IMPROVED BURST-MODE CLOCK-DATA-RECOVERY (BM-CDR) FOR 10G-PON

摘要

An optical line terminal (OLT) for providing improved burst-mode clock-data-recovery (BM-CDR) for a 10 Gigabits per second -passive optical network (10G-PON). The OLT includes an upstream receiver configured to receive a block of data bits in the data stream. The OLT also includes a CDR module configured to perform oversampling of each data bit of the data stream at three or more sampling positions to generate a set of samples for each data bit for performing CDR, determine a number of transitions experienced by the samples at each sampling position with respect to its preceding sampling position, determine a most transitions sampling position, select an optimal sampling position out of at least two sampling positions that immediately follow the most transitions sampling position based on a predetermined criterion, and recover data in the data stream using the optimal sampling position.