Clock and data recovery unit and power control method therefor and PON system

摘要

In the present invention, wasted power consumption caused when a clock and data recovery unit in an optical network unit in a PON system is activated from a power-saving state is reduced and rapid, secure communication is performed. A clock and data recovery unit includes a phase-locked loop that can be set to normal mode or power-saving mode and that includes a voltage-controlled oscillator and recovers a clock signal and a data signal from input signals. The clock and data recovery unit includes a reference clock multiplier circuit that multiplies a reference clock signal and outputs the multiplied reference clock signal; and a frequency training loop that includes the same voltage-controlled oscillator and performs synchronous oscillation training by the voltage-controlled oscillator using the reference clock multiplier circuit before the phase-locked loop transitions from power-saving mode to normal mode.

主权项

1. A clock and data recovery unit used for optical communication using a burst signal, the clock and data recovery unit comprising:
a reference clock multiplier circuit that multiplies a reference clock signal and outputs a multiplied reference clock signal; a phase-locked loop that can be set to power-saving mode in addition to normal mode and that includes a voltage-controlled oscillator, the phase-locked loop recovering a clock signal and a data signal from input signals; and a frequency training loop that includes the voltage-controlled oscillator and performs synchronous oscillation training by the voltage-controlled oscillator using the reference clock multiplier circuit before the phase-locked loop transitions from the power-saving mode to the normal mode.