Polarization beam splitter structure and polarization beam splitting method

Abstract

The invention discloses a polarization beam splitter structure and a polarization beam splitting method, of which the input area of the polarization beam splitter structure comprises a first input waveguide structure of a strip-shaped straight waveguide structure and a second input waveguide structure of a ridge-shaped straight waveguide structure. A coupling area comprises a first coupling waveguide structure of a strip-shaped straight waveguide structure and a second coupling waveguide structure of a ridge-shaped straight waveguide structure, wherein an input port of the first coupling waveguide structure is connected with an output port of the first input waveguide structure, and an input port of the second coupling waveguide structure is connected with an output port of the second input waveguide structure. An output area comprises a first output waveguide structure of a strip-shaped straight waveguide structure and a second output waveguide structure of a ridge-shaped straight waveguide structure, wherein an input port of the first output waveguide structure is connected with an output port of the first coupling waveguide structure, and an input port of the second output waveguide structure is connected with an output port of the second coupling waveguide structure. The beam splitter is compact in structure, and can realize the characteristics of large process tolerance, low insertion loss, high extinction ratio, wide transmission bandwidth and the like.

Description

technical field [0001] The invention belongs to the field of photon integration, and in particular relates to a polarization beam splitter structure and a polarization beam splitting method. Background technique [0002] The rapid development of photonic integration mainly depends on the successful development and application of a large number of functional devices with low insertion loss and compact structure. A serious problem usually exists in devices with small waveguide dimensions: the birefringence phenomenon cannot be eliminated, which leads to large phase differences between different modes, which seriously deteriorates the performance of photonic integrated devices. In addition, in the field of optical communication long-distance transmission, polarization multiplexing technology has been successfully applied to expand the transmission capacity of communication systems. To enable individual control of the polarization states, the transverse electric mode (TE) and t...

AI Technical Summary

Problems solved by technology

A serious problem usually exists in devices with small waveguide dimensions: the birefringence cannot be eliminated, which leads to a large phase difference between different modes, which seriously deteriorates the performance of photonic integrated devices

Among them, the manufacturing process of the nano-groove structure requires high requirements; the manufacturing tolerance of the bridge waveguide structure to the waveguide width and waveguide spacing is relatively small, and the insertion loss is relatively large; although the tapered waveguide structure can achieve high extinction ratio and large process tolerance Polarization Beam splitters, but the device is not compact enough and requires special design

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