Title :
Cross modulation of pump-signals in distributed Raman amplifiers, theory and experiment
Author :
Song, Kai ; Dods, Sarah D.
Author_Institution :
Dept. of Electr. & Electron. Eng., Melbourne Univ., Parkville, Vic., Australia
Abstract :
Cross modulation of the pump and signal in a backward pumped distributed Raman amplifier (DRA) is investigated theoretically and experimentally. An analytical theory describing the frequency response of cross modulation in a DRA with pump perturbation is developed for the first time. The corner frequency of this response is simply determined by the walkoff parameter of the two counterpropagation lights and the loss coefficient of the Raman fiber. This theory was confirmed by the agreement of theoretical results and experimental measurements.
Keywords :
Raman lasers; frequency response; laser theory; optical communication equipment; optical fibre amplifiers; optical fibre losses; optical modulation; optical pumping; Raman fiber; analytical theory; backward pumped distributed Raman fibre amplifier; corner frequency; counterpropagation lights; cross modulation; distributed Raman amplifiers; frequency response; loss coefficient; pump perturbation; pump-signals; walkoff parameter; Distributed amplifiers; Equations; Frequency; Optical amplifiers; Optical fiber polarization; Optical fibers; Optical noise; Photonics; Signal to noise ratio; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
