Thomsen Benn C, Maher Robert, Millar David S, Savory Seb J
Optical Networks Group, Department of Electronic and Electrical Engineering, UCL, Torrington Place, London, UK.
Opt Express. 2011 Dec 12;19(26):B770-6. doi: 10.1364/OE.19.00B770.
A burst mode 112 Gb/s DP-QPSK digital coherent optical receiver with parallel DSP suitable for implementation in a CMOS ASIC with a 218.75 MHz clock speed is presented. The receiver performance is validated in a five channel 50 GHz grid WDM burst switching experiment using a commercially available wavelength tunable laser as the local oscillator. A new equalizer initialization scheme that overcomes the degenerate convergence problem and ensures rapid convergence is introduced. We show that the performance of the tunable local oscillator is commensurate with burst mode coherent reception when differential decoding in employed and that required parallel DSP implementation does not seriously impair the polarization and frequency tracking performance of a digital coherent receiver under burst mode operation. We report a burst acquisition time of less than 200 ns.
本文介绍了一种适用于在时钟速度为218.75 MHz的CMOS ASIC中实现的具有并行数字信号处理（DSP）的突发模式112 Gb/s双偏振四相相移键控（DP-QPSK）数字相干光接收机。该接收机的性能在一个五通道50 GHz网格波分复用（WDM）突发交换实验中得到验证，该实验使用市售的波长可调谐激光器作为本地振荡器。引入了一种新的均衡器初始化方案，该方案克服了退化收敛问题并确保快速收敛。我们表明，当采用差分解码时，可调谐本地振荡器的性能与突发模式相干接收相当，并且所需的并行DSP实现不会严重损害突发模式操作下数字相干接收机的偏振和频率跟踪性能。我们报告的突发捕获时间小于200 ns。
