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Bidirectional Coupler Study for Chip-Based Spectral-Domain Optical Coherence Tomography.

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Summary
This summary is machine-generated.

This study presents a chip-based spectral-domain optical coherence tomography (SD-OCT) system. It uses a Mach-Zehnder directional coupler and echelle grating to achieve a broad, flat wavelength response, improving signal-to-noise ratios.

Keywords:
coupleroptical coherence tomographywaveguide

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Area of Science:

  • Optical Engineering
  • Biomedical Imaging
  • Nanotechnology

Background:

  • Chip-based spectral-domain optical coherence tomography (SD-OCT) systems require precise optical power division for high signal-to-noise ratios.
  • The flatness of the optical power divider across the wavelength range is critical for optimal performance.

Purpose of the Study:

  • To investigate the use of a Mach-Zehnder directional coupler (MZDC) on a silicon platform for achieving a 50:50 splitting ratio in SD-OCT systems.
  • To explore methods for compensating the non-flat optical power response of bidirectional MZDCs to enhance SD-OCT performance.

Main Methods:

  • Utilized a Mach-Zehnder directional coupler (MZDC) structure on a silicon platform, designed for a 50:50 splitting ratio and process variation insensitivity.
  • Implemented an echelle grating for spectrum compensation to address the non-flat optical power response of the bidirectional MZDC.
  • Evaluated the signal-to-noise ratio improvement and axial resolution maintenance in the on-chip SD-OCT system.

Main Results:

  • The bidirectional MZDC structure, despite not having a flat response, demonstrated a 20 dB signal-to-noise ratio improvement in SD-OCT after echelle grating compensation.
  • The echelle grating proved insensitive to process shifts, effectively compensating for the MZDC's limitations.
  • A broad and flat 100 nm wavelength response was achieved in the interferometer.

Conclusions:

  • A bidirectional MZDC combined with echelle grating compensation is a viable approach for enhancing on-chip SD-OCT systems.
  • This method improves signal-to-noise ratios while maintaining axial resolution and sensitivity.
  • The developed system offers a robust solution for integrated optical coherence tomography.