A novel clock extraction circuit using a new NRZ-to-PRZ converter and a dielectric resonator filter for 10 Gbit/s optical receiver

We report a novel clock recovery circuit for 10Gbit/s lightwave transmission systems, which consists of a new NRZ-to-Pseudo-RZ converter for the generation of a clock signal from NRZ data. The new NRZ-to-PRZ converter generates both the differentiated and the phase-inverted differentiated signal of NRZ data and rectifies them, resulting in a discrete clock signal. The power of the clock signal obtained from a 1 V/sub p.p/2/sup 31/-1 PRBS input data is -21 dBm, which is 90 dB above the noise spectral density at the clock frequency. The timing jitter of the clock signal extracted with a DR filter of the Q-value 800 is estimated to be 1.2 ps.<>