By R. H. Stolen (auth.), D. B. Ostrowsky, E. Spitz (eds.)
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Lett. 23, 147 (1973). 15. E. B. Phys. Teor. Fiz. ~, 118 (1971». 16. F. H. P. Lett. 45, 1095 (1980). 17. H. Nakatsuka, D. C. Lett. 47, 910 (1981). 18. B. Crosignani and P. lett. ~, 329 (1981). 19. A. ~, 416 (1980). 41 20. B. Crosignani and P. Lett. Z, 489 (1982). J. AuYeung, D. M. Pepper, and A. Quantum Electron. QE-15, 1180 (1979). E. Epworth, in Proceedings of the 4th European Conference on Optical Communications, Genoa (Sept. 1978). :::3. B. Crosignani, B. Daino, and P. Di Porto, "Interference of mode patterns in optical fibers", Opt.
46,4921 (1975). T. Roma, Italy 1 INTRODUCTION The long interaction length between radiation and material medium provided, thanks to their guidance capacity and low attenua_ tion, by optical fibers has furnished the opportunity of investiga_ ting nonlinear optical processes in glass at relatively low input powers (1). This study has in turn led either to realize the possi_ bility of taking advantage of some of these effects for increasing the fiber capability of carrying information or the necessity of avoiding some of them because of a negative influence on fiber tran_ smission.
10 The induced index changes ~n are very smail (of the order of 10 in single mode fibers at I-Watt power levels), but the long fiber lengths L make their effect on the phase of the light significant. The induced phase change ~~ is M = 2n ~n L/"A The induced ~~ changes in time with the pulse intensity. leads to a frequency chirp Ow given by Ow = - This d(~~)/dt and thus to a broadening of the pulse spectrum. 86 ~w~~ (18) max where ~~ is the phase shift induced at the peak of the pulse. 2 x 10- 2 "AA Watts L 2 where A is the effective fiber core area measured in ~m.
