Multichannel optical transport network optical detection skew calibration
First Claim
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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Accused Products
Abstract
A system and method are provided for calibrating temporal skew in a multichannel optical transport network (OTN) transmission device. The method accepts a pair of 2n-phase shift keying (2n-PSK) modulated signals, as well as a pair of 2p-PSK modulated signals. The 2n-PSK and 2p-PSK signals are converted to 2n-PSK and 2p-PSK optical signals, respectively. The 2n-PSK and 2p-PSK optical signals are orthogonally polarized and transmitted. A timing voltage is generated that is responsive to the intensity of the orthogonally polarized signals. The timing voltage is correlated to a reference frame calibration pattern associated with a preamble/header portion of an OTN frame. Then, the timing voltages associated with the Ix, Qx, Iy, and Qy signal paths are compared, and the misalignment between the timing voltages and the reference frame calibration pattern is minimized in response to adjusting time delay modules in the Ix, Qx, Iy, and Qy signal paths.
4 Citations
20 Claims
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1. A method for calibrating temporal skew in a multichannel optical transport network (OTN) transmission device, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a multichannel optical transport network (OTN) transmission device, a system for calibrating temporal skew, system method comprising:
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an Ix skew module having an input to accept an Ix signal from a pair of 2n-phase shift keying (2n-PSK) modulated signals, where n>
1, the Ix skew module having a control port and an output to supply the Ix signal delayed in time in response to signals received at the control port;a Qx skew module having an input to accept an Qx signal from the pair of 2n-PSK modulated signals, the Qx skew module having a control port and an output to supply the Qx signal delayed in time in response to signals received at the control port; an Iy skew module having an input to accept an Iy signal from a pair of 2p-PSK modulated signals, where p>
1, the Iy skew module having a control port and an output to supply the Iy signal delayed in time in response to signals received at the control port;a Qy skew module having an input to accept an Qy signal from the pair of 2p-PSK modulated signals, the Qy skew module having a control port and an output to supply the Qy signal delayed in time in response to signals received at the control port; a first modulation module to accept the delayed Ix and Qx signals, and an output to supply a 2n-PSK optical signal; a second modulation module to accept the delayed Iy and Qy signals, and an output to supply a 2p-PSK optical signal; a polarization multiplexer having inputs to accept the 2n-PSK and 2p-PSK optical signals and an output to supply multiplexed orthogonally polarized 2nPSK and 2pPSK optical signals for transmission; and
,a detector having an input to accept sampled 2n-PSK and 2p-PSK optical signals and generating a timing voltage responsive to detecting the intensity of the orthogonally polarized signals, the detector correlating the timing voltage to a reference frame calibration pattern associated with a preamble/header portion of an OTN frame and comparing timing voltages associated with the Ix, Qx, Iy, and Qy signal paths, the detector having an output to supply control signals to the Ix, Qx, Iy, and Qy skew modules, for minimizing misalignment between the timing voltages and the reference frame calibration pattern in response to adjusting time delays in the Ix, Qx, Iy, and Qy signal paths. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification