On-chip integrated polarization beam splitter and polarization beam splitting method thereof
A polarization beam splitter and integrated technology, applied in the field of integrated optics, can solve the problems of large waveguide size, low refractive index, and low optical signal mode field limitation, and achieve large working bandwidth, large device manufacturing tolerance, and compact structure. Effect
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[0033] Example 1: as Figure 1 to Figure 2 Shown is the structure diagram of the first embodiment of the present invention, which includes:
[0034]Substrate 5, a hybrid plasma waveguide 1 is arranged on the substrate 5, a taper-type coupling waveguide, an S-bend waveguide 3 and an output silicon waveguide 4 with the same thickness; the taper-type coupling waveguide, the S-bend waveguide 3 and the output silicon waveguide 4 are sequentially In series and located on the same side of the hybrid plasmonic waveguide 1, the taper-type coupling waveguide is arranged in parallel with the hybrid plasmonic waveguide 1; the hybrid plasmonic waveguide 1 is divided into metal cladding layers 1-5, upper silicon dioxide layers 1-4, nitrogen The thickness of the silicon waveguide layer 1-3, the lower silicon dioxide layer 1-2 and the silicon waveguide layer 1-1; the thickness of the coupling waveguide 2, the S-bend waveguide 3 and the output silicon waveguide 4 is the same as that of the sil...
Example Embodiment
[0039] Example 2: Figure 8 In the second embodiment of the present invention, an improved multi-mode interference coupler is used instead of the taper-type directional coupler to couple out the TE mode. The multi-mode interference coupler is a rectangular waveguide. In order to reduce the reflection loss of the multi-mode interference coupler, we truncate the corner of the input end of the multi-mode interference coupler away from the hybrid plasma waveguide 1, which can effectively reduce the input and Influence of partial reflection loss on transmission performance due to structural size mismatch between output waveguide and multimode interference coupler. By optimizing the width and longitudinal transmission length of the multimode interference coupler, two high-performance linearly polarized modes, TE and TM modes, can be obtained at the output.
Example Embodiment
[0040] Example 3: Figure 9 The third embodiment of the present invention includes: a substrate 5, on which a hybrid plasma waveguide 1 is provided, and a first coupling waveguide 2-1 and a second coupling waveguide 2- are respectively provided on both sides of the hybrid plasma waveguide 1 2. The distances between the first coupling waveguide 2-1 and the second coupling waveguide 2-2 are equal to the hybrid plasma waveguide 1; the output end of the first coupling waveguide 2-1 is connected to the first output through the first S-bend waveguide 3-1 The silicon waveguide 4-1 is connected; the output end of the second coupling waveguide 2-2 is connected to the second output silicon waveguide 4-2 through the second S-bend waveguide 3-2; the hybrid plasma waveguide 1 is divided into metal coverings from top to bottom Layer 1-5, upper silicon dioxide layer 1-4, silicon nitride waveguide layer 1-3, lower silicon dioxide layer 1-2 and silicon waveguide layer 1-1; first coupling waveg...
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