Abstract
Clock signal extrtaction from 40-Gbit/s signals based on injection loocking is demonstrated. The loop frequency is 20 GHz, which enables efficient frequency down conversion and system cost down. Basic characteristics of locking range, phase noise, and frequency response of the system are clarified. The system is applied to the 40-Gbit/s 400-km transmision experiment where error free operation is confirmed for 76 hours.
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