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Related Concept Videos

Active Filters01:25

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
Passive Filters01:27

Passive Filters

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Published on: June 8, 2018

Digital filters for coherent optical receivers.

Seb J Savory1

  • 1Optical Networks Group, Dept. of Electronic & Electrical Engineering, University College London, Torrington Place, London WC1E 7JE,UK. ssavory@ee.ucl.ac.uk

Optics Express
|June 11, 2008
PubMed
Summary

Digital signal processing (DSP) in coherent optical receivers effectively compensates for transmission impairments like chromatic dispersion and polarization mode dispersion. This research presents an analytical solution for filter design, improving compensation efficiency for high-speed optical networks.

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Area of Science:

  • Optical Communications
  • Digital Signal Processing
  • Telecommunications Engineering

Background:

  • Coherent optical receivers utilize digital filters and digital signal processing (DSP) to overcome transmission impairments.
  • Polarization mode dispersion and chromatic dispersion are significant challenges in high-speed optical data transmission.

Purpose of the Study:

  • To investigate the application of digital filters and DSP for mitigating transmission impairments in coherent optical receivers.
  • To develop an analytical solution for designing chromatic dispersion compensating filters.
  • To evaluate the performance of digital polarization tracking.

Main Methods:

  • Experimental investigation of polarization mode dispersion compensation.
  • Analytical derivation of a chromatic dispersion compensating filter design.
  • System simulations to determine filter tap requirements and polarization tracking capabilities.

Main Results:

  • An analytical solution for chromatic dispersion compensating filter design was derived.
  • An improved upper bound of 2.2 taps per 1000ps/nm for compensating chromatic dispersion with 10.7GBaud data was determined through simulation.
  • Digital polarization tracking using DSP demonstrated the ability to track 100krad/s polarization rotations with a clock frequency below 500MHz.

Conclusions:

  • Digital filters and DSP are crucial for advanced coherent optical receiver performance.
  • The proposed analytical solution and simulation results offer efficient methods for dispersion compensation.
  • DSP enables effective real-time tracking of rapid polarization changes in optical systems.