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Inserting a cyclic prefix using Arrayed-Waveguide Grating Routers in all-optical OFDM transmitters.

Arthur James Lowery1

  • 1Department of Electrical and Computer Systems Engineering, Monash University, Wellington Road, Clayton, Victoria. 3800, Australia. arthur.lowery@monash.edu

Optics Express
|April 27, 2012
PubMed
Summary
This summary is machine-generated.

Adding a cyclic prefix (CP) to Arrayed-Waveguide Grating Routers (AWGR) in optical OFDM systems significantly enhances subcarrier orthogonality and timing error resilience. This modification also enables uncompensated fiber dispersion.

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Area of Science:

  • Optical communications
  • Signal processing

Background:

  • Arrayed-Waveguide Grating Routers (AWGR) are key components in optical Orthogonal Frequency Division Multiplexing (OFDM) systems, acting as multiplexers/demultiplexers.
  • AWGRs integrate serial-to-parallel conversion and optical Fourier transform functionalities.

Purpose of the Study:

  • To investigate the modification of AWGR design for incorporating a cyclic prefix (CP) or postfix (CP) at the transmitter.
  • To evaluate the impact of CP insertion on optical OFDM system performance.

Main Methods:

  • Simulations of a 4-subcarrier optical OFDM system were conducted.
  • Comparisons were made between systems with no CP, a guard interval, and a CP.
  • AWGR design modifications for CP insertion were explored.

Main Results:

  • The insertion of a CP significantly improves subcarrier orthogonality.
  • Systems with CP demonstrate enhanced resilience to timing errors.
  • CP allows for uncompensated fiber dispersion, particularly with adjusted subcarrier timing.

Conclusions:

  • Modifying AWGR design to include a CP is an effective strategy for improving optical OFDM system performance.
  • CP insertion offers benefits in terms of signal integrity and robustness against channel impairments.
  • This technique facilitates simpler system designs by mitigating the need for dispersion compensation.