Abstract
A frequency domain optical reflectometer which uses a GaAs interdigital photodetector both for optical detection and for mixing is described. A simple receiver with a postdetection bandwidth of the order of 10 kHz suffices for distance resolution of 10 m with this technique, greatly simplifying the electronics by comparison with pulsed reflectometers or swept frequency reflectometers employing electronic mixing. With available lasers the instrument could detect discrete optical reflections of −57 dB at a distance of 1 km. It is intended for remote measurement of refractive index in fluids, using the Fresnel reflection from a square-cleaved fiber as the sensor.
© 1990 Optical Society of America
Full Article | PDF ArticleMore Like This
R. I. MacDonald
Appl. Opt. 20(10) 1840-1844 (1981)
S. Gareth Pierce, Alistair MacLean, and Brian Culshaw
Appl. Opt. 39(25) 4569-4581 (2000)
Tae-Jung Ahn, Ji Yong Lee, and Dug Young Kim
Appl. Opt. 44(35) 7630-7634 (2005)