Method for adjusting direct current optical power in optical module based on silicon optical PIC

Abstract

The invention discloses a method for adjusting direct-current optical power in an optical module based on a silicon optical PIC, and relates to the technical field of optical communication. Respectively entering an ending process, a power balancing process or a power stabilizing process according to different states of two paths of direct-current optical switches driven by a laser in the silicon optical module; if in the power balance process or the power stabilization process, judging that the power of the two paths of direct current light driven by the laser does not meet the requirement; adjusting the optical power of an output optical path of the silicon optical module in a temperature control mode until the optical power of the two paths of direct current light driven by the laser meets the requirements; the method can solve the problem that a traditional silicon optical module is high in structural complexity.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to a method for regulating direct current optical power in an optical module based on silicon photonic integrated circuit (PIC). Background Art

[0002] As an emerging optical communication technology, silicon photonic modules are developing rapidly and providing efficient, low-cost, and low-power solutions for modern communication systems. With the continuous advancement of technology, silicon photonic modules have a brighter future in data centers, optical communication networks, 5G, and other high-speed communication applications.

[0003] Although silicon photonic modules have significant advantages in many fields, they still face some challenges. In the design of silicon photonic modules, the CMIS (Common Management Interface Specification) protocol has become a standard, especially in silicon photonic modules for optical communications and data centers. According to the requirements of the CMIS protocol, silicon photonic modules need to maintain a stable modulated optical power output within the specified operating temperature range. Therefore, many existing technologies have implemented automatic power adjustment mechanisms based on the CMIS protocol to meet the standard requirements. However, since the light source power adjustment of silicon photonic modules usually needs to rely on external hardware, the cost and complexity are high, resulting in a high production cost for such modules. First of all, the power adjustment of the light source of the silicon photonic module, especially the laser, is a key issue in its design. Existing technologies usually rely on certain modulator architectures, such as 1-drive-2, 1-drive-4, 1-drive-8 and other modes to meet the needs of multi-channel parallel transmission. These modules usually need to implement precise light source power adjustment to ensure the stability and reliability of each channel within the operating temperature range.

[0004] The power regulation method of traditional laser sources relies on an external feedback control system, which detects the intensity of the output optical signal in real time and adjusts the current or voltage of the laser as needed to achieve power stability. Common feedback control methods include temperature control, automatic gain control (AGC), power monitoring and compensation mechanisms. These technologies are often used to ensure the stability of silicon photonic modules under different operating temperatures and load conditions. Some solutions even use integrated circuit (IC) technology to achieve real-time adjustment of the light source by integrating intelligent control chips in silicon photonic modules. This solution can provide precise power control and reduce dependence on external hardware, thereby reducing costs;

[0005] However, these feedback control methods can usually only be applied to simple module designs where one laser drives one signal. In the special structure of silicon photonic modules, in order to save power and cost, one laser drives several signals. As a result, these simple feedback mechanisms are difficult to meet the needs with simple designs. Either more components are added or more complex circuits are used to achieve control, which makes it difficult to achieve low-cost and efficient control. For example, IC technology is more complex and usually requires customized design, so its popularity in mass production is limited.

[0006] The power regulation method of the traditional laser source is to use the silicon photonic module firmware code to achieve this control. The general method is that in the existing technology, in order to ensure that the optical power of the DC light output by each laser of the silicon photonic module is basically stable at a constant value at different temperatures before entering the modulator, a TS setting value, that is, the split ratio setting value of the splitter, will be adjusted for each DC light of each silicon photonic module at different temperature points during the production of the silicon photonic module, and finally a lookup table (LUT) is formed. Then, in normal operation, the silicon photonic module finds the appropriate TS setting value in the LUT according to the real-time collected temperature and sets it in. The commonly used LUT format is roughly shown in Table 1:

[0007] Table 1: 1-drive-2 silicon photonic module TS LUT

[0008]

[0009]

[0010] Within the normal operating temperature range required for the module, test enough temperature points corresponding to their respective TS setting values. The more TS used inside the silicon photonic module, the more corresponding TS LUTs there are.

[0011] However, in silicon photonic modules, a laser generally drives multiple optical signals. Therefore, in CMIS control, after turning off some channel outputs, on the one hand, in order to control the actual output modulated optical power of the closed channel below the specified threshold, on the other hand, closing the channel will cause the module temperature to change, thereby affecting the TS output, and further causing the output modulated optical power of the normally working channel to change. Therefore, it is necessary to add some TS LUTs for the closed channels to meet the various working conditions of the silicon photonic module in actual applications. Correspondingly, the storage space of the silicon photonic module is higher, and more TS LUTs will also affect the processing speed of the silicon photonic module for the optical power modulation process. Summary of the invention

[0012] The object of the present invention is to provide a method for regulating direct current optical power in an optical module based on silicon photonic PIC, which can reduce the complexity of the silicon photonic module structure and solve the problem of low optical power regulation efficiency of direct current light in the silicon photonic module.

[0013] The present invention is achieved through the following technical solutions:

[0014] A method for regulating direct current optical power in an optical module based on silicon photonic PIC, specifically comprising:

[0015] Collect the current temperature T of the silicon photonic module;

[0016] According to the different states of the two DC optical switches driven by the laser in the silicon photonic module, the end process, power balance process or power stabilization process are entered respectively;

[0017] If in the power balancing process or the power stabilization process, it is determined that the power of the two DC lights driven by the laser does not meet the requirements;

[0018] The temperature control method is used to adjust the optical power of the output optical path of the silicon photonic module until the optical power of the two direct current lights driven by the laser meets the requirements and then the adjustment is ended.

[0019] Furthermore, the two-way DC optical switch state driven by the laser in the silicon optical module includes a state where both DC optical paths are closed, a state where both DC optical paths are open, and a state where only one DC optical path is open;

[0020] The state where both DC optical paths are closed corresponds to the end of the process;

[0021] The state where both DC optical paths are turned on corresponds to the power balancing process;

[0022] The state where only one DC optical path is open corresponds to the power stabilization process.

[0023] Furthermore, the specific steps of the power balancing process include:

[0024] According to the temperature T and the temperature lookup table, the target value is calculated using the linear interpolation method;

[0025] Obtain the monitoring values ​​of the laser output optical powers of the two direct current lights in the silicon photonic module respectively, and calculate the actual values;

[0026] Judge the inequality |T Ratio -C Ratio |>T Ratio *α, whether it is established, and T Ratio is the target value, C Ratio is the actual value, α is the power deviation range;

[0027] If so, adjust the optical power of the output optical path of the silicon photonic module;

[0028] If not, enter the end process.

[0029] Furthermore, the method of calculating the target value using linear interpolation includes:

[0030]

[0031] Among them, T1 and T2 are the two temperature points closest to T in the temperature lookup table, and T1<T<T2, TargetRatio T1 is the value corresponding to the temperature point T1 in the temperature lookup table; TargetRatio T2 It is the value corresponding to the temperature point T2 in the temperature lookup table.

[0032] Furthermore, the TargetRatio T1 and TargetRatio T2 The calculation formulas are:

[0033]

[0034] Among them PD T11 At the temperature point T1, the optical power value of the first DC optical path driven by the laser, PD T12 At the temperature point T1, the optical power value of the second DC optical path driven by the laser; PD T21 At the temperature point T2, the optical power value of the first DC optical path driven by the laser, PD T22 The optical power value of the second DC optical path driven by the laser at temperature point T2.

[0035] Furthermore, the actual value C Ratio The calculation formula is as follows:

[0036]

[0037] PD1 is the optical power value of the first DC optical path driven by the laser, and PD2 is the optical power value of the second DC optical path driven by the laser.

[0038] Furthermore, the optical power of the output optical path of the silicon photonic module is adjusted, and the specific steps are as follows:

[0039] If T Ratio >C Ratio , then gradually increase the split ratio of the splitter in the silicon photonic module;

[0040] If T Ratio <C Ratio , then gradually reduce the splitting ratio of the splitter in the high silicon optical module.

[0041] Furthermore, the specific steps of the power stabilization process include:

[0042] Record the target optical power value T of the other DC optical path before any DC optical path is closed. PDx ;

[0043] After any DC optical path is closed, the actual optical power value C of the other DC optical path is collected. PDx ;

[0044] Judge the inequality |T PDx -C PDx |>T PDx *α, whether it is established, α is the power deviation range;

[0045] If so, adjust the optical power of the output optical path of the silicon photonic module;

[0046] If not, enter the end process.

[0047] Furthermore, the optical power of the output optical path of the silicon photonic module is adjusted by specifically adjusting C PDx Raise or lower to threshold.

[0048] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0049] The present invention discloses a method for regulating direct current optical power in an optical module based on silicon photonic PIC. The method can effectively improve the optical power regulation efficiency of the silicon photonic module by classifying the working status of the silicon photonic module and then adopting different regulation methods according to different working statuses. The temperature control regulation method involves a small number of control elements, thereby not increasing the structural complexity of the silicon photonic module too much.

[0050] By continuously monitoring the temperature changes of silicon photonic modules over the full temperature range and adjusting the DC optical power of silicon photonic modules in real time, the stable operation of silicon photonic modules under various environmental conditions can be effectively guaranteed. This ensures the stability and high performance of silicon photonic modules in long-term use, especially in application scenarios with large temperature changes, to avoid power fluctuations caused by environmental factors.

[0051] This method can ensure that the modulated output power of the silicon photonic module meets the requirements of the relevant communication protocols, ensure that the silicon photonic module needs to maintain a stable modulated optical power output within the specified operating temperature range, avoid communication failures or quality problems caused by unstable power or power that does not meet the requirements, and ensure that the system can work stably under different temperature conditions.

[0052] By setting the allowable power deviation range, frequent adjustment of TS value can be avoided. This approach effectively reduces system noise and adjustment errors, improves system processing efficiency and stability, and reduces unnecessary power consumption and heat generation.

[0053] By feeding back DC optical power and temperature data in real time, the present invention can automatically adjust TS parameters according to actual conditions, realizing intelligent control, which not only improves performance but also simplifies system maintenance and management.

[0054] This method also optimizes the DC optical power output regulation of the silicon photonic module, allowing the silicon photonic module to maintain a high power stability at different operating temperatures, thereby improving the performance of the entire optical communication system and ensuring that it can meet higher transmission requirements in high-density, high-speed networks. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A method flow chart of the present invention;

[0056] Figure 2 Another method flow chart of the present invention;

[0057] Figure 3 It is a linear interpolation schematic diagram of the present invention;

[0058] Figure 4 It is a schematic diagram of the structure of the silicon photonic module of the present invention. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0060] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0062] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] Example 1

[0065] As attached Figure 1 and Figure 2 A method for regulating direct current optical power in an optical module based on silicon photonic PIC is shown, specifically comprising:

[0066] Collect the current temperature T of the silicon photonic module;

[0067] According to the different states of the two DC optical switches driven by the laser in the silicon photonic module, the end process, power balance process or power stabilization process are entered respectively;

[0068] The states of the two-way direct current optical switches driven by the laser in the silicon optical module include a state where both direct current optical paths are closed, a state where both direct current optical paths are opened, and a state where only one direct current optical path is opened;

[0069] The state where both DC optical paths are closed corresponds to the end of the process, that is, if the two DC optical paths are currently in the closed state according to the CMIS protocol, then there is no need to adjust the optical path components behind, because in this case the light output of the laser can be directly turned off, and finally the DC light of the two optical paths of the silicon photonic module and the subsequent modulated light output power will be very low, which will definitely meet the protocol specifications;

[0070] The state where both DC optical paths are turned on corresponds to the power balancing process;

[0071] The state in which only one DC optical path is open corresponds to the power stabilization process; that is, if only one of the two optical paths is currently in working state according to the CMIS protocol, because one optical path is closed, it is necessary to ensure that the modulated light of the closed optical path after passing through the modulator is small enough to meet the size limit of the protocol specification. Therefore, many silicon photonic solutions will choose to actively reduce the output light (DC light) of the laser in this case. However, since one laser drives two optical paths, its output light becomes smaller, which will also reduce the DC light power of the normally working optical path. On the other hand, closing one optical path will cause the module temperature to change, which in turn affects the output light power of the laser. Combined with these situations, it is necessary to significantly adjust TS so that more DC light can be allocated to the normally working optical path so that its final modulated light power remains basically unchanged.

[0072] If in the power balancing process or the power stabilization process, it is determined that the power of the two DC lights driven by the laser does not meet the requirements;

[0073] The temperature control method is used to adjust the optical power of the output optical path of the silicon photonic module until the optical power of the two direct current lights driven by the laser meets the requirements and then the adjustment is ended.

[0074] Example 2

[0075] The specific steps of the power balancing process include:

[0076] According to the temperature T and the temperature lookup table, the target value is calculated using the linear interpolation method;

[0077] The temperature lookup table is used during the module production process to find the appropriate PD at only a few specific temperature points (such as 4 temperature points in this example). n and PD n+1 The ratio of PD n and PD n+1 are the optical power values ​​of the two DC lights at a certain temperature point; when the ratio of the two values ​​of the actual optical path is equal to this ratio, the DC light before entering the modulator meets the requirements at the current temperature, and the specific linear interpolation method is as follows Figure 3 As shown, temperature T is used as the x-axis variable, and the corresponding T is calculated using a linear function. Ratio , for example, the current temperature T is Figure 3 If the temperature is between T1 and T2, the following formula is used for calculation:

[0078]

[0079] Among them, T1 and T2 are the two temperature points closest to T in the temperature lookup table, and T1<T<T2, TargetRatio T1is the value corresponding to the temperature point T1 in the temperature lookup table; TargetRatio T2 It is the value corresponding to the temperature point T2 in the temperature lookup table.

[0080] In addition, the TargetRatio T1 and TargetRatio T2 The calculation formulas are:

[0081]

[0082]

[0083] Among them PD T11 At the temperature point T1, the optical power value of the first DC optical path driven by the laser, PD T12 At the temperature point T1, the optical power value of the second DC optical path driven by the laser; PD T21 At the temperature point T2, the optical power value of the first DC optical path driven by the laser, PD T22 The optical power value of the second DC optical path driven by the laser at the temperature point T2;

[0084] It should be noted that the temperature sensor for collecting silicon photonic modules is generally set on the PCB control board where the silicon photonic module is located. Figure 3 PCB_T in the figure is the temperature of the silicon photonic module.

[0085] Obtain the monitoring values ​​of the laser output optical powers of the two direct current lights in the silicon photonic module respectively, and calculate the actual values;

[0086] In particular, the actual value C Ratio The calculation formula is as follows:

[0087]

[0088] PD1 is the optical power value of the first DC optical path driven by the laser, and PD2 is the optical power value of the second DC optical path driven by the laser.

[0089] Judge the inequality |T Ratio -C Ratio |>T Ratio *α, whether it is established, and T Ratio is the target value, C Ratio is the actual value, α is the power deviation range, such as 10%;

[0090] If so, adjust the optical power of the output optical path of the silicon photonic module;

[0091] If not, the process will be ended, that is, the current adjustment process will be exited to avoid frequent adjustments, which will lead to excessive noise in the optical path and affect the quality of the optical path signal.

[0092] In addition, the optical power of the output optical path of the silicon photonic module is adjusted in the following specific steps:

[0093] If T Ratio >C Ratio , then gradually increase the split ratio of the splitter in the silicon photonic module;

[0094] If T Ratio <C Ratio , then gradually reduce the split ratio of the splitter in the high silicon optical module;

[0095] It should be noted that the step size of increasing and decreasing the branching ratio cannot be too large, otherwise it will cause unnecessary interference to the optical path.

[0096] Example 3

[0097] The specific steps of the power stabilization process include:

[0098] Record the target optical power value T of the other DC optical path before any DC optical path is closed. PDx , so that it can keep the power unchanged in the future;

[0099] After any DC optical path is closed, the actual optical power value C of the other DC optical path is collected. PDx ;

[0100] Judge the inequality |T PDx -C PDx |>T PDx *α, whether it is established, α is the power deviation range, such as 10%;

[0101] If yes, then adjust the optical power of the output optical path of the silicon photonic module. The adjustment process is to increase or decrease according to the actual situation. Because the closed channels are different, the directions of increase and decrease are also different. At the same time, the steps of increase and decrease cannot be too large, otherwise it will cause unnecessary interference to the optical path.

[0102] If not, the process will be ended, that is, the current adjustment process will be directly exited to avoid frequent adjustments, which will lead to excessive noise in the optical path and affect the quality of the optical path signal.

[0103] In addition, the optical power of the output optical path of the silicon photonic module is adjusted by specifically adjusting C PDx Raise or lower to threshold.

[0104] Combined with Figure 4The processes of the above-mentioned embodiments 1-3 need to be run throughout the life cycle of the optical module to ensure that the performance of the optical module is always in the best state.

[0105] In addition, the core of the present invention is to achieve stable output modulation power of silicon photonic modules under different temperature conditions through real-time temperature monitoring and feedback adjustment of DC optical power ratio. This technical solution ensures that when the ambient temperature changes greatly, the silicon photonic module can automatically adjust the power to adapt to different working conditions and ensure long-term stability;

[0106] In addition, the TS adjustment method proposed in the present invention combines real-time optical power and temperature data, uses a temperature lookup table (LUT) and a linear interpolation algorithm to calculate the target power ratio, and accurately adjusts the TS parameters by comparing it with the real-time power ratio. This adjustment mechanism can efficiently and accurately adjust the power output of the silicon photonic module to ensure stable performance in various working environments;

[0107] By designing different optical path states (such as both optical paths working, only one optical path working, etc.), the present invention can adopt different adjustment strategies according to specific working states, further improving the flexibility and adaptability of the system.

[0108] Example 4

[0109] An electronic device comprises: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate via the bus, and the machine-readable instructions are executed by the processor to perform steps of a method for regulating direct current optical power in a silicon photonic module.

[0110] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of a method for regulating direct current optical power in a silicon photonic module are executed.

[0111] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for regulating DC optical power in an optical module based on silicon photonic PIC, specifically comprising: Collect the current temperature T of the silicon photonic module; According to the different states of the two DC optical switches driven by the laser in the silicon photonic module, the end process, power balance process or power stabilization process are entered respectively; If in the power balancing process or the power stabilization process, it is determined that the power of the two DC lights driven by the laser does not meet the requirements; The temperature control method is used to adjust the optical power of the output optical path of the silicon photonic module until the optical power of the two direct current lights driven by the laser meets the requirements and then the adjustment is ended.

2. The method for adjusting direct current optical power in an optical module based on silicon photonic PIC according to claim 1, characterized in that: The two-way DC optical switch state driven by the laser in the silicon optical module includes a state where both DC optical paths are closed, a state where both DC optical paths are opened, and a state where only one DC optical path is opened; The state where both DC optical paths are closed corresponds to the end of the process; The state where both DC optical paths are turned on corresponds to the power balancing process; The state where only one DC optical path is open corresponds to the power stabilization process.

3. The method for adjusting direct current optical power in an optical module based on silicon photonic PIC according to claim 2, characterized in that: The specific steps of the power balancing process include: According to the temperature T and the temperature lookup table, the target value is calculated using the linear interpolation method; Obtain the monitoring values ​​of the laser output optical powers of the two direct current lights in the silicon photonic module respectively, and calculate the actual values; Judge the inequality |T Ratio -C Ratio |>T Ratio *α, whether it is established, and T Ratio is the target value, C Ratio is the actual value, α is the power deviation range; If so, adjust the optical power of the output optical path of the silicon photonic module; If not, the process ends.

4. The method for adjusting direct current optical power in an optical module based on silicon photonic PIC according to claim 3, characterized in that: The method of calculating the target value by linear interpolation method comprises: Among them, T1 and T2 are the two temperature points closest to T in the temperature lookup table, and T1 <T<T2,TargetRatio T1 is the value corresponding to the temperature point T1 in the temperature lookup table; TargetRatio T2 It is the value corresponding to the temperature point T2 in the temperature lookup table.

5. The method for regulating direct current optical power in an optical module based on silicon photonic PIC according to claim 4, characterized in that: The TargetRatio T1 The calculation formula is: Among them, PD T11 At the temperature point T1, the optical power value of the first DC optical path driven by the laser, PD T12 The optical power value of the second DC optical path driven by the laser at temperature point T1.

6. The method for regulating direct current optical power in an optical module based on silicon photonic PIC according to claim 4, characterized in that: The TargetRatio T2 The calculation formula is: Among them, PD T21 At the temperature point T2, the optical power value of the first DC optical path driven by the laser, PD T22 The optical power value of the second DC optical path driven by the laser at temperature point T2.

7. The method for regulating direct current optical power in an optical module based on silicon photonic PIC according to claim 3, characterized in that: The actual value C Ratio The calculation formula is as follows: PD1 is the optical power value of the first DC optical path driven by the laser, and PD2 is the optical power value of the second DC optical path driven by the laser.

8. The method for regulating direct current optical power in an optical module based on silicon photonic PIC according to claim 3, characterized in that: The specific steps of adjusting the optical power of the output optical path of the silicon photonic module are as follows: If T Ratio >C Ratio , then gradually increase the split ratio of the splitter in the silicon photonic module; If T Ratio <C Ratio , then gradually reduce the splitting ratio of the splitter in the high silicon optical module.

9. The method for regulating direct current optical power in an optical module based on silicon photonic PIC according to claim 2, characterized in that: The specific steps of the power stabilization process include: Record the target optical power value T of the other DC optical path before any DC optical path is closed. PDx ; After any DC optical path is closed, the actual optical power value C of the other DC optical path is collected. PDx ; Judge the inequality |T PDx -C PDx |>T PDx *α, whether it is established, α is the power deviation range; If so, adjust the optical power of the output optical path of the silicon photonic module; If not, the process ends.

10. The method for regulating direct current optical power in an optical module based on silicon photonic PIC according to claim 9, characterized in that: The specific implementation steps of adjusting the optical power of the output optical path of the silicon photonic module are as follows: PDx Raise or lower to threshold.

Images