The primary role of CDR in an optical module is to recover the clock signal from the incoming high-speed serial data and re-synchronize the data stream at the receiver. This is essential because, in high-speed optical communication, the clock and data are transmitted together, and the receiver cannot rely on a separate clock line. CDR acts like a “signal metronome,” ensuring that the receiver interprets the transmitted data correctly and consistently with the transmitter .
CDR performs three key operations:
CDR can be visualized as an intelligent dispatch system: the transmitted data is like a train carrying goods (data), and the clock is the rhythm of the train. The CDR ensures that the receiver “unloads” the data in the correct order and timing, preserving the integrity of the transmitted information . In summary, CDR is indispensable for high-speed optical modules, enabling accurate data recovery, reducing errors, and maintaining signal integrity across long distances and high-speed networks.
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