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  • 1
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    Channel simulation for optical communication systems (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A technique is reported for simulating the signal fading that will be experienced by typical optical communication systems. The desired irradiance or amplitude fading statistics can be simulated by incorporating a linearized optical modulator subsystem between the transmitter and receiver. This technique has been implemented in the design and construction of a laboratory channel simulator. The design of the processing electronics is discussed along with the results of tests performed for each mode of operation.
    Keywords: COMMUNICATIONS
    Type: Applied Optics; 13; June 197
    Format: text
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  • 2
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    Optical communication system performance with tracking error induced signal fading. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: System performance is determined for an optical communication system using noncoherent detection in the presence of tracking error induced signal fading assuming (1) binary on-off modulation (OOK) with both fixed and adaptive threshold receivers, and (2) binary polarization modulation (BPM). BPM is shown to maintain its inherent 2- to 3-dB advantage over OOK when adaptive thresholding is used, and to have a substantially greater advantage when the OOK system is restricted to a fixed decision threshold.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communications; COM-21; Sept
    Format: text
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  • 3
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    Theoretical and experimental comparison of an ultra-high-speed laser data transmission system (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The performance of a digital optical data transmission system is specified by the probability that the system erroneously decides a signal has or has not been transmitted. Two factors which induce signal fading and thereby decrease system performance are atmospheric scintillation and transmitter pointing inaccuracy. A channel simulator was developed that is capable of producing the effects of both atmospheric scintillation and the transmitter pointing problem for a neodymium-yag optical data transmission systems. Comparison of data taken from the modulated intensity of a beam having been transmitted through the channel simulator with experimental data from GEOS-B argon laser transmission through the atmosphere to a low earth-orbiting satellite indicates that the modulated signal intensity is log-normal to the degree of measured atmospheric scintillation.
    Keywords: MASERS
    Type: Significant Accomplishments in Technol., 1972; p 183-186
    Format: application/pdf
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  • 4
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    Experiment for determination of electroluminescent diode/diode mount thermal characteristics (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A practical laboratory technique is presented for evaluating the thermal characteristics of the diode/diode header combinations in terms of the diode spectrum and efficiency. Experimental data are presented verifying this technique for a GaALAs light emitting homojunction diode mounted on an oxygen-free high conductivity copper header.
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-TM-X-70440 , X-524-73-219
    Format: application/pdf
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  • 5
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    Channel simulation for direct-detection optical communication systems (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A technique is described for simulating the random modulation imposed by atmospheric scintillation and transmitter pointing jitter on a direct-detection optical communication system. The system is capable of providing signal fading statistics which obey log-normal, beta, Rayleigh, Ricean, or chi-square density functions. Experimental tests of the performance of the channel simulator are presented.
    Keywords: COMMUNICATIONS
    Type: NASA-TN-D-7641 , G-7439
    Format: application/pdf
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  • 6
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    Optical communication channel simulator system (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Optical transmission link is simulated by positioning linear optical modulator between optical carrier source and receiver for carrier. Optical modulator is driven by analog signal, derived from analog computer circuit, having random variations indicative of characteristics of transmission link.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: GSC-11877
    Format: application/pdf
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  • 7
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    Channel simulation for direct detection optical communication systems (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A technique is described for simulating the random modulation imposed by atmospheric scintillation and transmitter pointing jitter on a direct detection optical communication system. The system is capable of providing signal fading statistics which obey log normal, beta, Rayleigh, Ricean or chi-squared density functions. Experimental tests of the performance of the Channel Simulator are presented.
    Keywords: MASERS
    Type: NASA-TM-X-70562 , X-524-73-377
    Format: application/pdf
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