Long Period Fiber Grating

Long period fiber bragg grating (LPFG) is formed by the periodic refractive index modulation in the fiber axis, and its period is generally larger than 100µm. Its coupling mechanism is: the fundamental mode of the fiber core transmitted forward is coupled into the cladding mode of the forward transmission of several specific wavelengths, and the cladding mode is quickly lost, so the LPFG basically has no retroreflection, and in its transmission there are several absorption peaks at specific wavelengths in the spectrum.

Features Of long period fiber grating
No Reflection Type

Low Insertion Loss

Application Of long period grating
Notch Band Filter

GFF for EDFA

Optical Fiber Sensing

Specification Of Long grating period
Parameter Unit Value
Center Wavelength nm C+L
Transmission Loss % >90
Bandwidth (FWHM) nm 1~3
Period μm 550
LPFG Length mm 20~30
Tensile Strength kpsi >100
Fiber Type -- Single-Mode
Fiber Coating -- Acrylate
Pigtail Length m Standard 1m both ends, or custom
Optical Connector -- Bare Fiber, FC/APC, SC/APC, or custom

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