A study of regeneration and optical transmission in SONET/WDM rings and long haul networks.

摘要

Current work studies the problem of regeneration in SONET/WDM Rings with the objective to find regenerator placement scenarios to minimize the number of regenerators when different line rates are combined in UPSR and BLSR/2 architectures. The classes of rings are found that satisfy minimum hop condition, and for those classes we first prove the existence of lower and upper bounds for randomly positioned nodes in hubbed and all-to-all traffic cases, and show that the obtained bounds can be used for optimization purposes and also for “quick” quantitative estimates of regeneration cost. We then analyze the survivability profiles for both ring architectures. Although the protection switching mechanism is different for BLSR/2, the result shows that the survivability profile is identical to that of UPSR. Based on a developed Cayley set representation we address the non-uniform traffic problem and compare different traffic cases in terms of introduced network dimension ratio. We prove that it is the Cayley traffic patterns that minimize the regeneration cost with maximum bandwidth allocated to these set connections in the UPSR case. The advantage of NZDSF optical fiber over conventional single-mode fiber in the ring network is presented in terms of regeneration. The results of the effects attributed to the distortion in the optical multichannel systems is presented in this work where the main focus is on the fiber induced BER due to chromatic dispersion and fiber nonlinearities.