Abstract
Distributed Brillouin-based optical fiber sensors are of a great interest for the monitoring of strain and temperature distributions within large structures in civil engineering. Injection locking of two DFB semiconductor lasers is a simple and rather universal technique that allows generation of low-noise coherent signals (AM, FM, frequency-shifted or frequency sweeping optical waveforms) relevant for operation with different Brillouin sensors. The accuracy of such sensors among other factors is limited by the Stokes intensity noise [1,2] dominating in MHz-frequency range.
© 2007 IEEE
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