Polarization-maintaining fiber for fiber-optic gyroscope;

Coupling model of fused polarization-maintaining fiber couplers is built on the basis of coupling mode theory of optical waveguide.

The polarization-maintaining fiber coil in a fiber optic gyro(FOG) is a sensitive element,its loss will increase when it works in radiation environment such as the spatial,and the performance of FOG also degracles.

Application and maintenance about optical fiber protection;

By the basic mode and characteristic of the optical fiber protection, the adopting mode, which transmits relay protection signal through the optical fiber communication network in some 220 kV power line of Sanming, is expatiated.

The composition of the optical fiber channels of optical fiber protection in high voltage transmission line is introduced,the test methods for the appropriative or multiplexed optical fiber channels and some items that should be noticed when test is being done are presented.

Beat length measurement of polarization maintaining fiber;

Optical fiber magnetic field sensor is obtained by coating the TbDyFe film around the naked polarization maintaining fiber by mean of DC magneton sputter technology.

From the point of view of optic system limitation of fiber optic gyro,the phenomena of polarization interference which suffered from the fusion error of polarization maintaining fiber and unperfect optical element is studied.