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Integrated photonic threshold comparator based on square-wave synthesis.

Yossef Ehrlichman1, Ofer Amrani, Shlomo Ruschin

  • 1School of Electrical Engineering, Faculty of Engineering, Tel-Aviv University, Tel-Aviv, 69978, Israel. syos@eng.tau.ac.il

Optics Express
|June 22, 2013
PubMed
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A novel photonic threshold comparator achieves a step-like electrical-to-optical response using Fourier series synthesis. This innovative design utilizes multimode interference couplers and phase shifters, avoiding optical material non-linearity for advanced optical signal processing.

Area of Science:

  • Photonics
  • Optical Signal Processing
  • Electrical Engineering

Background:

  • Traditional threshold comparators often rely on non-linear optical materials, limiting performance and integration.
  • Achieving a precise step-like electrical-to-optical (E/O) response is crucial for digital optical signal processing and computing.

Purpose of the Study:

  • To present a novel photonic threshold comparator design.
  • To demonstrate a method for achieving a sharp, step-like E/O response without relying on material non-linearity.

Main Methods:

  • Utilizing Fourier series synthesis to superimpose sine-wave responses.
  • Employing multimode interference (MMI) couplers and phase shifters to construct the comparator.
  • Generating a square-wave like E/O transfer function through constructive interference of optical signals.

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Main Results:

  • A photonic threshold comparator with a distinct step-like E/O response was successfully designed and presented.
  • The design leverages the interference properties of MMI couplers and phase shifters, not material non-linearities.
  • The approach effectively mimics the Fourier series representation of a square-wave using optical signal manipulation.

Conclusions:

  • The proposed photonic threshold comparator offers a non-linear-material-free approach to achieving precise optical switching.
  • This design provides a foundation for advanced optical signal processing and potentially all-optical computing systems.
  • The use of MMI couplers and phase shifters presents a scalable and integrable solution for photonic circuit design.