Polarization insensitive wavelength division multiplexing method and device based on micro-ring array

Abstract

The invention discloses a polarization insensitive wavelength division multiplexing method and device based on a micro-ring array, and the method comprises the following steps: collecting an input optical signal, and introducing the optical signal into a micro-ring array structure through a waveguide; performing geometric design on each layer of the micro-ring resonator; a phase modulator is introduced into the micro-ring resonator, and the coupling area of the micro-ring and the waveguide is optimized; through arrangement of the micro-rings and dynamic control of the phase modulator, optical signals with specific wavelengths are demultiplexed from the micro-ring array to the output waveguide, and the overall signal transmission performance is calculated. Optical signals in two polarization states of transverse electromagnetic waves and transverse magnetic waves are processed at the same time, the influence of polarization sensitivity on system performance is effectively eliminated, and meanwhile high integration level and high multiplexing efficiency are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of wavelength division multiplexing, and in particular to a method and device for polarization insensitive wavelength division multiplexing based on a micro-ring array. Background Art

[0002] With the rapid development of optical communication and optical computing technologies, wavelength division multiplexing (WDM) has become one of the key technologies to improve the bandwidth of optical fiber transmission and the performance of optical computing systems. WDM significantly improves the capacity and efficiency of the system by transmitting multiple optical signals of different wavelengths in the same optical fiber or chip. This technology is widely used in data centers, long-distance optical fiber communication networks, and high-speed optical computing systems. However, with the continuous growth of demand, the existing WDM based on microring resonators still has many bottlenecks in performance and application flexibility, which need to be solved urgently.

[0003] Traditional microring resonators have many advantages in the multiplexing and demultiplexing of optical signals, such as small size, high integration, and strong wavelength selectivity. These advantages make microring resonators a core component for realizing optical wavelength multiplexing. However, most existing microring resonators use a single-layer microring structure. Although this design can achieve basic wavelength selection functions, it is powerless when faced with higher-density multiplexing and complex optical signal processing. In the process of multi-wavelength signal multiplexing, the number of multiplexing channels of existing microring structures is limited, which makes it difficult to meet the requirements of high-speed optical computing chips and large-bandwidth communication networks for high channel counts and low losses.

[0004] In addition, the polarization sensitivity of microring resonators is also a major issue that affects their performance. The polarization state of optical signals will change during propagation. Especially in practical applications, the polarization state of optical signals will change due to environmental factors (such as temperature, stress, etc.), which will have a significant impact on the working performance of the microring resonator. Existing microring resonators can usually only effectively process optical signals of a certain polarization state, such as transverse electromagnetic waves or transverse magnetic wave modes, but in actual systems, the polarization state of the input optical signal is often variable. When processing optical signals with multiple polarization states, microring resonators will experience problems such as signal attenuation, decreased extinction ratio, and reduced coupling efficiency, resulting in instability in the overall performance of the system. This polarization sensitivity makes microring resonators have great application limitations in complex and changeable optical transmission environments, especially in high-density optical computing and wavelength division multiplexing systems.

[0005] In addition, existing microring resonators also have certain defects in wavelength selection accuracy and noise control. In multiplexing systems with high channel counts and large bandwidths, the resonance conditions and wavelength selectivity of the microrings are very sensitive. Slight temperature changes or material defects may cause wavelength drift, affecting the working performance of the multiplexer. Most of the microring resonators in the prior art use fixed geometric structures and materials, which makes their wavelength selection accuracy unable to meet the strict requirements of large-scale multiplexing systems for wavelength accuracy. At the same time, the noise interference problem of wavelength division multiplexers cannot be ignored. In the case of multi-wavelength multiplexing, crosstalk and noise interference between adjacent channels will seriously affect the transmission quality of the signal, especially in the case of long transmission distances or low signal strength. The impact of noise is more significant, resulting in a sharp drop in signal quality. In order to meet the needs of high bandwidth and high-quality transmission, the design and optimization of existing microring resonators still cannot effectively solve the problem of noise interference.

[0006] In order to overcome the above technical defects, in recent years, the multilayer structure design of microring resonators has gradually become an important direction to solve the problem. By adopting a multilayer design in the microring array, each layer of microring can process optical signals of different wavelengths respectively. This design can greatly increase the number of channels of the microring array, improve the multiplexing efficiency, and reduce the crosstalk problem between wavelengths to a certain extent. However, although the multilayer microring array provides more options in wavelength multiplexing and signal processing, the multilayer microring array in the prior art still has problems such as insufficient polarization insensitivity, inflexible wavelength control, and low coupling efficiency. Especially in practical applications, due to environmental factors and the complexity of optical signals, the multilayer microring array is still susceptible to noise and crosstalk when processing multiple polarization states and multiple wavelength signals, resulting in instability of system performance.

[0007] In addition, in the design of traditional microring arrays, the wavelength selection is usually static and achieved through fixed geometric dimensions and materials. However, with the increasing requirements for wavelength multiplexing in optical communications and optical computing, traditional static designs have become difficult to adapt to the needs of high speed, flexibility and dynamic adjustment. Therefore, introducing a phase modulator to dynamically adjust the resonant wavelength of a microring resonator has become a potential direction to solve this problem. Summary of the invention

[0008] One purpose of the present invention is to propose a method of polarization-insensitive wavelength division multiplexing based on a microring array. The present invention solves the polarization sensitivity problem in the prior art by introducing a multi-layer microring array and a phase modulator, thereby improving the wavelength selection accuracy and multiplexing efficiency. The method can achieve efficient multiplexing and demultiplexing of optical signals in multiple polarization states by dynamically adjusting the resonant wavelength of the microring resonator and combining it with a polarization-insensitive design. At the same time, the technology of dynamically adjusting the wavelength using a phase modulator enables the system to maintain good performance and stability in the face of environmental changes and multiple wavelength signals. In addition, the design of the coupling area between the waveguide and the microring array is optimized, reducing crosstalk and noise interference between wavelengths, and further improving the signal quality and multiplexing efficiency of the system.

[0009] A method for polarization-insensitive wavelength division multiplexing based on a microring array according to an embodiment of the present invention comprises the following steps:

[0010] S1, collecting input optical signals and introducing the optical signals into the microring array structure through waveguides;

[0011] S2, geometric design of each layer of the microring resonator;

[0012] S3, introduce a phase modulator into the microring resonator to optimize the coupling area between the microring and the waveguide;

[0013] S4. Through the arrangement of microrings and dynamic control of the phase modulator, the optical signal of a specific wavelength is demultiplexed from the microring array to the output waveguide, and the overall signal transmission performance is calculated.

[0014] Optionally, the optical signal includes two polarization states: transverse electromagnetic wave and transverse magnetic wave.

[0015] Optionally, the micro-ring array structure tightly integrates multiple micro-ring arrays on the same chip by means of multi-layer stacking.

[0016] Optionally, the micro-ring array structure multiplexes and demultiplexes multiple wavelength signals through a multi-layer structure, the micro-ring of each channel processes one wavelength signal, and the noise of the sideband is controlled by the number of layers of the micro-ring.

[0017] Optionally, the microrings in the same layer of the microring array structure work independently of each other, and the resonant wavelength of each layer of microrings is controlled by adjusting the geometric size and material of the microrings:

[0018]

[0019] Among them, λ m is the resonant wavelength, n eff is the effective refractive index of the microring waveguide, L is the circumference of the microring, and m is the order of the resonant mode, which is an integer.

[0020] Optionally, the geometric design step includes: controlling the resonance condition by adjusting the perimeter of the microring resonator; designing a multi-layer microring array structure to expand the free spectrum range:

[0021]

[0022] Wherein, FSR is the free spectral range.

[0023] Optionally, the microring array structure adopts different microring perimeters and interlayer coupling methods, and the steps of optimizing the coupling region between the microring and the waveguide specifically include: ensuring that the difference in propagation constants in the coupling region is minimized; designing the microring coupling length L c And the coupling coefficient κ:

[0024]

[0025] Where T is the coupling efficiency, β TE is the propagation constant of the transverse electromagnetic wave mode, β TM The propagation constant of the transverse magnetic wave mode, L c is the length of the coupling region, κ is the coupling coefficient of the coupling region, and exp is an exponential function whose base is the natural constant e.

[0026] Optionally, the change of the effective refractive index is dynamically controlled by a phase modulator in the micro-ring array structure:

[0027] n eff,new =n eff +k*V;

[0028] Among them, n eff,new is the change of the effective refractive index of the microring waveguide, k is the refractive index change coefficient related to the material properties, V is the voltage applied to the phase modulator, and the resonant wavelength becomes:

[0029]

[0030] in, is the resonant wavelength, L is the circumference of the microring, and m is the order of the resonant mode, which is an integer.

[0031] Optionally, the overall signal transmission performance is:

[0032]

[0033] Among them, T total is the overall transmission efficiency, T i is the transmission efficiency of the i-th microring layer, and N is the number of layers of the microring array.

[0034] A polarization-insensitive wavelength division multiplexing device based on a micro-ring array according to an embodiment of the present invention includes:

[0035] Waveguide: used to guide the input optical signal to the working area of ​​the microring array, and output the multiplexed or demultiplexed signal to the specified location. It is responsible for introducing the signal of the external light source into the microring array at the input end, and transmitting the specific wavelength signal processed by the microring resonator to the subsequent processing module at the output end;

[0036] Microring resonator: used to selectively resonate optical signals of specific wavelengths and couple these wavelength signals from the input waveguide to the output waveguide. Combined with a phase modulator, the resonant wavelength can be dynamically adjusted.

[0037] Phase modulator: used to change the effective refractive index of the microring resonator, dynamically adjust the resonant wavelength, and process signals of different wavelengths.

[0038] The beneficial effects of the present invention are:

[0039] First, the design of multi-layer micro-ring array structure greatly increases the number of multiplexed channels, allowing the system to process more wavelength signals at the same time, thereby improving the multiplexing efficiency and system bandwidth. This multi-layer design not only meets the needs of high-density integration, but also effectively improves the wavelength selection accuracy and avoids the problems of limited channel number and signal loss in traditional single-layer micro-ring structure.

[0040] Secondly, the phase modulator introduced in the present invention solves the static limitations of traditional microring resonators when processing wavelength selection. By dynamically adjusting the resonant wavelength of the microring resonator, the system can adapt to signal inputs of different wavelengths in real time, greatly enhancing the flexibility and adaptability of the system. Especially when facing optical signals of multiple polarization states, the introduction of the phase modulator enables the system to adjust the phase according to the changes in the optical signal, maintain the resonant condition of the microring resonator, avoid signal attenuation and performance fluctuations caused by changes in polarization states, and thus improve the system's adaptability to complex optical transmission environments.

[0041] In addition, the present invention effectively solves the polarization sensitivity problem of microring resonators in the prior art. By optimizing the coupling design between the microring and the waveguide, the system can simultaneously process optical signals in both transverse electromagnetic and transverse magnetic polarization states. This polarization-insensitive design makes the transmission quality of optical signals no longer affected by changes in polarization states, thereby improving the stability of the system. Especially in optical communications and optical computing, the polarization states of signals are often variable. The use of a polarization-insensitive design can avoid the performance degradation caused by changes in polarization states in traditional technologies, significantly enhancing the reliability of the system.

[0042] Through the above technical innovations, the present invention has also achieved significant improvements in noise control and signal quality. Due to the combination of the multi-layer structure and dynamic wavelength control in the micro-ring array design, the system can effectively reduce crosstalk and noise interference between wavelengths in an environment with a high number of channels and a large bandwidth, maintaining a high signal quality and extinction ratio. The introduction of the phase modulator also makes the wavelength selectivity more precise, further improving the signal-to-noise ratio of the system and ensuring the stable transmission of multi-wavelength signals in complex environments.

[0043] In general, the innovative design of the multi-layer micro-ring array and phase modulator adopted by the present invention not only overcomes the technical bottlenecks of polarization sensitivity, low wavelength selection accuracy, and limited number of channels of traditional micro-ring resonators, but also improves the efficiency of optical signal multiplexing and demultiplexing, and enhances the system's ability to adapt to dynamic environmental changes. The application of this technology not only promotes the improvement of the bandwidth and signal processing capabilities of optical communication systems, but also provides a reliable solution for the efficient integration and performance optimization of optical computing chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0045] Figure 1 A flow chart of a method for polarization-insensitive wavelength division multiplexing based on a micro-ring array proposed by the present invention;

[0046] Figure 2 A diagram of a device for implementing wavelength division multiplexing using a four-channel four-layer silicon microring array provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0047] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0048] refer to Figure 1 , a method for polarization-insensitive wavelength division multiplexing based on a microring array, comprising the following steps:

[0049] S1, collecting input optical signals and introducing the optical signals into the microring array structure through waveguides;

[0050] S2, geometric design of each layer of the microring resonator;

[0051] S3, introduce a phase modulator into the microring resonator to optimize the coupling area between the microring and the waveguide;

[0052] S4. Through the arrangement of microrings and dynamic control of the phase modulator, the optical signal of a specific wavelength is demultiplexed from the microring array to the output waveguide, and the overall signal transmission performance is calculated.

[0053] In this embodiment, the optical signal includes two polarization states: transverse electromagnetic wave and transverse magnetic wave.

[0054] In this embodiment, the micro-ring array structure tightly integrates multiple micro-ring arrays on the same chip by means of multi-layer stacking.

[0055] In this implementation, the micro-ring array structure multiplexes and demultiplexes multiple wavelength signals through a multi-layer structure, and the micro-ring of each channel processes one wavelength signal, and the noise of the sideband is controlled by the number of layers of the micro-ring.

[0056] In this embodiment, the microrings in the same layer of the microring array structure work independently of each other, and the resonant wavelength of each layer of microrings is controlled by adjusting the geometric size and material of the microrings:

[0057]

[0058] Among them, λ m is the resonant wavelength, n eff is the effective refractive index of the microring waveguide, L is the circumference of the microring, and m is the order of the resonant mode, which is an integer.

[0059] In this embodiment, the geometric design steps include: controlling the resonance condition by adjusting the perimeter of the microring resonator; designing a multi-layer microring array structure to expand the free spectrum range:

[0060]

[0061] Wherein, FSR is the free spectral range.

[0062] In this embodiment, the microring array structure adopts different microring perimeters and interlayer coupling methods. The steps of optimizing the coupling area between the microring and the waveguide specifically include: ensuring that the difference in the propagation constant of the coupling area is minimized; designing the microring coupling length L c And the coupling coefficient κ:

[0063]

[0064] Where T is the coupling efficiency, β TE is the propagation constant of the transverse electromagnetic wave mode, β TM The propagation constant of the transverse magnetic wave mode, L c is the length of the coupling region, κ is the coupling coefficient of the coupling region, and exp is an exponential function whose base is the natural constant e.

[0065] In this embodiment, the micro-ring array structure dynamically controls the change of the effective refractive index through a phase modulator:

[0066] n eff,new =n eff +k*V;

[0067] Among them, n eff,new is the change of the effective refractive index of the microring waveguide, k is the refractive index change coefficient related to the material properties, V is the voltage applied to the phase modulator, and the resonant wavelength becomes:

[0068]

[0069] in, is the resonant wavelength, L is the circumference of the microring, and m is the order of the resonant mode, which is an integer.

[0070] In this implementation, the overall signal transmission performance is:

[0071]

[0072] Among them, T total is the overall transmission efficiency, T i is the transmission efficiency of the i-th microring layer, and N is the number of layers of the microring array.

[0073] A polarization-insensitive wavelength division multiplexing device based on a micro-ring array, comprising:

[0074] Waveguide: used to guide the input optical signal to the working area of ​​the microring array, and output the multiplexed or demultiplexed signal to the specified location. It is responsible for introducing the signal of the external light source into the microring array at the input end, and transmitting the specific wavelength signal processed by the microring resonator to the subsequent processing module at the output end;

[0075] Microring resonator: used to selectively resonate optical signals of specific wavelengths and couple these wavelength signals from the input waveguide to the output waveguide. Combined with a phase modulator, the resonant wavelength can be dynamically adjusted.

[0076] Phase modulator: used to change the effective refractive index of the microring resonator, dynamically adjust the resonant wavelength, and process signals of different wavelengths.

[0077] Embodiment 1:

[0078] like Figure 2As shown, a specific embodiment of the present invention is a device for wavelength division multiplexing using a four-channel four-layer silicon microring array. The four microrings in each channel are responsible for coupling and transmitting an optical signal of one wavelength, and the device has polarization insensitivity and can simultaneously support the transmission of optical signals in transverse electromagnetic wave and transverse magnetic wave modes, thereby realizing the function of wavelength division multiplexing. The circumferences of microring resonators 1-1, 1-2, 1-3, 1-4, 2-1, 2-2, 2-3, 2-4, 3-1, 3-2, 3-3, 3-4, 4-1, 4-2, 4-3, and 4-4 are 34.17 μm, 41.01 μm, 47.84 μm, 54.67 μm, 34.19 μm, 41.03 μm, 47.87 μm, 54.71 μm, 34.21 μm, 41.05 μm, 47.90 μm, 54.74 μm, 34.23 μm, 41.08 μm, 47.93 μm, and 54.78 μm, respectively.

[0079] Embodiment 2:

[0080] This embodiment is based on a communication technology company that is committed to developing and optimizing high-performance optical communication network equipment. The technical challenge currently faced by the company is how to perform wavelength division multiplexing in a high-speed optical communication network while maintaining polarization insensitivity and minimizing signal distortion and noise during transmission. Due to factors such as signal loss, wavelength interference, and polarization state changes in optical communications, existing wavelength division multiplexing technology is difficult to achieve good transmission performance in practical applications.

[0081] In order to solve this problem, the company decided to adopt a polarization-insensitive wavelength division multiplexing method based on a micro-ring array, and designed and tested a new wavelength division multiplexing system by using its efficient wavelength demultiplexing capability and polarization immunity. Through the multi-layer structure in the micro-ring array and the dynamic control of the phase modulator, this system can not only effectively improve the flexibility of the system, but also significantly optimize the signal transmission quality and reduce sideband noise and signal distortion.

[0082] A series of tests were conducted to verify the effectiveness of the technical solution. The tests were conducted at different wavelengths and under different network load conditions. The wavelength used in test 1 was 1550nm, the wavelength used in test 2 was 1470nm, and the wavelength used in test 3 was 1510nm. The tests mainly evaluated the transmission performance, signal noise, bandwidth utilization, and bit error rate during the transmission process.

[0083] Table 1 Performance comparison between micro-ring array wavelength division multiplexing technology and traditional wavelength division multiplexing technology

[0084]

[0085] First, from the perspective of transmission efficiency, the transmission efficiency of microring array wavelength division multiplexing is significantly better than that of traditional wavelength division multiplexing at all tested wavelengths. Specifically, the transmission efficiency of microring array wavelength division multiplexing is 89.38% on average, while that of traditional wavelength division multiplexing is 79.78%, with a difference of about 9.6%. For example, at a wavelength of 1550nm, the transmission efficiency of microring array wavelength division multiplexing is 92.5%, an increase of 10.2% compared to 82.3% of traditional wavelength division multiplexing. This advantage is mainly due to the optimized design of the microring array structure, especially in the geometric size and material selection of the microring resonator, which ensures more efficient transmission of optical signals in the microring array. This optimization not only improves the signal strength, but also reduces the attenuation caused by light loss.

[0086] Secondly, from the perspective of signal noise, the sideband noise of micro-ring array wavelength division multiplexing is generally lower than that of traditional wavelength division multiplexing. The noise of micro-ring array wavelength division multiplexing at all tested wavelengths is reduced by an average of 9.8dB, with the maximum reduction reaching 10.2dB. At a wavelength of 1550nm, the noise of micro-ring array wavelength division multiplexing is -35.6dB, which is 10.2dB lower than the -25.4dB of traditional wavelength division multiplexing. This improvement is of great significance in the signal transmission process, especially in the high-frequency wavelength range. Micro-ring array technology suppresses unnecessary noise and effectively improves the quality and stability of the signal by precisely controlling the geometric structure and phase modulation of the micro-ring.

[0087] In terms of bandwidth utilization, micro-ring array wavelength division multiplexing also shows obvious advantages. Its bandwidth utilization has increased by an average of 11.0%, which means that micro-ring arrays can better utilize optical fiber bandwidth in wavelength multiplexing and signal transmission. Through multi-layer stacking and precise coupling design, micro-ring arrays effectively expand the available bandwidth and improve the data transmission rate, allowing the same optical fiber to carry more signal channels, thereby improving the overall transmission capacity of the system.

[0088] Finally, the performance in bit error rate is also satisfactory. The bit error rate of micro-ring array wavelength division multiplexing at all tested wavelengths is significantly lower than that of traditional wavelength division multiplexing, with an average improvement of 26%. Taking 1550nm wavelength as an example, the bit error rate of the traditional system is 1.2e -3 , while the microring array system is reduced to 0.9e -3 The improvement is 25%. The reduction in bit error rate shows that micro-ring array technology can better maintain signal integrity and reduce signal distortion during signal transmission, thereby improving system reliability.

[0089] In summary, the micro-ring array wavelength division multiplexing technology has demonstrated its superiority in many aspects. Compared with the traditional wavelength division multiplexing technology, the micro-ring array not only improves the transmission efficiency of optical signals, reduces signal noise, optimizes bandwidth utilization, but also significantly improves the bit error rate of the system. These performance improvements provide strong technical support for the application of micro-ring array technology in high-speed optical communications, data centers and other fields, and prove the feasibility and advantages of this technology in practical applications.

[0090] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for polarization-insensitive wavelength division multiplexing based on a microring array, characterized in that: The steps include: S1, collecting input optical signals and introducing the optical signals into the microring array structure through waveguides; S2, geometric design of each layer of the microring resonator; S3, introduce a phase modulator into the microring resonator to optimize the coupling area between the microring and the waveguide; S4. Through the arrangement of microrings and dynamic control of the phase modulator, the optical signal of a specific wavelength is demultiplexed from the microring array to the output waveguide, and the overall signal transmission performance is calculated.

2. The method for polarization-insensitive wavelength division multiplexing based on microring array according to claim 1, characterized in that: The optical signal includes two polarization states: transverse electromagnetic wave and transverse magnetic wave.

3. The method for polarization-insensitive wavelength division multiplexing based on microring array according to claim 1, characterized in that: The micro-ring array structure tightly integrates multiple micro-ring arrays on the same chip by means of multi-layer stacking.

4. The method for polarization-insensitive wavelength division multiplexing based on microring array according to claim 1, characterized in that: The micro-ring array structure multiplexes and demultiplexes multiple wavelength signals through a multi-layer structure, the micro-ring of each channel processes one wavelength signal, and the noise of the sideband is controlled by the number of layers of the micro-ring.

5. The method for polarization-insensitive wavelength division multiplexing based on microring array according to claim 1, characterized in that: The microrings in the same layer of the microring array structure work independently of each other, and the resonant wavelength of each layer of microrings is controlled by adjusting the geometric size and material of the microrings: Among them, λ m is the resonant wavelength, n eff is the effective refractive index of the microring waveguide, L is the circumference of the microring, and m is the order of the resonant mode, which is an integer.

6. The method for polarization-insensitive wavelength division multiplexing based on microring array according to claim 1, characterized in that: The steps of the geometric design include: controlling the resonance condition by adjusting the perimeter of the microring resonator; designing a multi-layer microring array structure to expand the free spectrum range: Wherein, FSR is the free spectral range.

7. The method for polarization-insensitive wavelength division multiplexing based on microring array according to claim 1, characterized in that: The microring array structure adopts different microring perimeters and interlayer coupling methods. The steps of optimizing the coupling area between the microring and the waveguide specifically include: ensuring that the difference in the propagation constant of the coupling area is minimized; designing the microring coupling length L c And the coupling coefficient κ: Where T is the coupling efficiency, β TE is the propagation constant of the transverse electromagnetic wave mode, β TM The propagation constant of the transverse magnetic wave mode, L c is the length of the coupling region, κ is the coupling coefficient of the coupling region, and exp is an exponential function whose base is the natural constant e.

8. The method for polarization-insensitive wavelength division multiplexing based on microring array according to claim 1, characterized in that: The change of the effective refractive index in the micro-ring array structure is dynamically controlled by a phase modulator: n eff,new =n eff +k*V; Among them, n eff,new is the change of the effective refractive index of the microring waveguide, k is the refractive index change coefficient related to the material properties, V is the voltage applied to the phase modulator, and the resonant wavelength becomes: in, is the resonant wavelength, L is the circumference of the microring, and m is the order of the resonant mode, which is an integer.

9. The method for polarization-insensitive wavelength division multiplexing based on microring array according to claim 1, characterized in that: The overall signal transmission performance is: Among them, T total is the overall transmission efficiency, T i is the transmission efficiency of the i-th microring layer, and N is the number of layers of the microring array.

10. A polarization-insensitive wavelength division multiplexing device based on a microring array, characterized in that: include: Waveguide: used to guide the input optical signal to the working area of ​​the microring array, and output the multiplexed or demultiplexed signal to the specified location. It is responsible for introducing the signal of the external light source into the microring array at the input end, and transmitting the specific wavelength signal processed by the microring resonator to the subsequent processing module at the output end; Microring resonator: used to selectively resonate optical signals of specific wavelengths and couple these wavelength signals from the input waveguide to the output waveguide. Combined with a phase modulator, the resonant wavelength can be dynamically adjusted. Phase modulator: used to change the effective refractive index of the microring resonator, dynamically adjust the resonant wavelength, and process signals of different wavelengths.

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