Hybrid Timing Recovery for Burst Mode Receiver in Passive Optical Networks

An apparatus for timing and data recovery for burst mode receivers comprising:

• a receiver;
• a coarse phase alignment circuit coupled to the receiver, wherein the coarse phase alignment circuit comprises a tapped delay line;
• at least one analog to digital converter (ADC) coupled to the coarse phase alignment circuit such that the coarse phase alignment circuit is positioned between the receiver and the ADC;
• and
• a fine phase alignment circuit coupled to the ADC such that the ADC is positioned between the coarse phase alignment circuit and the fine phase alignment circuit, wherein the fine phase alignment circuit produces a recovered data output.

A method of burst mode clock and data recovery at an Optical Line Terminal (OLT) in a Passive Optical Network (PON) comprising the steps of:

• receiving an upstream analog signal;
• aligning a coarse phase for the upstream analog signal using a fractional delay circuit;
• converting the coarse phase aligned upstream analog signal to a digital signal;
• aligning a fine phase for the digital signal;
• and
• outputting a recovered data signal.