For both forward- and backward-pumped Raman amplifiers, devices to perform gain-spectrum self-control of multi-laser pumps are depicted in this paper. The algorithm supporting the devices is presented also. The function of automatic control is suitable for on-line maintenance of WDM equipment.
Key techniques in practical Tbps WDM optical transmission equipments are summarized in this talk, regarding optical transmission issues and the relative engineering solutions in the wide spectrum range and long distances, for example, the issues and solutions of Raman amplification and enhanced forward error correction. Moreover, new challenges in the manufacturing of this equipment include the controlling and managing aspects, to meet the practical requirements of Tbps WDM transmission. New devices and systems should be highly automatic, to ensure characteristics of automatic auxiliary maintenance or adjusting. Hence, intelligence solutions of spectral controlling, bit error rate optimizing, security ensuring, protection switching etc. are also referred in this talk. These are new characteristics of commercial Tbps WDM equipments in the future.
Dispersion Compensation has to be performed when 32x10Gbs long haul signals transmission in G.652 fiber. Optimum system transmission performance depends on the amount and distribution of dispersion compensation, laser performance and the nonlinear effects of fiber transmission, etc. System performance calculation under dispersion compensation is given, and system performance influenced by various factors under complete and residual compensation conditions is analyzed in this paper, with 6x22dB as an example.