1. Department of Electrical and Computer Engineering, McGill University, Montréal, Quebec H3A 0E9, Canada
2. Department of Electronics, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada
3. School of Electrical Engineering and Computer Science, University of Ottawa, Ontario K1N 6N5, Canada; Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada; and Centre for Research in Photonics at the University of Ottawa, Ottawa, Ontario K1N 6N5, Canada