title: Improved wavelength coded optical time domain reflectometry based on the optical switch.
abstract: 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.
authors: Ninghua
authors: N
authors: Zhu
authors: Youwan
authors: Y
authors: Tong
authors: Wei
authors: W
authors: Chen
authors: Sunlong
authors: S
authors: Wang
authors: Wenhui
authors: W
authors: Sun
authors: Jianguo
authors: J
authors: Liu