Theory Study for Optical Comb-filter of Cascaded M-Z Interferometer

摘要

A cascaded M-Z fiber interferometer has been analyzed,which is made of several 3dB couplers in series. Theoretical analysis and numerical simulation indicate that a good comb-like curve will be obtained when the length difference Δ L of interference arms is given a certain value in order. Side-mode suppression ratio (SSR) will increase as adding of the number of interference arms.