Effect of radiation-induced mean wavelength shift in optical fibers on the scale factor of an interferometric fiber optic gyroscope at a wavelength of 1300 nm

Abstract

In order to analyze the effect of wavelength-dependent radiation-induced attenuation (RIA) on the mean transmission wavelength in optical fiber and the scale factor of interferometric fiber optic gyroscopes (IFOGs), three types of polarization-maintaining (PM) fibers are tested by using a 60Co γ-radiation source. The observed different mean wavelength shift (MWS) behaviors for different fibers are interpreted by color-center theory involving dose rate-dependent absorption bands in ultraviolet and visible ranges and total dose-dependent near-infrared absorption bands. To evaluate the mean wavelength variation in a fiber coil and the induced scale factor change for space-borne IFOGs under low radiation doses in a space environment, the influence of dose rate on the mean wavelength is investigated by testing four germanium (Ge) doped fibers and two germanium—phosphorus (Ge—P) codoped fibers irradiated at different dose rates. Experimental results indicate that the Ge-doped fibers show the least mean wavelength shift during irradiation and their mean wavelength of optical signal transmission in fibers will shift to a shorter wavelength in a low-dose-rate radiation environment. Finally, the change in the scale factor of IFOG resulting from the mean wavelength shift is estimated and tested, and it is found that the significant radiation-induced scale factor variation must be considered during the design of space-borne IFOGs.

Loss prediction of three-level amplified spontaneous emission sources in radiation environment

“…[5,6] Generally, it is believed that the degradation mainly caused by the creation of color centers (CCs) that are responsible for a socalled radiation-induced attenuation (RIA). [7,8] And there coexist two combined effects: a) pump absorption by CCs which indirectly causes reduction of gain, and b) gain absorption by CCs. Besides, pump-induced bleaching in EDFs should also be in consideration.…”

All-fiber modal interferometer based on an up-taper-core-offset structure for curvature sensing

“…Allfiber sensors have aroused tremendous research interest because of their high sensitivity, easy fabrication, low cost, immunity to electromagnetism, and capability to measure various parameters. [1][2][3][4][5][6][7][8][9][10][11] There have been many fiber curvature sensors reported in recent years. Gong et al fabricated an allfiber curvature sensor based on multimode interference.…”

Radiation-induced attenuation self-compensating effect in super-fluorescent fiber source

“…[12,13] Modeling and experimental studies showed that RIA depends not only on the total radiation dose, but also on the dose rate, operating optical wavelength, and so on. [14][15][16][17] The RIA spectrum may be regarded as the result from the combined contributions of radiation-induced background attenuation (RIBA) and radiation-induced active band attenuation (RIABA). RIBA is due to the generation of a color center with absorption peak generally lying in the ultraviolet region; it can be described with a Lorentzian tail in which the absorption decreases with wavelength increasing.…”