Abstract

By operating an intracavity semiconductor-optical-amplifier- (SOA-) based high-pass filter at the nearly transparent current condition, the supermode noise (SMN), the relaxation oscillation, and the single-sideband (SSB) phase noise can be simultaneously suppressed in an actively mode-locked erbium-doped fiber laser (EDFL). The SOA at the nearly transparent condition enhances the SMN suppression ratio of the EDFL from 32to76dB at the cost of the phase noise degrading from 114to104.2dBcHz and broadening the pulse width from 36to61ps. With an optical bandpass filter, the SSB phase noise and the SMN suppression ratio can be further improved to 110dBcHz and 81dB, respectively. The EDFL pulse can be further shortened to 3.1ps with a time–bandwidth product of 0.63 after compression.

© 2005 Optical Society of America

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