Home > Fiber Bragg Grating – New Technology in Optical Fiber and Semiconductor Lasers

Fiber Bragg Grating – New Technology in Optical Fiber and Semiconductor Lasers

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article image Optical Fiber Technology

Applied Infrared Sensing  specialises in active infrared and thermal imaging technologies for application in diverse environments.  

The invention of optical fiber and semiconductor lasers in the 1960s opened new applications in communications and sensing.  

Optical fibers provide a fundamental improvement over traditional methods offering lower loss, higher bandwidth, immunity to electromagnetic interference, lighter weight, lower cost and lesser maintenance.  

By applying a UV laser to burn or write a diffraction grating (a Fiber Bragg Grating or FBG) in the fiber, it became possible to reflect a certain wavelength of light, which used together with an interrogation analyzer, could take precise sensing measurements.  

This technology is widely used for Dense Wavelength Division Multiplexing (DWDM) applications, for real-time fault detection and embedded monitoring of smart structures.  

Applied Infrared Sensing launches new Fiber Bragg Grating Analyzers (FBGA) from BaySpec (USA).  

These FBG analyzers employ a highly efficient Volume Phase Grating VPG as the spectral dispersion element and an ultra sensitive InGaAs array detector as the detection element, providing high-speed parallel processing and continuous spectrum measurements.  

As an input, the device uses a tapped signal from the main data transmission link through a single mode fiber, collimating it with a micro lens. The signal is spectrally dispersed with the VPG, and the diffracted field is focused onto an InGaAs array detector.  

The control electronics read out the processed digital signal to extract the required information. Both the raw data and the processed data are available to the host.  

FBG analyzers are available in two versions: a standard high speed FBG analyzer and an infrared FBG analyzer.  

Both FBG analyzers represent integrated spectral engines with an internal reference source that interrogates multiple wavelengths for precise Fiber Bragg Grating (FBG) sensor system measurements requiring high end-of-life wavelength accuracy at high frequency response time.  

The devices cover wide wavelength ranges and provide simultaneous measurements at very fast response rates and excellent wavelength resolution.

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