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Receiver bandwidth effects on complex modulation and detection using directly modulated lasers.

Feng Yuan, Di Che, William Shieh

|April 30, 2016

Summary

This summary is machine-generated.

Complex modulated directly modulated lasers (DMLs) offer enhanced signal quality but risk spectrum broadening. This study shows DML-based systems tolerate reduced receiver bandwidth, enabling cost-effective, high-performance optical communications.

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Area of Science:

Optical communications
Photonics
Laser technology

Background:

Directly modulated lasers (DMLs) are cost-effective for short-to-medium reach optical links.
Complex modulation schemes enhance signal-to-noise ratio (SNR) sensitivity in DMLs.
Chirp-induced spectral broadening in complex modulation may necessitate high-bandwidth receivers.

Purpose of the Study:

To investigate the impact of receiver bandwidth on complex modulation and coherent detection systems using DMLs.
To determine the feasibility of using narrow-bandwidth receivers in these systems.
To assess the performance trade-offs associated with reduced receiver bandwidth.

Main Methods:

Experimental demonstration of complex modulation and coherent detection with DMLs.
System performance evaluation under varying electrical receiver bandwidth conditions.
Analysis of 10 Gbaud 4-level pulse amplitude modulation (4-PAM) signal performance.

Main Results:

Complex modulated DML systems show tolerance to reduced receiver bandwidth.
Required electrical bandwidths of 8.5 GHz and 7.5 GHz were achieved for 7% and 20% forward error correction (FEC), respectively.
Performance degradation was minimal even with narrowed bandwidths.

Conclusions:

DML-based complex modulation systems can effectively utilize cost-effective, narrow-bandwidth receivers.
The findings support the practical implementation of advanced modulation techniques in low-cost optical transceivers.
Reduced receiver bandwidth does not significantly compromise the performance benefits of complex modulation in DML systems.