A kind of polarization beam splitter structure and polarization beam splitting method

Abstract

The invention discloses a polarization beam splitter structure and a polarization beam splitting method. The input area includes an input waveguide structure 1 with a strip straight waveguide structure and an input waveguide structure 2 with a ridge straight waveguide structure. The coupling area includes a coupling waveguide structure 1 with a strip straight waveguide structure and a coupling waveguide structure 2 with a ridge straight waveguide structure, the input port of the coupling waveguide structure 1 is connected to the output port of the input waveguide structure 1, and the coupling waveguide structure 2 The input port is connected with the output port of the input waveguide structure two. Its output area includes an output waveguide structure 1 with a strip straight waveguide structure and an output waveguide structure 2 with a ridge-shaped straight waveguide structure, the input port of the output waveguide structure 1 is connected to the output port of the coupling waveguide structure 1, and the output waveguide structure 2 The input port is connected with the output port of the second coupling waveguide structure. The beam splitter of the invention has the advantages of compact structure, 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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