SYSTEM FOR DETECTING BROKEN OPTICAL FIBER

PURPOSE:To detect a broken optical fiber even when an optical coding circuit is faulty by moving an operating point of a logical value minimizing the luminous quantity of a light emission circuit to another operating point having a large luminous quantity. CONSTITUTION:A signal level appearing acros...

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Bibliographic Details
Main Authors SHIMADA MASAHARU, SASAKI ATSUSHI, TAKEMOTO KENJI
Format Patent
LanguageEnglish
Published 28.01.1991
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MEASURING
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
TRANSMISSION
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Summary:PURPOSE:To detect a broken optical fiber even when an optical coding circuit is faulty by moving an operating point of a logical value minimizing the luminous quantity of a light emission circuit to another operating point having a large luminous quantity. CONSTITUTION:A signal level appearing across a resistor 13 is amplified by an amplifier circuit 14 and the amplified signal is extracted through a capacitor 15 bypassing only logic signal and a resistor 16 and the received logic signal is extracted by an amplifier circuit 17. On the other hand, an output of the amplifier circuit 14 is rectified by a diode 20 via a buffer circuit 19 and the pulsating component of the logic signal is eliminated by a parallel circuit comprising a resistor 21 and a capacitor 22. The output signal is a DC signal and the level is a sum of the average power level of the logic signal and the DC level at a reference operating point A'. Thus, if an optional fiber is broken, both the output of the logic signal and the level detection output cannot be received. Thus, a broken optical fiber is detected.
Bibliography:Application Number: JP19890152127