Photon Design Ltd, the global leader in photonic simulation CAD software, is delivering quantum dot (QD), laser simulation results which accurately replicate those of beta sample lasers, using its HAROLD QD modeller, during recent academic and industrial field tests. HAROLD QD enables the design and simulation of III-V, quantum dot, semiconductor lasers on silicon, a pioneering approach in the industry. Using Photon Design’s eight-band, K.P model, the QD epitaxial layer simulation balances accuracy with practical processing speed. The company’s 3D strain modelling is also included, essential in accounting for the interrelated effects of the QD lasers’ optical, electrical, and thermal characteristics, increasing simulation accuracy still further.

Dr. Dominic Gallagher, CEO of Photon Design, said, “The photonics industry expects QD lasers to play a critical role in many, next-generation, laser applications. This is due to their ease of manufacture on silicon and superior temperature, modulation and data transmission performance. Initial QD laser applications are focused on the transition to optical architectures in data centres, AI, and HPC, where they bring size, heat, and power savings.

“HAROLD QD models each quantum dot of a laser precisely, complete with a dot size distribution to replicate manufacturing tolerance, allowable or otherwise. Designers can validate production samples, informing and optimising the design and production processes, predicting precise, laser performance, or calibrating devices for testing.

“HAROLD QD is the quantum dot version of Photon Design’s long-established, HAROLD simulation tool; a mature platform with a library of material systems included for simulating various epitaxy structures. This benefits HAROLD QD and will allow users to export gain and absorption spectra results into Photon Design’s PICWave, for creating simulations of 3D devices such as modulators, amplifiers, and laser diodes.”

Professor Peter Smowton from Cardiff University's world-class, Institute for Compound Semiconductors has been actively involved in developing HAROLD QD and its field-testing.