Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1984-11-09
1988-02-02
Orsino, Jr., Joseph A.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
375 48, 455611, 455615, 455617, H04B 900
Patent
active
047233109
ABSTRACT:
A digital data transmission system by modulating a coherent light wave is provided using modulation of the MSFK type with N frequencies for modulating the light wave. The transmitter comprises a coherent light source, a modulator, an output optical means and an MSFK modulation signal generator. The receiver comprises an input optical means, local light wave source and a heterodyne mixer for creating an electric signal of intermediate frequency. A demodulation and detection circuit comprises filtering means for separately selecting the N frequencies before detection. A processing cirucit puts the data back into its initial form. A circuit for compensating for the drift of the light sources is used for preserving lock on to the intermediate frequency.
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Faure et al-"Progress Towards Heterodyne"-IEEE Jour. of Quantum Electronics-vol. QE-17 No. 6, Jun. 1981, pp. 897-905.
Chadwick-"The Design of a Low Data Rate MSFK"-IEEE Trans. on Comm. Tech.-vol. Com.-18-No. 6, Dec. 190-pp. 740-750.
ICC '83 Conference Record of the IEEE International Conference on Communications, vol. 3, 19-22, Jun. 1983, IEEE, Boston (US). V.W.S. Chan et al, "Heterodyne Lasercom Systems using GaAs Lasers for ISL Applications", pp. El.5.7.
IEEE Transaction on Aerospace and Electronic Systems, vol. AES-8, No. 1, Ja. 1972, New York (US), G. A. McKay "Noncoherent Detection of Split-Phase FSK by Multiple Predection Filtering" pp. 51-63.
IEEE Transaction on Communication Technology, vol. COM-16, No. 5, Oct. 1968, New York (US), N. J. Ferguson: "Communication at Low Data Rates-Spectral Analysis Receivers" pp. 657-668.
de Corlieu Guy
Robin Leon
"Thomson-CSF"
Orsino Jr. Joseph A.
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