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ECEG287 Optical Detection Course Notes Part 14: SNR Analysis

ECEG287 Optical Detection Course Notes Part 14: SNR Analysis. Profs. Charles A. DiMarzio and Stephen W. McKnight Northeastern University, Spring 2004. SNR Layout for Direct Detection. Filter. Amp. Preamp. P s. BPF. P BKG. Johnson. Johnson. Direct-Detection SNR Summary.

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ECEG287 Optical Detection Course Notes Part 14: SNR Analysis

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  1. ECEG287 Optical Detection Course NotesPart 14: SNR Analysis Profs. Charles A. DiMarzio and Stephen W. McKnight Northeastern University, Spring 2004 Charles A. DiMarzio, Northeastern University

  2. SNR Layout for Direct Detection Filter Amp Preamp Ps BPF PBKG Charles A. DiMarzio, Northeastern University

  3. Johnson Johnson Direct-Detection SNR Summary Direct 1MHz Direct 1GHz 0 Sig Sig -10 -20 -30 -40 -50 -60 Quantum -70 D* -80 300K Bkg -90 Quantum Sunlit Bkg -100 D* -110 300K Bkg -120 Charles A. DiMarzio, Northeastern University Sunlit Bkg

  4. SNR Layout for Coherent Detection PLO Filter? Amp Preamp Ps BPF PBKG Charles A. DiMarzio, Northeastern University

  5. Johnson Johnson Johnson SNR Summary Direct 1MHz Coherent 1GHz Coherent 100kHz Direct 1GHz 0 Sig Sig -10 Sig Sig -20 -30 -40 -50 Quantum -60 Johnson Quantum -70 D* D* -80 300K Bkg 300K Bkg -90 Quantum Sunlit Bkg Sunlit Bkg -100 Quantum D* 300K Bkg -110 300K Bkg Sunlit Bkg -120 Charles A. DiMarzio, Northeastern University Sunlit Bkg

  6. Detection Statistics • Determine Probability Density Distributions • Noise • Signal with Noise • Assume a Threshold, t • Calculate Probability of False Alarm, Pfa • Calculate Probabiliity of Detection, Pd • Plot Pdvs.Pfa, Varying t Charles A. DiMarzio, Northeastern University

  7. Incoherent Noise Statistics Charles A. DiMarzio, Northeastern University

  8. Incoherent Signal Statistics SNR=4 SNR=9 Charles A. DiMarzio, Northeastern University

  9. Incoherent Detection Statistics Charles A. DiMarzio, Northeastern University

  10. Coherent Detection • Field Statistics • Complex Gaussian • Zero Mean • Real and Imaginary Parts Uncorrelated • Magnitude of the Field • Rayleigh • Power • Negative Exponential Charles A. DiMarzio, Northeastern University

  11. Coherent PDF’s Charles A. DiMarzio, Northeastern University

  12. Coherent Signal Statistics SNR=4 coh Noise SNR=9 inc SNR=9 coh SNR=4 inc SNR=4 coh Charles A. DiMarzio, Northeastern University

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