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Large-area binary blazed grating coupler between nanophotonic waveguide and LED.

Hongqiang Li1, Wenqian Zhou1, Meiling Zhang1

  • 1School of Electronics and Information Engineering, Tianjin Polytechnic University, No. 399, Binshuixi Road, Xiqing District, Tianjin 300387, China.

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Summary
This summary is machine-generated.

A novel large-area binary blazed grating coupler was developed for silicon-on-insulator (SOI) integrated microsystems. This grating coupler enables efficient light coupling from C-band LEDs for arrayed waveguide grating (AWG) demodulation.

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Area of Science:

  • Photonics and optical engineering
  • Integrated optics
  • Semiconductor device fabrication

Background:

  • Arrayed waveguide gratings (AWGs) are crucial for optical signal processing and wavelength demultiplexing.
  • Efficient light coupling into silicon-on-insulator (SOI) waveguides is a key challenge for integrated photonic microsystems.
  • Existing coupling methods often lack the large area required for integration with light sources like InP-based C-band LEDs.

Purpose of the Study:

  • To design and optimize a large-area binary blazed grating coupler for efficient light coupling.
  • To enable the integration of InP-based C-band LEDs with SOI-based AWG demodulation microsystems.
  • To achieve high coupling efficiency and broad bandwidth for practical photonic applications.

Main Methods:

  • Design and optimization using the finite difference time domain (FDTD) method.
  • Fabrication of a 360 μm x 360 μm binary blazed grating coupler.
  • Characterization of coupling efficiency and 3 dB bandwidth at 1550 nm wavelength.

Main Results:

  • Achieved a coupling efficiency of 40.92% at a 0° incident angle.
  • Obtained a 3 dB bandwidth of 72 nm at 1550 nm.
  • The grating coupler's dimensions match the InP-based C-band LED light emitting area.

Conclusions:

  • The developed binary blazed grating coupler is suitable for efficient light injection into SOI waveguides.
  • This advancement facilitates the realization of integrated AWG demodulation microsystems with InP-based light sources.
  • The large area and high performance of the coupler address critical integration challenges in silicon photonics.