Liang Chen

TL;DR: An up to 1100°C and 1200°C high-temperature distributed Brillouin sensing based on a GeO2-doped single mode fiber and a pure-silica photonics crystal fiber are demonstrated and it is found that the BFS dependence on temperature of SMF and PCF agrees well with an exponential function instead of a linear function.

TL;DR: In this article, a Brillouin fiber laser with ultranarrow linewidth of 30 Hz was demonstrated for the first time without phase locking loop, the laser operates single longitudinal mode, while mode selection is achieved by a Fabry-Perot interferometer and a section of coreless fiber with Farday rotation mirror through optical phase conjugation.

TL;DR: It is demonstrated that the higher-order modes excited in GI-MMF can be easily influenced by bending, so that exciting the fundamental mode is essential for bend-insensitive distributed sensing.

TL;DR: A novel approach for the generation of high extinction-ratio square pulses based on self-phase modulation of sinusoidally modulated optical signals (SMOS) and a reduced background noise level in the Rayleigh backscattering traces of a phase-OTDR vibration measurement system is demonstrated.

TL;DR: In this article, a generalized Poincare/spl acute/sphere method is proposed to measure the complex principal states of polarization vector for a system with polarization-dependent loss or gain.