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Related Experiment Video

Updated: Feb 22, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Silicon Integrated Dual-Mode Interferometer with Differential Outputs.

Niklas Hoppe1, Pascal Scheck2, Rami Sweidan3

  • 1Institute of Electrical and Optical Communications Engineering (INT), University of Stuttgart, 70569 Stuttgart, Germany. niklas.hoppe@int.uni-stuttgart.de.

Biosensors
|September 15, 2017
PubMed
Summary

This study introduces a dual-mode interferometer (DMI) on silicon-on-insulator (SOI) platforms for enhanced refractive index sensing. The DMI offers unambiguous phase shift detection and stable performance, outperforming traditional Mach-Zehnder interferometers.

Keywords:
dual-modeintegrated photonicsinterferometerlab-on-a-chip

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Area of Science:

  • Photonics and Optical Sensing
  • Integrated Optics
  • Nanotechnology

Background:

  • Dual-mode interferometers (DMIs) offer high sensitivity for refractive index sensing.
  • Silicon-on-insulator (SOI) platforms enable compact, thermally stable photonic devices.
  • Conventional Mach-Zehnder interferometers (MZIs) require wavelength sweeps for phase detection.

Purpose of the Study:

  • To present the operational principle of an integrated DMI with differential outputs.
  • To demonstrate unambiguous phase shift detection using a single wavelength measurement.
  • To showcase the DMI's capability for compensating fluctuating optical power.

Main Methods:

  • Fabrication of DMIs with two differential single-mode outputs on a 250 nm SOI platform.
  • Experimental validation of the DMI's principle of operation.
  • Comparative analysis with conventional Mach-Zehnder interferometers on the same SOI technology.

Main Results:

  • The integrated DMI enables unambiguous phase shift detection at a single wavelength.
  • The DMI design compensates for variations in optical input power and attenuation.
  • Fabricated DMIs exhibit high performance characteristics suitable for sensor applications.

Conclusions:

  • The presented integrated DMI is a viable and advantageous alternative to MZIs for refractive index sensing.
  • The DMI's differential outputs simplify detection and improve robustness against power fluctuations.
  • SOI technology is well-suited for fabricating compact and high-performance DMIs for advanced sensing.