Improvement of the residual sidemode suppression ratio of injection locked DFB laser using wide-spaced frequcny comb

We present a widely-separated multi-frequency source generated from fiber laser comb using the mode filtering by a Fabry-Pèrot cavity and an injection locking technique. An optical frequency comb was filtered each modes which spacing is 1.5 GHz by a spectral-mode-filtering method by a Fabry-Pérot cavity. The spectral-mode-filtered optical frequency comb which 1.5 GHz is used as the master laser for the injection locking to two distributed-feedback-lasers (DFB, slave lasers). Using these two techniques, single mode selection and power amplification of each comb mode are possible for the generation the widely-separated coherent multi-frequency source from the mode-locked fiber laser.