Long Period Fiber Grating (LPFG)
Description
The Long Period Fiber Grating (LPFG) from AtGrating is an advanced optical component designed to enable selective attenuation of specific wavelengths in the transmission spectrum. Unlike traditional Fiber Bragg Gratings, LPFGs are non-reflective devices with periodic refractive index modulation along the fiber axis, typically with periods larger than 100 μm. This configuration allows the core mode to couple into cladding modes at selected wavelengths, which then dissipate, creating distinct absorption peaks in the transmitted signal.
LPFGs are ideal for applications that demand high spectral selectivity with low insertion loss, making them well-suited for use as notch filters, gain flattening filters (GFFs) in Erbium-Doped Fiber Amplifiers (EDFAs), and in optical fiber sensing for environmental or structural monitoring. The standard LPFG configuration features high mechanical strength, compatibility with SMF-28e fiber, and flexible pigtail and connector options.
With its robust design and customizable configuration, the LPFG delivers reliable performance in both laboratory and field environments, especially in C+L wavelength bands.
Long Period Fiber Grating (LPFG)
Specifications |
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|---|---|
| Center Wavelength Range: | 1530 – 1625 nm |
| 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 |
| LPG Length: | 20–30 mm |
| Recoating Option: | None |
| Pigtail Length: | 1 (Typical), or Custom m |
| Optical Connector: | Bare Fiber, FC/APC, SC/APC, or Custom |
| Full Width At Half Maximum (FWHM): | 1–3 nm |
Features
- Non-Reflective Design: Absorbs selected wavelengths without back-reflection
- Low Insertion Loss: Maintains signal integrity with minimal attenuation
- Distinct Absorption Peaks: Enables precise spectral filtering at target wavelengths
- Robust Mechanical Strength: Tensile strength >100 kpsi ensures durability
- Flexible Integration: Compatible with standard SMF-28e fiber and connector types
Applications
- Notch Band Filtering: Eliminates unwanted wavelengths in optical systems
- EDFA Gain Flattening Filters (GFFs): Equalizes amplification profiles in fiber amplifiers
- Optical Fiber Sensing: Detects environmental changes via wavelength shifts
- Wavelength-Selective Filtering: Supports advanced signal processing in DWDM systems
For pricing, technical or any other questions please contact the supplier
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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.