Optical channel pre-emphasis equalization is experimentally researched for a 270 km 40 × 40 Gbit/s wavelength division multiplexing （WDM） transmission system with three Erbium-doped fiber amplifiers （ED- FAs）...Optical channel pre-emphasis equalization is experimentally researched for a 270 km 40 × 40 Gbit/s wavelength division multiplexing （WDM） transmission system with three Erbium-doped fiber amplifiers （ED- FAs） and Raman amplifiers concatenated as booster amplifier. The channel imbalance of the overall system changes with different sets of power launched into EDFAs. By appropriately choosing the power input to concatenated EDFAs, the output spectrum of 40 channel signal can be equalized to the most extent. The merit of benefit can be around 5.5 dB by this pre-emphasis equalization. The requirement for the gain equalizer is therefore greatly released. Then the gain imbalance of the overall system and the power imbalance of 40 channels are compared and the two almost matches, but the significant difference lies on some channels. Finally, the pump power into Raman amplifier is also optimized, and another 1.3 dB improvement of channel equaliza- tion can be further achieved.展开更多
随着光纤通信技术的突飞猛进和广大用户的宽带视频业务需求日益增长,电信运营商通过大力推广光纤到户(Fibre To The Home,FTTH)接入网拓展高速宽带和交互式网络电视(Internet Protocol Television,IPTV)业务,对广电网络造成了极大的冲...随着光纤通信技术的突飞猛进和广大用户的宽带视频业务需求日益增长,电信运营商通过大力推广光纤到户(Fibre To The Home,FTTH)接入网拓展高速宽带和交互式网络电视(Internet Protocol Television,IPTV)业务,对广电网络造成了极大的冲击。为了应对这个局面,近几年广电运营商在接入网建设领域一方面保留传统的数字视频广播(Digital Video Broadcast,DVB)网络,另一方面全力建设FTTH,力求实现与电信运营商全面的、差异化竞争。基于此,介绍广电FTTH网络的系统架构、组网方案以及网络设计要点,供广电网络从业人员参考。展开更多
基金the National Natural Science Foundation of China (60777024)
文摘Optical channel pre-emphasis equalization is experimentally researched for a 270 km 40 × 40 Gbit/s wavelength division multiplexing （WDM） transmission system with three Erbium-doped fiber amplifiers （ED- FAs） and Raman amplifiers concatenated as booster amplifier. The channel imbalance of the overall system changes with different sets of power launched into EDFAs. By appropriately choosing the power input to concatenated EDFAs, the output spectrum of 40 channel signal can be equalized to the most extent. The merit of benefit can be around 5.5 dB by this pre-emphasis equalization. The requirement for the gain equalizer is therefore greatly released. Then the gain imbalance of the overall system and the power imbalance of 40 channels are compared and the two almost matches, but the significant difference lies on some channels. Finally, the pump power into Raman amplifier is also optimized, and another 1.3 dB improvement of channel equaliza- tion can be further achieved.
文摘随着光纤通信技术的突飞猛进和广大用户的宽带视频业务需求日益增长,电信运营商通过大力推广光纤到户(Fibre To The Home,FTTH)接入网拓展高速宽带和交互式网络电视(Internet Protocol Television,IPTV)业务,对广电网络造成了极大的冲击。为了应对这个局面,近几年广电运营商在接入网建设领域一方面保留传统的数字视频广播(Digital Video Broadcast,DVB)网络,另一方面全力建设FTTH,力求实现与电信运营商全面的、差异化竞争。基于此,介绍广电FTTH网络的系统架构、组网方案以及网络设计要点,供广电网络从业人员参考。
