Highly Stable, Actively Mode-Locked Er-Doped Fiber Laser Utilizing Relaxation Oscillation as Detuning Monitor

Hidehiko TAKARA  Satoki KAWANISHI  Masatoshi SARUWATARI  

IEICE TRANSACTIONS on Electronics   Vol.E81-C   No.2   pp.213-220
Publication Date: 1998/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Ultrashort Optical Pulse Technologies and their Applications)
mode-locked fiber laser,  optical pulse generation,  relaxation oscillation,  stabilization,  

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We investigate the relaxation oscillation characteristics of an actively mode-locked fiber laser and a novel stabilizing method of the laser theoretically and experimentally. The stabilizing method controls cavity length to suppress the rf power of the relaxation oscillation frequency of the laser output, and can directly monitor the stability of the laser to ensure the most stable operation. With this method, the rf power ratio between mode-locking frequency and the background noise can be kept to more than 70 dB, and highly stable transform-limited pulse generation is achieved. Bit-error-free operation at 6. 3 GHz over 10 hours is successfully demonstrated. The stability of the center wavelength of the laser output and the required accuracy of cavity control for high-speed laser operation are also discussed.