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Cycle Slip Evaluation of Dual Polarized 12 Gsps QPSK Optical Channel

Cycle Slip Evaluation of Dual Polarized 12 Gsps QPSK Optical Channel. 15 November 2010. Optical Chanel Cycle Slip Analytical Simulator – Presentation Mode. Dual pole QPSK channel at 12 Giga-symbols per second on each pole Models phase and thermal noise independently on each pole

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Cycle Slip Evaluation of Dual Polarized 12 Gsps QPSK Optical Channel

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  1. Cycle Slip Evaluation of Dual Polarized 12 Gsps QPSK Optical Channel 15 November 2010

  2. Optical Chanel Cycle Slip Analytical Simulator – Presentation Mode • Dual pole QPSK channel at 12 Giga-symbols per second on each pole • Models phase and thermal noise independently on each pole • Phase noise expressed as Full Band Half Maximum (FBHM) power line width (Hz) • Horizontal – 500.5 kHz • Vertical – 205 kHz • Simulator presentation mode • Visual response to varying noise • Separate controls for each noise type • QPSK waveform, corrected and uncorrected constellation displayed Corrected phase constellation Horizontal pole constellations Vertical pole constellations Uncorrected phase constellation Window Size

  3. Optical Channel Cycle Slip Analytical Simulator – Analysis Mode Number of Test Cases From All Combinations of Input Variables • Evaluate variables across a range of values • Independent controls for each polarization • phase and thermal noise • BPE window size • Results output to Excel for data reduction • Discrete noise and window size input variables across specified range • Resulting range of output variables Line Width Range Per Pole BPE Window Size Range Signal to Noise Range Per Pole

  4. Excel Output - Phase and Thermal Noise Effect on Cycle Slip as a Function of the Block Phase Estimator (BPE) Window Size • Cycle Slip Likelihood for the given example • Phase noise dominate signals: Improves as the BPE window size decreases • thermal noise dominate signals Improves as the BPE window size increases up to ~255 points Degrades thereafter • Indicates ~120 point BPE should be best performer in the presence of phase and thermal noise

  5. Excel Output - Combined Phase and Thermal Noise Effect on Cycle Slip as a Function of the BPE Window Size • Cycle Slip Likelihood for the given example • Signal quality degradation due equally to phase and thermal noise: 500 KHz line width 5.3 dB signal to noise ratio • Best performance in the range of 100 – 130 point Block Phase Estimator

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