DR4 silicon optical chip and 400G silicon optical engine

Abstract

The invention relates to a DR4 silicon optical chip, which is characterized in that one side surface of a chip main body is an optical surface inclined by 8 + / -0.1 degrees, four output waveguides which are perpendicular to and intersect with the optical surface are arranged on the chip main body side by side, and an input waveguide which intersects with the optical surface is arranged on the chip main body. According to the 400G silicon optical engine, the end face of a multi-channel optical fiber array is a 0-degree face, the 0-degree face of the multi-channel optical fiber array is attached to the optical face of a DR4 silicon optical chip, and the multi-channel optical fiber array is coupled with four output waveguides on the DR4 silicon optical chip. The beneficial effects are that the DR4 silicon optical chip is provided with an optical surface with an inclination of 8 + / -0.1 degree, and the output waveguide is perpendicular to and intersects with the optical surface, so when the DR4 silicon optical chip is applied to a 400G silicon optical engine, the end surface of the selected multichannel optical fiber array can be a 0-degree surface, the grinding efficiency of the multichannel optical fiber array is effectively improved, the angle error is reduced, and the grinding precision is improved. The coupling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of optical engine technology, and in particular to a DR4 silicon photonic chip and a 400G silicon photonic engine. Background Art

[0002] The traditional 400G silicon photonic engine structure is as follows Figure 1 As shown, it includes: a DR4 silicon photonic chip, a multi-channel optical fiber array, a laser chip, a collimating lens, an optical isolator and a converging lens. The DR4 silicon photonic chip has an input waveguide and four output waveguides. The input waveguide and the output waveguide are distributed at an inclination of 8°±0.1°. The input waveguide is coupled with the input of a first 1×2 coupler. The two outputs of the first 1×2 coupler are each coupled with the input of a second 1×2 coupler. Each output of each second 1×2 coupler is coupled with an output waveguide via an MZM modulator. The first 1×2 coupler and the second 1×2 coupler both split light in equal proportions, so that the light output from the input waveguide can be divided into four output waveguides in equal proportions. The laser chip, the collimating lens, the optical isolator and the converging lens are coupled in sequence. The converging lens and The input waveguide coupling of the DR4 silicon photonic chip is tilted at 8°±0.1°, so the laser chip is also tilted at 8°±0.1° during patching, resulting in low patching efficiency and poor precision. The collimating lens, optical isolator and converging lens are also tilted at 8°±0.1°, which makes coupling inconvenient. Since the output waveguide is tilted at 8°±0.1° and the optical surface of the DR4 silicon photonic chip is a 0-degree surface, the end face of the multi-channel fiber array must be polished to 8°±0.1°. Then the end face of the multi-channel fiber array at 8°±0.1° is attached to the 0-degree optical surface of the DR4 silicon photonic chip. The multi-channel fiber array is coupled with the four output waveguides of the DR4 silicon photonic chip. The end face of the multi-channel fiber array is polished at 8°±0.1°, which results in long polishing time, more glass material is polished, larger angle error and reduced coupling efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a DR4 silicon photonic chip and a 400G silicon photonic engine 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 DR4 silicon photonic chip comprises: a chip body, one side of the chip body being an optical surface inclined at 8°±0.1°, four output waveguides arranged side by side on the chip body, perpendicular to and intersecting the optical surface, and an input waveguide intersecting the optical surface, the input waveguide being coupled to the four output waveguides respectively.

[0005] The beneficial effect of the present invention is: since the DR4 silicon photonic chip has an optical surface inclined at 8°±0.1°, and the output waveguide is perpendicular to and intersects with the optical surface, when the DR4 silicon photonic chip is used in a 400G silicon photonic engine, the end face of the selected multi-channel optical fiber array can be a 0-degree face, which effectively improves the polishing efficiency of the multi-channel optical fiber array, reduces the angle error, and improves the coupling efficiency.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the input waveguide is tilted relative to the horizontal line and satisfies: Sin×n1=sin×n2, where a is the inclination angle of the input waveguide end face, n1 is the refractive index of air, which is 1, b is the angle between the input waveguide and the vertical line of the optical surface, and n2 is the refractive index of the input waveguide.

[0008] The further beneficial effect of adopting the above is: when this condition is met, if horizontal light is incident on the end face of the input waveguide, the angle of the refracted optical path will be the same as the angle of the input waveguide, that is, the refracted optical path will be collinear with the input waveguide. When the DR4 silicon photonic chip is used in a 400G silicon photonic engine, the laser chip, collimating lens, optical isolator and converging lens can all be horizontally distributed at 0 degrees. Since the laser chip is horizontally distributed at 0 degrees, it is convenient to patch it, thereby improving the patch efficiency and accuracy. The collimating lens, optical isolator and converging lens are horizontally distributed at 0 degrees, which facilitates coupling and ensures the highest coupling efficiency.

[0009] Furthermore, the input waveguide end face has an inclination angle of 8°, the input waveguide is made of silicon dioxide with a refractive index of 1.45, and the angle between the input waveguide and the vertical line of the optical surface is 5.508°.

[0010] Furthermore, at least two mark points are provided on both sides of the input waveguide on the chip body with the horizontal light as the symmetry line.

[0011] A further beneficial effect of the above is that when the DR4 silicon photonic chip is used in a 400G silicon photonic engine, the symmetry line of the mark point can be used as the patch position of the laser chip, which facilitates patching.

[0012] Furthermore, two mark points are provided on the chip body on both sides of the input waveguide with the horizontal light as the symmetry line.

[0013] Furthermore, the input waveguide is coupled to the input of a first 1×2 coupler, the two outputs of the first 1×2 coupler are each coupled to the input of a second 1×2 coupler, and each output of each second 1×2 coupler is coupled to an output waveguide via an MZM modulator.

[0014] Based on the above technical solution, the present invention also provides a 400G silicon photonic engine, including: a multi-channel fiber array and a DR4 silicon photonic chip. The end face of the multi-channel fiber array is a 0-degree face, and the 0-degree face of the multi-channel fiber array is attached to the optical surface of the DR4 silicon photonic chip, and the multi-channel fiber array is coupled with the four output waveguides on the DR4 silicon photonic chip.

[0015] A further beneficial effect of the above-mentioned method is that since the DR4 silicon photonic chip has an optical surface inclined at 8°±0.1°, and the output waveguide is perpendicular to and intersects with the optical surface, the end face of the selected multi-channel optical fiber array can be a 0-degree face, which effectively improves the polishing efficiency of the multi-channel optical fiber array, reduces the angle error, and improves the coupling efficiency.

[0016] Furthermore, the input waveguide on the DR4 silicon photonic chip is coupled to the optical emission end.

[0017] Furthermore, the light emitting end includes: a laser chip, a collimating lens, an optical isolator and a converging lens horizontally distributed at 0 degrees along the light propagation direction, and the converging lens is coupled with the input waveguide on the DR4 silicon photonic chip.

[0018] The above further beneficial effects are: the laser chip, collimating lens, optical isolator and converging lens can all be horizontally distributed at 0 degrees. Since the laser chip is horizontally distributed at 0 degrees, it is convenient to mount it, thereby improving the efficiency and accuracy of the mounting. The collimating lens, optical isolator and converging lens are horizontally distributed at 0 degrees, which facilitates coupling and ensures the highest coupling efficiency.

[0019] Furthermore, the laser chip is fixed on a ceramic heat sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a 400G silicon photonic engine in the prior art; Figure 2 This is a structural diagram of the DR4 silicon photonic chip in the present invention; Figure 3 This is a structural diagram of the 400G silicon photonic engine in the present invention.

[0021] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. DR4 silicon photonic chip, 110. Chip body, 111. Optical surface, 120. Output waveguide, 130. Input waveguide, 140. Mark point, 150. First 1×2 coupler, 160. Second 1×2 coupler, 170. MZM modulator, 2. Multi-channel fiber array, 3. Laser chip, 4. Collimating lens, 5. Optical isolator, 6. Converging lens, 7. Ceramic heat sink. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below with reference to 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 2 As shown, a DR4 silicon photonic chip includes: a chip body 110, one side of the chip body 110 is an optical surface 111 inclined at 8°±0.1°, which can be understood as: one side of the chip body 110 is cut at an angle of 8°±0.1°, so that the side thereof forms an optical surface 111 inclined at 8°±0.1°, and four output waveguides 120 are arranged side by side on the chip body 110, and the four output waveguides 120 are respectively perpendicular to and intersect with the optical surface 111. At this time, it can be understood as: each output waveguide 120 is inclined at 8°±0.1° compared to the horizontal line, and the core An input waveguide 130 is provided on the chip body 110, which intersects with the optical surface 111, and the input waveguide 130 is coupled with four output waveguides 120 respectively. Since the DR4 silicon photonic chip 1 has an optical surface 111 inclined at 8°±0.1°, and the output waveguide 120 is perpendicular to and intersects with the optical surface 111, when the DR4 silicon photonic chip 1 is used in a 400G silicon photonic engine, the end face of the selected multi-channel optical fiber array 2 can be a 0-degree face, which effectively improves the grinding efficiency of the multi-channel optical fiber array 2, reduces the angle error, and improves the coupling efficiency.

[0024] Example 2 like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1, specifically as follows: The input waveguide 130 is tilted relative to the horizontal line and satisfies the following condition: Sin(a)×n1=sin(b)×n2, where a is the inclination angle of the end face of the input waveguide 130. Since the input waveguide 130 intersects with the optical surface 111, the inclination angle of the end face of the input waveguide 130 is actually the same as the inclination angle of the optical surface 111. n1 is the refractive index of air, which is 1. b is the angle between the input waveguide 130 and the perpendicular line of the optical surface 111. n2 is the refractive index of the input waveguide 130. When this condition is met, if horizontal light (0-degree light) is incident on the end face of the input waveguide 130, the angle of the refracted optical path will be the same as that of the input waveguide 130, that is, the refracted optical path will be collinear with the input waveguide 130.

[0025] When the DR4 silicon photonic chip 1 is used in a 400G silicon photonic engine, the laser chip 3, the collimating lens 4, the optical isolator 5 and the converging lens 6 can all be horizontally distributed at 0 degrees. Since the laser chip 3 is horizontally distributed at 0 degrees, it is convenient to mount it, thereby improving the efficiency and accuracy of the mounting. The collimating lens 4, the optical isolator 5 and the converging lens 6 are horizontally distributed at 0 degrees, which facilitates coupling and ensures the highest coupling efficiency.

[0026] Furthermore, in this embodiment, the inclination angle of the end face of the input waveguide 130 is 8°, the inclination angle of the optical surface 111 is 8°, the material of the input waveguide 130 is silicon dioxide with a refractive index of 1.45, and the angle between the input waveguide 130 and the perpendicular line of the optical surface 111 is 5.508°. The inclination angle of the input waveguide 130 relative to the horizontal line will be 8°-5.508°=2.492°. Of course, this is just an exemplary statement. When the inclination angle of the end face of the input waveguide 130 remains unchanged and the refractive index of the input waveguide 130 changes, the angle between the input waveguide 130 and the perpendicular line of the optical surface 111 will also change.

[0027] Example 3 like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1 or 2, specifically as follows: At least two mark points 140 are provided on the chip body 110 on both sides of the input waveguide 130 with the horizontal light as the symmetry line. At least two can refer to two, three, four, etc. When the DR4 silicon photonic chip 1 is used in a 400G silicon photonic engine, the symmetry line of the mark point 140 can be used as the patch position of the laser chip 3 to facilitate patching. As shown in the accompanying drawings: two mark points 140 are provided on the chip body 110 on both sides of the input waveguide 130 with the horizontal light as the symmetry line. Of course, this is just an illustrative example, and other numbers are not excluded in actual application.

[0028] Example 4 like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1, 2 or 3, and the details are as follows: The input waveguide 130 is coupled to the input of a first 1×2 coupler 150, and the two outputs of the first 1×2 coupler 150 are each coupled to the input of a second 1×2 coupler 160, so there are two second 1×2 couplers 160. Each output of each second 1×2 coupler 160 is coupled to an output waveguide 120 via an MZM modulator 170, so there are four MZM modulators 170. The first 1×2 coupler 150 and the second 1×2 coupler 160 both split light in equal proportions, so that the light output from the input waveguide 130 can be split into four output waveguides 120 in equal proportions.

[0029] Example 5 like Figure 2 、 Figure 3As shown, a 400G silicon photonic engine includes: a multi-channel optical fiber array 2 and a DR4 silicon photonic chip 1 as in any one of embodiments 1 to 4, the end face of the multi-channel optical fiber array 2 is a 0-degree face, the 0-degree face of the multi-channel optical fiber array 2 is attached to the optical surface 111 of the DR4 silicon photonic chip 1, and the multi-channel optical fiber array 2 is coupled to the four output waveguides 120 on the DR4 silicon photonic chip 1; since the DR4 silicon photonic chip 1 has an optical surface 111 inclined at 8°±0.1°, and the output waveguide 120 is perpendicular to and intersects with the optical surface 111, the end face of the selected multi-channel optical fiber array 2 can be a 0-degree face, which effectively improves the polishing efficiency of the multi-channel optical fiber array 2, reduces the angle error, and improves the coupling efficiency.

[0030] Example 6 like Figure 2 、 Figure 3 As shown, this embodiment is a further improvement on the basis of embodiment 5, specifically as follows: The input waveguide 130 on the DR4 silicon photonic chip 1 is coupled to the light emitting end, that is, the light emitted by the light emitting end can be coupled into the input waveguide 130 on the DR4 silicon photonic chip 1 .

[0031] The light emitting end includes: a laser chip 3, a collimating lens 4, an optical isolator 5 and a converging lens 6 distributed in sequence along the direction of light propagation. The converging lens 6 is coupled to the input waveguide 130 on the DR4 silicon photonic chip 1, and the laser chip 3 is fixed on the ceramic heat sink 7; when the DR4 silicon photonic chip 1 is the DR4 silicon photonic chip 1 described in Example 2, the laser chip 3, the collimating lens 4, the optical isolator 5 and the converging lens 6 are all horizontally distributed at 0 degrees. Since the laser chip 3 is horizontally distributed at 0 degrees, it is convenient to mount it, and the collimating lens 4, the optical isolator 5 and the converging lens 6 are horizontally distributed at 0 degrees, which is convenient for coupling.

[0032] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A DR4 silicon photonic chip, characterized in that: include: A chip body (110), one side of the chip body (110) being an optical surface (111) inclined at 8°±0.1°, four output waveguides (120) perpendicular to and intersecting the optical surface (111) being arranged side by side on the chip body (110), an input waveguide (130) intersecting the optical surface (111) being provided on the chip body (110), and the input waveguide (130) being coupled to the four output waveguides (120) respectively.

2. The DR4 silicon photonic chip according to claim 1, characterized in that: The input waveguide (130) is tilted relative to the horizontal line and satisfies the following relationship: Sin (a) × n1 = sin (b) × n2, wherein a is the inclination angle of the end face of the input waveguide (130), n1 is the refractive index of air, which is 1, b is the angle between the input waveguide (130) and the vertical line of the optical surface (111), and n2 is the refractive index of the input waveguide (130).

3. The DR4 silicon photonic chip according to claim 2, characterized in that: The input waveguide (130) has an end face tilt angle of 8°, the input waveguide (130) is made of silicon dioxide with a refractive index of 1.45, and the input waveguide (130) has an angle of 5.508° relative to a vertical line of the optical surface (111).

4. A DR4 silicon photonic chip according to claim 2 or 3, characterized in that: At least two mark points (140) are respectively provided on the chip body (110) on both sides of the input waveguide (130) with the horizontal light as the symmetry line.

5. The DR4 silicon photonic chip according to claim 4, characterized in that: Two mark points (140) are respectively provided on the chip body (110) on both sides of the input waveguide (130) with the horizontal light as the symmetry line.

6. The DR4 silicon photonic chip according to claim 1, characterized in that: The input waveguide (130) is coupled to the input of a first 1×2 coupler (150), the two outputs of the first 1×2 coupler (150) are each coupled to the input of a second 1×2 coupler (160), and each output of each second 1×2 coupler (160) is coupled to an output waveguide (120) via an MZM modulator (170).

7. A 400G silicon photonic engine, characterized in that: include: A multi-channel optical fiber array (2) and a DR4 silicon photonic chip (1) as claimed in any one of claims 1 to 6, wherein the end face of the multi-channel optical fiber array (2) is a 0-degree face, the 0-degree face of the multi-channel optical fiber array (2) is in contact with the optical surface (111) of the DR4 silicon photonic chip (1), and the multi-channel optical fiber array (2) is coupled to four output waveguides (120) on the DR4 silicon photonic chip (1).

8. The 400G silicon photonic engine according to claim 7, characterized in that: The input waveguide (130) on the DR4 silicon photonic chip is coupled to the light emitting end.

9. The 400G silicon photonic engine according to claim 8, characterized in that: The light emitting end comprises: a laser chip (3) horizontally distributed at 0 degrees along the light propagation direction, a collimating lens (4), an optical isolator (5), and a converging lens (6); the converging lens (6) is coupled to an input waveguide (130) on a DR4 silicon photonic chip.

10. The 400G silicon photonic engine according to claim 9, characterized in that: The laser chip (3) is fixed on a ceramic heat sink (7).

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