TUNABLE FIBER BRAGG GRATINGS AND WAVELENGTH-LOCKED LOOPS FOR DISPERSION COMPENSATION

摘要

A system and method for precisely controlling the wavelength selective function provided by fiber Bragg gratings in optical fiber elements. The system and method exploits a wavelength-locked loop servo-control circuit and methodology that enables real time adjustment of the grating pattern being written to said fiber optical link element by a grating writing source to thereby mutually align a center wavelength of the peaked wavelength selective function resulting from the grating pattern with a center wavelength of the optical signal transmitted over a communication channel provided by the fiber. A real-time adaptive dispersion compensation technique for optical fibers is additionally provided that exploits the wavelength-locked loop servo-control circuit. In the adaptive compensation system, a tunable Bragg grating pattern is re-written to the fiber optical link element by a grating writing source under control of the wavelength-locked loop servo-control circuit in order to mutually align a center wavelength of the peaked wavelength selective function resulting from the grating pattern with a center wavelength of an optical signal to be transmitted over the channel.