Patent ID: 7362939

Claim:
A LPG component for use with an erbium-doped fiber amplifier (EDFA), the LPG component comprising: a grating region including a periodic change of a refractive index along a fiber axis direction in a predetermined part of a core of an optical fiber including said core and a cladding layer surrounding said core, said core being doped with a 1st material having a positive temperature co-efficient and sensitive to exposure of ultraviolet light, and said cladding layer, having a refractive index lower than that of said core and being doped with a 2nd material having a negative temperature co-efficient, wherein a combination of a period of said grating region and a difference between said positive temperature coefficient of said core and said negative temperature coefficient of said cladding layer is configured to provide an increased temperature dependency of a transmission loss profile of said LPG component, said transmission loss profile of said LPG component being designed to shift in a wavelength direction in response to a temperature change so as to substantially compensate for a temperature dependent gain variation of said EDFA.