Ph.D. Orals - Wednesday (08/22) 10:00 AM

Onur Fidaner ofidaner at
Fri Aug 17 10:14:29 PDT 2007

Stanford University Ph.D. Oral Examination

Photonic Integration for Interconnects: from Chip-scale to Long Distance

Onur Fidaner

Research Advisor: Professor David A. B. Miller

Department of Electrical Engineering

Location: Center for Integrated Systems Extension (CIS-X) Auditorium
Date:  Wednesday, August 22, 2007
Time:   10:00 AM (Refreshments served at 9:45 AM)


Photonics technology has been widely used in long-haul optical  
networks and it is now considered as an alternative to electrical  
interconnects in CMOS chips because electrical interconnects cannot be  
scaled for fundamental reasons.  In this talk I will explain two  
different technologies for optical interconnects, at two very  
different distance scales.  The first one is an InP-based integrated  
photonic switch that can be used in multifunctional and reconfigurable  
optical network nodes.  The second technology is an optical link on  
silicon employing Ge/SiGe quantum well modulators and detectors on  
silicon.  Both of these technologies monolithically integrate multiple  
photonic components on the same chip to improve performance and reduce  

The first technology offers a photonic integration platform on III-V  
substrates.  We demonstrate a photonic switch that intimately  
integrates quantum-well electroabsorption modulators with  
photodetectors such that the detectors directly drive the modulators.   
Such an intimate integration provides a compact  
optical-electronic-optical (o-e-o) conversion and eliminates the  
necessity of propagating high-speed electrical signals in cascaded  
discrete electronic and photonic components.  These switches offer  
multiple network functions such as wavelength conversion, electrical  
packet switching, and optical packet switching.

The second technology utilizes the recently discovered strong  
quantum-confined Stark effect (QCSE) in germanium - silicon germanium  
quantum well structures, which can be grown on silicon substrates.   
QCSE offers an efficient physical mechanism to make CMOS-integrated  
electroabsorption modulators.  In this talk I will describe the first  
waveguide electroabsorption modulators and photodetectors using  
Ge/SiGe quantum well system.  In particular, I will demonstrate the  
first optical link on silicon using the quantum well technology.

More information about the labmembers mailing list