Patent ID: 6584248
Filing Date: 2003-06-24
Classification: G02B

Abstract:
A temperature-compensated optical fiber grating, comprising:an optical grating contained in an elongated section of an optical fiber; and a temperature-compensating structure including a plurality of temperature-compensating members connected together; a first temperature-compensating member connected to the optical fiber at a first point spaced away from one end of the fiber grating, a second temperature-compensating member connected to the optical fiber at a second point spaced away from another end of the fiber grating, at least one of the temperature-compensating members having a coefficient of thermal expansion that decreases with increasing temperature and which is lower than the coefficient of thermal expansion of at least one other temperature-compensating member, the temperature-compensating members arranged to have an effective coefficient of thermal expansion that is negative whereby the tensile strain on the portion of the optical fiber containing the fiber grating is reduced when the temperature is increased and the tensile strain on the portion of the optical fiber containing the fiber grating is increased when the temperature is decreased.