A low-cost 800G DR8 optical engine

Abstract

The present invention relates to a low-cost 800G DR8 optical engine, comprising: a silicon photonic chip, a polarization-independent optical isolator and two optical emitting ends, the silicon photonic chip having two input waveguides and eight output waveguides, the two input waveguides being distributed in an eight-shaped mirror image in the horizontal direction, and the beam end facing outward, the two optical emitting ends being distributed in an eight-shaped shape in the horizontal direction, the light beams emitted by the two light emitting ends having a cross point, the polarization-independent optical isolator being arranged at the cross point of the light beams emitted by the two light emitting ends, the polarization-independent optical isolator being coupled to the edge of the silicon photonic chip, and the optical signals emitted by the two light emitting ends being coupled into the two input waveguides of the silicon photonic chip respectively after passing through the same polarization-independent optical isolator. The beneficial effects are: a polarization-independent optical isolator can be saved, thereby effectively reducing the cost, and the tilt distribution of the two input waveguides can further reduce light reflection relative to the existing 0°, thereby improving the optical performance.

Description

Technical Field

[0001] The present invention relates to the technical field of optical engines, and in particular to a low-cost 800G DR8 optical engine. Background Art

[0002] The existing 800G DR8 optical engine structure is as follows Figure 1 As shown, it includes: a silicon photonic chip, two light emitting ends, two polarization-independent optical isolators, two collimating lenses, two converging lenses and an eight-channel optical fiber array. The silicon photonic chip has two horizontally distributed input waveguides and eight output waveguides tilted at 8° on the same side. The output waveguide is tilted at 8° to reduce light reflection. The light beams emitted by the two light emitting ends are parallel to each other.

[0003] The light emitting end includes: a ceramic heat sink and a laser chip fixed on the ceramic heat sink, wherein a light beam emitted by one of the light emitting ends is coupled into one of the input waveguides through a collimating lens, a polarization-independent optical isolator and a converging lens in sequence, and a light beam emitted by another light emitting end is coupled into another input waveguide through another collimating lens, another polarization-independent optical isolator and another converging lens in sequence;

[0004] The end face of the eight-channel fiber array is tilted 8°. The eight-channel fiber array is coupled to the eight output waveguides of the silicon photonic chip. The input light of each input waveguide is evenly divided into four paths. The input light of one of the two input waveguides is divided into four paths and then coupled into four of the eight output waveguides, while the input light of the other input waveguide is divided into four paths and then coupled into the remaining four of the eight output waveguides. The output lights of the eight output waveguides are respectively coupled into the eight optical fibers in the eight-channel fiber array. The number of polarization-independent optical isolators in this scheme is two. Since the polarization-independent optical isolator can prevent the influence of reflected light on the laser chip, it cannot be omitted, and thus the cost of this scheme is relatively high. Summary of the invention

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

[0006] The technical solution of the present invention to solve the above technical problems is as follows: a low-cost 800G DR8 optical engine, comprising: a silicon photonic chip, a polarization-independent optical isolator and two optical emitting ends, the silicon photonic chip having two input waveguides and eight output waveguides, the two input waveguides being distributed in an eight-shaped mirror image in the horizontal direction, and the beam ends facing outward, the two optical emitting ends being distributed in an eight-shaped shape in the horizontal direction, the light beams emitted by the two light emitting ends having an intersection, the polarization-independent optical isolator being arranged at the intersection of the light beams emitted by the two light emitting ends, the polarization-independent optical isolator being edge-coupled with the silicon photonic chip, and the optical signals emitted by the two light emitting ends being respectively coupled into the two input waveguides of the silicon photonic chip after passing through the same polarization-independent optical isolator.

[0007] The beneficial effects of the present invention are as follows: in the present invention, since the two light emitting ends can share a polarization-independent optical isolator, compared with the prior art, a polarization-independent optical isolator can be saved, thereby effectively reducing costs. At the same time, the tilt distribution of the two input waveguides can further reduce light reflection compared to the existing 0°, thereby improving optical performance.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the tilt angle of the input waveguide in the horizontal direction is 6° to 13°.

[0010] The further beneficial effects of adopting the above method are: the larger the angle, the larger the size of the polarization-independent optical isolator and the higher the cost; the smaller the angle, the smaller the size of the polarization-independent optical isolator. However, in order to avoid interference between the two lenses, the total distance from the laser chip to the silicon photonic chip in the light emitting end will be longer. Therefore, this range of angles is selected based on the cost and the total space for packaging the optical engine.

[0011] Furthermore, the tilt angle of the input waveguide in the horizontal direction is 11°.

[0012] Furthermore, glue with a refractive index of 1.4 to 1.45 is filled between the polarization-independent optical isolator and the input waveguide of the silicon photonic chip; and a non-spherical lens is coupled between each light emitting end and the polarization-independent optical isolator.

[0013] The above further beneficial effect is as follows: since the present invention uses low-refractive-index glue to fill the input waveguides of the polarization-independent optical isolator and the silicon photonic chip, the input waveguide of the silicon photonic chip has a mode expansion effect, and thus high coupling efficiency can be achieved by coupling only one aspherical lens between each light emitting end and the polarization-independent optical isolator, which saves two converging lenses compared to the prior art. In addition, since the present invention only uses a single lens, the intersection point of the light is closer to the silicon photonic chip, so the eight-shaped beam ends formed by the two input waveguides can also be closer, so that the size of the polarization-independent optical isolator can be relatively reduced, and the cost is further reduced.

[0014] Furthermore, the eight output waveguides of the silicon photonic chip are distributed at an angle of 8°, and an eight-channel optical fiber array is coupled to the edge of the silicon photonic chip. The end face of the eight-channel optical fiber array is inclined at 8°, and the eight-channel optical fiber array is coupled to the eight output waveguides of the silicon photonic chip.

[0015] Furthermore, the light emitting end includes: a ceramic heat sink and a laser chip fixed on the ceramic heat sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of an 800G DR8 optical engine in the prior art;

[0017] Figure 2 This is a structural diagram of the low-cost 800G DR8 optical engine of the present invention.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0019] 1. Silicon photonic chip, 110. Input waveguide, 120. Output waveguide, 2. Polarization-independent optical isolator, 3. Optical transmitter, 310. Ceramic heat sink, 320. Laser chip, 4. Aspherical lens, 5. Eight-channel optical fiber array. DETAILED DESCRIPTION

[0020] 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.

[0021] Example 1

[0022] like Figure 2As shown, a low-cost 800G The DR8 optical engine comprises: a silicon photonic chip 1, a polarization-independent optical isolator 2 and two optical emitting ends 3; the silicon photonic chip 1 has two input waveguides 110 and eight output waveguides 120, the two input waveguides 110 are distributed in an eight-shaped mirror image in the horizontal direction, and the beam ends face outward; the two optical emitting ends 3 are also distributed in an eight-shaped shape in the horizontal direction, and the beam ends face the silicon photonic chip 1, the light beams emitted by the two light emitting ends 3 have an intersection, and the polarization-independent optical isolator 2 is arranged at the intersection of the light beams emitted by the two light emitting ends 3, the polarization-independent optical isolator 2 is coupled with the silicon photonic chip 1, and the optical signals emitted by the two light emitting ends 3 are respectively coupled into the two input waveguides 110 of the silicon photonic chip 1 after passing through the same polarization-independent optical isolator 2; in the present invention, since the two optical emitting ends 3 can share one polarization-independent optical isolator 2, compared with the prior art, one polarization-independent optical isolator 2 can be saved, thereby effectively reducing the cost, and at the same time, the inclined distribution of the two input waveguides 110 can further reduce light reflection compared with the existing 0°, thereby improving the optical performance.

[0023] Example 2

[0024] like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1, and the details are as follows:

[0025] The inclination angle of the input waveguide 110 in the horizontal direction is 6° to 13°, which can be understood as one of the two input waveguides 110 is tilted upward by 6° to 13° in the horizontal direction, and the other input waveguide 110 is tilted downward by 6° to 13° in the horizontal direction. The larger the angle, the larger the size of the polarization-independent optical isolator 2 and the higher the cost. The smaller the angle, the smaller the size of the polarization-independent optical isolator 2. However, in order to avoid interference between the two lenses, the total distance from the laser chip 320 in the optical emitting end 3 to the silicon photonic chip 1 will be longer. Therefore, this range of angles is selected based on the cost and the total space of the packaged optical engine.

[0026] In the present invention, the inclination angle of the input waveguide 110 in the horizontal direction is preferably 11°, which can be understood as one of the two input waveguides 110 is inclined 11° in the positive direction in the horizontal direction, and the other input waveguide 110 is inclined 11° in the negative direction in the horizontal direction.

[0027] Example 3

[0028] 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:

[0029] Glue with a refractive index of 1.4 to 1.45 is filled between the polarization-independent optical isolator 2 and the input waveguide 110 of the silicon photonic chip 1, and a non-spherical lens 4 is coupled between each light emitting end 3 and the polarization-independent optical isolator 2. Since low-refractive-index glue is used to fill the polarization-independent optical isolator 2 and the input waveguide 110 of the silicon photonic chip 1, the input waveguide 110 of the silicon photonic chip 1 has a mode expansion effect, and thus high coupling efficiency can be achieved by coupling only one non-spherical lens 4 between each light emitting end 3 and the polarization-independent optical isolator 2, which saves two converging lenses compared to the prior art.

[0030] Example 4

[0031] like Figure 2 As shown, this embodiment is a further improvement on any one of Embodiments 1 to 3, and the details are as follows:

[0032] The eight output waveguides 120 of the silicon photonic chip 1 are distributed at an angle of 8°, which can reduce light reflection. An eight-channel optical fiber array 5 is coupled to one side of the silicon photonic chip 1, and the end face of the eight-channel optical fiber array 5 is inclined at 8°. The eight-channel optical fiber array 5 is coupled to the eight output waveguides 120 of the silicon photonic chip 1, and the input light of each input waveguide 110 is evenly divided into four paths. The input light of one of the two input waveguides 110 is divided into four paths and then coupled into four of the eight output waveguides 120, while the input light of the other input waveguide 110 is divided into four paths and then coupled into the remaining four output waveguides 120 of the eight output waveguides 120. The output lights of the eight output waveguides 120 are respectively coupled into the eight optical fibers in the eight-channel optical fiber array 5.

[0033] In addition, the light emitting end 3 includes a ceramic heat sink 310 and a laser chip 320 fixed on the ceramic heat sink 310 .

[0034] 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 low-cost 800G DR8 optical engine, characterized in that: include: A silicon photonic chip (1), a polarization-independent optical isolator (2) and two light emitting ends (3), wherein the silicon photonic chip (1) has two input waveguides (110) and eight output waveguides (120), the two input waveguides (110) are distributed in an eight-shaped mirror image in the horizontal direction, and the beam ends face outward, the input waveguides (110) are tilted at an angle of 6° to 13° in the horizontal direction, the two light emitting ends (3) are distributed in an eight-shaped shape in the horizontal direction, the light beams emitted by the two light emitting ends (3) have a cross point, and the polarization-independent optical isolator (2) is arranged between the two light emitting ends. At the intersection of the light beams emitted by the emission end (3), the polarization-independent optical isolator (2) is coupled to the silicon photonic chip (1), and the optical signals emitted by the two light emission ends (3) are respectively coupled into the two input waveguides (110) of the silicon photonic chip (1) after passing through the same polarization-independent optical isolator (2); glue with a refractive index of 1.4 to 1.45 is filled between the polarization-independent optical isolator (2) and the input waveguide (110) of the silicon photonic chip (1); and a non-spherical lens (4) is coupled between each light emission end (3) and the polarization-independent optical isolator (2).

2. A low-cost 800G DR8 optical engine according to claim 1, characterized in that: The input waveguide (110) has an inclination angle of 11° in the horizontal direction.

3. The low-cost 800G DR8 optical engine according to claim 1, characterized in that: The eight output waveguides (120) of the silicon photonic chip (1) are distributed at an angle of 8°, the silicon photonic chip (1) is coupled to an eight-channel optical fiber array (5), the end face of the eight-channel optical fiber array (5) is inclined at 8°, and the eight-channel optical fiber array (5) is coupled to the eight output waveguides (120) of the silicon photonic chip (1).

4. The low-cost 800G DR8 optical engine according to claim 1, characterized in that: The light emitting end (3) comprises: a ceramic heat sink (310) and a laser chip (320) fixed on the ceramic heat sink (310).

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