双折射单模光纤的保圆耦合

Circular Polarization Maintaining Coupling between Birefringence Single-mode Optical Fibers

提出了一种利用双折射单模光纤扭转时产生的圆双折射性获得保圆偏振的新方法，该法应用于光纤耦合器的基本思想是通过有效地改变扭转光纤在耦合区域的单位扭转度，从而达到光纤之间实现保圆耦合的目的。同时，用耦合模方程分析了利用该法构成的２×２单模光纤耦合器的耦合行为，结果表明光纤耦合器达到了较好的保圆耦合。

A novel method for maintaining circular polarization propagation in twistedbirefringence single-mode optical fibre by using altering the twisting unit of fibre ispresented. The results of investigating for a 2 X 2 twisted birefringence single￣mode opticalfibre coupler desinged by this method shows that there is satisfactory circular polarizationmaintaining coupling between the two fibres.