Abstract
This paper explains the principles behind multiwavelength operation
of an erbium-doped fiber laser (EDFL) under the combined effect of cavity
phase modulation and periodic wavelength filtering. A mathematical model is
developed to simulate the behaviour of the multiwavelength EDFL, both in time
and frequency domains. The effects of various parameters such as pump power,
filter channel spacing, modulation index and frequency are observed and explained.
An all-fiber EDFL was constructed, using a piezo-transducer-based phase modulator
and a Sagnac loop periodic filter, to validate the theoretical results. The
effects of pump power, modulation frequency and modulation index were monitored
experimentally, justifying the theoretical explanation. The multiwavelength
EDFL has several potential applications in fiber sensing due to its flexible
all-fiber design.
© 2009 IEEE
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