Showing papers by "Yohei Sakamaki published in 2017"
TL;DR: The experimental results show that the fabricated waveguide frontend provides a polarization diversity function without any degradation in optical performance.
Abstract: We propose a waveguide frontend with integrated polarization diversity optics for a wavelength selective switch (WSS) array with a liquid crystal on silicon switching engine to simplify the free space optics configuration and the alignment process in optical modules. The polarization diversity function is realized by the integration of a waveguide-type polarization beam splitter and a polarization rotating half-wave plate in a beam launcher using silica-based planar lightwave circuit technology. We confirmed experimentally the feasibility of using our proposed waveguide frontend in a two-in-one 1 × 20 WSS. The experimental results show that the fabricated waveguide frontend provides a polarization diversity function without any degradation in optical performance.
7 citations
Patent•
19 Jan 2017
TL;DR: In this paper, a filling material is applied to an end surface of a flat optical circuit with a plurality of optical waveguides formed therein, and a wavelength plate 104 and a glass plate 300 are arranged.
Abstract: PROBLEM TO BE SOLVED: To provide a polarization control device that can uniform the thickness of an adhesion layer when making a wave plate adhere thereto and can precisely control polarization and beam quality.SOLUTION: A filling material 200 is applied to an end surface of a flat optical circuit 100 with a plurality of optical waveguides 102 formed therein, and a wavelength plate 104 and a glass plate 300 are arranged. The wavelength plate has a phase imparting part for imparting a desired phase difference to desired waveguides among the plurality of optical waveguides, and a non-phase imparting part (air part) with an open end in a cross section shape perpendicular to a travelling direction of lights. The phase imparting part and the non-phase imparting part are communicated with each other through the open end. Pressing from a surface of the glass plate toward the end surface can also fill the filling material uniformly into the non-phase imparting part between the end surface of the flat optical circuit and the glass plate.SELECTED DRAWING: Figure 5