CDR clock data recovery function plays a vital role in the process of optical module signal transmission, today, we will introduce to you what exactly is CDR clock data recovery.

CDR‘s full name is Clock and Data Recovery, translated as clock data recovery, can be simply understood as: the receiver side of the optical signal into an electrical signal, by the way, the electrical domain of the shaping and clock recovery. CDR has two main roles, the first is to provide the receiver side of the circuit clock signal; the second is the received signal for the judgment, to facilitate the recovery of data signals and subsequent processing.

Because the optical signal transmission to a certain distance, usually long distance transmission, the waveform will appear a certain degree of distortion, the signal received at the receiver end is a pulse signal of varying length, this time at the receiver end, we can not get the data we need. Therefore, this time there is a need for signal regeneration, signal regeneration function for re-amplification, re-shaping and re-timing, where the re-timing refers to the CDR clock data recovery.

In short, the CDR clock data recovery function in the optical module is the biggest role is to make the signal at the receiving end and the transmitting end of the signal to maintain consistency. Generally will use to CDR optical module, most are some high speed, long distance transmission optical module, for example: 10G SFP + ER/10G SFP + ZR will generally be used, the use of CDR chip optical module will be locked rate, can not be used to downscale.