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https://www.atgrating.com/products/athermal-packaged-fbg.html

Athermal FBG is a method of compensating the temperature coefficient of fiber grating with a negative temperature coefficient packaging sleeve. It uses a material that does not have a negative temperature coefficient. The encapsulation sleeve can just fully compensate the wavelength drift caused by the temperature change of the FBG. The encapsulation results in a good temperature characteristic, in the environment of -5℃ to 70℃, the temperature coefficient of the fiber grating can reach 1pm/℃, and has good long-term temperature characteristic.

Features Of Athermal Fiber Bragg Grating
100G/50G Channel Spacing

Low Insertion Loss

Excellent Channel Isolation

Application Of Athermal Packaged Fiber Bragg Grating
Regional and Long Haul

Dwdm Networks

Wavelength Reference

Specification Of Athermal Packaged FBG

ParameterUnitValue
Center Wavelengthnm1460 ~ 1610
Bandwidth (FWHM)nm>0.2
Insertion LossdB<0.2
SLSRdB>15
PDLdB<0.1
Wavelength Shiftpm/°C<1 (-5°C ~ +70°C)
Fiber Type--Single-Mode
Fiber Coating--Acrylate
DimensionmmΦ5.5 x 64
Pigtail LengthmStandard 1m both ends, or custom
Optical Connector--Bare fiber, FC/APC, SC/APC, or custom
Storage Temperature°C-40 ~ +85

Based on FBG technology, FBG optical fiber products are widely used for testing and monitoring safety and health through the variation of particular wavelength of light, passive driving, long time stability, and sensibility, which can be applied to any harsh environment.