標題: A 3.5-ps mode-locked semiconductor optical amplifier fiber laser generated by 60-ps backward optical dark pulse-train injection
作者: Chiu, IH
Liao, YS
Chang, YC
Lin, GR
光電工程學系
Department of Photonics
關鍵字: semiconductor optical amplifier (SOA);Mach-Zehnder intensity modulator;come-like dark pulse-train;modulation;optical cross-gain modulation;harmonic mode-locking;nonlinear compression
公開日期: 2005
摘要: The relationship between the backward optical injection waveform and the mode-locked Pulse shape of semiconductor optical amplifier fiber laser (SOAFL) is studied. The SOA plays both the roles of a gain medium and an optically controlled modulator in this work. The injected optical comb-like bright and dark pulse-train with 60-ps pulsewidth was generated using a Mach-Zehnder intensity modulator (MZM) which DC-biased voltage of 1.7 V and 7.2 V, respectively. The backward injection of optical dark pulse-train results in a wide gain-depletion width (and a narrow gain window) within one modulation period, which is necessary for perfect mode-locking the SOAFL. In opposite, the backward injection of short optical pulse of bright optical pulse-train only causes a less pronounced gain-depletion effect. Such a broadened gain window can hardly initiate the mode-locking process. The backward comb-like dark pulse-train modulation IS Much easier to initiate harmonic mode-locking in the SOAFL than the bright pulse-train or sinusoidal-wave, wave injection, which generates pulsewidth as short as 15 ps at 1 GHz. After propagating through 195m-long dispersion-compensating fiber, the pulsewidth of the mode-locked SOAFL can be linearly compressed to 13.5 ps. The linewidth and time-bandwidth product of the compressed SOAFL pulses are 1.78 nm and 0.8, respectively. The pulsewidth can further be nonlinearly compressed by using a 4695m-long single-mode fiber. The shortest mode-locked SOAFL pulsewidth of 3.5 ps at repetition frequency of I GHz by using cross-gain modulation technique is reported for the first time.
URI: http://hdl.handle.net/11536/17876
http://dx.doi.org/10.1117/12.587938
ISBN: 0-8194-5683-7
ISSN: 0277-786X
DOI: 10.1117/12.587938
期刊: Fiber Lasers II: Technology, Systems, and Applications
Volume: 5709
起始頁: 363
結束頁: 370
Appears in Collections:Conferences Paper


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