1. School
of Electrical Engineering and Computer Science, University of Ottawa, 800 King Edward Avenue, Ottawa, Ontario K1N 6N5, Canada
2. Centre
for Research in Photonics, University of Ottawa, 25 Templeton Street, Ottawa, Ontario K1N 6N5, Canada
3. Department
of Physics, University of Pavia, Via Bassi 6, Pavia, Italy
4. Department
of Electronics, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada
5. Department
of Physics, University of Ottawa, 151 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada