Spot-Size converter

Schematic of the spot-size converter (left) and expanded field at the input of the PIC (right).


The spot-size converter (SSC) couples light from a source (free-space or fiberized) to a photonic integrated circuit (PIC) which lies in the same plane of the source (horizontal coupling). This configuration is generally called end-fire coupling or butt-coupling.

The working principle consists in mode-matching between the source output and the SSC input to maximize the coupling efficiency. In the configurations proposed, the spot-size converter is based on a slab waveguide (WG) which transitions adiabatically to a fully etched single mode WG. For deployment in applications requiring large bandwidth, low insertion loss or the need of coupling directly to the laser output.


  • Broadband
  • Low insertion loss
  • Compatible with free-space coupled light sources with modal area ~ 8 µm2 (4.7 x 1.7 µm2) near 3.4 µm

On going

  • Improving insertion loss performance

Upcoming Events

  1. Pilot Lines Webinar on Ramping up the production of photonic devices

    December 14 @ 3:00 pm - 4:30 pm
  2. Meet MIRPHAB at Photonics West during February 2019

    February 2, 2019 @ 8:00 am - February 7, 2019 @ 5:00 pm
  3. Pilot Lines Executive Breakfast at Photonics West 2019

    February 5, 2019 @ 7:30 am - 10:00 am