Title :
Passive Q-switching in 25-km ultra long cavity all-fiber ring laser
Author :
Li, Nanxi ; Xue, Jin ; Wong, Jia Haur ; Wu, Kan ; Ouyang, Chunmei ; Aditya, Sheel ; Shum, Perry Ping
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
Abstract :
In this paper, passive Q-switching is investigated in a 25 km ultra long cavity all-fiber ring laser operating in anomalous dispersion regime. We experimentally demonstrate Q-switched pulses with kHz repetition rate and nano-joule scale pulse energy. More specifically, we obtain a Q-switched pulse train with 52.083 kHz repetition rate and average pulse energy of 10.880 nJ. The Q-switching state threshold for this laser cavity is found to be 420 mW. Stable Q-switching state is observed when the pump power exceeds 570 mW. As our setup has limited pump power, mode-locked state is not observed. However, by implementing a laser diode pump with higher pump power together with a longer length of erbium-doped fiber (EDF) as well as a lower overall cavity loss, this scheme has the potential to achieve mode-locking state.
Keywords :
Q-switching; erbium; fibre lasers; laser cavity resonators; laser mode locking; optical fibre dispersion; optical pumping; ring lasers; anomalous dispersion regime; distance 25 km; energy 10.880 nJ; erbium-doped fiber; frequency 52.083 kHz; laser diode pump; mode-locked state; nano-joule scale pulse energy; overall cavity loss; passive Q-switching; power 420 mW; pump power; ultra long cavity all-fiber ring laser; Cavity resonators; Erbium-doped fiber lasers; Laser mode locking; Optical fiber communication; Optical fiber dispersion; Optical fiber polarization; Fiber laser; High energy; Low repetition rate; Q-switched laser; Ultra-long cavity;
Conference_Titel :
Information, Communications and Signal Processing (ICICS) 2011 8th International Conference on
Conference_Location :
Singapore
Print_ISBN :
978-1-4577-0029-3
DOI :
10.1109/ICICS.2011.6174252
