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Signed frequency offset measurement for direct detection DPSK system with a chromatic dispersion offset.

Jian Zhao1, Alan Pak Tao Lau, Khurram Karim Qureshi

  • 1Tianjin University of Technology, Engineering Research Centre of Communication Devices (Ministry of Education), Tianjin Key Laboratory of Film Electronic and Communication Device, School of Computer and Communication Engineering, Tianjin 300000, China. hkzhaojian@gmail.com

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Summary

We developed a new method to measure the signed frequency offset in optical communication systems. This technique accurately determines both the magnitude and polarity of frequency deviations in 10 Gb/s DPSK signals.

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Area of Science:

  • Optical communications
  • Signal processing
  • Metrology

Background:

  • Accurate frequency offset measurement is crucial for high-speed optical systems.
  • Existing methods may struggle with simultaneous magnitude and polarity determination.
  • Chromatic dispersion can complicate signal demodulation and offset analysis.

Purpose of the Study:

  • To propose and validate a novel method for measuring signed frequency offset in 10 Gb/s Differential Phase Shift Keying (DPSK) signals.
  • To demonstrate the capability of the method to determine both the magnitude and polarity of the frequency offset.
  • To analyze the impact of chromatic dispersion on signal asymmetry and its relation to frequency offset.

Main Methods:

  • Utilized asynchronous delay-tap sampling technique.
  • Introduced a chromatic dispersion (CD) offset to induce signal asymmetry.
  • Analyzed demodulated DPSK signal waveforms and delay-tap sampling scatter plots for distortion patterns.

Main Results:

  • Observed asymmetrical signal properties and amplitude shoulders on waveforms with combined frequency and CD offset.
  • Delay-tap sampling scatter plots confirmed signal asymmetry linked to distortion.
  • Successfully measured signed frequency offset within a range of -2 GHz to +2 GHz with ±100 MHz sensitivity.

Conclusions:

  • The proposed method effectively measures signed frequency offset in 10 Gb/s DPSK signals.
  • Signal asymmetry serves as a reliable indicator for frequency offset magnitude and polarity.
  • The technique shows good agreement between simulation and experimental results.