We report on the development of a precision-tunable, dual wavelength, optical light source suitable for high
performance fiber optic Brillouin scattering distributed sensing. The design is based on an Optical Phase Locked Loop
(OPLL) system using novel narrow linewidth, low frequency noise and high stability PLANEX external cavity
semiconductor. The inherent wavelength stability of PLANEX lasers (typically an order of magnitude better that any
DFB laser on the market) enable the OPLL to operate continuously over a wide ambient temperature range without
degradation in wavelength locking performance. The OPLL architecture is implemented with polarization maintaining
(PM) components and has a very low beat frequency jitter on the order of few kHz. The OPLL frequency tuning range
is between 8 and 14 GHz, with fast tuning of sweep steps on the order of 100 μsec. Such a frequency tuning range
covers practically all corresponding temperature and strain sensing applications based on the measurement of the
frequency shift produced by spontaneous or stimulated Brillouin scattering, and thus is a versatile and enabling
technology for both BOTDA/BOTDR distributed sensing systems.
Conference Committee Involvement (3)
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security VII
10 March 2013 | San Diego, California, United States
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security VI
12 March 2012 | San Diego, California, United States
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security V
7 March 2011 | San Diego, California, United States
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