400G DR4 silicon optical chip and optical module

Abstract

The utility model relates to a 400G DR4 silicon optical chip, which is characterized in that an input waveguide divides less than or equal to 1% of light into an MPD, other light is equally divided into four MZM modulators at equal ratio, the four MZM modulators are respectively coupled with four output waveguides, two auxiliary waveguides are respectively distributed on two sides of the input waveguide in a mode of being symmetrical about the input waveguide, and the auxiliary waveguides are respectively coupled with the four output waveguides. Each auxiliary waveguide is coupled to one MPD, respectively. A 400G DR4 silicon optical module is characterized in that a light emitting end is coupled with an input waveguide after sequentially passing through an aspheric lens and an optical isolator, and the coupling position of the aspheric lens is close to the central position of two optimal positions determined when the aspheric lens is respectively coupled with two auxiliary waveguides. The 400G DR4 silicon optical chip has the beneficial effects that when the 400G DR4 silicon optical chip is applied to an optical module, the aspherical lens can be coupled to find light quickly, a complicated amplifying circuit is not required to be used, and meanwhile, the MPD coupled with the two auxiliary waveguides can also monitor the long-term reliability of the optical module.

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 an 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. Less than or equal to 1% of the light in the input waveguide enters an MPD (detector), and the other light (the remaining light greater than or equal to 99%) enters a first 1×2 equal-ratio coupler. The first 1×2 equal-ratio coupler divides 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 divides the light into two equal parts. Since there are two second 1×2 equal-ratio couplers, the other light will be equally divided 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 aspherical 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. Because the insertion loss of the silicon optical chip is large, to ensure that enough optical power enters the MZM modulator, generally the light in the input waveguide distributed to the monitoring MPD is ≤1%, resulting in a very weak response circuit of the MPD. Especially during the process of coupling and finding light by the aspherical lens, the current of the MPD needs to be amplified for easy 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 an optical module to overcome the above deficiencies in the prior art.

[0004] The technical solution of the utility model to solve the above technical problem is as follows: A 400G DR4 silicon optical chip includes: an input waveguide. Less than or equal to 1% of the light in the input waveguide enters an MPD, and the other light is equally divided into four MZM modulators. The four MZM modulators are respectively coupled with four output waveguides. On both sides of the input waveguide, an auxiliary waveguide is distributed symmetrically with respect to the input waveguide. The distance between the auxiliary waveguide and the input waveguide is 20μm - 40μm, and each auxiliary waveguide is coupled with an MPD.

[0005] The beneficial effects of the present utility model are as follows: On the basis of the original 400G DR4 silicon photonics chip, two additional auxiliary waveguides are added, symmetrically distributed with respect to the input waveguide, and each auxiliary waveguide is coupled to an MPD. When the 400G DR4 silicon photonics chip is applied to a 400G DR4 silicon photonics optical module, the aspherical lens coupling for light finding can be rapid, and there is no need to use a complex amplification circuit. Since there are two auxiliary waveguides, when the aspherical lens undergoes a horizontal displacement or skew, a current will appear in the MPD coupled to the auxiliary waveguide, thereby enabling the monitoring of the long-term reliability of the optical module.

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

[0007] Further, the distance between each auxiliary waveguide and the input waveguide is 30 μm.

[0008] Further, the input waveguide is coupled to the input end of a first 1×2 equal-ratio coupler, the output ends of the first 1×2 equal-ratio coupler are respectively coupled to the input ends of two second 1×2 equal-ratio couplers, and the four output ends of the two second 1×2 equal-ratio couplers are respectively coupled to 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 aspherical lens, an optical isolator, and a 400G DR4 silicon photonics chip. The optical emission end is sequentially coupled to the input waveguide of the 400G DR4 silicon photonics chip through the aspherical lens and the optical isolator. The coupling position of the aspherical lens is near the central position of the two optimal positions determined when the aspherical lens is respectively coupled to the two auxiliary waveguides.

[0010] The further beneficial effects of the above are as follows: Since there are two auxiliary waveguides, the aspherical lens coupling for light finding is rapid, and there is no need to use a complex amplification circuit. In addition, when the aspherical lens undergoes a horizontal displacement or skew, a current will appear in the MPD coupled to the auxiliary waveguide, thereby enabling the monitoring of the long-term reliability of the optical module.

[0011] Further, the output waveguide of the 400G DR4 silicon photonics chip is coupled to a multi-channel fiber array.

[0012] Further, the optical emission end includes: a ceramic heat sink and a laser chip integrated on the ceramic heat sink. Description of the Drawings

[0013] Figure 1 It is a structural diagram of a 400G DR4 silicon photonics optical module in the prior art;

[0014] Figure 2 It is a structural diagram of a 400G DR4 silicon photonics chip in the present utility model;

[0015] Figure 3 is Figure 2 a partially enlarged view;

[0016] Figure 4 is a structural diagram of a 400G DR4 silicon photonics optical module when the aspherical lens in the present utility model is near the central position;

[0017] Figure 5 is a structural diagram of a 400G DR4 silicon photonics optical module when the aspherical lens in the present utility model is in the upper position;

[0018] Figure 6 is a structural diagram of a 400G DR4 silicon photonics optical module when the aspherical lens in the present utility model is in the lower position.

[0019] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0020] 1. 400G DR4 silicon photonics chip, 110. Input waveguide, 120. MZM modulator, 130. MPD, 140. Output waveguide, 150. Auxiliary waveguide, 160. First 1×2 equal ratio coupler, 170. Second 1×2 equal ratio coupler, 2. Optical emission end, 210. Ceramic heat sink, 220. Laser chip, 3. Aspherical lens, 4. Optical isolator, 5. Multi-channel fiber array. Specific embodiments

[0021] The principles and features of the present utility model are described below with reference to the attached 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 , Figure 3 shown, a 400G DR4 silicon photonics chip includes: an input waveguide 110. The input waveguide 110 allows less than or equal to 1% of the light to enter a MPD (detector) 130, and the other light (the remaining greater than or equal to 99% of the light) is equally divided into four MZM modulators 120 in equal ratio, that is, it is still consistent with the prior art. The four MZM modulators 120 are respectively coupled to the four output waveguides 140;

[0024] An auxiliary waveguide 150 is distributed on each side of the input waveguide 110, and the two auxiliary waveguides 150 are distributed symmetrically with respect to the input waveguide 110. Since the silicon optical waveguide (corresponding to the above-mentioned input waveguide 110 and auxiliary waveguide 150) is generally 6 μm to 8 μm, the minimum spacing should reach 20 μm. After exceeding 40 μm, the coupling efficiency of the auxiliary waveguide 150 will decrease rapidly. Therefore, in this embodiment, the spacing between each auxiliary waveguide 150 and the input waveguide 110 is 20 μm to 40 μm. In addition, each auxiliary waveguide 150 is coupled to an MPD 130, that is, there are 3 MPDs in this solution;

[0025] When the 400G DR4 silicon photonics chip 1 is applied to a 400G DR4 silicon photonics optical module and coupled to the optical transmitter 2 and the aspherical lens 3, the determination method of the two optimal positions is described below with the perspective shown in the figure as an example. For the convenience of description, the MPDs 130 coupled by the two auxiliary waveguides 150 are respectively denoted as M1 and M2:

[0026] The aspherical lens 3 uses the spectral confocal function in the height direction to make the optical axis center of the aspherical lens 3 approximately coincide with the optical axis center of the optical transmitter 2, and then horizontally move the aspherical lens 3 and scan the horizontal position and height position of the aspherical lens 3;

[0027] When the aspherical lens 3 is deflected upward relative to the optical transmitter 2, the so-called upward is the direction indicated by the arrow in the figure. In this arrow direction, M1 is above the input waveguide 110, while M2 is below the input waveguide 110. The light will be coupled and converged into the auxiliary waveguide 150 denoted as M1, and the MPD 1 coupled to this auxiliary waveguide 150 will be coupled to the maximum, that is, all the light from this auxiliary waveguide 150 enters the MPD 130 coupled to it, making the auxiliary-coupled MPD circuit at least 100 times larger than that of the input waveguide 110, so that a complex amplification circuit is not required. Record the position X1 of the aspherical lens 3 at this time;

[0028] When the aspherical lens 3 is deflected downward relative to the optical transmitter 2, the so-called upward is the direction indicated by the arrow in the figure. In this arrow direction, M1 is above the input waveguide 110, while M2 is below the input waveguide 110. The light will be coupled and converged into the auxiliary waveguide 150 denoted as M2, and the MPD 1 coupled to this auxiliary waveguide 150 will be coupled to the maximum, that is, all the light from this auxiliary waveguide 150 enters the MPD 130 coupled to it, making the auxiliary-coupled MPD circuit at least 100 times larger than that of the input waveguide 110, so that a complex amplification circuit is not required. Record the position X2 of the aspherical lens 3 at this time;

[0029] The recorded positions X1 and X2 of the aspherical lens 3 are the two optimal positions, and then calculate the central position X according to the positions X1 and X2;

[0030] Just move the aspherical lens 3 to the central position X. At this time, the aspherical lens 3 is close to the optimal coupling position, so the current of the MPD130 coupled by the input waveguide 110 is relatively large. Then, fine-tune the position of the aspherical lens 3 according to the current of the MPD130 to make the current value of the MPD130 the largest. At this time, the position is near the central position, and finally fix the aspherical lens 3;

[0031] On the basis of the original 400G DR4 silicon photonics chip, add two additional auxiliary waveguides 150, which are symmetrically distributed with respect to the input waveguide 110, and each auxiliary waveguide 150 is coupled to an MPD130. When this 400G DR4 silicon photonics chip is applied to a 400G DR4 silicon photonics optical module, the aspherical lens 3 can quickly couple and find light, and there is no need to use a complex amplification circuit. Since there are two auxiliary waveguides 150, when the aspherical lens 3 undergoes a horizontal displacement or skew, the MPD130 coupled to the auxiliary waveguide 150 will have a current, so that the long-term reliability of the optical module can be monitored.

[0032] Embodiment 2

[0033] As Figure 2 、 Figure 3 shown, this embodiment is a further improvement on the basis of Embodiment 1, specifically as follows:

[0034] The preferred distance between each auxiliary waveguide 150 and the input waveguide 110 is 30μm. When the aspherical lens 3 undergoes a horizontal displacement or skew, the auxiliary waveguide 150 can divide the light more sensitively, making it easier for the MPD130 coupled to the auxiliary waveguide 150 to have a current, so that the long-term reliability of the optical module can be monitored better.

[0035] Embodiment 3

[0036] As Figure 2 shown, this embodiment is a further improvement on the basis of Embodiment 1 or 2, specifically as follows:

[0037] The input waveguide 110 is coupled to the input end of a first 1×2 ratio coupler 160, that is, other light in the input waveguide 110 (the remaining light greater than or equal to 99%) is split into the first 1×2 ratio coupler 160. The output ends of the first 1×2 ratio coupler 160 are respectively coupled to the input ends of two second 1×2 ratio couplers 170. The first 1×2 ratio coupler 160 equally divides the light into two paths and couples them into the two second 1×2 ratio couplers 170 respectively. The four output ends of the two second 1×2 ratio couplers 170 are respectively coupled to the input ends of four MZM modulators 120. Each second 1×2 ratio coupler 170 also equally divides the light into two paths. Since there are two second 1×2 ratio couplers 170, other light will be equally divided into four paths and then coupled into the four MZM modulators 120, and then the four MZM modulators 120 are respectively coupled to the four output waveguides 140.

[0038] Embodiment 4

[0039] As Figure 4 shown, a 400G DR4 silicon photonics optical module includes: an optical transmitter 2, an aspherical lens 3, an optical isolator 4, and a 400G DR4 silicon photonics chip 1. The optical transmitter 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, it can be understood that the light beam emitted by the optical transmitter 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 coupling position of the aspherical lens 3 is near the central position of the two optimal positions determined when the aspherical lens 3 is respectively coupled to the two auxiliary waveguides 150;

[0040] Taking the perspective shown in the figure as an example for description, the method for determining the two optimal positions is as follows. For the convenience of description, the MPD130s coupled by the two auxiliary waveguides 150 are respectively denoted as M1 and M2:

[0041] During specific coupling, the aspherical lens 3 uses the spectral confocal function in the height direction to make the optical axis center of the aspherical lens 3 roughly coincide with the optical axis center of the optical transmitter 2, and then horizontally move the aspherical lens 3 and scan the horizontal position and height position of the aspherical lens 3;

[0042] As Figure 5As shown, when the aspherical lens 3 is deflected upward relative to the optical emission end 2, where "upward" refers to the direction indicated by the arrow in the figure. In this arrow direction, M1 is above the input waveguide 110, while M2 is below the input waveguide 110. The light will be coupled and concentrated into the auxiliary waveguide 150 denoted as M1, and the MPD1 coupled to this auxiliary waveguide 150 will be coupled to the maximum, that is, all the light enters the MPD130 coupled to it from this auxiliary waveguide 150, making the MPD circuit of the auxiliary coupling at least 100 times larger than that of the input waveguide 110. Thus, a complex amplification circuit is not required, and record the position X1 of the aspherical lens 3 at this time;

[0043] As Figure 6 shown, when the aspherical lens 3 is deflected downward relative to the optical emission end 2, where "upward" refers to the direction indicated by the arrow in the figure. In this arrow direction, M1 is above the input waveguide 110, while M2 is below the input waveguide 110. The light will be coupled and concentrated into the auxiliary waveguide 150 denoted as M2, and the MPD1 coupled to this auxiliary waveguide 150 will be coupled to the maximum, that is, all the light enters the MPD130 coupled to it from this auxiliary waveguide 150, making the MPD circuit of the auxiliary coupling at least 100 times larger than that of the input waveguide 110. Thus, a complex amplification circuit is not required, and record the position X2 of the aspherical lens 3 at this time;

[0044] The recorded positions X1 and X2 of the aspherical lens 3 are the two optimal positions, and then calculate the central position X according to positions X1 and X2;

[0045] Just move the aspherical lens 3 to the central position X. At this time, the aspherical lens 3 is close to the optimal coupling position, so the current of the MPD130 coupled by the input waveguide 110 is relatively large. Then, fine-tune the position of the aspherical lens 3 according to the current of the MPD130 to make the current value of the MPD130 the largest. At this time, the position is near the central position, and finally fix the aspherical lens 3;

[0046] It can make the aspherical lens 3 quickly couple and find light, and there is no need to use a complex amplification circuit. Since there are two auxiliary waveguides 150, when the aspherical lens 3 has a horizontal displacement or skew, a current will appear in the MPD130 coupled to the auxiliary waveguide 150, thereby enabling the monitoring of the long-term reliability of the optical module.

[0047] Embodiment 5

[0048] As Figure 4 shown, this embodiment is a further improvement on Embodiment 4, specifically as follows:

[0049] The output waveguide 140 of the 400G DR4 silicon photonics chip 1 is coupled to a multi-channel fiber array 5. There are four output waveguides 140, so the number of channels of the multi-channel fiber array 5 can be greater than four.

[0050] In addition, the optical transmitter 2 includes: a ceramic heat sink 210 and a laser chip 220 integrated on the ceramic heat sink 210. The light beam emitted by the laser chip 220 is sequentially coupled into the input waveguide 110 of the 400G DR4 silicon photonics chip 1 after passing through the aspherical lens 3 and the optical isolator 4. The optical axis center of the aforementioned optical transmitter 2 corresponds to the optical axis center of the laser chip 220 in the optical transmitter 2.

[0051] 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, comprising: An input waveguide (110), wherein the input waveguide (110) splits less than or equal to 1% of the light into an MPD (130), and the other light is equally divided into four MZM modulators (120) in equal proportion. The four MZM modulators (120) are respectively coupled to four output waveguides (140). It is characterized in that an auxiliary waveguide (150) is distributed on each side of the input waveguide (110) in a manner symmetric about the input waveguide (110). The distance between the auxiliary waveguide (150) and the input waveguide (110) is 20 μm to 40 μm, and each auxiliary waveguide (150) is coupled to an MPD (130).

2. The 400G DR4 silicon photonics chip according to claim 1, wherein The distance between each auxiliary waveguide (150) and the input waveguide (110) is 30 μm.

3. The 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 equal-ratio coupler (160). The output ends of the first 1×2 equal-ratio coupler (160) are respectively coupled to the input ends of two second 1×2 equal-ratio couplers (170). The four output ends of the two second 1×2 equal-ratio couplers (170) are respectively coupled to the input ends of the four MZM modulators (120).

4. A 400G DR4 silicon photonics optical module, characterized in that, Comprising: An optical emission end (2), an aspheric lens (3), an optical isolator (4), 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) through the aspheric lens (3) and the optical isolator (4). The coupling position of the aspheric lens (3) is near the central position of the two optimal positions determined when the aspheric lens (3) is respectively coupled to the two auxiliary waveguides (150).

5. The 400G DR4 silicon photonics optical module according to claim 4, wherein The output waveguide (140) of the 400G DR4 silicon photonics chip (1) is coupled to a multi-channel fiber array (5).

6. The 400G DR4 silicon optical transceiver module according to claim 4, wherein, The optical emission end (2) includes: a ceramic heat sink (210) and a laser chip (220) integrated on the ceramic heat sink (210).

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