Open AccessImproved wavelength coded optical time domain reflectometry based on the optical switch
Author(s) -
Ning Zhu,
Youwan Tong,
Wei Chen,
Sunlong Wang,
Weimin Sun,
Jianguo Liu
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.015111
Subject(s) - optics , reflectometry , wavelength division multiplexing , time domain , beat (acoustics) , multiplexing , wavelength , optical time domain reflectometer , signal (programming language) , optical fiber , materials science , physics , fiber optic sensor , fiber optic splitter , telecommunications , computer science , computer vision , programming language
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.