respectively divided into four paths in a geometrical ratio and then respectively coupled with the other four output waveguides (105); the spacing between the first input waveguide (101) and the second input waveguide (102) is 0.25 mm; the spacing between the second input waveguide (102) and the third input waveguide (103) is 1 mm; and the spacing between the third input waveguide (103) and the fourth input waveguide (104) is 0.25 mm.

2. The DR8 silicon photonic chip according to claim 1, characterized in that: The first input waveguide (101), the second input waveguide (102), the third input waveguide (103) and the fourth input waveguide (104) are distributed at 0 degrees.

3. A DR8 silicon photonic chip according to claim 1 or 2, characterized in that: The output waveguides (105) are distributed obliquely, and the eight output waveguides (105) are parallel to each other.

4. The DR8 silicon photonic chip according to claim 3, characterized in that: The output waveguide (105) has an inclination angle of 8°±0.1°.

5. The DR8 silicon photonic chip according to claim 1, characterized in that: The first input waveguide (101), the second input waveguide (102), the third input waveguide (103), the fourth input waveguide (104) and the output waveguide (105) are located on the same side.

6. A DR8 silicon photonic chip according to any one of claims 1 to 5, characterized in that: The first input waveguide (101) and the second input waveguide (102) are respectively coupled to the two inputs of a first 2×2 optical splitter (106); the two outputs of the first 2×2 optical splitter (106) are respectively coupled to the inputs of two first 1×2 optical splitters (107); and the four outputs of the two first 1×2 optical splitters (107) are respectively coupled to four output waveguides (105) among the eight output waveguides (105) via an MZM modulator (108).

7. A DR8 silicon photonic chip according to any one of claims 1 to 5, characterized in that: The third input waveguide (103) and the fourth input waveguide (104) are respectively coupled to the two inputs of a second 2×2 optical splitter (109); the two outputs of the second 2×2 optical splitter (109) are respectively coupled to the inputs of two second 1×2 optical splitters (110); and the four outputs of the two second 1×2 optical splitters (110) are respectively coupled to the other four output waveguides (105) of the eight output waveguides (105) via an MZM modulator (108).

8. An 800G optical engine, characterized in that: include: According to the DR8 silicon photonic chip (1) as described in any one of claims 1 to 7, the first input waveguide (101) and the fourth input waveguide (104) are respectively coupled to the double optical isolator (2), or the first input waveguide (101) and the third input waveguide (103) are respectively coupled to the double optical isolator (2), or the second input waveguide (102) and the third input waveguide (103) are respectively coupled to the double optical isolator (2), or the second input waveguide (102) and the fourth input waveguide (104) are respectively coupled to the double optical isolator (2).

9. The 800G optical engine according to claim 7, characterized in that: The light-incoming side of the dual optical isolator (2) is coupled with two laser chips (3), and a collimating lens (4) is coupled between each laser chip (3) and the dual optical isolator (2); A converging lens (5) is coupled between the second input waveguide (102) and the double optical isolator (2), and a converging lens (5) is coupled between the third input waveguide (103) and the double optical isolator (2); Or, a converging lens (5) is coupled between the first input waveguide (101) and the double optical isolator (2), and a converging lens (5) is coupled between the third input waveguide (103) and the double optical isolator (2); Or, a converging lens (5) is coupled between the second input waveguide (102) and the double optical isolator (2), and a converging lens (5) is coupled between the fourth input waveguide (104) and the double optical isolator (2); Alternatively, a converging lens (5) is coupled between the first input waveguide (101) and the dual optical isolator (2), and a converging lens (5) is coupled between the fourth input waveguide (104) and the dual optical isolator (2).

10. The 800G optical engine according to claim 7, characterized in that: The eight output waveguides (105) of the DR8 silicon photonic chip (1) are coupled to a multi-channel optical fiber array (6).

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