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Related Concept Videos

Maximum Power Transfer01:16

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Related Experiment Video

Updated: May 25, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Multilevel pulse-position modulation for optical power-efficient communication.

Magnus Karlsson1, Erik Agrell

  • 1Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. magnus.karlsson@chalmers.se

Optics Express
|January 26, 2012
PubMed
Summary
This summary is machine-generated.

New modulation formats combine pulse-position modulation (PPM) with dual-polarization signals. This approach achieves significant signal gains over existing methods but reduces spectral efficiency.

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Quasi-light Storage for Optical Data Packets
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Last Updated: May 25, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Area of Science:

  • Optical communications
  • Signal processing
  • Information theory

Background:

  • Dual-polarization Quadrature Amplitude Modulation (DQPSK) is a standard in high-capacity optical networks.
  • Pulse-position modulation (PPM) offers potential advantages in signal-to-noise ratio but is less common in high-speed systems.
  • Combining modulation techniques is an active area of research for improving optical communication performance.

Purpose of the Study:

  • To develop and analyze novel modulation formats by integrating pulse-position modulation (PPM) with multilevel dual-polarization signal constellations.
  • To quantify the performance gains achievable with these new formats compared to existing standards.
  • To evaluate the trade-offs between signal gain and spectral efficiency.

Main Methods:

  • Derivation of a new family of modulation formats combining PPM and dual-polarization multilevel constellations.
  • Theoretical analysis and simulation of the proposed modulation formats.
  • Comparison of the new formats with dual-polarization Quadrature Phase Shift Keying (QPSK) in terms of signal-to-noise ratio (SNR) and spectral efficiency.

Main Results:

  • The proposed modulation formats, particularly 16-PPM combined with dual-polarization constellations, demonstrate significant signal gains of up to 5.4 dB over dual-polarization QPSK.
  • These gains are achieved at the expense of reduced spectral efficiency.
  • The study provides a detailed analysis of the performance trade-offs.

Conclusions:

  • The integration of PPM with multilevel dual-polarization signal constellations offers a viable strategy for enhancing signal quality in optical communication systems.
  • The proposed modulation formats represent a promising advancement, particularly for applications where signal gain is critical.
  • Further research is needed to optimize spectral efficiency for practical deployment.