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
Patent Images

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>


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


    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.

View all claims

    Thank you for your feedback