Abstract
Optical fiber sensors are gaining widespread usage. A few tens of sensors are usually involved in a typical application. In order to reduce the number of optical components in a sensor system, a multiplexing scheme is required. Sensors can be multiplexed in the time domain or the frequency domain. We are proposing a frequency-domain implementation. The experimental setup of the step frequency duplexer is shown in Fig. 1. The amplitude modulation frequency of the laser light is stepped. At each step, the magnitude and phase of the detected signal is measured. This data is then discretely Fast Fourier Transformed to demultiplex the sensors. This technique requires that the length of the optical path from the laser diode through a particular sensor to the detector be unique. It can be shown that the relative optical power incident on the detector through an optical path of physical length zk = za + kΔz is given by:
© 1993 Optical Society of America
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