15032 – Reduced-loss taper structure to change the mode area for waveguides

Optimal structure for transfer of light between waveguidesMinimize on-chip footprintEasily applicable to a variety of platforms
  • Optimal structure for transfer of light between waveguides
  • Minimize on-chip footprint
  • Easily applicable to a variety of platforms


In photonics, it is common to require that trapped light be converted from strongly confined to weakly confined regions, for example when going from an off-chip silica-based fiber optic cable to a Si waveguide. In order to efficiently transfer light from these two waveguides, an inverse taper is often employed. Our design is such that the losses associated with each part of the taper are the same, resulting in the optimal way to convert light from being tightly to weakly confined.




  • The shape optimization allows for a minimum of on-chip space, reducing the size of the inverted tapers and the subsequent footprint.
  • We have elucidated mathematical equations so that the results can be easily applied to a variety of platforms.

Potential Applications

Silicon photonics - anytime light is being transferred on or off a chip.

Contact Information

Name: Timothy Corkery

Email: chris.corkery@mcgill.ca

Phone: 514-290-6489