Characteristics of coupling degradation tolerances for single-mode optical fiber

Abstract EN

The coupling tolerances is considered as an important parameters for the optical designer and it can not be ignored.

Since the coupling efficiency is affected by the displacement of the optical components during the thermal expansion and the assembling processes, so, the coupling tolerances are just as important as coupling efficiency in the assessment of the optical coupling system.

In this research the coupling tolerances for laser source to single mode optical fiber have been analyzed, these tolerances include : lateral offset, angular misalignment (tilt) and longitudinal offset for the optical fiber, also the tolerances values have been limited, our criteria is (- 4dB) as coupling loss to point the tolerance of the coupling efficiency versus the misalignment in the optical coupling system.