Waveguide type polarization mode converter

Abstract

The invention discloses a waveguide type polarized mode converter, which is composed of a conventional dielectric waveguide which contains a substrate layer, a covering layer and a core layer; wherein, the core layer is formed by that the head and the tail of an L-shaped conversion waveguide are respectively connected with a rectangular input waveguide and a rectangular output waveguide which has a different dimension with the input waveguide, and also can be formed by that the head and the tail of the L-shaped conversion waveguide are respectively connected with a rectangular input waveguide and a rectangular output waveguide which has the same dimension as the input waveguide through a conical transition waveguide. The converter can realize the polarized mode conversion between the rectangular waveguides with different dimensions or same dimensions. The input waveguides which are processes by the polarized conversion have wide dimensional variation range, and the single mode conditions are easy to satisfy. The converter has simple structure, the required fabrication technology is mature, the dimension is compact, the polarized conversion efficiency is high, the frequency range is wide and is easy to be integrated, and the converter can be widely applied to the optical integrated circuits which are operated in the single polarized mode.

Description

technical field [0001] The present invention relates to a polarization mode converter, in particular to a waveguide type polarization mode converter. Background technique [0002] Because of the vectorial nature of light waves and the different boundary conditions of the electric and magnetic fields at the boundary, two different polarization modes widely exist in the waveguide. The two modes in the actual waveguide are often non-degenerate, have different propagation constants, and have different responses to external excitations, resulting in problems such as polarization mode dispersion, polarization loss dependence (correlation), and wavelength polarization dependence. Recently, for the polarization problem of waveguide, there are two different research approaches, one is to achieve polarization-independent characteristics by optimizing the device structure or compensation; the other is to make the device always work in a single polarization mode (such as H.Fukuda .et a...

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Problems solved by technology

The mentioned tapered transition waveguide also increases the design difficulty due to the introduction of the tapered structure

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