Abstract
A novel wavelength switchable all-fiber comb filter based on a dual-pass Mach-Zehnder (M-Z) interferometer is proposed and demonstrated. The proposed filter consists of a rotatable polarizer and a standard dual-pass M-Z interferometer composed of two 3-dB fiber couplers with a polarization controller (PC) in one arm. When the PC is properly set, the wavelength switchable operation is achieved by adjusting the polarization state of the input light. Theoretical calculation is verified by the experimental results. As applications, the proposed comb filter is incorporated into a fiber ring laser to generate wavelength switchable multiwavelength lasing.
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