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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。
Using dual wavelength injection of a photoelectric oscillator containing a pseudo-random code generator and a phase modulator, a non-return to zero (NRZ) code, zero return (RZ) code, and optical and electrical clock signals can be simultaneously output. The scheme uses a light-domain coupled dual-loop structure to achieve side mode suppression without adding active components. The phase modulator is used to feed back the modulation and at the same time realize the conversion of non-return to zero return with adjustable duty cycle. Dual-wavelength injection eliminates the non-clocking frequency components introduced into the oscillator by the encoded signal. The experiment results are given at 10 Gb / s operating speed, and the optical signal output with 637 fs is obtained. The converted zero-return signal has a duty cycle of about 33%. The phase noise of the output electrical clock signal is -109 dBc / Hz at a frequency offset of 10 kHz and the side mode rejection ratio is 58 dB.