Signal conditioning for compensating nonlinearity and nonrepeatability of an optical frequency scanning laser implemented in a C-OFDR system.

Applied optics

PubMedID: 28157897

Martínez Manuel R, Sutherland HE. Signal conditioning for compensating nonlinearity and nonrepeatability of an optical frequency scanning laser implemented in a C-OFDR system. Appl Opt. 2017;56(3):457-461.
Reported systems using coherent optical frequency-domain reflectometry, C-OFDR, rely on the linearity of the scanning rate of the tunable laser and sometimes on its repeatability. In this work, we present the implementation of signal-conditioning algorithms for a fiber temperature sensor system based on coherent optical frequency-domain reflectometry. Postacquisition signal conditioning removes any nonlinearity and nonrepeatability effects and allows synchronization of the whole system. A low reflectivity, 0. 1%, fiber Bragg grating, placed in a reference interferometer, is implemented for removing the nonrepeatability of the optical source. The spatial resolution achieved by the temperature fiber sensor is 0. 36 mm, with repeatability of 0. 032°C, while using telecommunication-grade components.