为了研究高带宽利用率和大容量的光分组交换系统, 对载波抑制调制原理进行理论分析,提出了一种载波抑制调制光标签的方案, 并对基于载波抑制调制的光标签系统进行了仿真分析和实验研究。结果表明, 载波抑制光标签的中心载波抑制比达到21.3dB;在622Mbit/s和1.25Gbit/s的标签调制速率下, 系统传输距离超过40km时, 依然能保持低于10-10的误比特率;以误比特率10-10为标准, 在传输距离为40km时, 两种标签调制速率的功率代价分别为1.7dB和1.9dB。此结果说明载波抑制光标签在光分组交换系统中具有串扰小、功率代价低等特点, 信号质量好, 适合远距离传输。

In order to achieve optical packet switching system with high bandwidth utilization and large-capacity, based on theoretical analysis of carrier suppression principle, a scheme of optical label modulation was proposed. Simulation and experiment of the system were conducted. The results show that the center carrier suppression ratio of the carrier suppression light label is 21.3dB. Under label modulation rates of 622Mbit/s and 1.25Gbit/s, bit error rate (BER) of the system is lower than 10-10 when transmission distance is over 40km. In the standard of BER 10-10, power penalty of two label modulation rates is 1.7dB and 1.9dB when transmission distance is 40km. Carrier suppression light label in optical packet switching system has high extinction ratio and low power penalty, therefore it is suitable for long distance transmission.