Fast timing extraction method for an optical passive bus

A new timing extraction method that uses a tank circuit for bursty transmissions on an optical passive bus is proposed. The tank circuit has two quality factor values. In the preamble field the value of Q is low so as to extract the timing clock from short preambles. In the transferring field the value of Q is high to retain the extracted timing clock even if a less redundant code is used. It is confirmed by an optical transmission experiment that the proposed method can achieve fast bit timing extraction from a four bit preamble at 600 Mbit/s.