Title :
The detuning characteristics of rational harmonic mode-locked semiconductor optical amplifier fiber-ring laser using backward optical sinusoidal-wave injection modulation
Author :
Lin, Gong-Ru ; Hsueh, Pai-Shen ; Wu, Hsiao-Hua ; Liao, Yu-Sheng
Author_Institution :
Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu, Taiwan
fDate :
3/1/2005 12:00:00 AM
Abstract :
The modulation waveform, power, and frequency detuning dynamics of a semiconductor optical amplifier fiber-ring laser (SOAFL) harmonic and rational-harmonic mode-locked by using backward injection of a large-signal sinusoidal-wave modulated Fabry-Pe´rot laser diode (FPLD) are studied. The shortest pulsewidth of 53.3 ps at 1 GHz with spectral linewidth of 0.09 nm at modulation power of 17 dBm can be obtained, which corresponds to a time-bandwidth product of 2.8. The threshold modulation power and the maximum frequency detuning range for harmonic mode-locking of the SOAFL are 11.5 dBm and 180 kHz, respectively. The mode-locked SOAFL gradually recovers back to sinusoidal-wave modulation mode at the detuning frequency beyond ±400 kHz. The pulse broadening slopes for the positive- and negative-frequency detuning regions of 0.48 and 0.375 ps/kHz are determined, respectively. By enlarging the modulating power and detuning the modulation frequency of FPLD, the SOAFL can be rational-harmonic mode-locked up to 12 GHz with 33-ps pulsewidth.
Keywords :
high-speed optical techniques; laser mode locking; laser tuning; optical fibre amplifiers; optical modulation; ring lasers; semiconductor optical amplifiers; spectral line breadth; 0.09 nm; 1 GHz; 180 kHz; 33 ps; 53.3 ps; Fabry-Perot laser diode; backward optical sinusoidal-wave injection modulation; fiber-ring laser; frequency detuning; modulation waveform; pulse broadening; rational harmonic mode-locked semiconductor optical amplifier; spectral linewidth; Fiber lasers; Frequency; Laser mode locking; Optical fibers; Optical modulation; Power system harmonics; Pulse modulation; Semiconductor lasers; Semiconductor optical amplifiers; Stimulated emission; Backward injection; Fabry–PÉrot laser diode; cross-gain modulation; fiber-ring laser; frequency detuning; harmonic and rational-harmonic; mode-locking; semiconductor optical amplifier;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2004.839987
