DR4 silicon optical chip and 400g silicon optical engine

Abstract

The application relates to a DR4 silicon optical chip, one side of a chip body is an optical surface with an inclination of 8 DEG + / -0.1 DEG, four output waveguides vertical to and intersecting with the optical surface are arranged side by side on the chip body, and an input waveguide intersecting with the optical surface is arranged on the chip body. A 400G silicon optical engine, an end surface of a multi-channel fiber array is a 0-degree surface, the 0-degree surface of the multi-channel fiber array is attached to the optical surface of the DR4 silicon optical chip, and the multi-channel fiber array is coupled with the four output waveguides on the DR4 silicon optical chip. The beneficial effect is that, since the DR4 silicon optical chip has an optical surface with an inclination of 8 DEG + / -0.1 DEG and the output waveguides are vertical to and intersect with the optical surface, when the DR4 silicon optical chip is applied to the 400G silicon optical engine, the end surface of the selected multi-channel fiber array can be a 0-degree surface, the grinding efficiency of the multi-channel fiber array is effectively improved, the angle error is reduced, and the coupling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light engine, in particular to a DR4 silicon light chip and a 400G silicon light engine. BACKGROUND

[0002] The traditional 400G silicon light engine structure is shown in Figure 1 It includes a DR4 silicon light chip, a multi-channel fiber array, a laser chip, a collimating lens, an optical isolator and a converging lens. The DR4 silicon light chip has one input waveguide and four output waveguides. The input waveguide and the output waveguides are distributed at an inclination of 8°±0.1°. The input waveguide is coupled with the input of a first 1x2 coupler. The two outputs of the first 1x2 coupler are each coupled with the input of a second 1x2 coupler. Each output of each second 1x2 coupler is coupled with an output waveguide through an MZM modulator. The first 1x2 coupler and the second 1x2 coupler are each split light in equal proportion, so that the light output from the input waveguide can be split to the four output waveguides in equal proportion. The laser chip, the collimating lens, the optical isolator and the converging lens are coupled in sequence. The converging lens is coupled with the input waveguide of the DR4 silicon light chip. Since the input waveguide is distributed at an inclination of 8°±0.1°, the laser chip is also inclined at 8°±0.1° when it is pasted, resulting in low pasting efficiency and poor precision. Since the collimating lens, the optical isolator and the converging lens are also inclined at 8°±0.1°, the coupling is inconvenient. Since the output waveguides are distributed at an inclination of 8°±0.1° and the optical surface of the DR4 silicon light chip is a 0-degree surface, the end surface of the multi-channel fiber array is ground to 8°±0.1°. Then the 8°±0.1° end surface of the multi-channel fiber array is pasted to the 0-degree optical surface of the DR4 silicon light chip. The multi-channel fiber array is coupled with the four output waveguides of the DR4 silicon light chip. However, the end surface of the multi-channel fiber array is ground to 8°±0.1°, resulting in long grinding time, more glass material for grinding, larger angle error and lower coupling efficiency. SUMMARY

[0003] The present application provides a DR4 silicon light chip and a 400G silicon light engine to overcome the deficiencies of the prior art.

[0004] The technical solution of the present application to solve the above technical problems is as follows:

[0005] A DR4 silicon light chip includes a chip body, one side of the chip body being an optical surface inclined at 8°±0.1°. Four output waveguides perpendicular to and intersecting the optical surface are arranged side by side on the chip body. An input waveguide intersecting the optical surface is arranged on the chip body. The input waveguide is coupled with the four output waveguides.

[0006] The beneficial effects of the present application are: since the DR4 silicon optical chip has an optical surface with an inclination of 8°±0.1°, and the output waveguide is perpendicular to and intersects with the optical surface, when the DR4 silicon optical chip is applied in a 400G silicon optical engine, the end face of the selected multi-channel fiber array can be a 0-degree face, effectively improving the grinding efficiency of the multi-channel fiber array, reducing the angle error, and improving the coupling efficiency.

[0007] Based on the above technical solutions, the present application can also be improved as follows.

[0008] Further, the input waveguides are inclined relative to the horizontal line and satisfy: Sin×n1=sin×n2, wherein a is the inclination of the end face of the input waveguide, n1 is the air refractive index, and the value is 1, b is the included angle of the input waveguide and the vertical line of the optical surface, and n2 is the refractive index of the input waveguide.

[0009] The above further beneficial effects are: when the condition is met, if the horizontal light is incident on the end face of the input waveguide, the angle of the refracted light path will be the same as the angle of the input waveguide, that is, the refracted light path will be collinear with the input waveguide, when the DR4 silicon optical chip is applied in a 400G silicon optical engine, the laser chip, the collimating lens, the optical isolator and the converging lens can be distributed horizontally at 0 degrees, since the laser chip is distributed horizontally at 0 degrees, it is convenient to paste the chip, and the pasting efficiency and accuracy are improved, and since the collimating lens, the optical isolator and the converging lens are distributed horizontally at 0 degrees, it is convenient to couple, and the coupling efficiency is guaranteed to be the highest.

[0010] Further, the inclination of the end face of the input waveguide is 8°, the material of the input waveguide is silicon dioxide with a refractive index of 1.45, and the included angle of the input waveguide relative to the vertical line of the optical surface is 5.508°.

[0011] Further, at least two mark points are arranged on the chip body on both sides of the input waveguide with horizontal light as the symmetry line.

[0012] The above further beneficial effects are: when the DR4 silicon optical chip is applied in a 400G silicon optical engine, the symmetry line of the mark points can be used as the pasting position of the laser chip, which is convenient for pasting.

[0013] Further, two mark points are arranged on the chip body on both sides of the input waveguide with horizontal light as the symmetry line.

[0014] Further, the input waveguide is coupled with an input of a first 1×2 coupler, two outputs of the first 1×2 coupler are each coupled with an input of a second 1×2 coupler, and each output of each second 1×2 coupler is coupled with an output waveguide through an MZM modulator.

[0015] Based on the above technical scheme, the application further provides a 400G silicon light engine, comprising: a multi-channel optical fiber array and a DR4 silicon light chip, an end face of the multi-channel optical fiber array is a 0-degree face, the 0-degree face of the multi-channel optical fiber array is attached to an optical face of the DR4 silicon light chip, and the multi-channel optical fiber array is coupled with four output waveguides on the DR4 silicon light chip.

[0016] The further beneficial effect is that: since the DR4 silicon light chip has an optical face with an inclination of 8°±0.1°, and the output waveguide is perpendicular to and intersects with the optical face, the end face of the multi-channel optical fiber array used can be a 0-degree face, effectively improving the grinding efficiency of the multi-channel optical fiber array, reducing the angle error, and improving the coupling efficiency.

[0017] Further, the input waveguide on the DR4 silicon light chip is coupled with a light emitting end.

[0018] Further, the light emitting end comprises: laser chip, collimating lens, optical isolator and converging lens which are horizontally distributed in turn at 0 degrees along the light propagation direction, and the converging lens is coupled with the input waveguide on the DR4 silicon light chip.

[0019] The further beneficial effect is that: 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 paste the laser chip, improving the pasting efficiency and accuracy, and since the collimating lens, optical isolator and converging lens are horizontally distributed at 0 degrees, it is convenient to couple, ensuring the highest coupling efficiency.

[0020] Further, the laser chip is fixed on a ceramic heat sink. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural diagram of the 400G silicon light engine in the prior art;

[0022] Figure 2 It is a structural diagram of the DR4 silicon light chip in the application;

[0023] Figure 3 It is a structural diagram of the 400G silicon light engine in the application.

[0024] In the drawings, the components represented by each reference numeral are listed as follows:

[0025] 1, DR4 silicon light chip, 110, chip main body, 111, optical face, 120, output waveguide, 130, input waveguide, 140, mark point, 150, first 1x2 coupler, 160, second 1x2 coupler, 170, MZM modulator, 2, multi-channel optical fiber array, 3, laser chip, 4, collimating lens, 5, optical isolator, 6, converging lens, 7, ceramic heat sink. DETAILED DESCRIPTION

[0026] 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.

[0027] Example 1

[0028] 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.

[0029] Example 2

[0030] like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1, specifically as follows:

[0031] 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.

[0032] When the DR4 silicon optical chip 1 is applied in a 400G silicon optical engine, the laser chip 3, the collimating lens 4, the optical isolator 5 and the converging lens 6 can be horizontally distributed at 0 degrees, since the laser chip 3 is horizontally distributed at 0 degrees, it is convenient to paste the laser chip 3, and the pasting efficiency and accuracy are improved, and since the collimating lens 4, the optical isolator 5 and the converging lens 6 are horizontally distributed at 0 degrees, it is convenient to couple, and the coupling efficiency is guaranteed to be the highest.

[0033] Further, in the embodiment, the end surface of the input waveguide 130 is inclined at an angle of 8°, the optical surface 111 is inclined at an angle of 8°, the input waveguide 130 is made of silica with a refractive index of 1.45, the input waveguide 130 is perpendicular to the optical surface 111 at an angle of 5.508°, and the input waveguide 130 is inclined at an angle of 8°-5.508°=2.492° relative to the horizontal line. Of course, this is only an exemplary description. When the end surface of the input waveguide 130 is not changed and the refractive index of the input waveguide 130 is changed, the input waveguide 130 will also change the angle relative to the optical surface 111.

[0034] Embodiment 3

[0035] As shown in the figure, the embodiment is a further improvement based on the embodiments 1 or 2, and the specific improvements are as follows: Figure 2 The chip body 110 is provided with at least two mark points 140 on both sides of the input waveguide 130 with horizontal light as the symmetrical line. The at least two can refer to two, three, four, etc. When the DR4 silicon optical chip 1 is applied in a 400G silicon optical engine, the symmetrical line of the mark points 140 can be used as the pasting position of the laser chip 3, which is convenient for pasting. The figure shows that the chip body 110 is provided with two mark points 140 on both sides of the input waveguide 130 with horizontal light as the symmetrical line. Of course, this is only an exemplary example, and other quantities are not excluded in actual application.

[0036] Embodiment 4

[0037] As shown in the figure, the embodiment is a further improvement based on the embodiments 1 or 2 or 3, and the specific improvements are as follows:

[0038] Figure 2

[0039] ​​The input waveguide 130 is coupled with an input of a first 1x2 coupler 150, two outputs of the first 1x2 coupler 150 are respectively coupled with inputs of two second 1x2 couplers 160, then there are two second 1x2 couplers 160, each output of each second 1x2 coupler 160 is respectively coupled with an output waveguide 120 through an MZM modulator 170, then there are four MZM modulators 170, the first 1x2 coupler 150 and the second 1x2 coupler 160 are both in equal proportion, so that the light emitted from the input waveguide 130 can be divided into four output waveguides 120 in equal proportion.

[0040] Embodiment 5

[0041] As shown in Figure 2 , Figure 3 , a 400G silicon light engine includes a multi-channel fiber array 2 and a DR4 silicon light chip 1 as in any one of embodiments 1-4, the end face of the multi-channel fiber array 2 is a 0-degree face, the 0-degree face of the multi-channel fiber array 2 is attached to the optical face 111 of the DR4 silicon light chip 1, and the multi-channel fiber array 2 is coupled with the four output waveguides 120 on the DR4 silicon light chip 1; since the DR4 silicon light chip 1 has an optical face 111 tilted by 8°±0.1°, and the output waveguides 120 are perpendicular to and intersect with the optical face 111, the end face of the multi-channel fiber array 2 used can be a 0-degree face, effectively improving the grinding efficiency of the multi-channel fiber array 2, reducing angle errors, and improving coupling efficiency.

[0042] Embodiment 6

[0043] As shown in Figure 2 , Figure 3 , this embodiment is a further improvement based on embodiment 5, as follows:

[0044] The input waveguide 130 on the DR4 silicon light chip 1 is coupled with a 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 light chip 1.

[0045] 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 light propagation direction, the converging lens 6 is coupled with the input waveguide 130 on the DR4 silicon light chip 1, and the laser chip 3 is fixed on a ceramic heat sink 7; when the DR4 silicon light chip 1 is the DR4 silicon light chip 1 described in embodiment 2, the laser chip 3, the collimating lens 4, the optical isolator 5, and the converging lens 6 are all distributed horizontally at 0 degrees, since the laser chip 3 is distributed horizontally at 0 degrees, it is convenient to paste it, and the collimating lens 4, the optical isolator 5, and the converging lens 6 are distributed horizontally at 0 degrees, which is convenient for coupling.

[0046] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that variations, modifications, substitutions and changes can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A 400G silicon photonic engine, characterized in that, The application relates to a multi-channel fiber array (2) and a DR4 silicon optical chip (1), wherein the end face of the multi-channel fiber array (2) is a 0-degree face, the DR4 silicon optical chip (1) comprises a chip main body (110), one side of the chip main body (110) is an optical face (111) with an inclination of 8 DEG + / - 0.1 DEG, four output waveguides (120) which are perpendicular to the optical face (111) and intersect with the optical face (111) are arranged side by side on the chip main body (110), each output waveguide (120) is inclined to the horizontal line by 8 DEG + / - 0.1 DEG, an input waveguide (130) which intersects with the optical face (111) is arranged on the chip main body (110), and the input waveguide (130) is coupled with the four output waveguides (120) respectively; the 0-degree face of the multi-channel fiber array (2) is attached to the optical face (111) of the DR4 silicon optical chip (1), and the multi-channel fiber array (2) is coupled with the four output waveguides (120) on the DR4 silicon optical chip (1). The input waveguide (130) is inclined to the horizontal line, and satisfies the formula: Sin (a) * n1 = sin (b) * n2, wherein a is the inclination of the end face of the input waveguide (130), n1 is the air refractive index and is 1, b is the angle between the input waveguide (130) and the vertical line of the optical face (111), and n2 is the refractive index of the input waveguide (130). 2.The 400G silicon photonic engine of claim 1, wherein, The inclination of the end face of the input waveguide (130) is 8 DEG, 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 vertical line of the optical face (111) is 5.508 DEG. 3.The 400G silicon photonic engine of claim 2, wherein, At least two mark points (140) are arranged on the chip main body (110) on both sides of the input waveguide (130) with the horizontal light as the symmetry line.

4. The 400G silicon optical engine of claim 2 or 3, wherein, Two mark points (140) are arranged on the chip main body (110) on both sides of the input waveguide (130) with the horizontal light as the symmetry line.

5. The 400G silicon photonic engine of claim 4, wherein, The input waveguide (130) is coupled with the input of a first 1*2 coupler (150), the two outputs of the first 1*2 coupler (150) are coupled with the inputs of two second 1*2 couplers (160) respectively, and each output of each second 1*2 coupler (160) is coupled with an output waveguide (120) through an MZM modulator (170).

6. The 400G silicon photonic engine of claim 1, wherein, The input waveguide (130) on the DR4 silicon optical chip is coupled with a light emitting end.

7. The 400G silicon photonic engine of claim 1, wherein, The light emitting end comprises a laser chip (3), a collimating lens (4), an optical isolator (5) and a converging lens (6) which are arranged in the order of 0 degrees along the light propagation direction, and the converging lens (6) is coupled with the input waveguide (130) on the DR4 silicon optical chip. 8.The 400G silicon photonic engine of claim 7, wherein, The laser chip (3) is fixed on a ceramic heat sink (7).

9. The 400G silicon photonic engine of claim 8, wherein, ​

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