Ultrahigh-speed long-distance TDM and WDM soliton transmissiontechnologies

摘要

Recent progress on time-division multiplexed (TDM) andnwavelength-division multiplexed (WDM) soliton transmission is described,nin which dispersion management (DM) plays an important role innincreasing the power margin and the dispersion tolerance. Thencharacteristics of the DM soliton are compared with those ofnreturn-to-zero (RZ) and nonreturn-to-zero (NRZ) pulses. With a smallndispersion swing, the system can still be described as an averagensoliton with a nonlinear Schrodinger equation (NLSE), whereas with anlarge dispersion swing, the soliton-like steady-state pulse becomes anchirped Gaussian pulse, in which the master equation is closer to anlinear Schrodinger equation (LSE) with a parabolic potential well. Annin-line modulation scheme up to 80 Gb/s per channel and its two-channelnWDM transmission over 10000 km are described. A 640-Gb/s (40nGb/s×16 channels) WDM soliton transmission over 1000 km is alsonreported with a DM single-mode fiber, without the use of in-linenmodulation. Finally, dark soliton transmission at 10 Gb/s over 1000 kmnis described as a different nonlinear pulse application