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Compensating Multimode Fiber Dispersion Using Adaptive Optics

This research explores the application of adaptive optics to mitigate modal dispersion in multimode fiber systems. Joseph M. Kahn and collaborators from Stanford University demonstrate techniques to enhance signal transmission by optimizing data recovery through adaptive algorithms. The study focuses on experimental setups involving spatial light modulators, Fourier lenses, and clock recovery mechanisms that effectively reduce inter-symbol interference (ISI). This work contributes to improving high-speed communication systems by addressing challenges associated with multimode fiber optics.

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Compensating Multimode Fiber Dispersion Using Adaptive Optics

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  1. Compensating Multimode Fiber Dispersion Using Adaptive Optics Joseph M. Kahn Stanford UniversityDepartment of Electrical Engineering www-ee.stanford.edu/~jmk

  2. Acknowledgments Collaborators • J. P. Wilde • S. P. Boyd • S. Fan • M. A. Horowitz • I. Lyubomirsky (Infinera Corporation) • D. F. Welch (Infinera Corporation) Graduate Students • R. A. Panicker • M. Bagher Shemirani • X. Shen • E. Alon (now at UC Berkeley) • V. Stojanovic (now at MIT)

  3. Fourier Lens Iout(t) Photo-Detector AdaptiveAlgorithm Clock & DataRecovery Rec.Data Multimode Fiber Spatial LightModulator Iin(t) ISIEstimation Trans.Data OOKModulator ISI ObjectiveFunction Transmitter Receiver Low-Rate Feedback Channel +0.8 +0.4 Modal Dispersion Compensation Using Adaptive Optics +0.1 -0.3

  4. Experimental Setup X. Shen, J. M. Kahn and M. A. Horowitz, Optics Letters, vol. 30, no. 22, pp. 2985-2987, Nov. 15, 2005.

  5. 11 km, Worst SOP, 10 mm Offset Launch,Before Adaptation

  6. 11 km, Worst SOP, 10 mm Offset Launch,One Iteration Using Step Training Sequence

  7. 11 km, Worst SOP, 10 mm Offset Launch,After One Iteration Using Step Training Sequence

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