400G DR4 silicon optical chip and 400G DR4 silicon optical module
The 400G DR4 silicon photonic chip addresses weak MPD response by equally distributing light to MZM modulators and using passive auxiliary MPDs for alignment, simplifying the coupling process and eliminating the need for complex current amplification circuits.
Patent Information
- Application Number
- CN202422488678.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-10-14
AI Technical Summary
When traditional 400G DR4 silicon optical chips are used in 400G DR4 silicon optical modules, the optical power enters the MZM modulator, resulting in an increase in the complexity of the response circuit, especially in the aspheric lens coupling process, complex MPD current amplification circuit is required to read the optical power.
A 400G DR4 silicon optical chip is designed. The input waveguide has a light of less than or equal to 1% entering the MPD, and other light ratios are divided into four MZM modulators. Each branch on each output waveguide is coupled with a passive auxiliary MPD. The multi-channel optical fiber array position is fixed when the photocurrent is maximum, and the aspheric lens position is fixed when the optical power is maximum, simplifying the coupling process.
This enables coupling of aspheric lenses and multi-channel fiber arrays in the optimal position without the need for complex MPD current amplification circuit in the 400G DR4 silicon optical module, simplifying the coupling process and reducing circuit complexity.
Smart Images
Figure CN223108123U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical modules, and particularly relates to a 400G DR4 silicon optical chip and a 400G DR4 silicon optical module. Background Art
[0002] The structure of a traditional 400G DR4 silicon optical chip is as Figure 1 shown. It has an input waveguide. The input waveguide splits light less than or equal to 1% into an MPD (detector), and the other light (the remaining light greater than or equal to 99%) is split into a first 1×2 equal ratio coupler. The first 1×2 equal ratio coupler splits the light into two equal parts and couples them into two second 1×2 equal ratio couplers respectively. Each second 1×2 equal ratio coupler also splits the light into two equal parts. Since there are two second 1×2 equal ratio couplers, the other light will be equally split into four parts and then coupled into four MZM modulators. Then, the four MZM modulators are respectively coupled with four output waveguides. When this 400G DR4 silicon optical chip is applied to a 400G DR4 silicon optical module, in order to couple an aspheric lens on the light source input side, a part of the light in the input waveguide is distributed to the MPD to monitor the optical power coupled into the input waveguide. Due to the large insertion loss of the silicon optical chip, in order to ensure sufficient optical power to enter the MZM modulator, generally, the light distributed from the input waveguide to the MPD is ≤1%, resulting in a very weak response circuit of the MPD. Especially during the process of coupling and searching for light by the aspheric lens, the current of the MPD needs to be amplified to facilitate reading, thus increasing the circuit complexity. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a 400G DR4 silicon optical chip and a 400G DR4 silicon optical module to overcome the above deficiencies in the prior art.
[0004] The technical solution for the utility model to solve the above technical problem is as follows: A 400G DR4 silicon optical chip includes: an input waveguide. The input waveguide splits light less than or equal to 1% into an MPD, and the other light is equally split into four MZM modulators. The four MZM modulators are respectively coupled with four output waveguides. Each output waveguide is branched and coupled with a passive auxiliary MPD, and the light input direction of each passive auxiliary MPD is the reverse direction of the output waveguide.
[0005] The beneficial effects of the present utility model are as follows: When the 400G DR4 silicon photonics chip is applied to the coupling process of the 400G DR4 silicon photonics optical module, when determining the position of the multi-channel fiber array, the fibers of the multi-channel fiber array are externally connected to a light source, and the multi-channel fiber array is coupled with the output waveguide of the 400G DR4 silicon photonics chip. The multi-channel fiber array is fixed when the passive auxiliary MPD photocurrent of each channel is the largest; when determining the position of the aspheric lens, the fibers of the multi-channel fiber array are externally connected to an optical power meter, and the optical emission end and the optical isolator are coupled. The aspheric lens is coupled in a non-fixed manner, and the aspheric lens is fixed when the optical power collected by the optical power meter of each channel is the largest. Through this method, the coupling of the aspheric lens and the multi-channel fiber array in the 400G DR4 silicon photonics optical module is completed. Even when the 400G DR4 silicon photonics chip does not adopt a complex MPD current amplification circuit, when it is applied to the 400G DR4 silicon photonics optical module, the aspheric lens can be coupled in the optimal position.
[0006] Based on the above technical solution, the present utility model can also be improved as follows.
[0007] Further, less than or equal to 1% of the light reflected by each output waveguide enters a passive auxiliary MPD.
[0008] Further, the input waveguide is coupled with the input end of a first 1×2 ratio coupler, the output ends of the first 1×2 ratio coupler are respectively coupled with the input ends of two second 1×2 ratio couplers, and the four output ends of the two second 1×2 ratio couplers are respectively coupled with the input ends of four MZM modulators.
[0009] Based on the above technical solution, the present utility model also provides a 400G DR4 silicon photonics optical module, including: an optical emission end, an aspheric lens, an optical isolator, a multi-channel fiber array, and a 400G DR4 silicon photonics chip. The optical emission end is sequentially coupled with the input waveguide of the 400G DR4 silicon photonics chip through the aspheric lens and the optical isolator, and the multi-channel fiber array is coupled with the output waveguide of the 400G DR4 silicon photonics chip.
[0010] The further beneficial effects are as follows: During the coupling process of the 400G DR4 silicon photonics optical module, when determining the position of the multi-channel fiber array, the fibers of the multi-channel fiber array are externally connected to a light source, and the multi-channel fiber array is coupled with the output waveguides of the 400G DR4 silicon photonics chip. The multi-channel fiber array is fixed when the passive auxiliary MPD photocurrent of each channel is the largest; when determining the position of the aspherical lens, the fibers of the multi-channel fiber array are externally connected to an optical power meter, and the optical transmitter and the optical isolator are coupled. The aspherical lens is coupled in a non-fixed manner, and the aspherical lens is fixed when the optical power collected by the optical power meter of each channel is the largest. Through this method, the coupling of the aspherical lens and the multi-channel fiber array in the 400G DR4 silicon photonics optical module is completed, so that the aspherical lens can be coupled at the optimal position without using a complex MPD current amplification circuit.
[0011] Further, the optical transmitter includes: a ceramic heat sink and a laser chip integrated on the ceramic heat sink.
[0012] Further, the output waveguides are inclinedly distributed, and the end face of the multi-channel fiber array has the same inclination angle as the output waveguides.
[0013] Further, the multi-channel fiber array is a four-channel fiber array. Description of the Drawings
[0014] Figure 1 is a structural diagram of a 400G DR4 silicon photonics optical module in the prior art;
[0015] Figure 2 is a structural diagram of a 400G DR4 silicon photonics chip in the present invention;
[0016] Figure 3 is a structural diagram of a 400G DR4 silicon photonics optical module in the present invention;
[0017] Figure 4 is a structural diagram of the 400G DR4 silicon photonics optical module in the present invention when coupling the multi-channel fiber array;
[0018] Figure 5 is a structural diagram of the 400G DR4 silicon photonics optical module in the present invention when coupling the aspherical lens.
[0019] In the drawings, the list of components represented by each reference numeral is as follows:
[0020] 1. 400G DR4 silicon photonics chip, 110. Input waveguide, 120. MPD, 130. MZM modulator, 140. Output waveguide, 150. Passive auxiliary MPD, 160. First 1×2 ratio coupler, 170. Second 1×2 ratio coupler, 2. Optical emission end, 210. Ceramic heat sink, 220. Laser chip, 3. Aspherical lens, 4. Optical isolator, 5. Multichannel fiber array, 6. Light source, 7. Optical power meter. Detailed implementation mode
[0021] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.
[0022] Embodiment 1
[0023] As Figure 2 shown, a 400G DR4 silicon photonics chip includes:
[0024] An input waveguide 110, where the input waveguide 110 allows light less than or equal to 1% to enter an MPD (detector) 120, and the other light (the remaining light greater than or equal to 99%) is equally divided into four MZM modulators 130 in a ratio. The four MZM modulators 130 are respectively coupled to four output waveguides 140. Each output waveguide 140 branches and couples a passive auxiliary MPD 150. The light incident direction of each passive auxiliary MPD 150 is opposite to that of the output waveguide 140;
[0025] When the emitted light enters the input waveguide 110, the input waveguide 110 allows light less than or equal to 1% of the emitted light to enter an MPD 120, and then the remaining emitted light greater than or equal to 99% is equally divided into four paths and respectively coupled into the four MZM modulators 130. The light in the four MZM modulators 130 is then coupled into the four output waveguides 140, and finally coupled into the multichannel fiber array 5 by the four output waveguides 140. In this solution, since the light incident direction of each passive auxiliary MPD 150 is opposite to that of the output waveguide 140, the emitted light cannot be coupled into the passive auxiliary MPD 150;
[0026] When the multichannel fiber array 5 is coupled to the output waveguide 140 of the 400G DR4 silicon photonics chip and the fiber of the multichannel fiber array 5 is externally connected to a light source, the light emitted by the external light source is coupled into the output waveguide 140 through the multichannel fiber array 5. At this time, the output waveguide 140 will divide the light emitted by the external light source 6 into the passive auxiliary MPD 150;
[0027] The 400G DR4 silicon photonics chip 1 is applied in the coupling process of the 400G DR4 silicon photonics optical module. When determining the position of the multi-channel fiber array 5, the fiber of the multi-channel fiber array 5 is externally connected to a light source 6, and the multi-channel fiber array 5 is coupled with the output waveguide 140 of the 400G DR4 silicon photonics chip. The multi-channel fiber array 5 is fixed when the photocurrent of the passive auxiliary MPD 150 in each channel is the largest.
[0028] When determining the position of the aspheric lens 3, the fiber of the multi-channel fiber array 5 is externally connected to an optical power meter 7, and the optical transmitting end 2 and the optical isolator 4 are coupled. The aspheric lens 3 is coupled in a non-fixed manner. The aspheric lens 3 is fixed when the optical power collected by the optical power meter 7 in each channel is the largest. Through this method, the coupling of the aspheric lens 3 and the multi-channel fiber array 5 in the 400G DR4 silicon photonics optical module is completed. Therefore, even if the 400G DR4 silicon photonics chip 1 does not adopt a complex MPD current amplification circuit, when it is applied to the 400G DR4 silicon photonics optical module, the aspheric lens 3 can be coupled in the optimal position.
[0029] Embodiment 2
[0030] As Figure 2 shown, this embodiment is a further improvement on the basis of Embodiment 1, specifically as follows:
[0031] Each output waveguide 140 reversely divides less than or equal to 1% of the light into a passive auxiliary MPD 150, which can ensure that enough light enters the MZM modulator 130.
[0032] Embodiment 3
[0033] As Figure 2 shown, this embodiment is a further improvement on the basis of Embodiment 1 or 2, specifically as follows:
[0034] The input waveguide 110 is coupled with the input end of a first 1×2 ratio coupler 160. The output ends of the first 1×2 ratio coupler 160 are respectively coupled with the input ends of two second 1×2 ratio couplers 170. The four output ends of the two second 1×2 ratio couplers 170 are respectively coupled with the input ends of four MZM modulators 130. Specifically, other light (the remaining light greater than or equal to 99%) in the input waveguide 110 is divided into a first 1×2 ratio coupler 160. The first 1×2 ratio coupler 160 divides the light into two equal parts and couples them into two second 1×2 ratio couplers 170 respectively. Each second 1×2 ratio coupler 170 also divides the light into two equal parts. Since there are two second 1×2 ratio couplers 170, other light will be equally divided into four parts and then coupled into four MZM modulators 130.
[0035] Embodiment 4
[0036] As shown in Figure 3 , a 400G DR4 silicon photonics optical module includes: an optical transmitting end 2, an aspherical lens 3, an optical isolator 4, a multi-channel fiber array 5, and a 400G DR4 silicon photonics chip 1. The optical transmitting end 2 is sequentially coupled to the input waveguide 110 of the 400G DR4 silicon photonics chip 1 through the aspherical lens 3 and the optical isolator 4, that is, the emitted light emitted by the optical transmitting end 2 is sequentially coupled into the input waveguide 110 of the 400G DR4 silicon photonics chip 1 through the aspherical lens 3 and the optical isolator 4. The multi-channel fiber array 5 is coupled to the output waveguide 140 of the 400G DR4 silicon photonics chip 1. The light in the input waveguide 110 is equally divided into four paths and respectively coupled into four MZM modulators 130. The light in the four MZM modulators 130 is then coupled into four output waveguides 140, and finally coupled into the multi-channel fiber array 5 by the four output waveguides 140.
[0037] Embodiment 5
[0038] As shown in Figure 3 , this embodiment is a further improvement on Embodiment 4, specifically as follows:
[0039] The optical transmitting end 2 includes: a ceramic heat sink 210 and a laser chip 220 integrated on the ceramic heat sink 210. The emitted light emitted by the laser chip 220 is sequentially coupled into the input waveguide 110 of the 400G DR4 silicon photonics chip 1 through the aspherical lens 3 and the optical isolator 4.
[0040] Embodiment 6
[0041] As shown in Figure 3 , this embodiment is a further improvement on Embodiment 4 or 5, specifically as follows:
[0042] The output waveguides 140 are inclinedly distributed, and the end face of the multi-channel fiber array 5 has the same inclination angle as the output waveguides 140, reducing light reflection. In this solution, since there are only four output waveguides 140, the multi-channel fiber array 5 is preferably a four-channel fiber array.
[0043] As shown in Figure 4 , Figure 5 , a coupling method for a 400G DR4 silicon photonics optical module includes the following steps:
[0044] S1. Connect the optical fiber of the multi-channel optical fiber array 5 to an external light source 6, and couple the multiple channels of the multi-channel optical fiber array 5 with the multiple output waveguides 140 of the 400G DR4 silicon photonics chip 1. Fix the multi-channel optical fiber array 5 when the photocurrent of the passive auxiliary MPD150 in each channel is maximized. The principle is as follows: when each channel of the multi-channel optical fiber array 5 is aligned with each output waveguide 140 of the 400G DR4 silicon photonics chip 1, more light is coupled into each output waveguide 140 of the 400G DR4 silicon photonics chip 1, making the photocurrent of the passive auxiliary MPD150 maximum. The responsivity R of the passive auxiliary MPD150 is fixed, and the splitting ratio is also fixed. If not aligned, that is, not in the optimal position, the photocurrent of the passive auxiliary MPD150 will be relatively small. During the process of coupling the multi-channel optical fiber array 5, the optical transmitter 2 does not need to be coupled or operate.
[0045] S2. Connect the optical fiber of the multi-channel optical fiber array 5 to an optical power meter 7, couple the optical transmitter 2 and the optical isolator 4, and then couple the aspherical lens 3 in an unfixed manner. Fix the aspherical lens 3 when the optical power collected by the optical power meter 7 in each channel is maximized.
[0046] Using this coupling method enables the 400G DR4 silicon photonics chip 1 to couple the aspherical lens 3 in the optimal position even without a complex MPD current amplification circuit.
[0047] The optical power meter 7 uses a high-sensitivity optical power meter. Due to the use of a high-sensitivity optical power meter, it is very convenient to find light for the aspherical lens 3. Furthermore, the optical power meter 7 can detect light less than -50 dBm.
[0048] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.
Claims
1. A 400G DR4 silicon photonics chip, characterized in that, Comprising: An input waveguide (110), wherein the input waveguide (110) splits light less than or equal to 1% into an MPD (120), and the other light is equally divided into four MZM modulators (130) proportionally. The four MZM modulators (130) are respectively coupled to four output waveguides (140), and each output waveguide (140) is branch-coupled with a passive auxiliary MPD (150). The light input direction of each passive auxiliary MPD (150) is opposite to that of the output waveguide (140).
2. The 400G DR4 silicon photonics chip according to claim 1, wherein Each output waveguide (140) splits light less than or equal to 1% in the reverse direction into a passive auxiliary MPD (150).
3. A 400G DR4 silicon photonics chip according to claim 1, characterized in that, The input waveguide (110) is coupled to the input end of a first 1×2 proportional coupler (160), the output ends of the first 1×2 proportional coupler (160) are respectively coupled to the input ends of two second 1×2 proportional couplers (170), and the four output ends of the two second 1×2 proportional couplers (170) are respectively coupled to the input ends of the four MZM modulators (130).
4. A 400G DR4 silicon photonics optical module, characterized in that, Comprising: An optical emission end (2), an aspherical lens (3), an optical isolator (4), a multi-channel fiber array (5), and a 400G DR4 silicon photonics chip (1) according to any one of claims 1 to 3. The optical emission end (2) is sequentially coupled to the input waveguide (110) of the 400G DR4 silicon photonics chip (1) via the aspherical lens (3) and the optical isolator (4), and the multi-channel fiber array (5) is coupled to the output waveguide (140) of the 400G DR4 silicon photonics chip (1).
5. The 400G DR4 silicon photonics optical module according to claim 4, wherein The optical emission end (2) comprises: a ceramic heat sink (210) and a laser chip (220) integrated on the ceramic heat sink (210).
6. The 400G DR4 silicon photonics optical module according to claim 4, wherein The output waveguides (140) are inclinedly distributed, and the end face of the multi-channel fiber array (5) has the same inclination angle as the output waveguides (140).
7. A 400G DR4 silicon photonics optical module according to claim 4, characterized in that, The multi-channel fiber array (5) is a four-channel fiber array.