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Title: Effects of active fiber length on the tunability of erbium-doped fiber ring lasers
Authors: Dong, X
Shum, P
Ngo, NQ
Chan, CC
Guan, BO
Tam, HY 
Keywords: Doping (additives)
Fabry-Perot interferometers
Fiber lasers
Fiber optics
Fiber tuning
Issue Date: 29-Dec-2003
Publisher: Optical Society of America
Source: Optics express, 29 Dec. 2003, v. 11, no. 26, p. 3622-3627 How to cite?
Journal: Optics express 
Abstract: We numerically investigate the effects of the active fiber length on the tunability of erbium-doped fiber ring lasers for the cases of with and without pair-induced quenching (PIQ). The numerical results are confirmed by experiments. We have found that the tuning range shifts from C-band to L-band with an increase in the active fiber length. A maximum tuning range of over 100 nm, covering both the C- and L-band, can be achieved with an optimized active fiber length. It is also found that the PIQ is favorable for Lband lasing though it reduces the output power and degrades the power flatness. Using these findings, a novel method employing active fiber length switching is proposed to extend the tuning range of the laser, which is only limited by the free spectral range (FSR) of the tunable filter. A large tuning range of 102 nm is obtained using a tunable fiber Fabry-Perot filter with an FSR of 75 nm.
ISSN: 1094-4087
DOI: 10.1364/OE.11.003622
Rights: © 2003 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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