Suppression of phase and supermode noise in a harmonic mode-locked erbium-doped fiber laser with a semiconductor-optical-amplifier-based high-pass filter
2005; Optica Publishing Group; Volume: 30; Issue: 14 Linguagem: Inglês
10.1364/ol.30.001834
ISSN1539-4794
AutoresGong‐Ru Lin, Ming-Chung Wu, Yung-Cheng Chang,
Tópico(s)Photonic Crystal and Fiber Optics
ResumoBy 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 32to76?dB at the cost of the phase noise degrading from ?114to?104.2?dBc?Hz and broadening the pulse width from 36to61?ps. With an optical bandpass filter, the SSB phase noise and the SMN suppression ratio can be further improved to ?110?dBc?Hz and 81?dB, respectively. The EDFL pulse can be further shortened to 3.1?ps with a time–bandwidth product of 0.63 after compression.
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