CHIRPED PERIOD GRATINGS FOR RAMAN AMPLIFICATION IN CIRCULATOR LOOP CAVITIES

摘要

The present invention provides a structure for Raman amplification of signals with counter-propagation of signal (s) and pump (p) and wavelength control while permitting broad bandwidth within each Raman order. The broadband optical amplifier of the invention combines Raman amplification with a circulator loop cavity (10, 20) and/or chirped Bragg gratings (70) to achieve bandwidth performance improvements. The beneficial properties of the circulator loop cavity (10, 20) and/or chirped Bragg gratings (70) can also be combined with noise dampening property of the Sagnac Raman cavity.