Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 18, Pages 5744-5752Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3094247
Keywords
Correlation; Optical fiber amplifiers; Reflection; Optical variables measurement; Optical fiber dispersion; Delays; Signal to noise ratio; Fiber characterization; group delay; latency; optical performance monitoring; optical time domain reflectometry (OTDR); signal processing; temperature
Funding
- European Union's Horizon 2020 Research and Innovation Programme through BlueSpace Project [762055]
- German Ministry for Education and Research (BMBF) through OptiCON Project [16KIS0989K]
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The C-OTDR method presented in this paper achieves high accuracy in measuring propagation delay through the use of a high data rate and specific techniques. It can be applied for monitoring link delay and chromatic dispersion of long fiber spans, as well as temperature sensing applications.
A correlation optical time-domain reflectometry (C-OTDR) method is presented, which measures the propagation delay with an accuracy of a few picoseconds. This accuracy is achieved using a test signal data rate of 10 Gbit/s and employing cross-correlation and pulse fitting techniques. In this paper we introduce and evaluate the basic signal processing steps, investigate the measurement accuracy, and discuss applications for monitoring link delay and chromatic dispersion of long fiber spans as well as temperature sensing applications.
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