VPItoolkit PDK SMART is a pluggable toolkit which extends
VPIcomponentMaker Photonic Circuits by adding the support of the
InP photonics PDK for the Multi-Project Wafer MPW runs offered by
It enables the rapid design of
Indium Phosphide photonics semiconductors for their subsequent fabrication at the independent SMART Photonics foundry.
Widely Tunable Laser Source
The PIC design flow is demonstrated by simulating a widely tunable laser source, based on a design idea published in .
All the waveguide lengths are important here – not only inside each MZI, but also the total length of the whole ring laser
cavity. After designing MZIs with proper free spectral ranges (FSRs), matched with the FSR of the whole circuit, and applying
estimated voltages to all the phase modulators, one can obtain results as shown below: single-mode lasing at almost any
desired wavelength (side-lobe lines are due to not perfectly chosen voltages).
 S. Latkowski et al., Novel Widely Tunable Monolithically Integrated Laser Source, IEEE Photonics Journal, vol. 7, No. 6, 1503709 (Dec 2015).
Automatically exported layout in OptoDesigner
Simulation setup with all the building blocks and key parameters
Simulated laser spectra for different phase modulator settings