FREQUENCY-DOMAIN OPTICAL REFLECTOMETER USING A GAAS OPTOELECTRONIC MIXER

被引：8
|
作者：
MACDONALD, RI
SWEKLA, BE
机构：
[1] Alberta Telecommunications Research Centre, Edmonton, AB, T6E 5Y4
来源：
APPLIED OPTICS | 1990年 / 29卷 / 31期
关键词：
D O I：
10.1364/AO.29.004578
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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 squarecleaved fiber as the sensor. © 1990 Optical Society of America.
引用
收藏
页码：4578 / 4582
页数：5
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