Repeater using optical cables for radio paging system

Details Repeater using optical cables for radio paging system Repeater using optical cables for radio paging system

1996-07-01

1997-11-18

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359145, 359152, 359167, H04B 1016, H04B 1000

Patent

active

056893558

ABSTRACT:
A repeater which is installed as measures for silent zones, which automatically compensates for a variation in a light loss caused by a difference in length among optical cables interconnecting a master device and a plurality of slave devices which are allocated and installed in an underground shopping center or the like. The master device and the slaves devices both have current detectors for detecting current values of O/E transducers which transduce received lights to electric signals. Based on the detected current values, gain control signals are applied to variable gain amplifiers to change their amplification factors so that the levels of output RF signals for transmission to a radio base station and a portable station have a prescribed value, thereby compensating for the variation in the light loss of the optical cables. The present invention greatly facilitates the installation of the repeater and additional installation of slave devices.

REFERENCES:
patent: 5159479 (1992-10-01), Takagi
patent: 5400391 (1995-03-01), Emura et al.

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