TEMPERATURE-COMPENSATED OPTICAL GRATING DEVICE

摘要

An improved temperature-compensated optical grating device (170) includes a temperature-compensating structure (174) including a plurality of members (194, 196) that are selected and arranged to provide an effective coefficient of thermal expansion that is negative with respect to two mounting points for an optical fiber grating (172), wherein the improvement is achieved by making at least one of the members of the temperature-compensating structure from a material having a low coefficient of thermal expansion that decreases with increasing temperature and at least one other member having a high coefficient of thermal expansion that increases with increasing temperature.