ABSTRACT
The optical coupling efficiency of laser-to-fiber is defined by the overlap integral of the optical field at the facet of optical fiber and the focused light from laser. In general, the coupling efficiency of input optical field E 1(x, y) to guided mode E 2(x, y) is express by () η = | ∫ ∫ E 1 ( x , y ) ⋅ E 2 * ( x , y ) d x d y | 2 [ ∫ ∫ | E 1 ( x , y ) | 2 d x d y ] ⋅ [ ∫ ∫ | E 2 ( x , y ) | 2 d x d y ] https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315220949/77cbcab8-b2d5-485c-b5ba-5378c11678dd/content/eq276.tif"/>
