Abstract：Because of crystal oscillator error，inter-symbol interference and baseline drift in industrial optical

fiber communication，the optical fiber receiver has the problem of high error rate of data recovery. In long-distance

industrial communication，the electrical level jitter of serial data at the receiver will increase. To solve this problem，

a method of clock and data recovery for long-distance industrial optical fiber communication was proposed. Sixtimes frequency clock was used for sampling. The rising or falling edge of serial data can be determined and

collected under the same clock，which can select dynamical sampling clock. According to the electrical level jitter

tolerance，the validity of the sampled data under different conditions can be verified. After data processing，the sixtimes sampled data was restored to serial data under the local clock，which is finally converted to the parallel data.Simulation and test verified the effectiveness of the proposed method.

      Key words：clock and data recovery（CDR）；industrial optical fiber communication；field-programmable gate

array（FPGA）