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Universally balanced photonic interferometers.

Milos A Popović1, Erich P Ippen, Franz X Kärtner

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. milos@mit.edu

Optics Letters
|August 29, 2006
PubMed
Summary

Researchers introduce a novel optical interferometer class that splits spectra but ensures broadband constructive interference. This design, based on Maxwell

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Area of Science:

  • Optics and Photonics
  • Electromagnetism
  • Microphotonic Devices

Background:

  • Traditional optical interferometers face limitations in broadband operation and spectral control.
  • Existing microphotonic filter designs struggle with multiplying tuning and free spectral range effectively.

Purpose of the Study:

  • To propose a new general class of optical interferometers with unique spectral splitting capabilities.
  • To explain the physical operating principle based on fundamental electromagnetic properties.
  • To present an application of this interferometer class in enhancing microphotonic filters.

Main Methods:

  • Designing interferometers that split input spectra in a wavelength- and/or time-dependent manner.
  • Utilizing the time reversibility of Maxwell's equations for device operation.
  • Ensuring broadband constructive interference into a single output port through symmetry principles.
  • Applying a phase condition valid for lossless, reflectionless four-port devices.

Main Results:

  • A novel class of optical interferometers is theoretically proposed and its operating principle elucidated.
  • The design guarantees broadband constructive interference, overcoming limitations of conventional interferometers.
  • A new Vernier scheme is introduced, successfully multiplying the tuning and free spectral range of microphotonic add-drop filters.
  • Effective suppression of amplitude and phase responses for unwanted resonant passbands is achieved.

Conclusions:

  • The proposed optical interferometer class offers a new paradigm for spectral manipulation.
  • The design's reliance on fundamental physics (time reversibility, phase conditions) ensures broad applicability.
  • The demonstrated application in microphotonic filters highlights significant potential for advanced optical signal processing.

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