Optical repeater
AssigneeNEC Corporation
InventorKenichi Yoneyama
Life of this patent
Estimating the term…
Abstract
From a terminal station, a monitoring information is transmitted superimposing on a primary signal. An optical repeater transmits a residual light of an excited light by exciting an erbium doped optical fiber by an exciting light source, in a direction opposite to said primary signal. Therefore, in the optical repeater, when a monitoring information is detected, a response signal to a terminal station is generated. The response signal is transmitted to upstream side by optical modulation of the exciting light source by the response signal.
Claims6
An optical repeater for amplifying and repeating an optical signal transmitted from an optical signal source via an optical fiber, said optical signal being superimposed with monitoring information including repeater identification data, said repeater comprising:
- an input terminal connected to said optical fiber and for inputting said optical signal transmitted from an upstream side of said optical repeater via said optical fiber;
- an optical fiber amplifier means for amplifying the inputted optical signal by optical excitation;
- an output terminal;
- a unidirectional element for completely transferring the output of said optical fiber amplifier means to said output terminal;
- and
- a monitoring processing circuit for processing the monitoring information having:
- extracting means for extracting said monitoring information superimposed on the optical signal being output by said unidirectional element,
- response signal generating means for generating a response signal when the repeater identification data in the extracted monitoring information matches with the repeater identification data of the optical repeater;
- response signal reproducing means for reproducing a response signal transmitted from an optical repeater located at downstream side via said optical fiber;
- and
- modulating means for modulating the exciting light of said optical fiber amplifier with said response signal;
- wherein a residual light of said exciting light is transmitted in a direction opposite to said optical signal from said input terminal connected to said optical fiber via said optical fiber amplifier means.
Dependencies are inferred from the claim text.