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Beyond amplitude-only detection for digital coherent system using directly modulated laser.

Qian Hu, Di Che, Yifei Wang

|June 16, 2015

Summary

This study introduces digital coherent detection using both phase and amplitude of directly modulated signals. The novel algorithm achieved a significant 6-dB improvement over amplitude-only detection methods.

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Area of Science:

Optical Communications
Signal Processing
Digital Coherent Detection

Background:

Directly modulated signals are crucial in optical communication systems.
Traditional detection schemes often rely solely on signal amplitude.
Limitations exist in maximizing information extraction from modulated signals.

Purpose of the Study:

To demonstrate the first experiment on digital coherent detection utilizing both phase and amplitude of directly modulated signals.
To introduce a novel algorithm for simultaneous phase and amplitude detection.
To evaluate the performance improvement offered by this dual-parameter detection scheme.

Main Methods:

Implementation of a digital coherent detection system.
Development and application of a novel algorithm for simultaneous phase and amplitude signal analysis.
Experimental setup to transmit and receive directly modulated optical signals.

Main Results:

Successful demonstration of digital coherent detection using both signal phase and amplitude.
The proposed algorithm effectively leverages both parameters for enhanced detection.
A 6-dB performance improvement was observed compared to amplitude-only detection.

Conclusions:

Simultaneous detection of phase and amplitude in directly modulated signals offers significant advantages.
The novel algorithm provides a pathway for more efficient optical signal detection.
This approach enhances the performance of digital coherent detection systems.