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https://www.atgrating.com/products/chirped-fbg.html

The grating period of Chirped FBG is not constant, but varies along the axial direction. Different grating periods correspond to different Bragg reflection wavelengths, and incident light of different wavelengths is reflected at different positions of the chirped fiber grating, so that the light of different wavelengths will produce an optical path difference after being reflected by the chirped fiber grating. Using this effect of chirped fiber grating, the dispersion compensation of different wavelength signals in long-distance fiber communication can be effectively realized.

Features Of china chirped fiber bragg grating
Wide Bandwidth
Low Insertion Loss
High Reflectivity

Application Of chirped grating
Gain Flattening Filter
Dispersion Compensation
FTTH
CWDM System
ASE filtering, noise suppression
WDM 1300/1550nm band rejection filter

Specifications Of Chirped FBG
ParameterUnitValue
Center Wavelengthnm1064, 1530, 1550, 1575, 1590, 1625, 1650
Wavelength Tolerancenm+/-0.25
Reflectivity%10~99
Bandwidth (FWHM)nm10 (1-15)
SLSRdB>10
Insertion LossdB<0.5
FBG Recoating--None, Acrylate, Polyimide, or custom
Tensile Strengthkpsi>100
Fiber Type--Single-Mode
Fiber Coating--Acrylate, Polyimide, or custom
Pigtail LengthmStandard 1m both ends, or custom
Optical Connector--Bare Fiber, FC/APC, SC/APC, or custom
Or you can buy fbg sensor.