Simulation of a dual-channel fiber optic filter at 1 550 nm

With the rapid development of optical fiber communication technologies, single-wavelength fiber filters can hardly meet the requirements of multi-wavelength light sources, making it particularly important to study the multi-wavelength filtering characteristics of fiber filters. Spectral filtering is a key technology for selective transmission and processing of optical signals, yet its effect is susceptible to transmission medium properties and external environmental factors. To address this issue, MATLAB software was used to model and simulate a dual-channel fiber filter operating at 1 550 nm, focusing on parameters such as incident angle, exit angle, splitting ratio, and fiber length. Through systematic simulation of its spectral response characteristics, the influence patterns of key parameters on filtering performance were identified. This study provides a theoretical basis for optimizing the design of dual-channel fiber filters, contributing to the enhancement of their application efficiency.