All optical logic gates based on two-photon absorption

S. Ma*, A. Kotb, Z. Chen, N. K. Dutta

*Corresponding author for this work

Research output: Chapter in Book or Report/Conference proceedingConference Proceedingpeer-review

11 Citations (Scopus)


When the two-photon absorption of a high intensity pump beam takes place in a semiconductor optical amplifier there is an associated fast phase change of a weak probe signal. A scheme to realize fast all-optical XOR logic function using twophoton absorption induced phase change has been analyzed. Rate equations for semiconductor optical amplifiers, for input data signals with high intensity, configured in the form of a Mach-Zehnder interferometer has been solved. The input intensities are high enough so that the two-photon induced phase change is larger than the regular gain induced phase change. The model shows that both XOR operation and pseudorandom binary sequence generation at 250 Gb/s with good signal to noise ratio is feasible.

Original languageEnglish
Title of host publicationPhotonics North 2010
Publication statusPublished - 2010
EventPhotonics North 2010 - Niagara Falls, ON, Canada
Duration: 1 Jun 20103 Jun 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferencePhotonics North 2010
CityNiagara Falls, ON


  • optical logic
  • semiconductor optical amplifier
  • two-photon absorption


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