Optical repeater haivng means for preventing malfunction due to

Details Optical repeater haivng means for preventing malfunction due to Optical repeater haivng means for preventing malfunction due to

1990-07-27

1992-07-14

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359177, H04B 1002

Patent

active

051308371

ABSTRACT:
An optical repeater provided in an up line and a down line, the optical repeater includes a first circuit related to the up line, and a second circuit related to the down line. Each circuit includes an optical receive/decision circuit, a command extraction circuit, a command detection circuit, a command switch and a supervisory circuit. Each circuit also includes a noise component processing circuit which extracts, from the electrical signal, a noise component within a predetermined frequency range excluding a frequency of the command signal and determines whether or not the optical signal is input to the optical receive/decision circuit on the basis of the noise component and which prevents the noise component passing through the command extracting circuit from being directly applied to the command detecting circuit when it is determined that no the optical input is input to the optical receive/decision circuit. Each circuit further includes an output circuit which converts the data signal and a supervisory signal into an optical output which is transferred to a corresponding one of the up line and the down line.

REFERENCES:
patent: 4278850 (1981-07-01), Sato et al.
patent: 4295225 (1981-10-01), Pan
patent: 4449247 (1984-05-01), Waschka, Jr.
patent: 4710976 (1987-12-01), Wakabayashi et al.

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