An 800G DR8 silicon photonic module and coupling method

Abstract

The present invention relates to an 800G DR8 silicon photonics module, in which a first converging lens and a second converging lens are arranged side by side. The light-entering side of the first converging lens is sequentially coupled to a first collimating lens and a first light-emitting assembly. The light-entering side of the second converging lens is sequentially coupled to a second collimating lens and a second light-emitting assembly. The light-emitting side of a polarization-independent optical isolator is coupled to two light-entering waveguides of a silicon photonics chip. The light converged by the second converging lens is narrowed by the optical device and then coupled in parallel to the same polarization-independent optical isolator after the distance between the light converged by the first converging lens and the second light converged by the second converging lens is reduced. The beneficial effects are: the number of polarization-independent optical isolators is reduced from two to one, the problem of double patching and magnetic repulsion between adjacent channels is eliminated, and the overall size of the polarization-independent optical isolator used is smaller, thereby reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of optical modules, and in particular to an 800G DR8 silicon photonic module and a coupling method. Background Art

[0002] The structure of the traditional 800G DR8 silicon photonic module is as follows Figure 1 As shown, it includes: a silicon photonic chip, two collimating lenses, two polarization-independent optical isolators, two converging lenses, two optical emitting components and a multi-channel optical fiber array. The silicon photonic chip has two input waveguides and eight output waveguides. Four of the eight output waveguides are coupled with one of the two input waveguides, and the other four output waveguides are coupled with the other input waveguide, that is, each input waveguide adopts a 1-to-4 scheme. The emitted light of one of the two optical emitting components is sequentially coupled into one of the input waveguides of the silicon photonic chip through a collimating lens, a polarization-independent optical isolator and a converging lens, while the emitted light of the other optical emitting component is sequentially coupled into the other input waveguide of the silicon photonic chip through a collimating lens, a polarization-independent optical isolator and a converging lens. The eight output waveguides of the silicon photonic chip are coupled with the multi-channel optical fiber array. In order to improve the coupling tolerance, a dual-lens solution is adopted, that is, the collimating lens first collimates the emitted light of the optical emitting component, and then the collimated light is coupled into the converging lens through the polarization-independent optical isolator. Finally, the converging lens converges the collimated light into the optical input waveguide of the silicon photonic chip. Since the minimum size of the collimating lens is generally 0.6mm, a space for overflow glue must be reserved between two adjacent collimating lenses. The gap is usually 0.4mm, so the center distance between the optical axes of two adjacent optical emitting components is 1mm. The number of polarization-independent optical isolators is two. Since the two polarization-independent optical isolators have the problem of magnetic repulsion, the patch efficiency is relatively affected. The polarization-independent optical isolator is also relatively expensive, and the patch needs to be mounted twice. Considering the overflow glue problem of the collimating lens, polarization-independent optical isolator and converging lens, the three materials must have an appropriate gap in the direction of light propagation, resulting in a relatively large overall space, which causes a tight PCB board layout space. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an 800G DR8 silicon photonic module and a coupling method 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: An 800G DR8 silicon photonic module includes: a polarization-independent optical isolator and a first converging lens and a second converging lens distributed side by side, the light incident side of the first converging lens is coupled to the first collimating lens and the first light emitting component in sequence, the light incident side of the second converging lens is coupled to the second collimating lens and the second light emitting component in sequence, the light output side of the polarization-independent optical isolator is coupled to the two light input waveguides of the silicon photonic chip, and the converged light converged by the second converging lens is reduced in distance from the converged light converged by the first converging lens under the action of the optical device, and then coupled in parallel with each other into the same polarization-independent optical isolator.

[0005] The beneficial effects of the present invention are:

[0006] The number of polarization-independent optical isolators is reduced from two to one, so there is no problem of double patching and magnetic repulsion between adjacent channels, which does not affect the patch efficiency. Since the spacing between the two parallel converging lights is reduced, the overall size of the polarization-independent optical isolator used is smaller, thereby reducing costs. In addition, there is no need to consider the problem of glue overflow of the polarization-independent optical isolator, the first converging lens, and the second converging lens, so that the space occupied by the polarization-independent optical isolator, the first converging lens, the second converging lens, the first collimating lens, and the second collimating lens is reduced, effectively alleviating the problem of tight PCB board layout space. When the spacing between the two parallel converging lights is reduced, the spacing between the two input waveguides of the silicon photonic chip will also be reduced. Since the spacing between the two input waveguides of the silicon photonic chip is reduced, the size of the silicon photonic chip can be reduced, thereby reducing costs.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the optical axis center distance between the first light emitting component and the second light emitting component is 1mm, the distance between the two parallel converging lights is reduced to 0.4mm~0.55mm, and the distance between the two light input waveguides of the silicon photonic chip is 0.4mm~0.55mm.

[0009] The above-mentioned further beneficial effect is that in the present invention, the spacing between the two parallel converging lights always satisfies the requirement of being greater than or equal to the spot diameter. If the reduced size is not large, the reduction in the size of the polarization-independent optical isolator is not obvious, and thus the effect on reducing costs is not obvious. Since the spacing is reduced to 0.4mm~0.55mm, the overall size of the polarization-independent optical isolator used is smaller, thereby reducing costs. In addition, the number of polarization-independent optical isolators is reduced from two to one, so there is no problem of double patching and magnetic repulsion between adjacent channels. The spacing between the two light input waveguides of the silicon photonic chip is 0.4mm~0.55mm. Since the spacing between the two light input waveguides of the silicon photonic chip is reduced from 1mm to 0.4mm~0.55mm, the size of the silicon photonic chip can be reduced, thereby reducing costs.

[0010] Furthermore, the spacing between the two parallel converging lights is reduced to 0.5mm, and the spacing between the two light input waveguides of the silicon photonic chip is 0.5mm.

[0011] A further beneficial effect of the above method is that the distance between the two parallel converged light beams and the distance between the two light input waveguides can be reduced by half.

[0012] Furthermore, the first light emitting assembly includes: a first ceramic heat sink and a first laser chip integrated on the first ceramic heat sink.

[0013] Furthermore, the second optical emission assembly includes: a second ceramic heat sink and a second laser chip integrated on the second ceramic heat sink.

[0014] Furthermore, the silicon photonic chip has eight output waveguides, four of which are coupled to one of the two input waveguides, and the other four are coupled to the other input waveguide. The eight output waveguides of the silicon photonic chip are edge-coupled with the multi-channel optical fiber array.

[0015] Furthermore, the optical device includes: a first 45-degree reflecting prism and a second 45-degree reflecting prism, the first 45-degree reflecting prism is integrated on the side of the first converging lens close to the second converging lens; the second 45-degree reflecting prism is integrated on the second converging lens and faces the light incident side of the second converging lens; the 45-degree reflecting surface of the first 45-degree reflecting prism is parallel to the 45-degree reflecting surface of the second 45-degree reflecting prism, and the converged light converged by the second converging lens is reflected by the 45-degree reflecting surface of the second 45-degree reflecting prism and turned 90° and incident on the 45-degree reflecting surface of the first 45-degree reflecting prism, and then reflected by the 45-degree reflecting surface of the first 45-degree reflecting prism and turned 90° and coupled into the polarization-independent optical isolator.

[0016] The further beneficial effect of adopting the above method is that the solution does not add any additional prisms, but only integrates the prisms on the converging lens. In addition, the lens with integrated prisms can be produced in large quantities at low cost using a die-casting mold. Because the prisms are integrated with the lenses, there is no problem of glue overflowing from the separate prisms and lenses, and the space is the most compact.

[0017] Furthermore: the first converging lens and the first 45-degree reflecting prism are made of the same material, and the refractive index is greater than 1.7; the second converging lens and the second 45-degree reflecting prism are made of the same material, and the refractive index is greater than 1.7.

[0018] The above further beneficial effect is that the lens and the prism are made of the same material and have a refractive index greater than 1.7. According to Sin(45°)×1.7>sin(90°)×1, 1.7 is the refractive index of the lens and 1 is the refractive index of air, so the 45° surface of the prism can achieve total reflection without the need for a reflective film.

[0019] Based on the above technical solution, the present invention also provides an 800G DR8 silicon photonic module coupling method, which couples the above 800G DR8 silicon photonic module, including the following steps:

[0020] S1, fixing the silicon photonic chip, the first light emitting component and the second light emitting component at predetermined positions;

[0021] S2, sequentially coupling a first collimating lens, a first converging lens, and a polarization-independent optical isolator along the light propagation direction in the optical path between the first optical emitting assembly and the silicon photonic chip, so that the converged light is coupled into one of the optical input waveguides of the silicon photonic chip through the polarization-independent optical isolator;

[0022] S3. In the optical path between the second optical emitting component and the polarization-independent optical isolator, a second collimating lens and a second converging lens are coupled in sequence along the light propagation direction, and the converged light is reflected by the 45-degree reflecting surface of the second 45-degree reflecting prism and turned 90° before being incident on the 45-degree reflecting surface of the first 45-degree reflecting prism. The converged light is then reflected by the 45-degree reflecting surface of the first 45-degree reflecting prism and turned 90° and coupled into the polarization-independent optical isolator. Finally, the converged light is coupled into another optical input waveguide of the silicon photonic chip by the polarization-independent optical isolator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of an 800G DR8 silicon photonics module in the prior art.

[0024] Figure 2 This is a structural diagram of the 800G DR8 silicon photonic module in the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0026] 1. Polarization-independent optical isolator, 2. First converging lens, 3. Second converging lens, 4. First collimating lens, 5. First light emitting assembly, 510. First ceramic heat sink, 520. First laser chip, 6. Second collimating lens, 7. Second light emitting assembly, 710. Second ceramic heat sink, 720. Second laser chip, 8. Silicon photonic chip, 810. Input light waveguide, 820. Output light waveguide, 9. First 45-degree reflecting prism, 10. Second 45-degree reflecting prism, 11. Multi-channel optical fiber array. DETAILED DESCRIPTION

[0027] 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.

[0028] Example 1

[0029] like Figure 2 As shown, an 800G DR8 silicon photonics module includes: a polarization-independent optical isolator 1, a first converging lens 2, and a second converging lens 3, wherein the first converging lens 2 and the second converging lens 3 are arranged side by side;

[0030] The light incident side of the first converging lens 2 is sequentially coupled to the first collimating lens 4 and the first light emitting assembly 5. The light beam emitted by the first light emitting assembly 5 is first collimated by the first collimating lens 4, and then converged by the first converging lens 2 to transform into converged light. The light incident side of the second converging lens 3 is sequentially coupled to the second collimating lens 6 and the second light emitting assembly 7. The light beam emitted by the second light emitting assembly 7 is first collimated by the second collimating lens 6, and then converged by the second converging lens 3 to transform into converged light. The two paths of collimated light are parallel light.

[0031] The light-emitting side of the polarization-independent optical isolator 1 is coupled to the two light-input waveguides 810 of the silicon photonic chip 8. An optical device is coupled between the first converging lens 2 and the second converging lens 3. The converged light beams converged by the second converging lens 3 are converged by the optical device, and the distance between the converged light beams and the converged light beams converged by the first converging lens 2 is reduced by the optical device. The converged light beams are then coupled parallel to each other into the same polarization-independent optical isolator 1. The two converged light beams are then coupled into the two light-input waveguides 810 of the silicon photonic chip 8 through the same polarization-independent optical isolator 1.

[0032] The number of polarization-independent optical isolators 1 is reduced from two to one, so there is no problem of double patching and magnetic repulsion between adjacent channels, which does not affect the patch efficiency. Since the spacing between the two parallel converging lights is reduced, the overall size of the polarization-independent optical isolator 1 used is smaller, thereby reducing costs. In addition, there is no need to consider the problem of glue overflow of the polarization-independent optical isolator 1, the first converging lens 2 and the second converging lens 3, so that the overall space occupied by the polarization-independent optical isolator 1, the first converging lens 2, the second converging lens 3, the first collimating lens 4 and the second collimating lens 6 is reduced, effectively alleviating the problem of tight PCB board layout space. When the spacing between the two parallel converging lights is reduced, the spacing between the two light input waveguides 810 of the silicon photonic chip 8 will also be reduced. Since the spacing between the two light input waveguides 810 of the silicon photonic chip 8 is reduced, the size of the silicon photonic chip 8 can be reduced, thereby reducing costs.

[0033] Example 2

[0034] like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1, specifically as follows:

[0035] The optical axis center distance between the first light emitting component 5 and the second light emitting component 7 is 1mm, and the distance between the two parallel converged lights is reduced to 0.4mm-0.55mm. Since the spot diameter is generally 0.4mm and above, the distance between the two parallel converged lights after reduction cannot be too small, so it is selected to be 0.4mm-0.55mm. In the present invention, the distance between the two parallel converged lights always satisfies the requirement of being greater than or equal to the spot diameter. If the reduced size is not large, the reduction in the size of the polarization-independent optical isolator 1 is not obvious, and thus the effect of reducing the cost is not obvious. The spacing is reduced to 0.4mm~0.55mm, so the overall size of the polarization-independent optical isolator 1 used is smaller, thereby reducing costs. In addition, the number of polarization-independent optical isolators 1 is reduced from two to one, so there is no problem of double patching and magnetic repulsion between adjacent channels. The spacing between the two light input waveguides 810 of the silicon photonic chip 8 is 0.4mm~0.55mm. Since the spacing between the two light input waveguides 810 of the silicon photonic chip 8 is reduced from 1mm to 0.4mm~0.55mm, the size of the silicon photonic chip 8 can be reduced, thereby reducing costs.

[0036] Furthermore, the spacing between the two parallel converging lights is reduced to 0.5 mm, that is, the spacing is reduced by 1 time, and the spacing between the two light input waveguides 810 of the silicon photonic chip 8 is 0.5 mm, that is, the spacing is reduced by 1 time.

[0037] Example 3

[0038] like Figure 2As shown, this embodiment is a further improvement on the basis of embodiment 1 or 2, specifically as follows:

[0039] The first light emitting assembly 5 includes: a first ceramic heat sink 510 and a first laser chip 520 integrated on the first ceramic heat sink 510;

[0040] The second optical emission assembly 7 includes a second ceramic heat sink 710 and a second laser chip 720 integrated on the second ceramic heat sink 710 .

[0041] Example 4

[0042] like Figure 2 As shown, this embodiment is a further improvement on the basis of any one of the embodiments 1 to 3, and the details are as follows:

[0043] The silicon photonic chip 8 has eight output waveguides 820, four of which are coupled with one of the two input waveguides 810, and the other four are coupled with the other input waveguide 810, that is, each input waveguide 810 adopts a 1-to-4 solution. The eight output waveguides 820 of the silicon photonic chip 8 are coupled with the multi-channel optical fiber array 11. Since the silicon photonic chip 8 has eight output waveguides 820, theoretically the number of channels of the multi-channel optical fiber array 11 can be greater than eight.

[0044] Example 5

[0045] like Figure 2 As shown, this embodiment is a further improvement on the basis of any one of the embodiments 1 to 4, specifically as follows:

[0046] The optical device includes: a first 45-degree reflecting prism 9 and a second 45-degree reflecting prism 10, the first 45-degree reflecting prism 9 is integrated on the side of the first converging lens 2 close to the second converging lens 3, and the second 45-degree reflecting prism 10 is integrated on the second converging lens 3, and the second 45-degree reflecting prism 10 is directly opposite to the light incident side of the second converging lens 3; the 45-degree reflecting surface of the first 45-degree reflecting prism 9 is parallel to the 45-degree reflecting surface of the second 45-degree reflecting prism 10, and the converged light converged by the second converging lens 3 is reflected by the 45-degree reflecting surface of the second 45-degree reflecting prism 10, turned 90° and incident on the 45-degree reflecting surface of the first 45-degree reflecting prism 9, and then reflected by the 45-degree reflecting surface of the first 45-degree reflecting prism 9. The reflected light is turned 90° and coupled into the polarization-independent optical isolator 1. The converged light reflected by the 45-degree reflective surface of the first 45-degree reflecting prism 9 is parallel to the converged light converged from the first converging lens 2. This solution does not add an additional prism, but only integrates the prism on the converging lens, thereby achieving the purpose of reducing one polarization-independent optical isolator 1 without increasing the number of couplings. Since the number of polarization-independent optical isolators 1 is reduced to one, the number of couplings can be reduced, the coupling time can be shortened, the production efficiency can be improved, and the structure is more compact. In addition, this lens with integrated prism can be mass-produced at low cost using a die-casting mold. Because the prism is integrated with the lens, there is no problem of glue overflow between the separate prisms and lenses, and the space is the most compact.

[0047] Furthermore: the first converging lens 2 is made of the same material as the first 45-degree reflecting prism 9, and the refractive index is greater than 1.7; the second converging lens 3 is made of the same material as the second 45-degree reflecting prism 10, and the refractive index is greater than 1.7. The materials of the lens and the prism are the same, and the refractive index is greater than 1.7. According to Si n(45°)×1.7>sin(90°)×1, 1.7 is the refractive index of the lens, and 1 is the refractive index of air, so the 45° surface of the prism can achieve total reflection without the need for reflective coating.

[0048] Example 6

[0049] A method for coupling an 800G DR8 silicon photonic module includes the following steps:

[0050] S1, fixing the silicon photonic chip 8, the first light emitting component 5 and the second light emitting component 7 at predetermined positions;

[0051] S2, sequentially coupling the first collimating lens 4, the first converging lens 2, and the polarization-independent optical isolator 1 along the light propagation direction in the optical path between the first optical emitting assembly 5 and the silicon photonic chip 8, so that the converged light is coupled into one of the optical input waveguides 810 of the silicon photonic chip 8 through the polarization-independent optical isolator 1;

[0052] S3, in the optical path between the second optical emitting assembly 7 and the polarization-independent optical isolator 1, the second collimating lens 6 and the second converging lens 3 are sequentially coupled along the light propagation direction, and the converged light is reflected by the 45-degree reflecting surface of the second 45-degree reflecting prism 10, turned 90°, and then incident on the 45-degree reflecting surface of the first 45-degree reflecting prism 9. The converged light is then reflected by the 45-degree reflecting surface of the first 45-degree reflecting prism 9, turned 90°, and coupled into the polarization-independent optical isolator 1. Finally, the converged light is coupled by the polarization-independent optical isolator 1 into another optical input waveguide 810 of the silicon photonic chip 8;

[0053] S4, coupling the multi-channel optical fiber array 11.

[0054] 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. An 800G DR8 silicon photonics module, characterized in that: include: A polarization-independent optical isolator (1) and a first converging lens (2) and a second converging lens (3) arranged side by side, wherein the light-entering side of the first converging lens (2) is sequentially coupled to a first collimating lens (4) and a first light-emitting component (5), and the light-entering side of the second converging lens (3) is sequentially coupled to a second collimating lens (6) and a second light-emitting component (7), and the light-emitting side of the polarization-independent optical isolator (1) is coupled to two light-entering waveguides (810) of a silicon photonic chip (8), and the converged light converged by the second converging lens (3) is coupled to the same polarization-independent optical isolator (1) in parallel after the distance between the converged light converged by the first converging lens (2) and the converged light converged by the second converging lens (3) is reduced under the action of an optical device.

2. The 800G DR8 silicon photonic module according to claim 1, wherein: The optical axis center distance between the first light emitting component (5) and the second light emitting component (7) is 1 mm, the distance between the two parallel converged lights is reduced to 0.4 mm to 0.55 mm, and the distance between the two light input waveguides (810) of the silicon photonic chip (8) is 0.4 mm to 0.55 mm.

3. The 800G DR8 silicon photonic module according to claim 2, wherein: The spacing between the two parallel converged lights is reduced to 0.5 mm, and the spacing between the two light input waveguides (810) of the silicon photonic chip (8) is 0.5 mm.

4. The 800G DR8 silicon photonic module according to claim 1, wherein: The first light emitting assembly (5) comprises: a first ceramic heat sink (510) and a first laser chip (520) integrated on the first ceramic heat sink (510).

5. The 800G DR8 silicon photonic module according to claim 1, wherein: The second light emitting assembly (7) comprises: a second ceramic heat sink (710) and a second laser chip (720) integrated on the second ceramic heat sink (710).

6. The 800G DR8 silicon photonic module according to claim 1, wherein: The silicon photonic chip (8) has eight output light waveguides (820), four of the eight output light waveguides (820) are coupled to one input light waveguide (810) of the two input light waveguides (810), and the other four output light waveguides (820) are coupled to the other input light waveguide (810). The eight output light waveguides (820) of the silicon photonic chip (8) are edge-coupled to a multi-channel optical fiber array (11).

7. The 800G DR8 silicon photonic module according to any one of claims 1 to 6, characterized in that: The optical device comprises: a first 45-degree reflecting prism (9) and a second 45-degree reflecting prism (10), wherein the first 45-degree reflecting prism (9) is integrated on a side of the first converging lens (2) close to the second converging lens (3); the second 45-degree reflecting prism (10) is integrated on the second converging lens (3) and faces the light incident side of the second converging lens (3); the 45-degree reflecting surface of the first 45-degree reflecting prism (9) is parallel to the 45-degree reflecting surface of the second 45-degree reflecting prism (10), and a path of converged light converged by the second converging lens (3) is reflected by the 45-degree reflecting surface of the second 45-degree reflecting prism (10) and turned 90 degrees and incident on the 45-degree reflecting surface of the first 45-degree reflecting prism (9), and then reflected by the 45-degree reflecting surface of the first 45-degree reflecting prism (9) and turned 90 degrees and coupled into the polarization-independent optical isolator (1).

8. The 800G DR8 silicon photonic module according to claim 7, characterized in that: The first converging lens (2) and the first 45-degree reflecting prism (9) are made of the same material, and the refractive index is greater than 1.7; the second converging lens (3) and the second 45-degree reflecting prism (10) are made of the same material, and the refractive index is greater than 1.

7.

9. A 800G DR8 silicon photonic module coupling method, characterized in that: Coupling the 800GDR8 silicon photonics module according to claim 7 or 8 comprises the following steps: S1, fixing the silicon photonic chip (8), the first light emitting component (5), and the second light emitting component (7) at predetermined positions; S2, sequentially coupling a first collimating lens (4), a first converging lens (2), and a polarization-independent optical isolator (1) along a light propagation direction in an optical path between the first light emitting component (5) and the silicon photonic chip (8), so that the converged light is coupled into one of the light input waveguides (810) of the silicon photonic chip (8) through the polarization-independent optical isolator (1); S3, in the optical path between the second optical emitting component (7) and the polarization-independent optical isolator (1), the second collimating lens (6) and the second converging lens (3) are coupled in sequence along the light propagation direction, and the converged light is reflected by the 45-degree reflection surface of the second 45-degree reflection prism (10) and turned 90 degrees before being incident on the 45-degree reflection surface of the first 45-degree reflection prism (9), and then reflected by the 45-degree reflection surface of the first 45-degree reflection prism (9) and turned 90 degrees and coupled into the polarization-independent optical isolator (1), and finally coupled into another light input waveguide (810) of the silicon photonic chip (8) by the polarization-independent optical isolator (1).

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