Abstract
We propose a unique all-fiber Q-switched erbium-doped
fiber ring laser. It consists of a phase-shifted fiber Bragg grating (FBG)
and an apodized FBG reflector. By using the piezoelectric transducer (PZT)
to periodically stretch the apodized FBG and detune it with the phases-shifted
FBG, the cavity loss of the fiber ring laser is switched between high and
low states to achieve Q-switching. This Q-switched fiber laser has advantages
of narrow spectral bandwidth, stable oscillation wavelength, and the repetition
rate of the Q-switched pulses can be double of the PZT modulation frequency.
A numerical model is developed and presented to simulate and analyze this
FBGs-based Q-switched fiber ring laser with consideration of the dynamic response
of FBGs during Q-switching. We experimentally demonstrate 10 and 20 kHz Q-switching
operation with 10 kHz PZT modulation frequency. The experimental result is
similar to the simulation result.
© 2008 IEEE
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