Improved wavelength coded optical time domain reflectometry based on the optical switch

This paper presents an improved wavelength coded time-domain reflectometry based on the 2 × 1 optical switch. In this scheme, in order to improve the signal-noise-ratio (SNR) of the beat signal, the improved system used an optical switch to obtain wavelength-stable, low-noise and narrow optical puls...

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Bibliographic Details
Published in:Optics express 2014-06, Vol.22 (12), p.15111-15117
Main Authors: Zhu, Ninghua, Tong, Youwan, Chen, Wei, Wang, Sunlong, Sun, Wenhui, Liu, Jianguo
Format: Article
Language:English
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Summary:This paper presents an improved wavelength coded time-domain reflectometry based on the 2 × 1 optical switch. In this scheme, in order to improve the signal-noise-ratio (SNR) of the beat signal, the improved system used an optical switch to obtain wavelength-stable, low-noise and narrow optical pulses for probe and reference. Experiments were set up to demonstrate a spatial resolution of 2.5m within a range of 70km and obtain the beat signal with line width narrower than 15 MHz within a range of 50 km in fiber break detection. A system for wavelength-division-multiplexing passive optical network (WDM-PON) monitoring was also constructed to detect the fiber break of different channels by tuning the current applied on the gating section of the distributed Bragg reflector (DBR) laser.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.22.015111