This paper gives a newly developed data and clock recovery module used in high speed optical fiber communication systems

and describes its designing methods

operating principles and technical features. At present

the volume of the module used in 565 Mbit/s or 622Mbit/s is 50×50×6 （mm

3

）

and its power dissipation is about 1.8W. It is estimated that a data and clock recovery module with a higher operating rate is available only if some devices are changed.