lecture21_ee689_optical_io

lecture21_ee689_optical_io - ECEN689: Special Topics in...

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Sam Palermo ECEN689: Special Topics in High-Speed Links Circuits and Systems Spring 2011 Lecture 21: Optical I/O
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Announcements Exam 2 is on Friday April 29 Comprehensive, but will focus on lectures 11 and later 60 minutes Bring your calculator Lab solutions and last years exam posted on website No class next Monday or Tuesday Final Project Report Due Tuesday by 5PM Email me a soft copy of your report Project Presentations Tuesday May 10, 8-10AM Email me your presentation by 7AM 2
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Agenda Electrical Channel Issues Optical Channel Optical Transmitter Technology Optical Receiver Technology Optical Integration Approaches 3
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High-Speed Electrical Link System 4
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5 Channel Performance Impact
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Link with Equalization 6 Serializer D TX [N:0] TX Clk Generation (PLL) TX FIR Equalization RX Clk Recovery (CDR/Fwd Clk) Σ RX CTLE + DFE Equalization Deserializer D RX [N:0] Channel f
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7 Channel Performance Impact
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High-Speed Optical Link System 8 Optical Channel Optical interconnects remove many channel limitations Reduced complexity and power consumption Potential for high information density with wavelength-division multiplexing (WDM)
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Optical Channels Short distance optical I/O channels are typically either waveguide (fiber)-based or free-space Optical channel advantages Much lower loss Lower cross-talk Smaller waveguides relative to electrical traces Potential for multiple data channels on single fiber via WDM 9
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Waveguide (Fiber)-Based Optical Links Optical fiber loss is specified in dB/km Single-Mode Fiber loss ~0.25dB/km at 1550nm RF coaxial cable loss ~100dB/km at 10GHz Frequency dependent loss is very small <0.5dB/km over a bandwidth >10THz Bandwidth may be limited by dispersion (pulse-spreading) Important to limit laser linewidth for long distances (>1km) 10 n 2 n 1 core cladding For TIR: n 1 > n 2 Optical Fiber Cross-Section [Sackinger]
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Free-Space Optical Links Free-space (air or glass) interconnect systems have also been proposed Optical imaging system routes light chip-to-chip 11 [Gruber]
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This note was uploaded on 01/01/2012 for the course ECEN 689 taught by Professor Enjeti during the Spring '07 term at Texas A&M.

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lecture21_ee689_optical_io - ECEN689: Special Topics in...

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