采用双波长注入一包含伪随机码发生器与相位调制器的光电振荡器可以同时得到非归零(NRZ)码,归零(RZ)码以及光,电时钟信号输出。该方案使用了光域耦合的双环路结构,在不增加有源器件的条件下实现边模抑制。相位调制器用于反馈调制并同时实现占空比可调的非归零码到归零码的转换。双波长的注入排除了编码信号在振荡器中引入的非时钟频率成分。实验给出了10 Gb/s工作速率下的结果,得到了抖动为637 fs的光信号输出。转换得到的归零码信号占空比约为33%。输出电时钟信号的相位噪声在频偏10 kHz处为-109 dBc/Hz,边模抑制比为58 dB。

Utilizing two-light-sources-injection optoelectronic oscillator, including generator and phase modulator, nonreturn-to-zero (NRZ), return-to-zero (RZ) signal and optical, electrical clock signal are generated simultaneously. In this configuration, a coupled dual-loop is formed in optical domain for suppressing the side modes in each loop without adding any active device. The phase modulator is employed to perform feedback modulation and data format conversion between NRZ and RZ with tunable duty ratio. Two lights work together for eliminating the unexpected frequency components introduced by optical coding signal. The experimental results at 10 Gb/s rate are demonstrated. The timing jitter of optical signal outputs is 637 fs and the duty ratio of converted RZ data is 33%. The electrical clock signal has high-quality spectrum at 10 GHz with a side mode suppression ratio of 58 dB, and a phase noise of -109 dBc/Hz at 10 kHz away from carrier.