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Related Concept Videos

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Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
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Related Experiment Video

Updated: May 12, 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

Joint digital signal processing for superchannel coherent optical communication systems.

Cheng Liu1, Jie Pan, Thomas Detwiler

  • 1School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.

Optics Express
|April 11, 2013
PubMed
Summary

A new super receiver architecture enables ultra-high-speed optical communication by jointly processing multiple sub-channels. This approach mitigates inter-channel interference, improving performance for terabit superchannels.

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Last Updated: May 12, 2026

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

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Published on: March 20, 2017

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
09:36

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

Area of Science:

  • Optical Communications
  • Signal Processing

Background:

  • Increasing demand for data capacity necessitates ultra-high-speed optical communication systems (≥ 1Tb/s per channel).
  • Achieving 1Tb/s per channel typically requires high-level modulation formats or high baud rates.
  • Terabit superchannels offer an alternative by grouping sub-carriers, potentially leveraging existing components.

Purpose of the Study:

  • To propose and demonstrate a novel "super receiver" architecture for practical Nyquist-Wavelength Division Multiplexing (WDM) systems.
  • To mitigate performance penalties arising from imperfect Nyquist-WDM spectral generation.
  • To relax stringent filter requirements on the transmitter side.

Main Methods:

  • Development of a "super receiver" architecture for simultaneous multi-channel detection and demodulation.
  • Implementation of two joint Digital Signal Processing (DSP) algorithms: linear inter-channel interference (ICI) cancellation and joint carrier-phase recovery.
  • Experimental and simulation-based validation of the proposed methods.

Main Results:

  • Demonstration of a receiver-side solution that effectively mitigates ICI in practical Nyquist-WDM systems.
  • Observed improvements in system performance through joint DSP algorithms.
  • Validation of the feasibility and robustness of the proposed algorithms across various system configurations.

Conclusions:

  • The proposed super receiver architecture and joint DSP algorithms offer a viable solution for practical Nyquist-WDM systems.
  • This approach relaxes transmitter constraints, enabling more robust terabit superchannel deployment.
  • The findings support the advancement of ultra-high-speed optical communication systems.