CFBG	Chirped Fiber Bragg Grating
CWG	Cladding Waveguide
CWGMZI	Cladding Waveguide Mach–Zehnder Interferomer
DAS	Distributed Acoustic Sensing
DVS	Distributed Vibration Sensing
FBG	Fiber Bragg Grating
FLICE	Femtosecond Laser Irradiation followed by Chemical Etching
FPI	Fabry–Perot Interferometer
FSR	Free Spectral Range
GODC	Germanium Oxygen-vacancy Defect Center
KKr	Kramers–Konig relations
LbL	Line-by-Line
LIF	Lab-In-Fiber
LIRIC	Laser Induced Refractive Index Change
LOC	Lab-On-Chip
LPG	Long-Period Grating
MI	Michelson Interferometer
MZI	Mach–Zehnder Interferometer
NA	Numerical Aperture
NBOHC	Non-Bridging Oxygen Hole Center
OFS	Optical Fiber Sensor
OPD	Optical Path Difference
PbP	Point-by-Point
PCF	Photonic Crystal Fiber
PIC	Photonic Integrated Circuit
Pl-b-Pl	Plane-by-Plane
PDL	Polarization Dependent Loss
POF	Polymer Optical Fiber
PRR	Pulse Repetition Rate
QPM	Quantitative Phase Microscopy
RI	Refractive Index
RIC	Refractive Index Change
RIU	Refractive Index Unit
RNF	Refracted Near Field
SEM	Scanning Electron Microscope
SMF	Single Mode Fiber
SRI	Surrounding Refractive Index
TFBG	Tilted Fiber Bragg Grating
TOF	Tapered Optical Fiber
WBG	Waveguide Bragg Grating
WGM	Whispering Gallery Mode