公开(公告)号：EP0222468A2

公开(公告)日：1987-05-20

申请号：EP86305855.8

申请日：1986-07-30

Applicant: NORTHERN TELECOM LIMITED

Inventor： Lowe, Richard Stephen ,  Saravanos, Constantine

IPC: G01M11/00

CPC classification number: G01M11/334 ,  G01J2001/068 ,  G01N21/59

Abstract: The fundamental-mode field radius 'w' is a key parameter in characterizing optical fibers. 'w' is a function of P, θ and A where P is the far-field power passing through a circular aperture subtending a solid angle of 2θ at the fiber end face and λ is the center wavelength of transmitted light. 'w' is derived by moving a fixed diameter aperture (20) along an axis extending between the test fiber end surface and a photodetector (24) so as effectively to vary θ. At each location the power P incident on the photodetector (24) and the corresponding acceptance angle θ are measured. A microprocessor (28) is programmed to compute from the range of measured values of θ and P, the value of mode field radius for a particular transmission wavelength λ.

Abstract translation: 基模场半径'w'是表征光纤的关键参数。 'w'是P，θ和λ的函数，其中P是通过在光纤端面处对角2θ的立体角的圆形孔的远场功率，λ是透射光的中心波长。 通过沿着在测试光纤端表面和光电检测器（24）之间延伸的轴线移动固定直径的孔（20）来实现'w'，以便有效地改变θ。 在每个位置处测量入射在光电检测器（24）上的功率P和对应的接受角度θ。 微处理器（28）被编程为从θ和P的测量值的范围计算特定透射波长λ的模场半径的值。

公开(公告)号：EP0222468B1

公开(公告)日：1989-11-29

申请号：EP86305855.8

申请日：1986-07-30

Applicant: NORTHERN TELECOM LIMITED

Inventor： Lowe, Richard Stephen ,  Saravanos, Constantine

IPC: G01M11/00

CPC classification number: G01M11/334 ,  G01J2001/068 ,  G01N21/59