Multiwavelength pulse generation using a SESAM-based mode-locked fiber laser together with Fabry-Perot filter

A simple and compact configuration of multiwavelength pulse generator is proposed and experimentally demonstrated, using a SESAM-based passively mode-locked fiber laser together with fiber Fabry-Perot filter. By optimizing the dispersion of fiber ring cavity, a flat rectangular optical spectrum with 3 dB bandwidth of 8.1 nm is obtained, with power fluctuation of < 0.5 dB. Inserting a fiber Fabry-Perot filter at the output of passively mode-locked fiber laser, we can simultaneously obtain 40 channels with 0.2 nm wavelength spacing, under the condition of < 3 dB power uniformity. After wavelength-division demultiplexing and optic-to-electronic conversion, the full width at half maximum (FWHM) of single channel pulse is measured to be 30 ps while the repetition rate of pulse train is 20.3 MHz.