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Related Concept Videos

Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Level coding technique for a wavelength-division-multiplexed optical access system using a remodulation scheme.

Qi Guo1, An V Tran

  • 1Victoria Research Laboratory, National ICT Australia, Level 2, Electrical and Electronic Engineering, University of Melbourne, Parkville, Victoria 3010, Australia. q.guo@pgrad.unimelb.edu.au

Optics Letters
|October 3, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel level-correlation coding technique for wavelength-division-multiplexed optical access networks. This method enhances tolerance to downstream extinction ratio (ER(d)) and extends system reach by 40 km.

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Area of Science:

  • Optical communication systems
  • Telecommunications engineering

Background:

  • Wavelength-division-multiplexing (WDM) optical access networks use downstream (DS) signal remodulation for upstream transmission, reducing cost and complexity.
  • Amplitude remodulation introduces intensity noise, degrading system performance and necessitating DS extinction ratio (ER(d)) optimization.

Purpose of the Study:

  • To present a novel technique to overcome ER(d) limitations in WDM optical access networks.
  • To improve system performance by mitigating noise and crosstalk while extending reach.

Main Methods:

  • Introducing correlations into the DS signal levels to modify its spectrum.
  • Employing level-correlation coding to manage signal characteristics.
  • Analyzing the impact on ER(d) tolerance and system reach.

Main Results:

  • Achieved a 4 dB improved tolerance to DS extinction ratio (ER(d)).
  • Successfully mitigated in-band crosstalk induced by Rayleigh backscattering.
  • Extended the system reach by 40 km.

Conclusions:

  • The proposed level-correlation coding technique effectively overcomes ER(d) restrictions in WDM optical access networks.
  • This approach enhances system performance, reduces noise, and significantly extends network reach.