Abstract

We present the theory of Raman amplification in long multimode optical fibers, where strong random mode coupling within groups of quasi-degenerate modes is unavoidable. In such fibers, the signal components in modes that belong to the same strongly coupled group experience the same Raman amplification, where the differential gain is linearly dependent on the aggregate powers of the pump in each of the mode groups. The equations that we derive significantly facilitate the numerical and analytical study of Raman amplification in long multimode fibers.

© 2013 Optical Society of America

Cross mode modulation in multimode fibers

Dimitar I. Kroushkov, Georg Rademacher, and Klaus Petermann
Opt. Lett. 38(10) 1642-1644 (2013)

Amplification of higher-order modes by stimulated Raman scattering in H₂-filled hollow-core photonic crystal fiber

B. M. Trabold, A. Abdolvand, T. G. Euser, A. M. Walser, and P. St.J. Russell
Opt. Lett. 38(5) 600-602 (2013)

Coupled Manakov equations in multimode fibers with strongly coupled groups of modes

Antonio Mecozzi, Cristian Antonelli, and Mark Shtaif
Opt. Express 20(21) 23436-23441 (2012)

Random coupling between groups of degenerate fiber modes in mode multiplexed transmission

Cristian Antonelli, Antonio Mecozzi, Mark Shtaif, and Peter J. Winzer
Opt. Express 21(8) 9484-9490 (2013)

Polarization mode dispersion–induced fluctuations during Raman amplifications in optical fibers

Q. Lin and Govind P. Agrawal
Opt. Lett. 27(24) 2194-2196 (2002)