Profs. Charles A. DiMarzio and Stephen W. McKnight

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Presentation transcript:

ECEG287 Optical Detection Course Notes Part 12: More on Coherent Detection Profs. Charles A. DiMarzio and Stephen W. McKnight Northeastern University, Spring 2004 February 2004 Charles A. DiMarzio, Northeastern University

Charles A. DiMarzio, Northeastern University Overview Circuit Components Splitters Mixers Filtering Wavefront Matching Mixing Efficiency Mixing in a Photo-Refractive Crystal February 2004 Charles A. DiMarzio, Northeastern University

Charles A. DiMarzio, Northeastern University Splitter R=? R=? R0 A R0 R=? Input R0 B February 2004 Charles A. DiMarzio, Northeastern University

Mixer Signal In Large LO Out from http://www.minicircuits.com/application.html February 2004 Charles A. DiMarzio, Northeastern University

Charles A. DiMarzio, Northeastern University Filters Signal Filter LO (Ref) f f February 2004 Charles A. DiMarzio, Northeastern University

Charles A. DiMarzio, Northeastern University Wavefront Matching Mismatched in Position Mismatched in Angle February 2004 Charles A. DiMarzio, Northeastern University

Mixing Efficiency Calculate the integrals at any position, provided that the limits are infinite. Even calculate at the target! February 2004 Charles A. DiMarzio, Northeastern University

Charles A. DiMarzio, Northeastern University Back-Propagation Laser Laser February 2004 Charles A. DiMarzio, Northeastern University

SNR for Coherent Detection Incoherent Target Integrate at Target Perfect Mixing: February 2004 Charles A. DiMarzio, Northeastern University

Charles A. DiMarzio, Northeastern University Speckle Issues Random Speckle Pattern Random Phase Random Amplitude Laser February 2004 Charles A. DiMarzio, Northeastern University

Speckle Matching with a Photorefractive Crystal Reference Signal February 2004 Charles A. DiMarzio, Northeastern University

Charles A. DiMarzio, Northeastern University Hologram Generation Reference Signal February 2004 Charles A. DiMarzio, Northeastern University

Charles A. DiMarzio, Northeastern University Hologram Playback Reference Signal February 2004 Charles A. DiMarzio, Northeastern University

Charles A. DiMarzio, Northeastern University PRC Playback Wrong Direction Reference Signal February 2004 Charles A. DiMarzio, Northeastern University

Temporal Issues Reference Signal For Small A The PRC response is slow compared to f(t), so G applies only to the first term. Signal February 2004 Charles A. DiMarzio, Northeastern University

Speckle Matching with a Photorefractive Crystal Reference i.e. mix the signal with a wave that has the signal shape and the reference time dependence Signal February 2004 Charles A. DiMarzio, Northeastern University

Coherent Detection Summary Approach Strong Reference Beam with Stable Phase Good News: Enhanced Signals Enhanced Photon Noise Phase Information Improved Dynamic Range Bad News More Complicated Optics More Complicated Electronics Higher Frequencies? Need for Wavefront Matching Other Issues Polarization Beamsplitting Losses February 2004 Charles A. DiMarzio, Northeastern University

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