DOUBLE-PASS FULLY ISOLATED BROADBAND OPTIC SIGNAL SOURCE FOR USE IN FIBER OPTIC INTERFEROMETRIC SENSORS

摘要

A fiber optic interferometric sensor system, comprising: a pump light source (14); an optical fiber (16) arranged to receive pump light from the pump light source; a first optical isolation device (18) connected to the optical fiber, the first optical isolation device being arranged to allow only one-way propagation from the pump light source; a wavelength division multiplexer (26) arranged to receive pump light that passes through the optical isolation device; a gain fiber (34) connected to the wavelength division multiplexer and arranged to be optically pumped by the pump light such that the gain fiber emits a broadband optical signal that propagates to the wavelength division multiplexer; an output optical fiber (31) connected to the wavelength division multiplexer and arranged to guide a portion of the broadband optical signal emitted by the gain fiber; a second optical isolation device (50) connected to the output optical fiber, the second optical isolation device being arranged to allow only one-way propagation from the output optical fiber; and a fiber optic interferometric sensor (12) connected to the second optical isolation device to receive the broadband optical signals guided by the output optical fiber. 2812 ט" ו בכסליו התשס" ד - December 10, 2003