Polarization converter based on trapezoidal waveguide structure

Abstract

The invention discloses a polarization converter based on a trapezoidal waveguide structure. The polarization converter includes ridge waveguides which are in double-layer trapezoid arrangement, slab waveguides and strip waveguides in asymmetrical trapezoid arrangement, the ridge waveguides are arranged on upper end faces of the slab waveguides and are aligned with two ends of the slab waveguides, the ridge waveguides and the right ends of the slab waveguides are connected with the strip waveguides, a TM0 mode is incident from the ridge waveguides and the left ends of the slab waveguides and is converted into a TE1 mode through the ridge waveguides and the slab waveguides, and the TE1 mode is input to the strip waveguides, and is converted into the TE0 mode to be output after passing through the strip waveguides; and conversely, the TE0 mode is incident from the right ends of the strip waveguides, and is converted into the TE1 mode after passing through the strip waveguides, and the TE1 mode is input to the ridge waveguides and the slab waveguides, and is converted into the TM0 mode to be output. The polarization converter based on the trapezoidal waveguide structure realizes high-efficiency conversion between TM0 and TE0 polarization states, the process is low complexity and large in tolerance, and the rate of finished products is high.

Description

technical field [0001] The present invention relates to a polarization converter, in particular to a polarization converter based on a trapezoidal waveguide structure. Background technique [0002] Polarization converter is an important device for polarization multiplexing in optical communication. The current polarization converters can be classified into two types. The first one is to use a waveguide with an L-shaped or similar cross-section to realize TM 0 Die and TE 0 Mode direct conversion, the second uses an inverted T-shaped waveguide to achieve TM 0 Die and TE 1 Mode conversion, and then use asymmetric Mach-Zehnder interferometer (MZI) or directional coupler to TE 1 Die conversion to TE 0 mold. The current problems are: [0003] 1. The production of L-shaped waveguides has high requirements for alignment processing accuracy, so the tolerance of this device is small, and the yield rate cannot be guaranteed; [0004] 2. For the asymmetric MZI connected behind th...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that existing polarization converters have the problems of high requirements for machining accuracy, high design difficulty and low yield

Images