Sensors & Transducers Journal

    (ISSN 1726- 5479)

Vol. 82, Issue 8, August 2007, pp. 1431-1442

Modeling and Analysis of Fiber Optic Ring Resonator Performance as Temperature Sensor

Sanjoy Mandal, S. K. Ghosh, T. K. Basak

^*College of Engineering and Management Kolaghat

Jadavpur University, Department of Electrical Engineering,

Jadavpur, Calcutta, 700032, India

^*Tel.: +919433292625, fax: +913228250880

^*E-mail: sanjoy_cem@yahoo.com

Received: 25 July 2007   /Accepted: 20 August 2007   /Published: 27 August 2007

Abstract: A novel temperature sensor using multiple fiber optic ring resonator is presented in the present article. The sensor operates by means of monitoring the changes in the transmission spectrum of a high finesse fiber optic ring resonator. Delay line signal processing technique, developed by a few previous researchers is used to develop the signal flow graph of fiber optic ring resonator and Mason’s rule is implemented to determine its overall transmittance in discrete domain. Simulations in MATLAB environment were carried out to obtain the sensor design and the transfer characteristics of the ring resonator based temperature sensor. The simulated frequency response of the single ring resonator is compared with those of previously published results by Heebner et al. [1], which are in very close agreement. Sensitivity of the resonator can be improved by introducing double ring resonator. A simple design methodology to improve the performances of the sensor is also introduced in the article.

Keywords: Mason’s rule, Ring resonator, Temperature sensor, Free spectral range

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