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Related Experiment Video

Updated: Jun 26, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Published on: May 30, 2014

Decision-aided maximum likelihood detection in coherent optical phase-shift-keying system.

S Zhang¹, P Y Kam, J Chen

¹Department of Electrical & Computer Engineering, National University of Singapore,117576, Singapore.

|January 23, 2009

Summary

A new decision-aided maximum likelihood (DA ML) technique improves carrier phase estimation in optical systems. This linear algorithm outperforms traditional methods, particularly with dominant nonlinear phase noise.

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Area of Science:

Optical Communications
Signal Processing

Background:

Coherent optical phase-shift-keying (PSK) systems require accurate carrier phase estimation.
Existing methods, like the Mth power scheme, face challenges with nonlinear phase noise.

Purpose of the Study:

To introduce a novel decision-aided maximum likelihood (DA ML) technique for carrier phase estimation.
To evaluate the performance of the DA ML scheme in coherent optical systems.

Main Methods:

Developed a totally linear computational algorithm for the DA ML scheme.
Simulated the DA ML receiver's performance against conventional methods.

Main Results:

The DA ML technique is feasible for on-line processing in real-time systems.
DA ML receiver demonstrates superior performance compared to the Mth power scheme.
Performance gains are most significant when nonlinear phase noise is dominant.

Conclusions:

The proposed DA ML technique offers an effective solution for carrier phase estimation in coherent optical systems.
The linearity and performance advantages make DA ML suitable for practical implementation.