Patent ID: 7127140

Claim:
A fiber Bragg grating device, comprising: an FBG mount that is constituted by sequentially stacking a temperature control plate, a base plate, and a mounting plate; and a superstructured FBG (SSFBG) in which a plurality of fiber Bragg grating (FBG) units of the same constitution and a plurality of phase modulation portions are alternately formed in the same optical fiber, wherein said temperature control plate is constituted by a thermo module and heat-insulating member; said base plate is fixed in contact with the upper face of said temperature control plate; said mounting plate is in contact with the upper face of said base plate in a state where said mounting plate is able to glide over the upper face of said base plate; said SSFBG is fixed to contact an FBG contact portion that is established on the upper face of said mounting plate; and said phase modulation portions are formed to be capable of expanding and contracting and, as a result of the expansion and contraction of said phase modulation portions, the phase of a carrier wave of an optical pulse signal that is propagated by said phase modulation portions can be changed.