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Related Experiment Video

Updated: May 25, 2026

Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

High-bandwidth generation of duobinary and alternate-mark-inversion modulation formats using SOA-based signal

James M Dailey¹, Mark J Power, Roderick P Webb

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

|January 26, 2012

Summary

Researchers developed an all-optical method to convert signals into duobinary (DB) and alternate-mark-inversion (AMI) formats at 42.6 Gb/s. This technology advances optical communication by enabling new modulation schemes.

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Area of Science:

Optoelectronics and Optical Communications
Signal Processing and Modulation Formats

Background:

High-speed optical communication systems require efficient modulation format conversion.
Existing methods for generating duobinary (DB) and alternate-mark-inversion (AMI) can be complex or limited in speed.

Purpose of the Study:

To demonstrate a novel all-optical method for generating DB and AMI modulation formats.
To achieve high-speed conversion (42.6 Gb/s) from an on-off keyed (OOK) input signal.
To investigate methods for extending operational bandwidth and suppressing pattern effects.

Main Methods:

Utilized a modulation converter comprising two semiconductor optical amplifier (SOA)-based Mach-Zehnder interferometer gates.
Employed a detailed SOA model for numerical confirmation of operational principles.
Conducted experimental validation of the all-optical conversion process.

Main Results:

Successfully demonstrated all-optical generation of DB and AMI modulation formats at 42.6 Gb/s.
Numerical simulations confirmed the operational principles of the SOA-based Mach-Zehnder interferometer gates.
Achieved significant reduction in patterning effects up to 160 Gb/s using a novel suppression scheme, with a trade-off in output power at higher bitrates.

Conclusions:

The proposed all-optical converter effectively generates DB and AMI formats at high speeds.
The SOA-based Mach-Zehnder interferometer approach is viable for advanced optical modulation.
Pattern-effect suppression schemes show promise for extending bandwidth beyond 40 Gb/s, though output power considerations are critical at higher bitrates.