title: Development of a multiwavelength Raman fiber laser based on phase-shifted fiber Bragg gratings for long-distance remote-sensing applications.
abstract: We propose a simple and flexible multiwavelength Raman fiber laser based on phase-shifted fiber Bragg gratings (FBGs) and a tunable chirped FBG. Using a simple multiwavelength Raman laser configuration with a single phase-shifted FBG and a tunable chirped FBG, we readily achieved simultaneous two-channel sensing probes with a high extinction ratio of more than 50 dB over a 50-km distance. The multiwavelength output was stable and the peak fluctuation was less than 0.5 dB. The temperature and strain sensitivities are estimated to be 10.1 pm/degrees C and 7.5 pm/microstrain, respectively.
authors.affiliation: Photonics Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, South Korea. yyghan@kist.re.kr
authors.forename: Young-Geun
authors.initials: YG
authors.lastname: Han
authors.forename: T V A
authors.initials: TV
authors.lastname: Tran
authors.forename: Sang-Hyuck
authors.initials: SH
authors.lastname: Kim
authors.forename: Sang Bae
authors.initials: SB
authors.lastname: Lee
mesh_terms: D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods; D012371:Robotics / Q000295:instrumentation*; D013059:Spectrum Analysis, Raman / Q000295:instrumentation* / Q000379:methods