Wavelength insensitive fiber optic sensor based on an axially strained fused coupler

Andre Booysen; Pieter L. Swart; Stephanus J. Spammer

doi:10.1117/12.169913

9 March 1994 Wavelength insensitive fiber optic sensor based on an axially strained fused coupler

Andre Booysen, Pieter L. Swart, Stephanus J. Spammer

Proceedings Volume 2070, Fiber Optic and Laser Sensors XI; (1994) https://doi.org/10.1117/12.169913
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States

Abstract

A wavelength-insensitive fiber optic sensor configuration is presented. It is based on two variable ratio couplers in series, the one acting as a reference while the other acts as the sensing element. Difference-over-sum processing yields linear outputs for the reference and sensor which are insensitive to fluctuations in optical intensity. By subtracting the reference from the sensor output wavelength compensation is achieved. The characteristic behavior of this sensor was determined experimentally and the results compared to computer simulations which were based on a theoretical model. Theoretical and experimental results show good agreement. The compensation technique is suitable for any variable ratio coupler sensor and is not limited to axially strained fused tapered couplers.

Citation Download Citation

Andre Booysen, Pieter L. Swart, and Stephanus J. Spammer "Wavelength insensitive fiber optic sensor based on an axially strained fused coupler", Proc. SPIE 2070, Fiber Optic and Laser Sensors XI, (9 March 1994); https://doi.org/10.1117/12.169913

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