Tsubokawa M, Higashi T, Negishi Y
Appl Opt. 1988 Jan 1;27(1):166-73. doi: 10.1364/AO.27.000166.
A new interferometric scheme for measuring mode conversion distributed locally along a polarizationmaintaining fiber is presented. Using this technique the power coupling coefficient, varying with magnitude and angle of external pressure transversely applied to a fiber, was evaluated both theoretically and experimentally. The coupling point location is determined with +/- 1.5-cm accuracy and resolution of better than 10 cm for a 220-m long fiber having modal birefringence of 4.4 x 10 (- 4). The coupling coefficient was proportional to the external force in the range from 5 x 10 (- 3) to 0.1 kg/mm. The relationships determined experimentally reflected those predicted by theory.
提出了一种用于测量沿保偏光纤局部分布的模式转换的新型干涉测量方案。利用该技术，从理论和实验两方面评估了随横向施加于光纤的外部压力的大小和角度而变化的功率耦合系数。对于长度为220 m、模式双折射为4.4×10(-4)的光纤，耦合点位置的确定精度为±1.5 cm，分辨率优于10 cm。耦合系数在5×10(-3)至0.1 kg/mm的范围内与外力成正比。实验确定的关系反映了理论预测的关系。
