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Coupling-induced phase shift in a microring-coupled Mach-Zehnder interferometer.

S Darmawan1, Landobasa Y M Tobing, T Mei

  • 1Photonics Research Centre and Nanophotonics Laboratory, School of Electrical and Electronic Engineering,Nanyang Technological University, Singapore 639798, Singapore.

Optics Letters
|January 19, 2010
PubMed
Summary
This summary is machine-generated.

We experimentally investigated the coupling-induced phase shift (CIPS) in silicon microring-coupled Mach-Zehnder interferometer (MZI) devices. Adjusting the MZI arm width effectively compensated for CIPS, achieving a near-ideal flat-top filter response.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Semiconductor Devices

Background:

  • Silicon-on-insulator (SOI) technology is crucial for integrated photonics.
  • Mach-Zehnder interferometers (MZIs) are fundamental optical components.
  • Flat-top optical filters are essential for wavelength-division multiplexing (WDM) systems.

Purpose of the Study:

  • To experimentally investigate the coupling-induced phase shift (CIPS) in microring-coupled MZI devices.
  • To evaluate the performance of these devices for flat-top filter applications.
  • To demonstrate a method for compensating CIPS and achieving a box-like filter response.

Main Methods:

  • Experimental fabrication of silicon-on-insulator microring-coupled MZI devices.
  • Theoretical modeling of optical filter characteristics.
  • Precise adjustment of the uncoupled MZI arm width for phase compensation.
  • Characterization of filter spectral response and deviation from ideal requirements.

Main Results:

  • Excellent agreement between theoretical modeling and experimental results was achieved.
  • The coupling-induced phase shift (CIPS) was experimentally quantified.
  • A width offset in the uncoupled MZI arm was shown to effectively compensate for CIPS.
  • A box-like filter response with a minimal deviation of 0.02% from the ideal requirement was demonstrated.

Conclusions:

  • Width offset is a viable technique to compensate for CIPS in microring-coupled MZI devices.
  • This compensation method enables the realization of high-performance flat-top optical filters.
  • The findings contribute to the advancement of integrated photonic devices for telecommunications and signal processing.