SYSTEMS, DEVICES, AND METHODS FOR MINIATURIZATION OF FIBER BRAGG GRATING INTERROGATION FOR INTEGRATION INTO IMPLANTABLE DEVICES

A miniaturized fiber Bragg grating (FBG) interrogation system may comprise a light source, a FBG sensor, and a photodetector. The FBG sensor may be configured to receive an optical signal from the light source, interact with a transmitted spectrum of the light source over a discriminating spectral domain, and generate a reflected optical signal representative of a change in a physical signal sensed by the FBG sensor. The discriminating spectral domain may be a region defined by at least one of the transmitted spectrum of the light source and a reflected spectrum of the FBG sensor. A width of the discriminating spectral domain may be based at least in part on a range of operation of the FBG sensor. In the discriminating domain region, a power of the reflected optical signal may change monotonically in response to a shift in the reflected spectrum of the FBG sensor. The photodetector may transform the reflected optical signal into an electrical signal. Additionally, the system may include a power management unit configured to reduce power consumption in order to prolong the lifespan of the system.