Internal focus coupling efficiency for optical signal acquisition by using specialty optical taper.

A specialty optical taper is proposed for optical signal acquisition in fiber sensors, optical communication and laser radar etc. Based on the profile curve equation of specialty optical taper, the internal focus coupling efficiency has been analyzed by using the ray-tracing method. Considering the Fresnel reflection loss, the relationships among the internal focus depth, taper length, shape factor, large-end radius, small-end radius, radial displacement, and coupling efficiency are analyzed, respectively. The results show that the internal focus coupling efficiency can be close to 100% as a certain range of incidence angle varies in radial directions. Finally, the influencing factors of analysis conclusion are also given. [ABSTRACT FROM AUTHOR]