Princeton University

School of Engineering & Applied Science

A Microwave Photonic Interference Canceller: Architectures, Systems, and Integration

Matthew Chang
Engineering Quadrangle B327
Tuesday, March 14, 2017 - 2:00pm to 3:30pm

Wireless interference, spectrum crowding, and the growing cost and complexity of existing radio infrastructure are the greatest problems facing engineers as they build the next generation of wireless communications (5G). In this talk, I present a microwave photonic self-interference canceller, an optical circuit designed to eliminate self-generated interference from radio-frequency receivers. Analogous to how fiber-optics elevated the bandwidth capabilities of wired communications, the optical circuit’s value lies in its ability to operate over bandwidths and tune over frequency ranges orders of magnitude larger than what is possible using existing wireless radio technology.
The talk will cover work spanning from 2012 to 2017, beginning with a fiber-optic version of the microwave photonic canceller and culminating with the first ever microwave photonic canceller integrated onto a single semiconductor substrate. Specifically, the talk will focus on three main areas. First, new circuit architectures developed to reduce the noise and loss of the optical circuit while simultaneously enabling it to scale better in wireless environments. Second, the testing of the the circuit in actual digital radios and wireless environments. Third, the integration of the microwave photonic canceller into a photonic integrated circuit. A single integrated circuit is able to reduce self-interference by nearly 1000x over all LTE and WiFi bands in existence today.