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Polarizing beam splitter integrated onto an optical fiber facet

Polarizing beam splitter integrated onto an optical fiber facet

V. Hahn, S. Kalt, G.M. Sridharan, M. Wegener, and S. Bhattacharya


Opt. Express 26, 33148-33157 (2018)

Datum: 4.12.2018


When light either leaves or enters an optical fiber, one often needs free-space optical components to manipulate the state of polarization or the light’s phase profile. It is therefore desirable to integrate such components onto a fiber end facet. In this paper, we realize, for the first time, a polarizing beam splitter fabricated directly onto the end facet of a single-mode optical fiber. The element is composed of a refractive prism, intentionally slightly displaced from the core of the fiber, and an elevated and suspended sub-wavelength diffraction grating, the lamellae of which have an aspect ratio of about 5. This integrated micro-optical component is characterized experimentally at 1550 nm wavelength. We find that the two emerging output beams exhibit a degree of polarization of 81 percent and 82 percent for Transverse Magnetic (TM) and Transverse Electric (TE) polarization, respectively.