Polarized Backward Raman Amplification in Unidirectionally Spun Fibers

• Published in: IEEE photonics technology letters Vol. 20; no. 1; pp. 27 - 29
• Main Authors: Bettini, E., Galtarossa, A., Palmieri, L., Santagiustina, M., Schenato, L., Ursini, L.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-01-2008; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Amplification; Birefringence; Equivalence; Fibers; Gain; Mathematical analysis; Mathematical models; Nonlinear equations; Optical amplifiers; Optical fiber communication; Optical fiber devices; Optical fiber polarization; Optical fibers; Polarization-mode dispersion (PMD); Raman amplification; Spinning; spun fibers; Stimulated emission; US Department of Transportation
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2007.911517

The vector interaction of an intense, backward-propagating, Raman pump and a weak, forward-propagating, Stokes signal in randomly birefringent, unidirectionally spun fibers is theoretically and numerically studied. The governing equations account for losses, Raman interaction, random linear birefringence, nonlinearity, and spinning. A model of birefringence, previously proposed for determining the polarization properties of unidirectionally spun fibers, is applied to the Raman amplifier confirming that this particular spin generates an equivalent circular birefringence. Numerical solutions show that, for rapid spinning, random birefringence effects are greatly reduced, Raman gain can be enhanced, and its fluctuations are minimized.