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A Mach-Zehnder and Michelson Hybrid (M2) interferometer is promoted to measure backreflection of modes at the hollow-core photonic bandgap fiber (HC-PBF) terminations. The results show that compared to the incident light intensity into the HC-PBF, the modes reflectivity is less than −80 dB at the flat termination, and it is about −90 dB for the fundamental modes.
Fiber optical gyroscope (FOG) is a kind of angle velocity sensor developed in recent 30 years, with characteristics of small volume, solid structure, fast startup and so on. FOG is an important component for high-precision navigation and control of autonomous robots. Shupe error, a kind of bias error in FOG over temperature varying environments, still exists even with strict quadrupolar winding pattern,...
In order to restrain the velocity error and improve the navigation precision of dual-axis rotation-modulating INS, the effect of calibration error during one modulated period is analyzed and the ‘observable’ of the calibration error by the sawtooth type velocity are pointed out. A self-calibration method for dual-axis rotation-modulating INS is brought out, and a calibration rotation sequences is...
Dense wavelength division multiplexing (DWDM) technology is a promising way for high transmission-rate demand in the ever complex Earth Observation satellites and space station. However, fiber Bragg grating (FBG) filters used in DWDM systems may fail to check out the correct wavelength affected by cosmic rays. In order to analyze the spectra characteristics of FBGs in gamma radiation environment,...
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