Wang Qiang, Huo Li, Xing Yanfei, Lou Caiyun, Zhou Bingkun
Opt Express. 2013 Dec 2;21(24):30000-6. doi: 10.1364/OE.21.030000.
We propose and demonstrate a novel scheme for clock recovery and simultaneous fourfold optical time-division demultiplexing using a dual-parallel Mach-Zehnder modulator based optoelectronic oscillator. 25-GHz prescaled optical clock with a 23% duty cycle and a 22-dB extinction ratio is successfully extracted from both 100-Gb/s on-off keying (OOK) and differential phase-shift keying (DPSK) optical time-division-multiplexing (OTDM) signal. The timing jitters (100 Hz to 10 MHz) are measured to be 195.9 fs and 125.6 fs for the optical clock extracted from the 100-Gb/s OOK and DPSK signal, respectively. Error-free optical time-division demultiplexing is also achieved simultaneously with clock recovery. By adjusting the phase shifter in the OEO loop, all four channels can be selectively demultiplexed. The power penalties at a bit error rate (BER) of 10⁻⁹ for the four demultiplexed channels are measured to be between 0.8 dB and 1.2 dB for the OOK signal and between 0.9 dB and 1.5 dB for the DPSK signal.
我们提出并演示了一种新颖的方案，该方案利用基于双并行马赫-曾德尔调制器的光电振荡器进行时钟恢复和同时四倍光时分多路分解。从100Gb/s开关键控（OOK）和差分相移键控（DPSK）光时分复用（OTDM）信号中成功提取了占空比为23%、消光比为22dB的25GHz预分频光时钟。从100Gb/s OOK和DPSK信号中提取的光时钟的定时抖动（100Hz至10MHz）分别测量为195.9fs和125.6fs。在进行时钟恢复的同时，还实现了无误码光时分多路分解。通过调整光电振荡器（OEO）环路中的移相器，可以选择性地对所有四个通道进行多路分解。对于OOK信号，四个解复用通道在误码率（BER）为10⁻⁹时的功率代价测量值在0.8dB至1.2dB之间，对于DPSK信号，功率代价测量值在0.9dB至1.5dB之间。
