The impact of residual coherent phase error in a dual-polarization interferometric fiber optic gyroscope (IFOG) is investigated. Although it has been intuitively assumed that the coherence of a light source can be eliminated by a sufficient long fiber delay, the experiment and theory indicate that it still contributes a remarkable portion to long-term instability. After the residual coherent phase error is well handled, we demonstrate a dual-polarization IFOG with bias instability of $3.56\times {10}^{-4}°/\mathrm{h}$. Comparisons show that such performance is even better than the conventional “minimal scheme” that operates on one polarization.

中文翻译：

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有效抑制双偏振光纤陀螺仪中的残余相干相位误差

研究了双偏振干涉式光纤陀螺仪（IFOG）中残余相干相位误差的影响。尽管已经直观地假定可以通过足够长的光纤延迟来消除光源的相干性，但是实验和理论表明，光源的相干性仍然对长期的不稳定性起了很大的作用。处理完残余相干相位误差后，我们证明了偏置不稳定性为的双极化IFOG。$3.56\times {10}^{-4}°/\mathrm{H}$。比较表明，这种性能甚至比在一个极化上运行的常规“最小方案”更好。