fiber Bragg grating


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fiber Bragg grating

A short length of optical fiber that filters out a particular wavelength. Periodically spaced zones in the fiber core are altered to have different refractive indexes slightly higher than the core. This structure selectively reflects a very narrow range of wavelengths while transmitting others. Fiber Bragg gratings are used to stabilize the output of a laser and to filter out wavelengths in a WDM system.

The name comes from Bragg's Law, which is used to create the spacing of the changes. Sir William Lawrence Bragg, noted British physicist (1890-1971) discovered this in his study of x-rays and crystal structures. See diffraction grating and WDM.


A Fiber Bragg Grating
Fiber Bragg gratings such as this one from JDS Uniphase can be customized for a variety of applications covering a range of wavelength bands from 850 to 1650 nm. (Image courtesy of JDS Uniphase.)







The Gratings Reflect
In this example, the red wavelength matches the grating period and is reflected. The blue wavelength is transmitted because it does not match the grating spacings. (Illustration assistance courtesy of Jeff Hecht.)







Optical Circulators
Since the desired wavelength is reflected back by the grating, another device known as an "optical circulator" detects and switches it. (Illustration courtesy of Jeff Hecht.)
References in periodicals archive ?
Okabe, High-sensitivity ultrasonic phase-shifted fiber Bragg grating balanced sensing system, Opt.
i] to allow either the fiber Bragg grating FBGti_1 or the fiber Bragg grating FBGti_2 to connect to the 2 x 1 optical switches.
In this work, we have designed a new passive optical network using an array of fiber Bragg gratings for centralized monitoring of a branched optical networks.
We mention a related work in [10] where it is shown that nonlinearity in a fiber Bragg grating can lead to pulse splitting in the reflected waves.
When the dispersion affected input pulse with width t passes through the Chirped fiber Bragg grating, pulse width is decreased by [dalta][tau] and its shape is restored on the output.
He, "Multiple fiber Bragg grating interrogation based on a spectrum-limited Fourier domain mode locking fiber laser," Opt.
The main advantage found due to complicated refractive index profile in the fiber Bragg grating is to reduce the nonlinear phase shift during pulse propagation; hence the optical power level can be significantly increased without much worrying about the nonlinear optical effects.
y otros 6 autores; Thermal treatment of fiber Bragg gratings recorded using high power lasers, J.
Proximion Fiber Systems AB is a world-class provider of optical modules and sub-systems based on Fiber Bragg Grating (FBG) technology.
mounting device which enables anybody to fix Fiber Bragg Grating strain sensors easily on every resistance welding machine.