APPARATUS FOR CHECKING FREQUENCY USING OPTICAL FILTERS HAVING DIFFERENT TRANSMISSION CHARACTERISTICS

PURPOSE: An apparatus for checking a frequency using optical filters having different transmission characteristics is provided to use an optical fiber and a pilot tone which is used for checking the existence and the size of an optical signal in an optical transmission system based upon multi wave d...

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Bibliographic Details
Main Authors JUNG, YUN CHEOL, PARK, GEUN JU, SHIN, SEUNG GYUN
Format Patent
LanguageEnglish
Published 16.10.2000
Edition7
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MULTIPLEX COMMUNICATION
TRANSMISSION
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Summary:PURPOSE: An apparatus for checking a frequency using optical filters having different transmission characteristics is provided to use an optical fiber and a pilot tone which is used for checking the existence and the size of an optical signal in an optical transmission system based upon multi wave division method in order to manage and maintain the system efficiently. CONSTITUTION: A first shaping coupler(111) extracts an optical signal from an externally inputted optical signal. A second shaping coupler(112) equally divides the signal inputted from the first shaping coupler(111). A first and a second optical filters(113,114) filter different bandwidth transmission filtering with respect to a signal inputted from the second shaping coupler(112). A first and a second optical detectors(115,116) measure the intensity of the optical signal from an analog signal transmitted through the first and the second optical filters(113,114). An analog/digital converter(117) converts the analog signals outputted from the first and the second optical detectors(115,116) into digital signals.
Bibliography:Application Number: KR19990008384