PASSIVE TEMPERATURE-COMPENSATING PACKAGE FOR OPTICAL-FIBER GRATINGS

We demonstrate a compact, passive temperature-compensating package for fiber gratings. The grating is mounted under tension in a package com prising two materials with different thermal-expansion coefficients. A s the temperature rises the strain is progressively released, compensa ting the temperature dependence of the Bragg wavelength. A fiber grati ng mounted in a package 50 mm long and 5 mm in diameter exhibited a to tal variation in Bragg wavelength of 0.07 nm over a 100 degrees C temp erature range, compared with 0.92 nm for an uncompensated grating. (C) 1995 Optical Society of America