Matching intrapulse self-frequency shift to sliding-frequency filters for transmission of narrow solitons

Abstract

Sliding-frequency filters are a standard means of suppressing the Gordon–Haus jitter in long-haul soliton transmission. For narrow solitons, the frequency sliding can be naturally provided by the Raman effect. The passbands of the sliding-frequency filters can then stay closer to the soliton’s central frequency, thereby reducing filter losses, which in turn reduces the necessary compensatory gain and, consequently, the timing jitter. We analyze the dynamics of solitons in a system with sliding-frequency filters, Raman-induced self-frequency downshift, losses, periodic amplification, and third-order dispersion. An optimum mode of operation, based on an analytic approximation, is found and checked against numerical simulations.