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Flexible spectrum sharing of two asynchronous phase-shift keying signals using power division multiplexing
Optics Letters
|February 29, 2020
Summary
This study demonstrates flexible spectrum sharing for two asynchronous phase-shift keying (PSK) signals using power division multiplexing. Advanced interference cancellation successfully recovered signals with high data integrity, enabling efficient optical network capacity.
Area of Science:
- Optical communications
- Signal processing
- Telecommunications engineering
Background:
- Spectrum sharing is crucial for increasing optical network capacity.
- Asynchronous signals pose challenges for traditional multiplexing techniques.
- Phase-shift keying (PSK) is a widely used digital modulation format.
Purpose of the Study:
- To investigate flexible spectrum sharing of asynchronous PSK signals.
- To explore the use of power division multiplexing for signal superposition.
- To analyze the performance of successive interference cancellation for signal recovery.
Main Methods:
- Numerical simulations and experimental validation.
- Superposition of two asynchronous PSK signals with different power levels.
- Application of successive interference cancellation (SIC) for signal recovery.
Main Results:
- A hybrid quadrature-amplitude-modulated (QAM) signal is generated upon superposition.
- Successful sequential recovery of a 20 Gbaud strong signal alongside 9 or 4 Gbaud weak signals.
- Bit-error rate (BER) below the forward error correction (FEC) threshold achieved.
- System performance is dependent on the power ratio between strong and weak signals.
Conclusions:
- Flexible spectrum sharing of asynchronous PSK signals is feasible using power division multiplexing.
- SIC enables robust recovery of superimposed signals with varying baudrates and modulation formats.
- This technique enhances spectral efficiency in optical communication systems.
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