Jin Shangzhong

Highly Sensitive Refractive Index Sensor Based on a Cladding-Etched Thin-Core Fiber Sandwiched between Two Single-Mode Fibers

A refractive index (RI) sensor based on a cladding-etched thin-core single-mode fiber (TCSMF) sandwiched between two single-mode fibers is demonstrated. The experimental results show that the sensitivity, within the RI range of 1.333–1.340, is enhanced at least 6 times by etching. It increases with the surrounding RI and reaches 857.5 nm/RIU at RI of 1.3684, and it can be expected to be higher with the decrease of the cladding diameter of the TCSMF.

High Speed Free Space Optical Communication System for 1km communication

The operating principle and structure of free space optical communication system are introduced. The systems duplex communication tests showed the data transmission speed rate can reach 2Gbps, error rate less than 10E-10, signal-to-noise ratio greater than 9 with the attenuation coefficient of -15dB/km and the transmission length of 1200 m.