Our Photonic Integrated Circuits are based on silicon-nitride based waveguides. Our proprietary waveguide concept is called TriPleX technology. It has the lowest propagation losses reported for silicon nitride waveguides (0.1 dB/cm down to 0.1 dB/m). It operates in a broad wavelength band ranging from 405 nm to 2350 nm. Furthermore we have developed a patented tapering method that converts low contrast modes for optimal fiber coupling, to high contrast modes for small bending radii.
The TriPleX waveguide comes in a few family members of cross sections as is shown in the figure left. The cross sections range between box shapes, single stripe, and double stripes. The latter coming in two forms; the symmetric double stripe and the asymmetric double stripe (ADS). Finally the TriPleX family has a burried waveguide for very thick nitride layers.
Each of these cross sections have different properties optimized for use in a specific application: The ADS cross section is our workhorse at 1550 nm applications and is offered as well via our MPW. The losses of this waveguide are < 0.1 dB/cm and with the taper the fiber coupling losses are below 0.5 dB per facet. The single stripe version of TriPleX is used for ultra low loss applications (losses as low as 0.1 dB/meter) or in applications in the visible light domain. In the visible domain the single stripe is optimized for fiber coupling as well low loss propagation of the wavelengths between 405 to 700nm.