Mode-locked and noise characteristics of fiber grating semiconductor laser

Abstract

The noise and mode-locking phenomena of a hybrid soliton pulse source (HSPS) utilizing Gaussian apodized fiber Bragg grating is described. The HSPS is modeled by a time-domain solution of the coupled-mode equations including spontaneous emission noise, and relative intensity noise (MN) is calculated using numerical solutions of these equations. It is found that transform limited pulses are not generated with Gaussian apodized grating even if system is properly mode-locked at the fundamental frequency. If transform limited pulses are not obtained, a noise peak in the RIN spectrum does not occur at the fundamental frequency.