Supervisor's Foreword; Abstract; Parts of this thesis have been published in the following journal articles:; Acknowledgements; Contents; Acronyms; 1 Introduction; 1.1 Research Background of the Dual-Polarization Two-Port IFOG; 1.2 Related Researches; 1.3 Dissertation Contribution; References; 2 Polarization Error Compensation in Dual-Polarization IFOGs; 2.1 First Observation of Polarization Error Compensation in an IFOG; 2.2 Polarization Error Compensation in an Depolarized IFOG; 2.3 Theoretical Analysis of Polarization Error Compensation; 2.4 Summary; References

3 Theory Study of Optically Compensated Dual-Polarization IFOGs3.1 Dual-Polarization IFOG Based on Lyot Depolarizers; 3.2 Theoretical Verification of Polarization Error Compensation in Optical Domain; 3.3 Experimental Verification of Optically Compensated Dual-Polarization IFOGs; 3.4 Further Discussions; 3.5 Summary; References; 4 Output Properties of Dual-Polarization IFOGs; 4.1 Theoretical Comparison About Two-Port Detection Feasibility Between Two Categories of IFOGs; 4.1.1 Polarization Error Analysis of an Conventional Reciprocal IFOG

4.1.2 Polarization Error Analysis of an Dual-Polarization IFOG4.1.3 Simulation Comparison Between Two Categories of IFOGs; 4.2 Two-Port Detection Within Dual-Polarization IFOGs; 4.3 Synchronous Subtraction for Noise Reduction in an Dual-Polarization Two-Port IFOG; 4.4 An Ultra-Simple Configuration of the Dual-Polarization IFOG; 4.5 Summary; References; 5 Multichannel Signal Processing Methods for IFOGs; 5.1 Sinusoidal Phase Modulation for Open-Loop IFOGs; 5.2 Quadrature Demodulation with Synchronous Difference for IFOGs; 5.3 Multidimensional Gray-Wavelet Processing in IFOGs

5.4 Quadrature Demodulation for IFOGs with Square Wave Modulation5.5 Unbiased Measurement Based on Two IFOG Channels; 5.6 Summary; References; 6 Preliminary Test on an Engineering Prototype of the Dual-Polarization IFOG; 6.1 Preliminary Build and Test Environment; 6.2 Brief Test Results; 6.3 Summary; References; 7 Conclusions and Outlook