Research On The Transmission Performance Of Optical Packet Signal Generated By Optical Carrier Suppression Modulation

The technology of optical singal processing has become the support of optical communication, and it will play a more important role in the all optical communication network in the future. The optical label switching of the packet transmission network has a great advantage at the network performance, quality of service and cost of network, ect. It is the most efficient and long-term way to solve the problems which are flexibility of network, capability of network and throughput rate. And all optical label signals processing is one of the key technology of optical labels switching. In this paper, label generation, label swapping and label transmission are researched by numerical simulation, theoretical analysis and experiment verification. The results obtained are as follows:1. We proposed a new scheme of the first-order carrier suppress optical label switching technology using phase modulator. Amplitude modulation has been employed in generating central optical carrier and other order carriers. 10Gb/s None-Return-Zero signal and 2.5Gb/s optical OFDM label has been generated.. The feasibility of the new scheme has been demonstrated by both simulation and experiment. The experimental results show that optical carrier suppression is easy to realize. Without power compensation, the OFDM signals can transmit long distance, and the received signals distortion and loss are both small under the same BER. It means the OFDM labels is more suitable for long distance transmission and it will play a important role in practical application in optical label switching network.2. We proposed a novel scheme with optical carrier suppression in optical label switching technology. 10Gb/s NRZ as payload and 2.5Gb/s OFDM signals as label are modulated on the subcarier respectively. The transmission of the optical group has been greatly improved due to the good overcoming of the multipath and chromatic dispersion and high frequency utilization.The feasibility of the new scheme has been demonstrated by simulation. The comparision of the eye diagrams of the label and payload is presented between the B-T-B and 60km SSMF system.This scheme is characteristic of simple structure, easy to realize and suitable for long distance transmission.