Optical transmission line system

Details Optical transmission line system Optical transmission line system

1990-02-09

1992-03-24

Kuntz, Curtis

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04B 1024

Patent

active

050993496

ABSTRACT:
An optical transmission line system includes a first optical transmission line equipment having a pair of a first optical signal transmission unit and a first optical signal reception unit, and a second optical transmission line equipment having second optical signal transmission and reception units which are connected to the first optical signal transmission and reception units through downstream and upstream optical transmission lines. When light stoppage is detected by the optical signal reception unit due to the occurrence of a disconnection or other breakage in the optical transmission lines, a corresponding optical signal transmission unit reduces the transmission level of the light transmission signal to a level harmless to the human eye. In order to reduce the level of transmission, the optical signal transmission unit converts all the main signal data bits to "0" and sends only the small number of supervisory information bits to the optical signal reception unit of the other side. The optical signal reception unit operates so as to reduce the level of transmission of the optical signal transmission unit forming a pair with that unit.

REFERENCES:
patent: 4994675 (1991-02-01), Levin et al.

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