Optical multiport spectral phase encoder
AssigneeNational Institute of Information and Communications Technology
InventorsNaoya Wada, Gabriella Cincotti, Xu Wang, Kenichi Kitayama
Life of this patent
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Abstract
Data security of a multi-dimensional code system is increased. An optical device is provided with a single input port; a splitter splitting an input light from the input port into a plurality of lights; a plurality of phase shifters each shifting one of the lights split by the splitter; a multi-port encoder/decoder inputting the lights whose phases are shifted by the phase shifters and generating spectral encoded codes; and a plurality of output ports outputting the spectral encoded codes generated by the multi-port encoder/decoder.
Claims7
An optical device comprising:
- an input port (Pi);
- a splitter (SP) splitting an input light from the input port (Pi) into a plurality of coherent copies of the input light simultaneously, the input light being a coherent light;
- a plurality of waveguides connected with the splitter (SP), each of the plurality of coherent copies of the input light passing on each of the waveguides;
- a plurality of phase shifters (PS), inserted along with each of the waveguides, wherein each of phase shifters (PS) is capable of shifting the light split by the splitter (SP);
- a multi-port encoder/decoder (RID), the multi-port encoder/decoder (E/D) being connected with all of the waveguides, all of the light from the phase shifters (PS) being input into the multi-port encoder/decoder (E/D), wherein the multi-port encoder/decoder (E/D) encodes all of the input light from the phase shifters simultaneously so that it generates spectral encoded codes simultaneously;
- and
- a plurality of output ports (Po), the output ports (Po) being connected with the multi-port encoder/decoder (E/D), the output ports (Po) outputting the spectral encoded codes generated by the multi-port encoder/decoder (E/D);
- wherein the multi-port encoder/decoder (E/D) comprising:
- a first coupler, the first coupler being a single-piece slab coupler, the first coupler having a plurality of input waveguides, each of the input waveguides being connected with one of the phase shifters (PS);
- a second coupler, the second coupler being a slab coupler, the second coupler having a plurality of output waveguides, each of the output waveguides being connected with the output ports (Po);
- and
- a plurality of connecting waveguides, the connecting waveguides connecting the first coupler and the second coupler, each of the connecting waveguides differs its length.
Dependencies are inferred from the claim text.