Estimation of coupling efficiency of optical fiber by far-field method |
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Authors: | Keiji Kataoka |
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Institution: | 1. 3381-31 Higashi-ishikawa, Hitachinaka, Ibaraki, 312-0052, Japan
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Abstract: | Coupling efficiency to a single-mode optical fiber can be estimated with the field amplitudes at far-field of an incident
beam and optical fiber mode. We call it the calculation by far-field method (FFM) in this paper. The coupling efficiency by
FFM is formulated including effects of optical aberrations, vignetting of the incident beam, and misalignments of the optical
fiber such as defocus, lateral displacements, and angle deviation in arrangement of the fiber. As the results, it is shown
the coupling efficiency is proportional to the central intensity of the focused spot, i.e., Strehl intensity of a virtual
beam determined by the incident beam and mode of the optical fiber. Using the FFM, a typical optics in which a laser beam
is coupled to an optical fiber with a lens of finite numerical aperture (NA) is analyzed for several cases of amplitude distributions
of the incident light. |
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