System for transmitting digital signals over an optical fiber

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency

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328117, 375 36, 455619, H04B 900

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active

045049750

ABSTRACT:
The receiver of an optical-fiber transmission system comprises a device for restoring each digital signal comprising a first comparator comparing the level of the electric signal with a first reference level and generating a signal when the level of the electric signal is less than the reference level, a second comparator comparing the level of the electric signal with a second reference level and generating a signal when the level of the electric signal is greater than the reference level, and a summator summing the signals generated by the two comparators.

REFERENCES:
patent: 3991379 (1976-11-01), Chadwick
patent: 4017747 (1977-04-01), Sheng
patent: 4229831 (1978-12-01), Lacher
patent: 4241455 (1980-12-01), Eibner
patent: 4397042 (1983-08-01), Tsujii et al.
Mahony-"Duobinary Transmission"-Electronics Letters-Sep. 1980, vol. 16, No. 9, pp. 752-753.
Patent Abstracts of Japan, vol. 6, No. 37, Mar. 6, 1982, pp. E97-915, & JP-A-56 154 858 (TEAC).
Nasa Tech. Brief, No. NTN-77/0768, 1976, Houston, Texas (US), "Capacitively-coupled Data Receiver Clipper Stage".

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