800G 2XFR4 silicon light engine
By using a combination of array convergence lens and collimator lens in the 800G 2XFR4 silicon light and light engine, combined with the design of an integrated optical isolator, the problems of long coupling time, tight space and magnetic repulsion of traditional light engines are solved, achieving more efficient and compact base design.
Patent Information
- Application Number
- CN202421416191.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-06-19
AI Technical Summary
The traditional 800G 2XFR4 silicon optical engine takes a long time during the coupling process, the large number of lenses leads to tight space in the layout of the PCB board, and the magnetic forces of the optical isolators repel each other and affect the efficiency of the patch.
The combination of array convergence lenses and four collimating lenses is adopted to reduce the number of couplings and an integrated optical isolator is introduced in the light engine, located in the convergence light path to save space and glued with the array convergence lens to avoid glue overflow problems.
It shortens coupling time, reduces the number of lenses, saves base space, improves patch efficiency, and avoids magnetic repulsion problems, suitable for compact PCB board layout.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical engines, and in particular to an 800G 2XFR4 silicon photonic engine. Background Art
[0002] The traditional 800G 2XFR4 silicon photonic engine includes: a base, a silicon photonic chip and four ceramic heat sinks with laser chips fixed on the base. The wavelengths of the four laser chips are different. The silicon photonic chip has four input waveguides and two output waveguides. Each laser chip is coupled to one of the input waveguides of the silicon photonic chip in sequence along the light propagation direction. A collimating lens, an optical isolator and a converging lens are coupled, that is, it has four collimating lenses, four optical isolators and four converging lenses. The two output waveguides of the silicon photonic chip are coupled with a dual-channel optical fiber array. The above structure is as follows: Figure 1 As shown, in this scheme, each laser chip has 2 paths, that is, it is equally divided into 2 paths, and in order to improve the coupling tolerance, a double-lens scheme is adopted, that is, the collimating lens first collimates the divergent light of the laser chip, and then the converging lens converges the collimated light into the optical waveguide of the silicon photonic chip. This scheme has 8 lenses (four collimating lenses and four converging lenses), so it is necessary to couple 8 times, which is time-consuming. In addition, there are four optical isolators, and the patch must be mounted four times. Since adjacent optical isolators have magnetic repulsion problems, the patch efficiency is affected. In addition, considering the overflow of the collimating lens, optical isolator, and converging lens, the three materials should have an appropriate gap. Therefore, the overall space occupied is relatively large, which leads to tight space for PCB board layout. Utility Model Content
[0003] The technical problem to be solved by the present invention is to provide an 800G 2XFR4 silicon photonic engine to overcome the deficiencies in the above-mentioned prior art.
[0004] The utility model provides a technical solution to the above technical problems as follows: an 800G 2XFR4 silicon photonic engine, comprising: a base, on which a silicon photonic chip and four ceramic heat sinks with laser chips are fixed, the four laser chips are coupled one by one with four light input waveguides of the silicon photonic chip through an array converging lens, the array converging lens is fixed to the base, and a collimating lens is coupled between each laser chip and the array converging lens on the base.
[0005] The beneficial effects of the utility model are as follows: since the spacing accuracy of the light input waveguides of the silicon photonic chip is high, the spacing of the array converging lenses is also large, and the coupling tolerance of the converging lenses is large, an array converging lens can be used, while the collimating lens cannot be in array form (the laser chip patch error is very large, usually above ±5um, and the coupling tolerance of the collimating lens is very small). Therefore, the number of lenses in the new scheme is five (four collimating lenses and one array converging lens), so only five couplings are required during coupling, which is three fewer couplings than the original scheme, and the coupling time is greatly shortened. Since the collimating lens is not in array form, the problem of reduced coupling efficiency caused by the tolerance of the array converging lens can be adjusted back through a single collimating lens in the subsequent coupling process.
[0006] On the basis of the above technical solution, the present invention can also be improved as follows.
[0007] Furthermore, an integrated optical isolator is coupled between the array converging lens and the light input waveguide of the silicon photonic chip.
[0008] The above further beneficial effect is that the integrated optical isolator is located in the converging optical path rather than in the parallel optical path, so that 1mm to 1.5mm of space can be saved, that is, the size of the entire base can be reduced, thereby making it more convenient for PCB board layout, and there is no problem of magnetic repulsion between the fourth patch and the adjacent channels.
[0009] Furthermore, the integrated optical isolator is glued together with the array converging lens.
[0010] A further beneficial effect of the above method is that there is no need to consider the safety gap for glue overflow.
[0011] Furthermore, the two light-emitting waveguides of the silicon photonic chip are coupled with a dual-channel optical fiber array.
[0012] Furthermore, the base is made of tungsten copper. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a structural diagram of an 800G 2XFR4 silicon photonics engine in the prior art;
[0014] Figure 2 This is a structural diagram of the 800G 2XFR4 silicon photonic engine in the present invention.
[0015] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0016] 1. Base, 2. Silicon photonic chip, 210. Input light waveguide, 220. Output light waveguide, 3. Laser chip, 4. Ceramic heat sink, 5. Array converging lens, 6. Collimating lens, 7. Integrated optical isolator, 8. Dual-channel optical fiber array. DETAILED DESCRIPTION
[0017] 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.
[0018] Example 1
[0019] like Figure 2 As shown, an 800G 2XFR4 silicon photonic engine comprises: a base 1, a silicon photonic chip 2 and four ceramic heat sinks 4 with laser chips 3 are fixed on the base 1, the wavelengths of the four laser chips 3 are different, and the four laser chips 3 are coupled one by one with four light input waveguides 210 of the silicon photonic chip 2 through an array converging lens 5, that is, the array converging lens 5 used is integrated by four converging lenses, the array converging lens 5 is fixed to the base 1, and a collimating lens 6 is coupled between each laser chip 3 and the array converging lens 5 on the base 1, that is, the number of collimating lenses 6 is four, and since the collimating lens 6 is in a non-array form, the problem of reduced coupling efficiency caused by the tolerance of the array converging lens 5 can be adjusted back through a single collimating lens 6 in the subsequent coupling process;
[0020] Since the spacing accuracy of the light input waveguide 210 of the silicon photonic chip 2 is high, the spacing of the array converging lens 5 is also large, and the coupling tolerance of the converging lens is large, the array converging lens 5 can be used, while the collimating lens 6 cannot be in array form (the patch error of the laser chip 3 is very large, usually above ±5um, and the coupling tolerance of the collimating lens 6 is very small). Therefore, the number of lenses in the new scheme is five (four collimating lenses 6 and one array converging lens 5), so only five couplings are required during coupling, which is three fewer couplings than the original scheme, and the coupling time is greatly shortened.
[0021] Example 2
[0022] like Figure 2 As shown, this embodiment is a further improvement on the basis of embodiment 1, and the details are as follows:
[0023] An integrated optical isolator 7 is coupled between the array converging lens 5 and the light input waveguide 210 of the silicon photonic chip 2, which can improve the optical performance of the optical engine. In addition, the integrated optical isolator 7 is located in the converging light path instead of the parallel light path, so it can save 1mm to 1.5mm of space, that is, the size of the entire base 1 can be reduced, thereby making it more convenient for PCB board layout, and there is no problem of magnetic repulsion between the fourth patch and the adjacent channels.
[0024] Example 3
[0025] like Figure 2As shown, this embodiment is a further improvement on the basis of embodiment 2, and the details are as follows:
[0026] The integrated optical isolator 7 is glued together with the array converging lens 5, and there is no need to consider the safety gap for glue overflow.
[0027] Example 4
[0028] 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:
[0029] The two light-emitting waveguides 220 of the silicon photonic chip 2 are coupled with the dual-channel optical fiber array 8 , that is, the light emitted by the silicon photonic chip 2 will be coupled into the dual-channel optical fiber array 8 . In addition, the base 1 is preferably made of tungsten copper.
[0030] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. An 800G 2XFR4 silicon photonics engine, characterized in that: include: A base (1) is provided, wherein a silicon photonic chip (2) and four ceramic heat sinks (4) with laser chips (3) are fixed on the base (1), wherein the four laser chips (3) are coupled one by one with four light input waveguides (210) of the silicon photonic chip (2) via an array convergence lens (5), wherein the array convergence lens (5) is fixed to the base (1), and a collimating lens (6) is coupled between each laser chip (3) and the array convergence lens (5) on the base (1).
2. The 800G 2XFR4 silicon photonics engine according to claim 1, characterized in that: An integrated optical isolator (7) is coupled between the array converging lens (5) and the light input waveguide (210) of the silicon photonic chip (2).
3. The 800G 2XFR4 silicon photonics engine according to claim 2, characterized in that: The integrated optical isolator (7) is glued together with the array converging lens (5).
4. The 800G 2XFR4 silicon photonics engine according to claim 1, characterized in that: The two light output waveguides (220) of the silicon photonic chip (2) are coupled to a dual-channel optical fiber array (8).
5. The 800G 2XFR4 silicon photonics engine according to claim 1, characterized in that: The base (1) is made of tungsten copper.