High-speed transistor-VCSELs for Optical Communications
The goal of this proposed project is to develop a revolutionary semiconductor laser transmitter technology, based on the homogeneous integration of photonics and electronics. The new device, a TX-VCSEL, is the integration of a high frequency Heterojunction Bipolar Transistor (HBT) with a Vertical Cavity Surface Emitting Laser (VCSEL).
In this project, we are modelling and designing transistor-VCSELs (using Crosslight Inc. CAD tools), fabricating 980 nm TX-VCSELs, developing high-speed driver electronics (with PMC-Sierra Inc.), and developing a high-speed packaging strategy (with Versawave Inc.).
This project is a collaboration between the research groups of Drs. Lukas Chrostowski, Nick Jaeger, David Pulfrey, and David Plant (McGill University).
This research project is aimed at developing devices that will increase the capacity of optical communication networks, which will enable future growth in new network-intensive applications. With the demand for communications continuously increasing, optical networks will need to be even more ubiquitous than they are today. Achieving this goal will require integrated photonic and electronic devices and systems that are low cost, small sized and high bandwidth. Such devices will then enable optics to penetrate further into important communication networks: fiber-to-the-home (FTTH), local and wide area networks (LAN, WAN), machine-to-machine connectivity, and wireless signal distribution. Eventually, our devices will find their way into emerging areas where optical interfaces are required: backplane communications (e.g. between CPU and memory) and inter-chip communication (e.g. between the multiple CPU cores).
These applications call for the development of low-cost semiconductor laser transmitters with much higher performance (>40 GHz operation) than presently available. The goal of this proposed project is to develop a revolutionary semiconductor laser transmitter technology, based on the homogeneous integration of photonics and electronics. The new device, a TX-VCSEL, is the integration of a high frequency Heterojunction Bipolar Transistor (HBT) with a Vertical Cavity Surface Emitting Laser (VCSEL). The TX-VCSEL will be heterogeneously integrated with driver electronics. This will result in a very small and a very high-frequency optical transmitter.
We have established a model in Crosslight PICS3D, which allowed us to discover a new optical saturation effect in the transistor-VCSEL, which allows for voltage control, versus current control . We have also developed an analytic model for the small-signal modulation of the transistor laser .