Quasi-phase-matched modulation instability in periodically birefringent fibers

Summary form only given. In the normal dispersion regime, two forms of modulation instability have been observed when birefringent single-mode fibers are subjected to intense pump pulses. These instabilities are the cross phase or XPMI process and the coherent or PMI process. In this paper we report here a simple method for varying the frequency of the induced PMI modulation, by using a winding geometry in which the birefringence of the fiber varies periodically along the fiber.