Lecture_8-IFC_Teleseminar-1_10-JSH

Lecture_8-IFC_Teleseminar-1_10-JSH - 2/2/10 1 SRC...

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Unformatted text preview: 2/2/10 1 SRC Connectivity Teleseminar, 1/28/10 JSH 1 Connectivity Center QUANTUM-CONFINED STARK EFFECT AND HIGH-SPEED MODULATION IN Ge/ SiGe QUANTUM WELLS ON Si SRC Connectivity Seminar, January 28, 2010 SRC Connectivity Teleseminar, 1/28/10 JSH 2 Connectivity Center Outline Introduction Quantum Confined Stark Effect (QCSE) Ge/SiGe QCSE Electroabsorption Modulator SiGe Growth and Characterization Device Fabrication and Measurement Optical Characterization New Directions Summary 2/2/10 2 SRC Connectivity Teleseminar, 1/28/10 JSH 3 Connectivity Center On-chip Interconnects LOW COST, LOW POWER, INTEGRATED, CMOS COMPATIBLE, OPTICAL TRANSCEIVERS ITRS Roadmap 2005 Global interconnects Local connects CMOS device RC limited Process Technology Node (nm) 250 190 130 90 66 45 32 100 10 1 100 Relative Delay Gate Delay FO = 4 Local Global WO Repeaters Global W Repeaters What is required to solve this challenge? SRC Connectivity Teleseminar, 1/28/10 JSH 4 Connectivity Center Processor Architecture Change Multiple cores on a chip are already available Trend: increase # of cores NOT speed or complexity Parallel architectures increased bandwidth Nanophotonic communication is a credible solution D. Fattal & M. Fiorentino HP Labs 2/2/10 3 SRC Connectivity Teleseminar, 1/28/10 JSH 5 Connectivity Center Communications Challenge Broadway, New York City, 1887 Intel Microprocessor, 2005 SRC Connectivity Teleseminar, 1/28/10 JSH 6 Connectivity Center Photonic Integrated Circuit-1993 Soref, Proc. IEEE, 1687 (1993) Waveguide architecture with butt coupled fibers III-V edge emitting lasers, modulators, detectors and high-speed electronics (HBT or HEMT) All off-chip and Mostly III-V devices 2/2/10 4 SRC Connectivity Teleseminar, 1/28/10 JSH 7 Connectivity Center Reasonably developed past 5 years by Intel and Luxtera M. Paniccia, www.intel.com 1) Integrated Light Source 2) Guide Light 3) Modulation 6) Intelligence 4) Photo-detection 5) Low Cost Assembly Si Based Photonic Circuits Better Options SRC Connectivity Teleseminar, 1/28/10 JSH 8 Connectivity Center There are many possible confgurations oF modulators based on changing either the reFractive index or absorption ReFractive index modulators rely on changing the optical path length by approximately halF a wavelength Index change due to change in reFractive index (electro-optic eFFect) by changing the Free carrier concentration-either depletion in reverse bias or injection in Forward bias Modulate the phase Modulate the amplitude Absorptive modulators rely on changing absorption due to an applied electric feld and shiFt in eFFective bandgap ranz-Keldysh eFFect (bulk) Quantum-Confned Stark EFFect (QCSE) (quantum wells) Optical Modulators 2/2/10 5 SRC Connectivity Teleseminar, 1/28/10 JSH 9 Connectivity Center Changing relative length of one arm destroys constructive interference in fundamental mode of guide, leading to higher order mode that does not propagate in the guide...
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This note was uploaded on 06/05/2010 for the course EE 243 taught by Professor Harris,j during the Winter '10 term at Stanford.

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Lecture_8-IFC_Teleseminar-1_10-JSH - 2/2/10 1 SRC...

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