Clock recovery for optical transmission systems
A technology of optical communication system and sampling clock, which is applied in the field of receivers, and can solve the problems of impossibility, difficulty in starting the receiver of the optical transmission system, failure to start operation, etc.
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[0082] Embodiments of the present invention are described below by way of example only. These examples represent the best mode currently known to applicants to put the invention into practice, although they are not the only way in which the invention can be practiced. This description gives the functionality of the example and the sequence of steps used to build and operate the example. However, the same or equivalent functions and sequences can be implemented by different examples.
[0083] The 40Gbit / s DP-QPSK transmission system is used as the basis for the following description, but the described techniques can be applied to various transmission formats and rates without troublesome modifications.
[0084] Figure 10 A block diagram of a clock recovery system using a feedback loop 90 and a feedforward path 91 is shown. The phase detector 92 detects the phase of the output of the equalizer 74 . The output of phase detector 92 is fed back to voltage controlled oscillator...
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