DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
Opt Lett. 2011 May 1;36(9):1560-2. doi: 10.1364/OL.36.001560.
We propose and demonstrate the use of a single semiconductor optical amplifier (SOA) and optical filtering to time demultiplex tributaries from an optical time division multiplexing-differential phase shift keying (OTDM-DPSK) signal. The scheme takes advantage of the fact that phase variations added to the target channel by cross-phase modulation from the control signal are effectively subtracted in the differential demodulation scheme employed for DPSK signals. Demultiplexing from 80 to 40 Gbit/s is demonstrated with moderate power penalty using an SOA with recovery time twice as long as the bit period at 80 Gbit/s. Large dynamic ranges for the input power and SOA current are experimentally demonstrated. The scheme is expected to be scalable toward higher bit rates.
我们提出并演示了使用单个半导体光放大器 (SOA) 和光滤波来对光时分复用-差分相移键控 (OTDM-DPSK) 信号的支路进行时分解复用。该方案利用了这样一个事实，即通过控制信号的交叉相位调制向目标信道添加的相位变化在用于 DPSK 信号的差分解调方案中被有效抵消。使用恢复时间是 80Gbit/s 比特周期两倍的 SOA，在中等功率代价下演示了从 80Gbit/s 到 40Gbit/s 的解复用。实验证明了输入功率和 SOA 电流的大动态范围。该方案有望扩展到更高的比特率。
