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.