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Theory of signal light amplification by stimulated Raman scattering in twisted single-mode optical fibers

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3 Author(s)
Seikai, Shigeyuki ; NTT Public Corporation, Tokai, Ibaraki-ken, Japan ; Nakashima, Takashi ; Shibata, N.

Characteristics of signal light amplification by stimulated Raman scattering are studied theoretically for the twisted single-mode fibers. Coupling equations for orthogonal modes in the fiber are derived and solved analytically. The optical gain dependence on fiber twist rate, fiber length, and so on are numerically investigated. The Raman gain for the twisted fiber with a rate of 1 turn/m is found to be reduced by 10 dB comparing with the nontwisted fiber for the fiber length less than 2 km, while it is almost independent of twist rate for the fiber longer than 10 km.

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Lightwave Technology, Journal of  (Volume:4 ,  Issue: 6 )