Title :
Competition of Rational Harmonic Mode-Locking and Continuous-Wave Lasing in Semiconductor Optical Amplifier Fiber Laser Under Optical Pulse Injection
Author :
Lee, Chao-Kuei ; Kang, Jung-Jui ; Lin, Gong-Ru
Author_Institution :
Dept. of Photonics, Nat. Sun Yan-Sen Univ., Kaohsiung
fDate :
4/1/2009 12:00:00 AM
Abstract :
Twentieth-order rational harmonic mode-locking (RHML) semiconductor optical amplifier fiber laser (SOAFL) pulses are demonstrated by using 1-GHz backward dark-optical comb injection. Maximum frequency detuning range of plusmn 300 Hz, broadened pulsewidth of 35 ps, and highest average power of 0.4 muW for twentieth-order RHML-SOAFL pulse are characterized. The extraordinary phenomena on the red-shifted wavelength from 1535.5 to 1541.5 nm and the corresponding spectral linewidth reduced from 12 to 3 nm are observed with the RHML order increasing to 8 or higher. Such a less pronounced RHML mechanism at higher orders occurred in the optically injection mode-locked SOAFL is mainly attributed to the weak mode-locking strength at high RHML orders as compared to continuous-wave lasing mechanism.
Keywords :
laser mode locking; optical fibre amplifiers; semiconductor optical amplifiers; continuous-wave lasing; dark-optical comb injection; fiber laser; frequency 1 GHz; optical pulse injection; rational harmonic mode-locking; semiconductor optical amplifier; Erbium-doped fiber lasers; Fiber lasers; Frequency; Laser mode locking; Optical fibers; Optical pulses; Pulse amplifiers; Pulse modulation; Semiconductor lasers; Semiconductor optical amplifiers; Continuous-wave lasing; dark-optical comb; injection; linewidth; rational harmonic mode-locked; semiconductor optical amplifier;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2008.927771
