| 摘要 |
The present invention relates to a method and apparatus for coherent detection of optical signals, in particular an optical receiver for coherent detection of PSK-modulated optical signals. A method for coherent detection of optical signals comprises the steps: mixing a received signal beam with a beam of a local oscillator; detecting the beat between the signal beam and the local oscillator beam; estimating the carrier phase component of the signal; and determining the signal phase component under consideration of the estimated carrier phase. The estimation of the carrier phase component comprises: processing the signal to cancel the modulated phase; averaging the processed signal over a number of samples; and estimating the carrier phase from the averaged signal. According to the invention, the number of samples for averaging the processed signal is dynamically adapted based on the impairment of the received signal.
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