Electronic Dispersion Compensation of 40-Gb/s Multimode Fiber Links Using IIR Equalization
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1 Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization George Ng & Anthony Chan Carusone Dept. of Electrical & Computer Engineering University of Toronto Canada
2 Transmitting Data Over Short Multimode Fiber Links Data transmission speed limited by intermodal dispersion Intermodal dispersion causes a wide variety of channel responses Result: Inter-symbol Interference (ISI) at receiver Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 2
3 Modal Dispersion Mitigation Two dispersion compensation methods Optical Electrical Electrical equalization advantages Low cost Adaptive Robust Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 3
4 Typical Equalizer - FIR Clockless Low power Guaranteed stability Cannot compensate spectral nulls Restricted to manipulating zeros Only cancels ISI up to length of equalizer 2 Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 4
5 Typical Equalizer - DFE Compensates spectral nulls without noise enhancement Difficult to meet timing in feedback path at high speeds Difficult timing recovery Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 5
6 IIR Equalizer Clockless Manipulate both poles and zeros Cancels ISI beyond length of equalizer More noise enhancement than DFE Possibly unstable 2 2 Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 6
7 System Simulation IIR equalization of a 5 m MMF link at 4 Gb/s Comparing the performance of a 3-Tap FIR versus a 3-Tap FF and 2-Tap FB IIR equalizer Both equalizers have T s /2 tap spacing MMF Fiber Channel NRZ Zero Average PRBS Sequence Generator Transmit Filter AWGN Receive Filter IIR Equalizer Eye Diagram Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 7
8 MMF Fiber Channel Model Statistical MMF channel model Based on restricted launch scheme at various radial offsets Model represents the performance of the worst-case 5% of installed fibers Model linearly scaled from original 3 m length to 5 m Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 8
9 IIR Coefficient Optimization IN b OUT IN b OUT b b a b 2 b 2 a 2 b n- b n Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 9
10 Definition: ISI Penalty.5 Eye Diagram Inner Eye Opening A n.5 Amplitude Outer Eye Opening A Time (ps) ISI Penalty = *log (A /A n ) Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization
11 Example Channel.7 Amplitude ps Time (ps) Channel Pulse Response Amplitude Time (ps) Unequalized Channel ISI Penalty = 2.3 db Data Dependent (DD) Jitter pp = 2.4 ps Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization
12 Equalizer Performance Magnitude Normalized Delay = T s /2 3-Tap FIR Magnitude Normalized Delay = T s /2 IIR Equalizer IN.5 OUT Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 2
13 Equalizer Performance Amplitude Time (ps) 3-Tap FIR Equalized ISI Penalty = 3.9 db DD Jitter pp =.4 ps Amplitude Eye Diagram Time (ps) IIR Equalized ISI Penalty =. db DD Jitter pp = 3.3 ps Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 3
14 Statistical Analysis ISI Penalty # Fibers um IIR 7 um FIR Total = 8 Fibers ISI Penalty [db] Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 4
15 Statistical Analysis - Jitter um IIR 7 um FIR # Fibers Total = 8 Fibers Data-Dependent Jitter pp [ps] Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 5
16 Conclusion Introduced IIR equalizer for intermodal dispersion compensation Demonstrated the effectiveness of the IIR equalizer over the FIR equalizer Statistical analysis shows that an IIR equalizer equalizes 9% of the 5 m MMF links at 4 Gb/s < 2.5 db of ISI penalty for the 5% worst case fibers < 3.75 ps of data-dependent peak-to-peak jitter Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 6
17 Questions? Electronic Dispersion Compensation of 4-Gb/s Multimode Fiber Links Using IIR Equalization 7
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