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All-optical technique for modulation format conversion from on-off-keying to alternate-mark-inversion.

J M Dailey1, R P Webb, R J Manning

  • 1Department of Physics, Tyndall National Institute, University College Cork, Lee Maltings, Cork, Ireland. james.dailey@tyndall.ie

Optics Express
|October 14, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a new all-optical converter for 40 Gbps signals. The semiconductor optical amplifier-based Mach-Zehnder interferometer converts on-off-keying to alternate-mark-inversion, achieving perfect phase inversion.

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Area of Science:

  • Photonics and Optical Communications
  • Semiconductor Devices
  • Signal Processing

Background:

  • High-speed optical communication systems require efficient modulation format conversion.
  • Semiconductor optical amplifiers (SOAs) are key components in all-optical signal processing.
  • Mach-Zehnder interferometers (MZIs) offer versatile platforms for optical signal manipulation.

Purpose of the Study:

  • To propose and numerically investigate a novel all-optical converter for on-off-keying (OOK) to alternate-mark-inversion (AMI) modulation format.
  • To achieve high-speed operation at 40 Gbps.
  • To analyze the performance and characteristics of the proposed device.

Main Methods:

  • Utilizing a semiconductor optical amplifier (SOA)-based Mach-Zehnder interferometer (MZI).
  • Performing numerical simulations to investigate the converter's operation.
  • Modeling the device as a pulse subtractor to achieve phase inversion.

Main Results:

  • Demonstrated that the SOA-MZI functions as an effective pulse subtractor.
  • Achieved perfectly phase-inverted pulses in the absence of patterning.
  • Quantified the impact of patterning on output phase modulation using a phase compression factor.

Conclusions:

  • The proposed SOA-MZI is a viable solution for all-optical OOK to AMI conversion at 40 Gbps.
  • The device exhibits robust phase inversion capabilities.
  • Understanding patterning effects is crucial for optimizing phase modulation in such converters.