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Experimental demonstration of original optical filter based on multiply coupled waveguides
Optics Letters
|July 1, 2014
Summary
We experimentally demonstrated a novel optical filter using coupled waveguides, matching numerical simulations. This silicon photonics device shows promise for advanced photonic applications.
Area of Science:
- Photonics and optical engineering
- Semiconductor device physics
Background:
- Optical filters are crucial components in photonic systems.
- Previous designs for multiply coupled waveguide filters were limited to numerical simulations.
Purpose of the Study:
- To experimentally demonstrate an optical filter based on multiply coupled waveguides.
- To validate numerical modeling techniques for complex photonic structures.
Main Methods:
- Experimental fabrication of a 12-directional coupler optical filter on a silicon-on-insulator wafer.
- 2D finite-difference time-domain (FDTD) method with modified effective index method (MEIM) for numerical modeling.
- Characterization of optical performance at a wavelength of 1.59 μm.
Main Results:
- Experimental results closely matched numerical modeling predictions.
- Achieved a free spectral range of approximately 16 nm and a 3 dB linewidth of approximately 1.6 nm.
- Identified fabrication imperfections like sidewall roughness as sources of parasitic responses.
Conclusions:
- The modified effective index method (MEIM) accurately models phase and group indices for 3D silicon waveguides.
- The demonstrated optical filter is manufacturable using CMOS-compatible technology.
- The filter design is promising for various photonic applications, with potential for improvement through technological advancements.
