title: Tunable single frequency fiber laser based on FP-LD injection locking.
abstract: We propose and demonstrate a tunable single frequency fiber laser based on Fabry Pérot laser diode (FP-LD) injection locking. The single frequency operation principle is based on the fact that the output from a FP-LD injection locked by a multi-longitudinal-mode (MLM) light can have fewer longitudinal-modes number and narrower linewidth. By inserting a FP-LD in a fiber ring laser cavity, single frequency operation can be possibly achieved when stable laser oscillation established after many roundtrips through the FP-LD. Wavelength switchable single frequency lasing can be achieved by adjusting the tunable optical filter (TOF) in the cavity to coincide with different mode of the FP-LD. By adjustment of the drive current of the FP-LD, the lasing modes would shift and wavelength tunable operation can be obtained. In experiment, a wavelength tunable range of 32.4 nm has been obtained by adjustment of the drive current of the FP-LD and a tunable filter in the ring cavity. Each wavelength has a side-mode suppression ratio (SMSR) of at least 41 dB and a linewidth of about 13 kHz.
authors.affiliation: Institute of Photonics Technology, Jinan University, Guangzhou, China.
authors.forename: Aiqin
authors.initials: A
authors.lastname: Zhang
authors.forename: Xinhuan
authors.initials: X
authors.lastname: Feng
authors.forename: Minggui
authors.initials: M
authors.lastname: Wan
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Li
authors.forename: Bai-ou
authors.initials: BO
authors.lastname: Guan
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D020349:Surface Plasmon Resonance / Q000295:instrumentation*