Spring 2019







Silicon photonics is a rapidly growing industry as well as an active area of advanced research. This course will focus on practical applications of advanced EM concepts to silicon photonics integrated circuits. It combines the rigorous derivation of major physical concepts like matrix optics, waveguiding, coupled mode theory, pin junctions, etc. with the applications of these knowledge towards the design of practical silicon photonic devices like passive wavelength filters, active switches and modulators for optical communications, as well as germanium photodetectors. The emphasis will be given to interaction of guided EM waves with electrical charges in pin junction that would allow to understand the operation and design principles of a new class of photonic devices (modulators, switches, photodetectors, etc.) based on carrier-injection/depletion in silicon/germanium integrated optics. Fabrication approaches and CMOS integration challenges will be reviewed. System-level analysis of short-reach and long-haul optical links will be reviewed that will drive the design considerations for optical transmitter and receiver subsystems and individual devices.

Additional credit: Up to 4 graduate hours will be given on the basis of successfully completing independent project on analysis, design and testing of the silicon photonic circuits. Designs should be completed by the tapeout date February 11. Corresponding photonic devices and circuits will be fabricated at the University of British Columbia and then automatically tested. Results of the optical measurements will be available for students by mid-March. This will give enough time to analyze the results and write a comprehensive report covering device operation principles, literature search, design approaches chosen, and analysis of the experimental results.

Time Room Instructor Office Hours Office
11:00-12:20pm, Tue Thur 3015 ECEB Yurii Vlasov (yvlasov@illinois.edu) Tue 12:30 PM 1250 MNTL

Homework TA TBA (tba@illinois.edu) Office Hours: TBD

Textbook: Mostly based on classnotes.

Supplementary Texts:
S.L.Chuang, Physics of Photonic Devices, 2nd Edition, Wiley, New York, 2009.
L. Coldren, S. Corzine, M.L. Mashanovitch , Diode Lasers and Photonic Integrated Circuits, Wiley 2nd Edition (2012)
B.E.A.Saleh and M.C.Teich, Fundamentals of Photonics, 2nd ed., Wiley, New York, 2007.

Tuesday (11:00 - 12:20) ECEB 3015

Thursday (11:00 - 12:20) ECEB 3015

1/15 L1.Introduction to integrated photonics: optical communications, short-reach and long-haul optical links, optical switching, economic drivers towards photonic integration  Slides   1/17 L2.Review of interaction of optical waves with dielectric interfaces. Boundary conditions, total internal reflection.  Slides  

HW1 assignment   HW1 solutions  

1/22 L3. Symmetric dielectric waveguides. Cutoff conditions, dispersion relation. Propagation constant and effective index. Optical confinement factor.   Slides   1/24 L4. Asymmetric dielectric waveguides. Rectangular waveguides. Marcatilli and effective index methods. Types of silicon waveguides.   Slides  

HW2 assignment   HW2 solutions  

1/29 L5. Coupled mode theory. Coupled optical waveguides. Power splitters. Mach-Zehnder interferometer.  Slides   1/31 L6.Optical ring resonators. Add-drop multiplexers. Wavelength division multiplexing..  Slides  

HW3 assignment   HW3 solutions  

2/05 L7.Cascaded MZI optical filters. Star couplers. Filters figures of merit.   Slides   2/07 L8. Computational methods for integrated photonics. Propagation matrix, finite difference time domain, eigenmode expansion. Design of waveguide structures.  

HW4 assignment   HW4 solutions  

2/12 L9. Fabrication of silicon photonics. Waveguide loss, scattering, absorption, radiation. Dispersion in optical waveguides. Bent waveguides. Adiabatic mode converters.   Slides   2/14 L10. Coupling to waveguide: edge, grating, evanescent coupling, spot-size converters. Packaging solutions and economic/functional/power constraints.   Slides  
2/19 EXAM I Take Home Exam 1   Exam 1 solutions   2/21 L11.Polarization dependence and management. Waveguide polarization splitters and rotators. Optical isolation.  Slides  

HW5 assignment   HW5 solutions  

2/26 L12.Electro-optical effects. Phase and amplitude modulators. Index modulation in silicon. Thermal phase shifter, thermo-optic switch.   Slides  

2/28 L13.Franz-Keldysh effect and FK electrooptical modulators.   Slides  

HW6 assignment   HW6 solutions  

3/05 L14. Review of PN-and PIN-junctions. Junction diode static and transient characteristics. Carrier-induced electro-optical effects   Slides   3/07 L15.Carrier-Injection phase shifter. PN-junction carrier distribution, optical phase response, small signal response. Forward biased PIN junction variable optical attenuator.   Slides 

HW7 assignment  HW7 Solutions

3/12 L16. Micro-ring modulators and switches, small-signal response, ring modulator design.   Slides   3/14 L17.Carrier-depletion phase shifter. PN-junction carrier distribution, optical phase response, small signal response.   Slides  

HW8 assignment  HW8 Solutions

3/26 L18. Traveling wave design of reverse-biased electro-optic modulator. Design tradeoffs.  Slides   3/28 L19. Signal distortion in optical waveguides, group delay. Dispersion engineering.   Notes   Slides  
4/02 EXAM II Exam 2   Exam 2 solutions   4/04 L20. Introduction to short-reach and long-haul optical communications. Modulation formats, receiver and transmitter characteristics, optical link budget, BER and penalties  Slides  

HW9 assignment  HW9 Solutions

4/09 L21. Photonic modulators: Figures of merit. Modulators for advanced modulation formats.   Slides   4/11 L22. Germanium photodetectors. Fabrication approaches. Receiver figures of merit   Slides   HW10 assignment  

HW10 Solutions

4/16 L23. III-V integration with silicon photonics. Integrated lasers and amplifiers. Transmitter figures of merit.  Slides   4/18 L24. Introduction to data center optical networks. Optical switching. Optical switches.  Slides   HW11 assignment 
4/23 L25. Optical nonlinearities in silicon waveguides. Applications of nonlinear effects in silicon photonics. Wavelength converters. Frequency comb generators.   Slides   4/25 L26. Emerging applications of Si photonics in quantum computing, neuromorphic computing, and biological sensing. Comparison of technological advantages and business models   Slides  
4/30 L27. State of silicon photonics industry. Skills and competencies.   5/02 Reading day (no class)
FINAL EXAM Wednesday 05/08/2018 8:00AM-11:00AM ECEB3015


Homework and Class Participation 20% of total
Midterm Exam I 25% of total
Midterm Exam II 25% of total
Final Exam 30% of total