Long Period Fiber Grating (LPFG)
Description
Long Period Fiber 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.
Long Period Fiber Grating (LPFG)
Specifications |
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|---|---|
| Center Wavelength Range: | 1530-1625nm |
| FBG Length: | >25 mm, 25 mm, 20 mm |
| Reflectivity: | Not Specified |
| Transmission Loss: | >90 % |
| Bandwidth (FWHM): | 1~3 nm |
| Period: | 550 um |
| FBG Recoating: | None |
| Tensile Strength: | >100 kpsi |
| Fiber Type: | SMF-28e or Compatible |
| Pigtail Length: | 1 (Typical), or Custom m |
| Optical Connector: | Bare Fiber, FC/APC, SC/APC, or Custom |
Features
- No reflection type
- Low insertion loss
Applications
- Notch band filter
- GFF for EDFA
- Optical fiber sensing
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How to order?
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Ships from:
China
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Sold by:
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On FindLight:
since 2022
Frequently Asked Questions
A Long Period Fiber Grating (LPFG) is formed by the periodic refractive index modulation in the fiber axis, with a period generally larger than 100µm.
The coupling mechanism of LPFG is that the fundamental mode of the fiber core transmitted forward is coupled into the cladding mode of the forward transmission of several specific wavelengths, resulting in no retroreflection.
The features of LPFG include being a no reflection type and having low insertion loss.
LPFG can be used as a notch band filter, GFF for EDFA (Erbium-Doped Fiber Amplifier), and for optical fiber sensing.
The specifications of LPFG include a center wavelength in the C+L band, transmission loss of over 90%, FWHM (Full Width at Half Maximum) of 1-3 nm, period of 550 µm, LPFG length of 20-30 mm, and compatibility with SMF-28e or compatible fiber types.