Optical Time Domain Reflectometry Using the Heterodyne Principle
Optical time domain reflectometry (OTDR) is well established to measure the transmission characteristics (attenuation, splice loss, fault location) of optical-fibre communication channels. A short light-pulse (typical duration 1 µs) is launched into one end of the fibre and the resulting backscatter response is evaluated. Present OTDR-systems are mostly using direct-detection receivers.
KeywordsDirect Detection Insertion Loss Intermediate Frequency Local Oscillator Noise Equivalent Power
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