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Fiber Bragg Grating Sensors

Since 2010 we have pioneered the femtosecond laser point-by-point inscription of fiber Bragg gratings and other innovative sub-micron structures within optical fibers. Learn more about our technology.

Innovative Technology

Advantages of FBG Sensing

Compared to their electrical counterparts, sensors within optical fibers have fundamental advantages like totally electromagnetic immunity. Most importantly, one can interrogate lots of sensors within a single optical fiber at arbitrary locations along both great and minimal distances, besides of being as thin as a human hair, weighing next to nothing, and running robustly at high temperatures or even in highly corrosive and high radiation environments.

  • Up to 30 sensors in one single fiber
  • Ultrathin and lightweight
  • Electromagnetic immune
  • Safe in explosive and high radiation environments

Shaping Spectra at Nanoscale

FiSens has invented the most simplified high-resolution fiber optic spectrometer one can imagine. Essentially, all optical components of a spectrometer are directly embedded into the core of an optical fiber. This novel optical embodiment is protected by an international patent family, including, but not limited to: US 10962415 B2, US 11698302 B2, EP 3586177 B1, EP 3879316 B1, JP 7042285 B2, CN 110300907 B, and KR 102550942 B1.

Automatic & Precise

Direct Writing through Coating and Cladding

Based on our proprietary developed femtosecond laser processing technology we produce fiber Bragg gratings (FBGs) fully automatic point by point. We directly inscribe the FBGs into the core of the fiber without any interference with the surrounding cladding and coating.

Our manufacturing process has an exceptional geometrical precision of less than 20nm along the entire FBG structure. Moreover any inscribed modulation of the refractive index of the glass core is spectrally documented via an inline-quality inspection control.

Perfectly Tailored Sensors

Customization of FBG arrays

Without any additional production steps like decoating or splicing we are able to offer FBGs at arbitrary positions along the fiber. Whether 24 or up to a 1000 FBGs packed tightly within minimal adjacent distances of only 1mm or distributed along the fiber with greater distances of several meters, we can produce it for you.

Due to our direct writing fs-laser process we are able to produce FBGs in almost any optical fiber available on the market having coatings like acrylate, polyimide or even carbon polyimide or within specialty fibers like pure silica core, bend-insensitive or radiation resistant fibers.