一种新型的再入式集成光学光纤陀螺研究

给出了一种改进型的再入式集成光学光纤陀螺方案，在保持再入式集成光学光纤陀螺低成本、高温度稳定性、小型化特点的条件下，通过偏振转换集成光学多功能器件(TMIOC)的使用，有望消除光纤环多次再入的本征损耗，减小总光损耗，提高信噪比，并可实现无光放大器(SOA)的高灵敏度光纤陀螺系统。TMIOC器件的位相调制器部分(PM)采用退火质子交换波导(APE)，实现天然的高偏振特性；PS是采用双模耦合方式实现的偏振模分离器。分离比达到20dB；PT是声光模转换器，实现TE和TM偏振模的相互转换，转换效率达到99％以上，声波功率小于20mW。目前的器件指标适合较长的光纤长度和较少的再入次数，满足高灵敏度光纤陀螺系统的要求；通过提高器件指标，如进一步提高响应速度，降低插入损耗，可实现较短的光纤长度和较多的再入次数的小型化、高灵敏度、低成本的第二代光纤陀螺系统的制作。

Research on a new type of re-entry IFOG

A new type of re-entry integrate fiber optics gyroscope(IFOG) which can remain the features of low-cost, high-temperature-stability and miniaturization is proposed. By use of the Transition-mode Multifunction Integrated-Optics Chip (TMIOC),it will eliminate the eigen loss caused by the multiple re-entry in fiber-ring. It will reduce the total loss of the light and raise the signal noise ratio. It can realize the high sensitivity FOG system without the semiconductor optical amplifier(SOA).The phase modulator (PM) of the TMIOC is made up of the anneal proton exchange waveguide (APE) which has natural high-polarization feature. The Polarization-mode Splitter (PS) of the TMIOC uses the method of dual-module couple and attains the separation of the two polarization modes. The separation ratio can reach 20 dB. The polarized-mode transition (PT) of the TMIOC makes the conversion of the polarization mode TE and TM with the acoustic-optics mode conversion. The efficiency of the conversion can reach over 99%, and the power of the acoustic is less than 20 mW. The items of the device are apt to the longer fiber and the less re-entry times at present. It can meet the demands of the high sensitivity FOG system. The improvement of the device, for example, improvement of the response speed and reduction of the couple loss, will make the device be used in the descendant-FOG with shorter fiber , more re-entry times, miniaturization, high sensitivity and low-cost.