Passive Resonator Fiber Optic Gyro Composed of Waveguide/Fiber-optic Devices with Schemes to Reduce Noises

本研究的目的是研制一种采用波导型或光纤型器件的无源谐振式光纤陀螺，并研究如何在系统中加入对几种噪声因素的抑制措施。为了实现陀螺的稳定工作，需要在整个系统中加入导波器件。取得了以下研究成果。[1]本研究提出了一种新的系统结构-数字式锯齿波谐振腔光纤陀螺，其输入光频率由波导型光相位调制器控制，驱动波形为锯齿形，具有数字阶梯斜率。该波形通过使用A/D转换器容易地产生。利用专门为干涉式光纤陀螺设计的铌酸锂基片集成光波导器件陀螺芯片，搭建了实验装置。旋转检测已成功演示 ...更多信息 D这个设置。[2]驱动波形已被证明是由数字逻辑产生的。大约12位的A/D和D/A转换器足以实现飞机导航所需的7位动态范围。通过改变相位调制器的驱动波形，可以减小后向散射引起的噪声和光克尔效应引起的漂移。在系统中已经实现了减小由于极化波动和通过地磁的法拉第效应引起的漂移的方法。[3]制作了由扭转单模光纤构成的谐振腔，从偏振度涨落的观点看，这种谐振腔是稳定的。实验证明了该方法的稳定性。[4]还研究了利用光纤环形腔中的激光振荡的有源谐振腔光纤陀螺。搭建了布里渊光纤陀螺的实验装置，成功地实现了布里渊光纤陀螺的旋转检测。少

The purpose of this research is to develop a pasive resonator fiber optic gyro using waveguide-type or fiber-optic-type devices, and study the ways to include the countermeasures against several noise factors in the system. It is desirable to compose all the system with guided-wave devices for achieving stable operation of the gyro. The following research results have been obtained.[1] We have invented the new system configuration named "Digital serrodyne resonator fiber optic gyro, " in this study, in which the input optical frequency into the resonator is controlled by waveguide-type optical phase modulators with the driving waveform of sawtooth-shape having digital staircase slope. This waveform is easily generated by using an A/D converter. Using the gyro chip, which is an integrated optical waveguide devices on LiNbO3 substrate especially designed for interferometer fiber optic gyros, the experimental setup has been constructed. Rotation detection has been successfully demonstrate … More d by this setup.[2] The driving waveform has been shown to be generated by the digital logic. A/D and D/A converters with about 12 bits is enough for achieving 7 digits of the dynamic range, which is required for aircraft navigation. Is has also been shown that the backscattering induced noise and the optical Kerr effect induced drift can be reduced only by modifying the driving waveform for the phase modulators. The ways to reduce the drirt due to the poralization fluctuation and the Faraday effect through the earth magnetism have already been implemented into the system.[3] The resonators composed of twisted ordinaly single mode fiber have been made, which are stable from the view point of the poralization fluctuation. Experiments have confermed the stability.[4] Active resonator fiber optic gyros, utilizing the laser oscillation in the fiber ring resonator, have also been studied. Experimental setup of the Brillouin fiber optic gyro has been constructed, by which the rotation detection has been carried out successfully. Less