Abstract

A backward dark-optical-comb-injection mode-locked semiconductor optical amplifier fiber laser (SOAFL) with a femtosecond pulse width and an ultrahigh supermode-noise suppressing ratio (SMSR) is primarily demonstrated. The mode-locked SOAFL pulse with a spectral linewidth of 0.45nm is shortened from 15to8.6ps under chirp compensation in a 420m long dispersion-compensated fiber, corresponding to a time–bandwidth product of 0.48. The eighth-order soliton is obtained by the nonlinearly soliton’s compression of the chirp-compensated SOAFL pulse in a 112m long single-mode fiber at an input peak power of 51W, providing the pulse width, the linewidth, and the nearly transform-limited time–bandwidth product are <200fs, 13.8nm, and 0.34, respectively. The phase noise and integrated timing jitter at an offset frequency below 1MHz are 105dBcHz and 0.8ps, respectively. An ultrahigh pulse-compression ratio of 43 and a SMSR of 87dB for the eighth-order SOAFL soliton are reported.

© 2006 Optical Society of America

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