Open AccessRelaxed laser control of uncooled multiple‐input and multiple‐output dense wavelength‐division multiplexing systems for low power consumption data communication links
Author(s) -
Lindeiner Johannes Benedikt,
Ingham Jonathan,
Penty Richard,
White Ian
Publication year - 2015
Publication title -
iet optoelectronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 42
eISSN - 1751-8776
pISSN - 1751-8768
DOI - 10.1049/iet-opt.2014.0003
Subject(s) - power consumption , division (mathematics) , multiplexing , wavelength division multiplexing , computer science , electronic engineering , optical communication , laser , power (physics) , wavelength , computer network , materials science , telecommunications , optoelectronics , engineering , physics , optics , mathematics , quantum mechanics , arithmetic
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.