FP-ROADM effective isolation simulation verification method considering endoscope defect influence

Abstract

The invention discloses an FP-ROADM effective isolation simulation verification method considering endoscope defect influence. The FP-ROADM effective isolation simulation verification method comprises the following steps of S1, input signal simulation, S2, downloading signal simulation, S3, uploading signal simulation and S4, output signal simulation. According to the invention, three typical defects of parallelism, roughness and sphericity of the FP cavity mirror are incorporated into a simulation verification process of the FP-ROADM, so that the optical response of a device under a non-ideal processing condition can be simulated more truly, and thus the effective isolation and other key performance indexes of the device can be evaluated accurately; the method not only improves the reliability and practicability of a simulation result, but also provides a theoretical basis and data support for the process improvement and performance optimization of the FP-ROADM, and has relatively high engineering application value and innovativeness, so that accurate evaluation of key indexes such as effective isolation is realized, the authenticity and predictive ability of a simulation model are improved, and the method is suitable for popularization and application. And the method is suitable for design and process optimization of a high-performance FP-ROADM device.

Description

Technical Field

[0001] This invention relates to the field of ROADM device simulation experiment technology, and more specifically, to a simulation verification method for the effective isolation of FP-ROADM considering the influence of cavity endoscope defects. Background Technology

[0002] With the development of the Internet and network multimedia services, people have increasingly higher requirements for the transmission rate and capacity of network data. Due to the high information carrying capacity of optical fiber, optical fiber communication will gradually become more widespread in the future. Rapid management of numerous wavelength information at the core node of DWDM system has become the key to realizing dynamic routing in optical transmission network and has great application prospects in optical communication network. As a key device of basic node of optical communication network, ROADM has reconfigurability, scalability and compatibility. Due to the functional characteristics of "non-directional, non-color and non-competitive", ROADM device can provide interconnection at any wavelength port and in any direction, and has a high degree of flexibility in the management of communication wavelength. It can manage the communication network system through remote control, can carry out wavelength-level services to large users, and can flexibly add communication channel capacity. It is the core component of the core node of the next generation of optical network and the future development direction of intelligent optical network.

[0003] Because Fabry-Perot (FP) has excellent filtering and tunability characteristics, designing an array-type FP-ROADM device using FP technology has great practical value. However, current verification methods for this technology cannot incorporate three typical defects—parallelism, roughness, and sphericity—into the simulation verification process of FP-ROADM, resulting in the inability to effectively simulate its key performance indicators and poor reliability of the experimental data. Therefore, there is still significant room for improvement in the verification methods for the integration technology of ROADM devices. Summary of the Invention

[0004] To overcome the aforementioned deficiencies in the prior art, embodiments of the present invention provide a simulation verification method for the effective isolation of FP-ROADM that considers the influence of cavity mirror defects. By incorporating three typical defects of FP cavity mirrors—parallelism, roughness, and sphericity—into the simulation verification process of FP-ROADM, the optical response of the device under non-ideal processing conditions can be simulated more realistically, thereby accurately evaluating its effective isolation and other key performance indicators. This method not only improves the reliability and practicality of simulation results but also provides theoretical basis and data support for the process improvement and performance optimization of FP-ROADM, thus achieving accurate evaluation of key indicators such as effective isolation, enhancing the realism and predictive ability of the simulation model, and is applicable to the design and process optimization of high-performance FP-ROADM devices, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a simulation verification method for the effective isolation of FP-ROADM considering the influence of endoscope defects, comprising the following steps: S1. Input signal simulation: Under the condition of initial power of 1mW, optical signals from 8 channels were input to the FP array type ROADM device, and its input spectrum was obtained; S2, Download Signal Simulation: Signals with a wavelength of 1550.12nm are downloaded through a single port, which under normal circumstances only allows signals with a wavelength of 1550.92nm to pass through, while cutting off other wavelengths; S3, Upload signal simulation: The system uploads a signal with a wavelength of 1550.12nm. This wavelength signal can be uploaded from the same port, and its peak power is 0dBm. S4. Output signal simulation: The output port of the FP array type ROADM device ultimately outputs a signal with a peak transmittance of -1dBm under normal circumstances. Compared with the input spectrum, the peak power is attenuated by 1dBm.

[0006] In a preferred embodiment, in step S1, an optical transmission model incorporating FP cavity mirror defects is further established in the simulation, specifically considering the impact of the following three typical defect types on optical performance: Parallelism deviation of the FP cavity mirror surface will cause resonant mode shift and transmission spectrum asymmetry; The roughness of the FP cavity mirror surface causes light scattering and increased insertion loss; The sphericity error of the FP cavity mirror causes beam distortion and mode mismatch.

[0007] In a preferred embodiment, in step S2, considering the defects in the endoscope, the simulation needs to calculate the impact of the defects on the passband and stopband performance of the filter, specifically including: Mirror parallelism error causes center wavelength shift and asymmetrical broadening of the passband; Roughness causes a decrease in edge mold suppression ratio; Sphericity error causes increased passband ripple and deterioration of isolation.

[0008] In a preferred embodiment, in step S3, the impact of the defect on the uploaded signal is further considered: The roughness of the mirror surface causes additional scattering loss to the transmitted optical signal; Parallelism and sphericity defects cause a decrease in coupling efficiency and mode mismatch, resulting in signal distortion.

[0009] In a preferred embodiment, in step S4, after considering the endoscope defects, the simulation further analyzes the impact of the defects on the output signal: The defect causes additional insertion loss, which can further reduce the output power; Passband shape distortion and reduced stopband rejection capability affect the effective isolation of the device. Increased crosstalk caused by defects leads to aggravated interference between channels, affecting the overall system performance.

[0010] In a preferred embodiment, the FP endoscope defect parameters are used in the input signal simulation to simulate the spectral distortion and additional loss caused by the defects; In download signal simulation, defect parameters are used to evaluate their impact on filter passband shape, stopband rejection capability, and inter-channel crosstalk. In the simulation of the uploaded signal, the defect parameters are used to analyze the coupling efficiency, scattering loss and spectral purity changes of the uploaded signal; In output signal simulation, defect parameters are used to calculate the power attenuation, passband distortion, and isolation reduction of the output signal.

[0011] The technical effects and advantages of this invention are as follows: This invention incorporates three typical defects of FP cavity mirrors—parallelism, roughness, and sphericity—into the simulation verification process of FP-ROADM, enabling a more realistic simulation of the optical response of devices under non-ideal processing conditions. This allows for accurate evaluation of their effective isolation and other key performance indicators. This method not only improves the reliability and practicality of simulation results but also provides theoretical basis and data support for the process improvement and performance optimization of FP-ROADM, demonstrating strong engineering application value and innovation. By analyzing its impact on the optical performance of FP-ROADM devices, the system can accurately evaluate key indicators such as effective isolation, improve the realism and predictive ability of the simulation model, and is applicable to the design and process optimization of high-performance FP-ROADM devices. Detailed Implementation

[0012] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, those skilled in the art who have not made any innovative embodiments are all within the scope of protection of the present invention.

[0013] A simulation verification method for the effective isolation of FP-ROADM considering the influence of endoscope defects includes the following steps: S1. Input signal simulation: Under the condition of initial power of 1mW, optical signals from 8 channels were input to the FP array type ROADM device, and its input spectrum was obtained; S2, Download Signal Simulation: Signals with a wavelength of 1550.12nm are downloaded through a single port, which under normal circumstances only allows signals with a wavelength of 1550.92nm to pass through, while cutting off other wavelengths; S3, Upload signal simulation: The system uploads a signal with a wavelength of 1550.12nm. This wavelength signal can be uploaded from the same port, and its peak power is 0dBm. S4. Output signal simulation: The output port of the FP array type ROADM device ultimately outputs a signal with a peak transmittance of -1dBm under normal circumstances. Compared with the input spectrum, the peak power is attenuated by 1dBm.

[0014] In step S1, an optical transmission model incorporating defects in the FP cavity mirror is further established in the simulation, specifically considering the impact of the following three typical defect types on optical performance: Parallelism deviation of the FP cavity mirror surface will cause resonant mode shift and transmission spectrum asymmetry; The roughness of the FP cavity mirror surface causes light scattering and increased insertion loss; The sphericity error of the FP cavity mirror causes beam distortion and mode mismatch; By introducing the aforementioned defect parameters, the input spectrum not only reflects the response under ideal conditions, but also includes the additional losses and spectral distortions caused by the defects. In step S2, considering the defects in the endoscope, the simulation needs to calculate the impact of the defects on the passband and stopband performance of the filter, specifically including: Mirror parallelism error causes center wavelength shift and asymmetrical broadening of the passband; Roughness causes a decrease in edge mold suppression ratio; Sphericity error causes increased passband ripple and deterioration of isolation; The above analysis allows for an accurate assessment of the actual impact of defects on signal download selectivity and inter-channel crosstalk. In step S3, the impact of defects on the uploaded signal is further considered: The roughness of the mirror surface causes additional scattering loss to the transmitted optical signal; Parallelism and sphericity defects cause a decrease in coupling efficiency and mode mismatch, resulting in signal distortion; The combined effect of defects results in the power and spectral purity of the uploaded signal being lower than ideal, and its impact on the system signal-to-noise ratio needs to be quantified in simulation. In step S4, after considering the endoscope defects, the simulation further analyzes the impact of the defects on the output signal: The defect causes additional insertion loss, which can further reduce the output power; Passband shape distortion and reduced stopband rejection capability affect the effective isolation of the device. Increased crosstalk caused by defects leads to aggravated interference between channels, affecting the overall system performance.

[0015] The FP endoscope defect parameters are used in the input signal simulation to simulate the spectral distortion and additional loss caused by the defects. In download signal simulation, defect parameters are used to evaluate their impact on filter passband shape, stopband rejection capability, and inter-channel crosstalk. In the simulation of the uploaded signal, the defect parameters are used to analyze the coupling efficiency, scattering loss and spectral purity changes of the uploaded signal; In output signal simulation, defect parameters are used to calculate the power attenuation, passband distortion, and isolation reduction of the output signal.

[0016] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: In the embodiments disclosed in this invention, only the structures involved in the embodiments disclosed in this invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. Finally: The above description is only a preferred embodiment of this invention and is not intended to limit this invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A simulation verification method for the effective isolation of FP-ROADM considering the influence of endoscopic defects, characterized in that: Includes the following steps, S1. Input signal simulation: Under the condition of initial power of 1mW, optical signals from 8 channels were input to the FP array type ROADM device, and its input spectrum was obtained; S2, Download Signal Simulation: Signals with a wavelength of 1550.12nm are downloaded through a single port, which under normal circumstances only allows signals with a wavelength of 1550.92nm to pass through, while cutting off other wavelengths; S3, Upload signal simulation: The system uploads a signal with a wavelength of 1550.12nm. This wavelength signal can be uploaded from the same port, and its peak power is 0dBm. S4. Output signal simulation: The output port of the FP array type ROADM device ultimately outputs a signal with a peak transmittance of -1dBm under normal circumstances. Compared with the input spectrum, the peak power is attenuated by 1dBm.

2. The simulation verification method for the effective isolation of FP-ROADM considering the influence of endoscopic defects according to claim 1, characterized in that: In step S1, an optical transmission model incorporating defects in the FP cavity mirror is further established in the simulation, specifically considering the impact of the following three typical defect types on optical performance: parallelism deviation of the FP cavity mirror surface, roughness of the FP cavity mirror surface, and sphericity error of the FP cavity mirror surface.

3. The simulation verification method for the effective isolation of FP-ROADM considering the influence of endoscopic defects according to claim 1, characterized in that: In step S2, considering the defects in the endoscope, the simulation needs to calculate the impact of the defects on the passband and stopband performance of the filter, specifically including: Mirror parallelism error causes center wavelength shift and asymmetrical broadening of the passband; Roughness causes a decrease in edge mold suppression ratio; Sphericity error causes increased passband ripple and deterioration of isolation.

4. The simulation verification method for the effective isolation of FP-ROADM considering the influence of endoscopic defects according to claim 1, characterized in that: In step S3, the impact of defects on the uploaded signal is further considered: The roughness of the mirror surface causes additional scattering loss to the transmitted optical signal; Parallelism and sphericity defects cause a decrease in coupling efficiency and mode mismatch, resulting in signal distortion.

5. The simulation verification method for the effective isolation of FP-ROADM considering the influence of endoscopic defects according to claim 1, characterized in that: In step S4, after considering the endoscope defects, the simulation further analyzes the impact of the defects on the output signal: The defect causes additional insertion loss, which can further reduce the output power; Passband shape distortion and reduced stopband rejection capability affect the effective isolation of the device. Increased crosstalk caused by defects leads to aggravated interference between channels, affecting the overall system performance.

6. The simulation verification method for the effective isolation of FP-ROADM considering the influence of endoscopic defects according to claim 1, characterized in that: The FP endoscope defect parameters are used in the input signal simulation to simulate the spectral distortion and additional loss caused by the defects. In download signal simulation, defect parameters are used to evaluate their impact on filter passband shape, stopband rejection capability, and inter-channel crosstalk. In the simulation of the uplink signal, the defect parameters are used to analyze the coupling efficiency, scattering loss, and spectral purity changes of the uplink signal; in the simulation of the output signal, the defect parameters are used to calculate the power attenuation, passband distortion, and isolation reduction of the output signal.