SIMULTANEOUS INTERROGATION OF MULTI WAVELENGTH-MODULATED FIBER OPTICAL SENSORS BY MODULATING AN ARRAYED WAVEGUIDE GRATING BASED DEMULTIPLEXER

摘要

A compact interrogator for the simultaneous interrogation of multi wavelength-modulatedfiber optical sensors, includes a planar waveguide based demultiplexerreceiving inputsignals from the sensors. An array of detectors is coupled to outputwaveguides of thedemultiplexer corresponding to different nominal wavelengths. A tuning elementmatchesthe nominal wavelengths of the output waveguide to the input signals from.therespectivesensors to find the wavelengths of the individual sensors to be interrogated.