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Equalization-enhanced phase noise induced timing jitter
Keang-Po Ho1, Alan Pak Tao Lau, William Shieh
1SiBEAM Technologies, Sunnyvale, California 94085, USA. kpho@ieee.org
Optics Letters
|February 18, 2011
Summary
Equalization-enhanced phase noise (EEPN) in optical systems causes timing jitter. This jitter impacts high-speed signals, reaching 20% of the symbol interval for 100 Gbit/s quadrature-phase-shift keying signals over 1500 km.
Area of Science:
- Optical communication systems
- Digital signal processing
- Photonics
Background:
- Digital equalization in optical systems combats chromatic dispersion.
- Local oscillator phase noise is a critical factor in signal quality.
- Equalization-enhanced phase noise (EEPN) arises from the interaction between equalization and phase noise.
Purpose of the Study:
- To investigate the impact of EEPN on signal integrity in high-speed optical communication.
- To quantify the timing jitter induced by EEPN in digital signal processing.
- To analyze the relationship between laser linewidth, transmission distance, and timing jitter.
Main Methods:
- Simulated a 100 Gbit/s quadrature-phase-shift keying (QPSK) optical communication system.
- Modeled the interaction between digital chromatic dispersion equalization and local oscillator phase noise.
- Calculated the resulting EEPN and induced timing jitter.
Main Results:
- EEPN was identified as a significant source of timing jitter.
- For a 100 Gbit/s QPSK signal with a 300 kHz laser linewidth, timing jitter reached up to 20% of the symbol interval.
- This jitter occurred over a transmission distance of 1500 km.
Conclusions:
- EEPN poses a substantial challenge to high-speed optical communication systems.
- Timing jitter induced by EEPN can limit achievable transmission distances and data rates.
- Mitigation strategies for EEPN are crucial for future optical network performance.
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