Investigation of Multiple-Channel Optical Filter Based on Fabry-Perot Structure for Broadband Multichannel Communication Systems

Based on Fabry-Perot structure, a multiple-channel filter is obtained in theory by changing the structure of spacer layers. This paper is concerned with the design of an optical filter, based on thin-film interference, for multichannel optical communication systems with Ta₂O₅ and SiO₂ materials for 1550 nm operation. The variation of these parameters is also studied for various modified filter configurations. The performance of the filter configuration is analyzed and the numerical results of the optimization parameters, such as central wavelength, 3-dB bandwidth, figure of merit and ripple in the passband, are reported. The variation of these parameters is also studied for various modified filter configurations. The angular performance of the filter is investigated in terms of spectral shift of transmittance towards shorter wavelengths. It is concluded that the width of adjacent routeways can be changed by changing the structure of spacer layers.