A quantum key distribution transmitter chip based on hybrid-integration of silica planar light-wave circuit(PLC)and lithium niobates(LN)modulator PLC is presented.The silica part consists of a tunable directional coup...A quantum key distribution transmitter chip based on hybrid-integration of silica planar light-wave circuit(PLC)and lithium niobates(LN)modulator PLC is presented.The silica part consists of a tunable directional coupler and 400-ps delay line,and the LN part is made up of a Y-branch,with electro-optic modulators on both arms.The two parts are facet-coupled to form an asymmetric Mach-Zehnder interferometer.We successfully encode and decode four BB84 states at 156.25-MHz repetition rate.Fast phase-encoding of 0 orπis achieved,with interference fringe visibilities 78.53%and 82.68%for states|+〉and|-〉,respectively.With the aid of an extra off-chip LN intensity modulator,two time-bin states are prepared and the extinction ratios are 18.65 dB and 15.46 dB for states|0〉and|1〉,respectively.展开更多
An ultra-compact hybrid-integration receiver optical subassembly(ROSA) with four channels is demonstrated in our laboratory with the size of 23.3 mm × 6.0 mm × 6.5 mm. The ROSA is comprised of a planar light...An ultra-compact hybrid-integration receiver optical subassembly(ROSA) with four channels is demonstrated in our laboratory with the size of 23.3 mm × 6.0 mm × 6.5 mm. The ROSA is comprised of a planar lightwave circuit(PLC) arrayed waveguide grating(AWG) chip, a top-illuminated positive-intrinsic-negative photodetector array chip, and a three-dimensional microwave circuit that is specially designed for compact packaging. For each transmission lane, the -3 dB bandwidth of the ROSA is up to 20 GHz, and the maximum responsivity is up to 0.53 A/W. The proposed package structure can be used for smaller package sizes and would be an easy assembling solution for 100 GbE optical communication devices.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2018YFA0306403)the National Natural Science Foundation of China(Grant Nos.61435013 and 61627820)+1 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB43000000)the K.C.Wong Education Foundation,Anhui Initiative in Quantum Information Technologies,China(Grant No.AHY030000)。
文摘A quantum key distribution transmitter chip based on hybrid-integration of silica planar light-wave circuit(PLC)and lithium niobates(LN)modulator PLC is presented.The silica part consists of a tunable directional coupler and 400-ps delay line,and the LN part is made up of a Y-branch,with electro-optic modulators on both arms.The two parts are facet-coupled to form an asymmetric Mach-Zehnder interferometer.We successfully encode and decode four BB84 states at 156.25-MHz repetition rate.Fast phase-encoding of 0 orπis achieved,with interference fringe visibilities 78.53%and 82.68%for states|+〉and|-〉,respectively.With the aid of an extra off-chip LN intensity modulator,two time-bin states are prepared and the extinction ratios are 18.65 dB and 15.46 dB for states|0〉and|1〉,respectively.
基金supported by the National Natural Science Foundation of China(NSFC)(Nos.61625504,61727815,61535014,61527820,and 11674313)
文摘An ultra-compact hybrid-integration receiver optical subassembly(ROSA) with four channels is demonstrated in our laboratory with the size of 23.3 mm × 6.0 mm × 6.5 mm. The ROSA is comprised of a planar lightwave circuit(PLC) arrayed waveguide grating(AWG) chip, a top-illuminated positive-intrinsic-negative photodetector array chip, and a three-dimensional microwave circuit that is specially designed for compact packaging. For each transmission lane, the -3 dB bandwidth of the ROSA is up to 20 GHz, and the maximum responsivity is up to 0.53 A/W. The proposed package structure can be used for smaller package sizes and would be an easy assembling solution for 100 GbE optical communication devices.
