Abstract:
Signal distortion due to the accumulated dispersion in long light paths in all optical fiber networks is one of a serious source that limits the network performance. This thesis first time introduces an optimal algorithm for efficient deployment the dispersion compensation unit (DCU) in transparent wavelength-division multiplexed (WDM) wavelength-routed network in order to compensate for the accumulated fiber dispersion. Our proposed algorithm can be applied for both non-slope-compensated (NS-DCU) and slope-compensated DCUs (SC-DCU), in both normally operated network and network where a link failure is protected by the span protection algorithm. We also describe the existence of a limitation when only SC-DCUs are employed. To overcome this limitation, we propose the use of the optimal combination of SC-DCUs and NS-DCUs whose numbers of DCU can be determined by solving a mixed integer linear programing (MILP) problem. By demonstrating our method, we assign the group of 72 wavelengths with the channel spacing 0.8 nm in C band using on a part of Optical Pan European Network which consist of 10 nodes, 13 links with total length of 1882 km. For the employment of the NS-DCUs, the number of wavelength that can be used in the network may be restrained by the over (or under) compensation. On the other hand, 46 NS-DCUs are necessary, however; with the number of wavelength only a part of C-band. We obtained equivalent number of 44 DCUs for only SC-DCU in normally operated network. Beside, we found that only 72 SC-DCUs or the combination of 36 SC-DCUs and 7 NS-DCUs are necessary for installing in the protection fiber. We also simulate the longest transmission on OptiSys 8.0, it shows that the quality of the signal which arrive at the receiver within the dispersion limit is still excellent.