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

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Cycle-slip-less low-complexity phase recovery algorithm for coherent optical receivers.

Valery Nobl Rozental, Deming Kong, Benjamin Foo

|September 16, 2017

Summary

This summary is machine-generated.

We developed filtered carrier-phase estimation (F-CPE), a novel blind phase recovery algorithm. This method effectively eliminates cycle slips in 16QAM signals, offering robust performance for optical communication systems.

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Area of Science:

Optical Communications
Signal Processing

Background:

Phase noise is a significant challenge in high-baudrate optical systems, leading to signal degradation and potential cycle slips.
Existing blind phase recovery algorithms often face computational complexity and limitations in handling amplified spontaneous emission (ASE) noise.

Purpose of the Study:

To propose and experimentally validate a novel blind phase recovery algorithm, filtered carrier-phase estimation (F-CPE).
To reduce computational complexity and eliminate cycle slips in 16 quadrature amplitude modulation (16QAM) systems.

Main Methods:

F-CPE tracks low-frequency components of phase noise, enabling the use of a frequency-domain equalizer.
The algorithm simplifies 16QAM constellation partitioning and suppresses ASE impact on phase noise estimation.
Experimental validation was performed using 15 and 32 GBd 16QAM signals.

Main Results:

Demonstrated cycle-slip-free operation for 15 and 32 GBd 16QAM signals.
Achieved similar or superior sensitivity compared to the blind-phase-search algorithm.
Performance was observed to be near standard forward error correction thresholds for modern wavelength division multiplexing (WDM) systems.

Conclusions:

F-CPE offers an effective solution for blind phase recovery in high-baudrate optical systems.
The algorithm's cycle-slip-free operation and improved sensitivity make it suitable for advanced WDM systems.
Reduced computational complexity enhances the practicality of F-CPE for real-world applications.