El-Diasty Fouad
Department of Physics, Faculty of Science, Ain Shams University, Abbasia, Cairo 11566 Egypt.
J Opt Soc Am A Opt Image Sci Vis. 2004 Aug;21(8):1496-502. doi: 10.1364/josaa.21.001496.
Fizeau micro-interferometry is applied to evaluate some parameters of a curved single-mode optical fiber. The field shift of the fundamental mode and the associated transition loss in a perturbed index-profile fiber due to bending are determined. The preceding fiber parameters are determined as a function of the shift of multiple-beam Fizeau fringes. For a curvature range between 0.13 and 0.053 mm(-1), a range of field shift between 0.44 and 0.21 microm is determined. A fraction of the transition loss ranging between 0.0056 and 0.028 is calculated within the same curvature range. Because our method has high index resolution and spatial resolution, it shows good agreement with theory. The results and the agreement with theory indicate that the use of multiple-beam Fizeau fringes is a promising technique that is capable of determining with high accuracy some guidance parameters of the optical fibers.
菲佐微干涉测量法被用于评估弯曲单模光纤的一些参数。确定了由于弯曲导致的微扰折射率分布光纤中基模的场移和相关的跃迁损耗。前面所述的光纤参数是根据多光束菲佐条纹的位移来确定的。对于曲率范围在0.13至0.053毫米⁻¹之间的情况，确定了场移范围在0.44至0.21微米之间。在相同曲率范围内计算出跃迁损耗的比例在0.0056至0.028之间。由于我们的方法具有高折射率分辨率和空间分辨率，它与理论显示出良好的一致性。结果以及与理论的一致性表明，使用多光束菲佐条纹是一种有前景的技术，能够高精度地确定光纤的一些导波参数。
