Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.
Opt Lett. 2010 Jan 15;35(2):121-3. doi: 10.1364/OL.35.000121.
We report what we believe to be the first demonstration of a laser-driven fiber optic gyroscope (FOG) built with an air-core fiber. Its phase noise is measured to be 130 murad/ radicalHz. When the sensing fiber is replaced with a conventional fiber, this figure drops to 12 murad/ radicalHz. Comparison between these values suggests that the air-core fiber gyro is most likely not limited solely by backscattering noise but by reflections at the solid-core/air-core interface. By minimizing additional noise sources and reducing the air-core fiber loss to its theoretical limit (approximately 0.1 dB/km), we predict that the backscattering noise of the laser-driven air-core FOG will drop below the level of current FOGs. Compared with commercial FOGs, this FOG will exhibit a lower noise, improved thermal and mean-wavelength stability, and reduced magnetic-field sensitivity.
我们报告了首例使用空心光纤制造的激光驱动光纤陀螺仪（FOG）的演示。其相位噪声测量值为 130 毫拉德/根号赫兹。当将传感光纤替换为常规光纤时，该数字降至 12 毫拉德/根号赫兹。这些数值的比较表明，空心光纤陀螺仪很可能不仅受到背向散射噪声的限制，还受到固芯/空心界面反射的限制。通过最小化其他噪声源并将空心光纤损耗降低到理论极限（约 0.1dB/km），我们预测激光驱动空心光纤 FOG 的背向散射噪声将低于当前 FOG 的水平。与商业 FOG 相比，这种 FOG 将具有更低的噪声、改善的热和平均波长稳定性以及降低的磁场灵敏度。
