Director of Research and Design
Enablence Technologies Inc.
- Large-scale planar lightwave circuits
- Coherent transmission and detection systems
- Layout optimization of complex topological maps
- Development of hybrid simulation tools for photonic/electronic circuit
Light and matter interactions always fascinated me… I dedicated much of my research to advance our ability to manipulate light.
I began by building blue and ultra-violet laser diodes to boost optical storage capacity. I continued with advancing modeling tools for planar lightwave circuits and am currently melding optics and electronics into large-scale integrated chips.
I hope that one day we would be able to use the advancement in information storage and transfer to improve quality of life.
- Photonic Components and Devices
- Optical Communication Systems
- Silicon Photonics Components / Devices and Integrated Circuits
- Nano photonics
Dr.Tewari completed his Ph.D at the Indian Institute of Technology Dehli, followed by postdoctoral work at the Technical University of Berlin in the area of fiber optics and photonics. He has developed a novel technique to design Advanced Optical Fibers based on “Spot Size Definitions”.
He is a former research, technical and business development consultant for RSOFT Design Group Inc. and Simphotek Inc. where he was involved in simulation and demonstration of several photonic structures such as surface Plasmon modes in silicon waveguides, simulation of silicon cross-slot waveguides, simulation of the carrier-induced index effects in a silicon on Insulator (SOI) ridge waveguides, simulation of electro-optic effects in Mach-Zehnder modulators, designing mode converter for silicon on insulator (SOI) structures, simulation of ARROW and hollow-core waveguides and modeling gratings using bidirectional BPM.
He has been the VP Technology at CodeSScientific since 2015, where he has collaborated in developing OCSim modules for design and simulation of modern fiber optic communication systems as well as the designs of mode fibers.
Research and Financial Administrative Assistant
Tel: 613 562 5800 ext. 7217
- Silicon Photonics
- Nano photonics,
- Photonic Crystal,
- Optical switching
Current studies involve a planar metamaterial Lüneburg lens enables Fourier optics on-a-chip:
It can be implemented in an SOI slab waveguide structure by patterning the silicon core with variable sized holes which subwavelength patterning of binary nanocomposite material form the metamaterial. This structure offers the advantage of fabrication by a single etch step while demanding feature sizes that can be accessed by deep UV lithography in addition to e-beam lithography. The concept and designs were verified by the 2D FDTD simulation of a two lens telescope system and a 3D FDTD simulation of the same two lens telescope system predicts a low loss of -0.83 dB. This structure can be used in optical transpose interconnection systems in optical switching architectures with the advantage of avoiding large number crossover waveguides in optical communication systems.
- Nikkhah, H., Benhsaien, A., Maldonado-Basilio, R., Abdul-Majid, S., Hall, T. J., “Metamaterial Lüneburg waveguide lenses for switch fabric on-a-chip applications,” Proc. SPIE 8915, 89150O (2013)
- H. Nikkhah, T. J. Hall, ‘A transpose optical interconnect utilising metamaterial Luneburg waveguide lenses for switch fabric on-a-chip applications’, SPIE Photonics West, San Francisco, United States, 2-7 February 2013, Proc. SPIE, 8627, 86270V-1 (9 pages).
- R. Maldonado-Basilio, R. Li, S. Abdul-Majid, H. Nikkhah, K. W. Leong, T. Hall, ‘Effect of the degree of phase-correlation of laser sources on the transmission and optical coherent detection in radio-over-fibre systems’, SPIE Photonics West, San Francisco, United States, 2-7 February 2013, Proc. SPIE 8645, pp. 86450E-1/10.(10 pages)
- H. Nikkhah, K. Van Acoleyen, R. Baets, ‘Beam steering for wireless optical links based on an optical phased array in silicon’, Annals of Telecommunications, Springer, (online since June 2012), 68, (1-2), February 2013, pp 57-62.
- Trevor J. Hall, Ramón Maldonado-Basilio, Sawsan Abdul-Majid, Joe Seregelyi, Ran Li, Irene Antolín-Pérez, Hamdam Nikkhah, Frédéric Lucarz, Jean-Louis de Bougrenet de La Tocnaye, Bruno Fracasso, Patrice Pajusco, Camilla Kärnfelt, Daniel Bourreau, Michel Ney, Rabiaa Guemri, Yves Josse, Hexin Liu, ‘Radio-over-Fibre Access for Sustainable Digital Cities’, Annals of Telecommunications, Springer, 2013, 68(1-2), pp. 3-21.
- H. Nikkhah, Q. Zheng, I. Hassan, S. Abdul-Majid, T. J. Hall, ‘The Free Space and Waveguide Talbot Effect: Phase Relations and Planar Light Circuit Applications’, Photonics North 2012, Montreal, Canada, June 2012, Proc. SPIE 8412, 2012, art. 841217
- H. Nikkhah, R. Baets, K. Van Acoleyen: ‘Optical Phased Arrays in Silicon on Insulator for Optical Wireless Systems’, Green Radio over Fibre and all-optical Wireless Technologies for Wireless Access Networks’, Brest, France, 15-17 June 2011.
Mehedi Hasan started his career as an academician by joining at Military Institute of Science and Technology, Bangladesh as a “Lecturer” in 2009. Prior to that, in the same year he completed bachelor in Electrical, Electronic and Communication Engineering from the same university. Then he completed M. A. Sc. in Electrical and Computer Engineering from University of Ottawa, Canada in 2015. In the same year, he has started Ph.D. at center for Research in Photonics, University of Ottawa under the supervision of Professor Trevor Hall after he has been awarded International Admission Scholarship for four years. His research currently focuses on the modeling and design of photonic integrated circuit for energy efficient and sustainable next generation network.
- M. Hasan, J. Hu, H. Nikkah and T. J. Hall,“ A photonic circuit for complementary frequency shifting, in-phase quadrature/single sideband modulation and frequency multiplication: analysis and integration feasibility,” Journal of Modern Optics (Online).
- M. Hasan, T. J. Hall, “Comments on Xuan Li, Shanghong Zhao, Zihang Zhu, Bing Gong, Xingchun Chu, Yongjun Li, Jing Zhao and Yun Liu ‘An optical millimeter-wave generation scheme based on two parallel dual-parallel Mach–Zehnder modulators and polarization multiplexing,” Journal of Modern Optics (Online).
- T. J. Hall and M. Hasan, “Universal discrete Fourier optics RF photonic integrated circuit architecture,” Optics Express 24(7), (2016).
- M. Hasan, and T. J. Hall, “Rebuttal to Photonic Microwave Generation with Frequency Octo-tupling based on a DP-QPSK Modulator,” IEEE Photonic Technology Letters 28(16),1794 (2016).
- M. Hasan, and T. J. Hall, “A photonic frequency octo-tupler with reduced RF drive power and extended spurious sideband suppression,” Optics and Laser Technology 81, 115-121(2016).
- M. Hasan, R. Guemri, R. Maldonado-Basilio, F. Lucarz, J-L de Bougrenet and T. J. Hall, “Photonic integrated circuit for frequency 8- and 24-tupled millimeter wave signal generation: erratum,” Optics Letters 40(24), 5710 (2015).
- M. Hasan, and T. Hall, “Cascade photonic integrated circuit architecture for electro-optic I-Q / SSB modulation or frequency conversion,” Optics Letters 40(21), 5038-5041(2015).
- M. Hasan, and T. Hall, “A photonic circuit for high order USB and LSB separation for remote heterodyning: simulation and analysis” Optics Express 23(19), 25259-25271 (2015).
- R. Maldonado-Basilio, M. Hasan, R. Gumeri, F. Lucarz, T. J. Hall, “Generalized Mach–Zehnder interferometer architectures for radio frequency translation and multiplication: Suppression of unwanted harmonics by design,” Optics communication 354, 122-127 (2015).
- R. Maldonado-Basilio, M. Hasan, H. Nikkah, S. Abdul-Majid, R. Gumeri, F. Lucarz, J-L. de Bougrenet and T. J. Hall, “Electro-optic up-conversion mixer amenable to photonic integration,” Journal of Modern Optics 62(17), 1405-1411 (2015).
- M. Hasan, R. Maldonado-Basilio, and T. J. Hall, “Dual-function photonic integrated circuit for electro optic frequency multiplication or single-side-band modulation,” Optics Letters 40(11), 2501 (2015).
- M. Hasan, R. Maldonado-Basilio, T. J. Hall, “Comments on X. Yin, A. Wen, Y. Chen, and T. Wang, ‘studies in an optical millimeter-wave generation scheme via two parallel dual-parallel Mach-Zehnder modulators,” Journal of Modern Optics 62(7), 581-583 (2015).
- M. Hasan, R. Guemri, R. Maldonado-Basilio, F. Lucarz, J-L de Bougrenet and T. J. Hall, “Photonic integrated circuit for frequency 8- and 24-tupled millimeter wave signal generation,” Optics Letters 39(24), 6950 (2014).
- I. Baqee, M. Hasan, K. K. Das, M. U. Saad, S. Serraji, “A Neural Network-based Face Recognition Method by Illumination Normalization & Edge Detection,” Journal of Applied Engineering Research 6(17), 2069-2077(2011)
Publications (Conference Proceedings):
- M. Hasan, D. Sun, P. Liu and T. J. Hall, “Towards a universal RF photonic integrated circuit architecture for microwave applications,” 37th Progress in Electromagnetics Research Symposium (PIERS), Shanghai, China 8-11 August (2016).
- T. J. Hall and M. Hasan, “Universal photonic integrated circuit architecture: the discrete Fourier transform case,” Photonics North, Montreal, Canada (2016).
- R. Maldonado-Basilio, N. Nabavi, K. Aulakh, M. Hasan, and T. J. Hall, ‘Photonic Integrated Circuit for Millimeter-Wave Signal Generation by Frequency Multiplication’, IEEE Photonics Conference, Hyatt Regency Reston, Reston, Virginia USA ,4 – 8 October 2015.
- I. Jahangir, D. M. N. Hasan, S. Islam, N. A. Siddique, M. Hasan, “Development of a novel quaternary algebra with the design of some useful logic blocks,” – In proceedings of 12th International Conference of Computer and Information Technology, Dhaka, Bangladesh, pp. 197-202 (2009).
- I. Jahangir, D. M. N. Hasan, S. Islam, N. A. Siddique, M. Hasan, “Design of quaternary sequential circuits using a newly proposed quaternary algebra,” – In proceedings of 12th International Conference of Computer and Information Technology, Dhaka, Bangladesh, pp. 203-208 (2009).
Dr. DeGui received his B.S. degree in optical engineering in 1985 from the Harbin Institute of Technology, China, and in 1988 and 1993 he respectively earned his Master and Ph.D degrees in nonlinear optics and applications from the Chinese Academy of Sciences (CAS) at Changchun Institute of Optics and Fine Mechanics. In 1991, 1993 and 1994, he received the second-level prize of the CAS President Scholarship, the third-level award of natural science research of the CAS and the Young Scientist Award of Jilin Province, respectively. From August 1994 to March 1998, he was a postdoctoral fellow in the Microelectronics Research Centre, University of Texas at Austin, USA, where he started his research in field of optical waveguide optical switches and modulators. From 1998 to the end of 2001, he ever worked in an Ottawa-based start-up – Zenastra Photonics for developing the products of integrated optical components for communications; from January 2002 to July 2003, as research associate and group leader he worked in the Faculty of Engineering at Northwestern University, USA; and from 2003 to end of 2006 he executed his “100-Talent-Plan” Project of the CAS entitled by “research on advanced components for optical communications” at Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP). Since 2008 he has been joining the Centre for Research in Photonics at uOttawa where he was ever project director, the co-founder and Chief Scientist of a startup company– D&T Photonics (DTP) spun-off from uOttawa, and he is also a visiting professor in uOttawa, Canada, and an invited professor of Changchun University of Science and Technology (CUST), China. At his current position, he has obtained the excellent achievements in both science research and product development.
Since 2009, in the silicon photonic integrated switching devices, and the ferroelectric crystal waveguide EO modulators and newly opened EO electric-field sensors, he has published more than 20 papers in erudite journals, more than 20 articles in conference proceedings including recent 3 invited speeches, he obtained 1 US patent and 1 China patent, and has 2 invention announcements, he ever revised one chapter for his friend’s book. Currently, he is an IEEE member, the member of Editorial Board of the AASCIT Journal of Materials Sciences and Applications and the reviewers of several journals in photonics, the program chairs and reviewers of several international conferences
- D. G. Sun, ‘Manipulation of the coherent spatial and angular shifts of Goos-Hänchen effect to realize the digital optical switch in SOI waveguide corner’, J. Appl. Phys. 120(18), 183101 (2016).
- J. Wang, D. G. Sun et al., “Improved silica-PLC MZI-type optical switches with error dependence compensation of directional coupler,” Opt. Las. Technol. 89(2), 208-213 (2017).
- . G. Sun, et al., ‘Theoretical feasibility demonstration for over 100GHz electro-optic modulators with c-axis grown BaTiO3 crystal thin-films’, J. Lightw. Technol. 33(10), 1937-1947 (2015).
- D. G. Sun, “A proposal for digital electro-optic switches with FCD effect and Goos-Hanchen shift in silicon-on-insulator waveguide corner mirror,” J. Appl. Phys. 114(10), 104502 (2013).
- D. G. Sun, X. Fu, T. J. Hall, and H. Jiang, “Analysis for the nonlinear electro-optic modulation effect of BaTiO3 crystal thin-film waveguide modulators,” J. Appl. Phys. 113(18), 184502 (2013).
- D. G. Sun, X. Fu, and H. Jiang, “Simulations for dual-rail driven electro-optic modulators of BaTiO3 crystal thin-film waveguides,” Optics Communications 301/302, 152-158 (2013).
- D. G. Sun, T. J. Hall et al., “Experimental comparison of optical loss between the silicon-on-insulator waveguide corner mirrors and curves,” Int. J. Eng. Adv. Technol. 3(2), (2013).
- ZHANG J, FU X., SUN D.-G., et al., “Design and fabrication of BaTiO3 crystal thin-film waveguides,” Acta Photonica Sinica (A China Journal, EI indexed), 42(01), 1-5 (2013).
Publications (Conference Proceedings):
- D. G. Sun et al., “Linear and nonlinear EO modulations of BaTiO3 crystal thin-films for realizing the ultrahigh bandwidth optical modulators,” (Invited), the 37th Progress in Electromagnetics Research Symposium (PIERS), Proc. pp4615-4618, Shanghai, China, 8-11 Aug. 2016.
- D. G. Sun, “Modeling and simulations for ultrafast digital optical switches with quantum photonic theory and submicron-scale Si-photonic technology,” (Invited), the Energy Materials Nanotechnology (EMN) on Quantum Technology, Beijing, China, 14-17 April 2015.
- D. G. Sun, “Control of the reflected guided-mode at SOI waveguide corner with an interface modulation scheme of optical effective refractive index based on FCD effect,” (Invited), the 1st Annual World Congress of Smart Materials Processing, Busan, Korea, 23-25 March 2015.
- D. G. Sun et al., “Realization of large reflective surface of silica-waveguide turning corner with strategic deep-trenching,” the 37th PIERS, Shanghai, China, 8-11 Aug. 2016.
- M. Hasan, D. G. Sun, P. Liu, and T. J. Hall, “Toward to high-frequency I-Q modulators,” the 37th Progress in Electromagnetics Research Symposium, Shanghai, China, 8-11 Aug. 2016.
- D. G. Sun, “Optic-sensing to all-directional weak electrical signals with dual-rail driven electro-optic modulation scheme of BaTiO3 crystal thin-film waveguides,” the 3rd Int. Conference on Biomedical Engineering and Biotechnology (iCBEB2014), Beijing, China, 25-28 Sept. 2014.
- D. G. Sun et al., “Realization for the high EO modulation depth of SOI waveguide devices,” the Int. Conference on Control Eng.&Inf. Technology, Proc.700-703, Nanning, China, 9-11 Aug. 2013.
- D. G. Sun et al., “Optimization for electro-optic modulation efficiency of silicon-on-insulator waveguide devices with an adjustable pn-junction,” the 10th Int. Conference on Group IV Photonics (the 10th GFP2013), Seoul, Korea, 28-30 Aug. 2013: IEEE Proc. 45-46.