Title :
Application of a Self-Sweeping Yb-Doped Fiber Laser for High-Resolution Characterization of Phase-Shifted FBGs
Author :
Lobach, Ivan A. ; Kablukov, S.I.
Author_Institution :
Fiber Opt. Lab., Inst. of Autom. & Electrometry, Novosibirsk, Russia
Abstract :
Application of a self-sweeping self-pulsing laser for high-resolution spectral analysis of π-shifted FBGs has been demonstrated for the first time. It is shown that the self-sweeping laser generates nearly single-frequency radiation during a single pulse. This fact allows us to characterize the shift-induced dip of 14 MHz width in the FBG reflection spectrum. Nonlinear deformation of the measured ultranarrow spectral structure with increasing incident power is observed. Sampling interval during the scan is shown to be limited by pulse to pulse frequency shift, which is equal to the cavity mode spacing of 6 MHz. The main feature of the applied technique is its simplicity due to the absence of special elements for frequency scanning.
Keywords :
Bragg gratings; deformation; fibre lasers; optical phase shifters; ytterbium; π-shifted FBG; FBG reflection spectrum; Yb-doped fiber laser; high-resolution characterization; high-resolution spectral analysis; nonlinear deformation; phase-shifted FBG; pulse frequency shift; self-sweeping laser; self-sweeping self-pulsing laser; single-frequency radiation; ultranarrow spectral structure; Bragg gratings; Fiber lasers; Laser modes; Measurement by laser beam; Optical fiber polarization; Reflection; Bragg gratings; Fiber lasers; optical pulses; spectral analysis;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2013.2278177