Spread-spectrum technique for passive multiplexing of reflective frequency-out fiber optic sensors exhibiting identical characteristics

Deepak G. Uttamchandani; Yun-Jiang Rao; Brian Culshaw

doi:10.1117/12.141292

5 March 1993 Spread-spectrum technique for passive multiplexing of reflective frequency-out fiber optic sensors exhibiting identical characteristics

Deepak G. Uttamchandani, Yun-Jiang Rao, Brian Culshaw

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Proceedings Volume 1797, Distributed and Multiplexed Fiber Optic Sensors II; (1993) https://doi.org/10.1117/12.141292
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

A spread spectrum multiplexing (SSM) system for an array of reflective, frequency-out fiber optic sensors of identical characteristics has been developed. This system allows accessing of a large number of sensors with high sampling frequency of up to a few MHz and simultaneously permits a considerable improvement of the system optical power budget over single pulse time-division multiplexing methods. An experimental SSM system has been assembled and tested and the experiments have successfully demonstrated the passive multiplexing of eight reflective frequency-out fiber optic sensors with a vibration frequency of 17.36 kHz. Crosstalk of approximately -22 dB has been observed, which is in agreement with theoretical results expected from consideration of the code length of the pseudorandom bit sequence used and the sensor number in the network. Additionally, a novel digital PRBS exhibiting zero auto-correlation at non-zero delays has been modelled and experimentally tested, yielding promising results for sensor multiplexing.

Citation Download Citation

Deepak G. Uttamchandani, Yun-Jiang Rao, and Brian Culshaw "Spread-spectrum technique for passive multiplexing of reflective frequency-out fiber optic sensors exhibiting identical characteristics", Proc. SPIE 1797, Distributed and Multiplexed Fiber Optic Sensors II, (5 March 1993); https://doi.org/10.1117/12.141292

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KEYWORDS

Sensors

Multiplexing

Fiber optics sensors

Reflectivity

Modulation

Optical correlators

Sensor networks

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