High performance single mode OTDR using coherent detection and fibre amplifiers

26 April 1990

journal article
Published by Institution of Engineering and Technology (IET) in Electronics Letters

Vol. 26 (9) , 573-575
https://doi.org/10.1049/el:19900375

Abstract

A high performance single mode OTDR has been constructed at 1.55 μm using a DFB laser diode, laser diode pumped fibre amplifiers and a coherent detector, all suited to integration into a robust and portable instrument. A dynamic range of 33 dB has been attained with 1 μs launch pulses, 1 MHz receiver bandwidth and 10⁴ integrations. This result represents an increase of about 13 dB in performance over the standard version of the OTDR using a laser diode as a light source. It is comparable to the best previously reported value attained using a high power glass laser and a cooled detector.

Keywords

1 MHZ
LIGHT SOURCE
OPTICAL TIME DOMAIN REFLECTOMETER
LASER DIODE PUMPED AMPLIFIER
RECEIVER BANDWIDTH
1.55 MICRON
FIBRE AMPLIFIERS
DFB LASER DIODE
OPTICAL FIBRE FAULT LOCATION
COHERENT DETECTION
SINGLE MODE OTDR

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