Abstract

Evanescent coupling between a side-polished single-mode optical fiber and a single-mode, pH-sensitive Langmuir–Blodgett overlay is used to demonstrate an intrinsic fiber-optic pH sensor. The sensor shows a wavelength sensitivity of 18.8±0.8 nm/pH and a transmission sensitivity of 9.7±0.8 dB/pH when operating at 750  nm.

© 1997 Optical Society of America

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