Relaxed laser control of uncooled multiple-input and multiple-output dense wavelength-division multiplexing systems for low power consumption data communication links

A simulation-based assessment is made of the benefits of using advanced modulation formats including pulse amplitude modulation (PAM) and carrierless amplitude/phase modulation (CAP) to ease laser control requirements of a recently proposed novel uncooled multiple-input and multiple-output wavelengt...

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Bibliographic Details
Published in:IET optoelectronics 2015-02, Vol.9 (1), p.16-23
Main Authors: von Lindeiner, Johannes Benedikt, Ingham, Jonathan, Penty, Richard, White, Ian
Format: Article
Language:English
Subjects:
bit rate 25 Gbit/s
CAP‐16
carrierless amplitude‐phase modulation
channel spacing
Channels
Control systems
dense WDM system
distance 20 km
Lasers
link distance
Links
low power consumption data communication links
MIMO communication
Modulation
modulation formats
Multiplexing
Noise levels
nonreturn‐to‐zero modulation
NRZ
optical links
optical modulation
optical system power margin
PAM‐4
per channel bit rate
pulse amplitude modulation
relaxed laser control
simulation‐based assessment
spectral efflciency
uncooled multiple‐input multiple‐output dense wavelength‐division multiplexing systems
Wavelength division multiplexing
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Summary:A simulation-based assessment is made of the benefits of using advanced modulation formats including pulse amplitude modulation (PAM) and carrierless amplitude/phase modulation (CAP) to ease laser control requirements of a recently proposed novel uncooled multiple-input and multiple-output wavelength-division multiplexing (WDM) system. At a per channel bit rate of 25 Gb/s, the spectral efficiency improvements inherent to these schemes provide additional optical system power margin over non-return-to-zero (NRZ) modulation (0.4 dB for PAM-4 and 4.4 dB for CAP-16) for a link distance of 20 km. This allows the minimum channel spacing between channels to be reduced from 0.4 nm (NRZ) to 0.3 nm for PAM-4 and to 0.14 nm for CAP-16, this in turn allowing for a more stable operating region to be realised. Compared with a traditional 16 × 25 Gb/s dense WDM system, a power consumption saving of 30% can be realised using NRZ whereas PAM-4 and CAP-16 offer 29 and 27% savings, respectively.
ISSN:1751-8768
1751-8776
1751-8776
DOI:10.1049/iet-opt.2014.0003