Multichannel Optical Transport Network Optical Detection Skew Calibration

  • US 20100080570A1
  • Filed: 09/30/2008
  • Published: 04/01/2010
  • Est. Priority Date: 09/30/2008
  • Status: Active Grant
First Claim
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1. A method for calibrating temporal skew in a multichannel optical transport network (OTN) transmission device, the method comprising:

  • accepting a pair of 2n-phase shift keying (2n-PSK) modulated signals via Ix and Qx electrical signal paths, where n>

    1;

    accepting a pair of 2p-PSK modulated signals via Iy and Qy electrical signal paths where p>

    1;

    converting the 2n-PSK and 2p-PSK signals to 2n-PSK and 2p-PSK optical signals, respectively;

    multiplexing orthogonally polarized 2n-PSK and 2p-PSK optical signals;

    transmitting the orthogonally polarized signals;

    generating a timing voltage responsive to detecting the intensity of the orthogonally polarized signals;

    correlating the timing voltage to a reference frame calibration pattern associated with a preamble/header portion of an OTN frame;

    comparing timing voltages associated with the Ix, Qx, Iy, and Qy signal paths; and

    ,minimizing misalignment between the timing voltages and the reference frame calibration pattern in response to adjusting time delay modules in the Ix, Qx, Iy, and Qy signal paths.

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