The temperature sensitivity of cross talk between closely spaced cores in a common cladding is calculated and compared with measurements. A periodic variation in core contrast is observed when one core is illuminated and the temperature is changed. The variation in light distribution, which is ascribable to a change in coupling between the cores, agrees with theoretical predictions. It is shown that cross talk can be made to be a sensitive, predictable function of temperature or by proper selection of materials, wavelength, and fiber geometry essentially temperature independent.
© 1983 Optical Society of America
G. Meltz, J. R. Dunphy, W. W. Morey, and E. Snitzer, "Cross-talk fiber-optic temperature sensor," Appl. Opt. 22, 464-477 (1983)