Title :
Rational harmonic mode-locking of erbium-doped fiber laser at 40 GHz using a loss-modulated Fabry-Pe´rot laser diode
Author :
Lin, Gong-Ru ; Chang, Yung-Cheng ; Wu, Jung-Rung
Author_Institution :
Inst. of Electro-Opt. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
Rational harmonic mode-locking of an Erbium-doped fiber ring laser (EDFL) at repetition frequency of 40 GHz is demonstrated by using a purely loss-modulated Fabry-Pe´rot laser diode (FPLD) at 1 GHz. The FPLD is neither lasing nor gain-switching, which requires a threshold modulation power of 18 dBm to initiate harmonic mode-locking of the EDFL. After chirp compensation, the nearly transform-limited pulsewidth and spectral linewidth of 3 ps and 1.3 nm are obtained at repetition frequency of 40 GHz, which corresponds to a time-bandwidth product of 0.31. The EDFL gradually evolves from harmonic mode-locking to injection-locking mode as the FPLD changes from loss-modulation to gain-switching mode by increasing its dc driving current.
Keywords :
Fabry-Perot resonators; chirp modulation; erbium; fibre lasers; laser cavity resonators; laser mode locking; laser tuning; optical losses; optical modulation; ring lasers; semiconductor lasers; spectral line breadth; 1 GHz; 40 GHz; Fabry-Perot laser diode; chirp compensation; erbium-doped fiber laser; fiber ring laser; gain-switching mode; injection-locking mode; loss-modulation; rational harmonic mode-locking; spectral linewidth; transform-limited pulsewidth; Diode lasers; Erbium-doped fiber amplifier; Erbium-doped fiber lasers; Laser mode locking; Optical losses; Power harmonic filters; Pulse amplifiers; Pulse modulation; Radio frequency; Ring lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.831057
