Based on original unwrapping-phase method, a new phase unwrapping algorithm is presented, which is by region and multi-point, and against noise effect.

针对噪声对相位展开的影响，在原有的相位展开算法基础上提出了基于多点的抗噪区域展开法。

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The interferometric phase of layover region is not accurate due to the superposition of multi-echo, it makes the discrimination difficult in phase unwrapping.

由于多点回波叠加，叠掩区域的相位并不准确，而且在相位解缠中影响判别，因此对叠掩区域进行识别具有重要意义。

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Then, super-local modes in multi-lobe stress region spun fibers can be obtained by using mode transform. Finally, the fiber birefringence is decided from the phase constants of super-local modes.

从而推得多叶应力区扭转光纤中的超本地模，由超本地模的相位常数来确定该光纤的双折射。

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