Abstract: A system and method are presented for detecting and measuring pressure within a region of a body lumen or vessel. The pressure sensing system includes a light source for transmitting light through a pathway of fiber optic wire. A distal portion of the fiber optic wire is engaged to and extends along a guidewire. The distal portion of the fiber optic wire includes sensor station(s) made up of fiber Bragg gratings (FBG). The light transmitted to and reflected from the FBGs of the pressure sensing stations can be analyzed to provide one or more values.

Abstract: A fiber Bragg grating interrogator assembly is described. Examples of the fiber Bragg grating interrogator assembly include an optical fiber including a fiber Bragg grating having a variable Bragg wavelength (?B) and a dynamic range of interest (??dyn,B) over which the Bragg wavelength (?B) can shift during use. The fiber Bragg grating interrogator assembly also includes a response analyzer having a spectrally selective device with an input port to which the optical fiber is operably connected, and a plurality of output ports of which each output port is associated with a respective spectral range (??n). The spectral ranges (??n, ??n+1, ??n+2) of each at least three successive output ports partially overlap, such that the FBG's Bragg wavelength (?B) falls inside the spectral ranges (??n, ??n+1, ??n+2) of at least three successive output ports over the dynamic range of interest (??dyn,B) of the FBG.

Abstract: A fiber Bragg grating interrogator assembly is described. Examples of the fiber Bragg grating interrogator assembly include an optical fiber including a fiber Bragg grating having a variable Bragg wavelength (?B) and a dynamic range of interest (??dyn,B) over which the Bragg wavelength (?B) can shift during use. The fiber Bragg grating interrogator assembly also includes a response analyzer having a spectrally selective device with an input port to which the optical fiber is operably connected, and a plurality of output ports of which each output port is associated with a respective spectral range (??n). The spectral ranges (??n, ??n+1, ??n+2) of each at least three successive output ports partially overlap, such that the FBG's Bragg wavelength (?B) falls inside the spectral ranges (??n, ??n+1, ??+2) of at least three successive output ports over the dynamic range of interest (??dyn,B) of the FBG.