A Regenerative Prescaled Clock Recovery for High-Bit-Rate OTDM Systems

Abstract A regenerative prescaled clock recoverydevice based on an optoelectronic version of the Miller divider has been tested in high-bit-rate OTDM systems. Testsat 4 × 2.5 and 4 × 10 Gbit/s have been performed to characterize the locking range and the frequency response of the device. The timing jitter of the recovered signal in the case of the 4 × 10 Gbit/s OTDM system does not exceed 0.5 ps. Finally, a comparison of two bit-error-ratemeasurements (with and without the clock recoverysystem) were carried out for the 4 × 10 Gbit/s OTDM system. The relevant penalty for each channel is negligible, while the maximum received power difference among the four channels at a bit error ratevalue of 10 − 10 is around 0.7 dB.