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Fiber gratings for WDM devices

Fiber gratings have many applications in the telecommunications industry, especially in components for WDM systems. These include among others wavelength stabilizers for pump lasers, gain flatteners, add-drop modules, multiplexers, demultiplexers, dispersion compensators, ASE filters, Raman amplifiers and fiber laser sources. The many different applications require careful design and control of the fiber grating spectral response along with the use of different fabrication techniques. For the design and use of fiber gratings, consideration must be given to insertion losses, crosstalk, dispersion, temperature compensation, strength and long term reliability.