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Tapered self-written waveguide for a silicon photonic chip I/O.
Optics Letters
|June 16, 2022
Summary
We developed a novel optical circuit for silicon photonics using silicon oxynitride waveguides to create tapered self-written waveguides (TSWWs). This method improves optical coupling to standard single-mode fibers, offering higher alignment tolerance and lower loss for co-packaged optics.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Co-packaged optics (CPO) using silicon photonics (SiPh) require efficient optical coupling.
- Conventional self-written waveguides (SWWs) are incompatible with silicon waveguides due to light emission limitations.
Purpose of the Study:
- To devise a new optical circuit enabling SWW formation from SiPh chips.
- To achieve efficient optical coupling between SiPh chips and standard single-mode fibers (SSMFs).
Main Methods:
- Fabrication of an optical circuit using silicon oxynitride (SiOxNy) waveguides.
- Formation of tapered self-written waveguides (TSWWs) for optical coupling.
- Characterization of optical coupling loss and alignment tolerance.
Main Results:
- Achieved optical coupling between an SiPh chip and SSMF using TSWWs.
- Demonstrated a lowest excess coupling loss of approximately 0.6 dB over the C-band.
- Showcased higher alignment tolerances compared to butt coupling with high-numerical aperture (NA) fibers.
Conclusions:
- The developed SiOxNy waveguide circuit enables efficient SWW formation for SiPh.
- The TSWW coupling method offers a promising solution for high-performance co-packaged optics with improved alignment tolerance.
