Abstract
A novel configuration for a dual-wavelength fiber ring laser with improved lasing stability realized
through the use of an injection-coupled optoelectronic oscillator (OEO) is proposed and demonstrated, and its
application to transverse load sensing is studied. The OEO-coupled dual-wavelength laser has two mutually coupled
loops: the fiber ring loop and the OEO loop. In the fiber ring loop, a polarization-maintaining phase-shifted fiber
Bragg grating is incorporated to generate two optical wavelengths with the wavelength spacing determined by the
birefringence of the polarization-maintaining (PM) fiber. In the OEO loop, a microwave signal with its frequency also
determined by the birefringence of the PM fiber is generated, which is fed into the fiber ring loop to injection lock
the dual wavelengths. Due to the injection locking, a very stable dual-wavelength operation is established. The use of
the dual wavelengths for high-resolution and high-speed transverse load sensing is then implemented. The sensitivity
of the transverse load sensor is measured as high as +9.7573 and −9.7350 GHz/(N/mm), along the fast
and slow axes, respectively. The high frequency purity and stability of the generated microwave signal permits very
reliable and high accuracy measurement and the microwave frequency interrogation allows the system to operate at an
ultra-high speed.
© 2014 IEEE
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