Silica-based planar lightwave circuit(PLC)devices can reduce transmission loss and cost in a quantum key distribution(QKD)system,and have potential applications in integration and production.A PLC-based quantum decodi...Silica-based planar lightwave circuit(PLC)devices can reduce transmission loss and cost in a quantum key distribution(QKD)system,and have potential applications in integration and production.A PLC-based quantum decoding integrated chip for multi-protocols is designed and fabricated,which is composed of variable optical splitters(VOSs),asymmetric Mach-Zehnder interferometers(AMZIs),and variable directional couplers(VDCs).Balanced pulse-pairs of four outputs are obtained simultaneously with measured delay times of 405 ps and 402 ps,respectively.The chip has advantages in achieving high interference visibility and low quantum bit error rate(QBER).展开更多
A 16-channel variable attenuator multiplexer/demultiplexer （VMUX） device is demonstrated. The VM UX is based on a rib-type structure on a silicon-on-insulator （SOI） platform. It consists of a 100-GHz arrayed waveg...A 16-channel variable attenuator multiplexer/demultiplexer （VMUX） device is demonstrated. The VM UX is based on a rib-type structure on a silicon-on-insulator （SOI） platform. It consists of a 100-GHz arrayed waveguide grating （AWG） and an electro-optic variable optical attenuator （VOA） array with a p-i-n lateral diode structure. The insertion loss of the demonstrated device is about 9.1 dB and the corresponding crosstalk is about 10 dB. The injected current of the VOA is 60.74 mA at 20 dB attenuation and the whole area of the device is 2.9 × 1 mm2. The VMUX performs an excellent function of wavelength demultiplexing and optical power balancing in 16 channels.展开更多
In recent years, the silica-on-silicon based multimode interference （MMI） optical waveguide is an interesting research topic. It is being advanced various researches on the silica based MMI coupler. This paper repre...In recent years, the silica-on-silicon based multimode interference （MMI） optical waveguide is an interesting research topic. It is being advanced various researches on the silica based MMI coupler. This paper represents the considerations of the optimal design of the silica-on-silicon based MMI optical coupler for better performance. For that, we have illustrated the simulation results on a particular case of the 4x4 silica-on-silicon based MMI coupler. From the simulation results, it is seen that the performance of the MMI coupler depends on multiple width and length combinations of the MMI waveguide. The results also show that the width of the multimode waveguide could not be too small or too large for optimal performance, and at the widths, 100~tm, 120~tm and 130~tm, the performance could be optimized and be almost 0.62 - 0.64 in a given length range. Finally, the results have been compared with the optical coupler presently available in the market and show that the silica-on-silicon based MMI coupler is much more efficient in terms of losses and the performance associated with it and the size of the coupler.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2018YFA0306403)the National Nature Science Foundation of China(Grant No.61805232).
文摘Silica-based planar lightwave circuit(PLC)devices can reduce transmission loss and cost in a quantum key distribution(QKD)system,and have potential applications in integration and production.A PLC-based quantum decoding integrated chip for multi-protocols is designed and fabricated,which is composed of variable optical splitters(VOSs),asymmetric Mach-Zehnder interferometers(AMZIs),and variable directional couplers(VDCs).Balanced pulse-pairs of four outputs are obtained simultaneously with measured delay times of 405 ps and 402 ps,respectively.The chip has advantages in achieving high interference visibility and low quantum bit error rate(QBER).
基金supported by the National High Technology Research and Development Program of China(No.2013AA031402)
文摘A 16-channel variable attenuator multiplexer/demultiplexer （VMUX） device is demonstrated. The VM UX is based on a rib-type structure on a silicon-on-insulator （SOI） platform. It consists of a 100-GHz arrayed waveguide grating （AWG） and an electro-optic variable optical attenuator （VOA） array with a p-i-n lateral diode structure. The insertion loss of the demonstrated device is about 9.1 dB and the corresponding crosstalk is about 10 dB. The injected current of the VOA is 60.74 mA at 20 dB attenuation and the whole area of the device is 2.9 × 1 mm2. The VMUX performs an excellent function of wavelength demultiplexing and optical power balancing in 16 channels.
文摘In recent years, the silica-on-silicon based multimode interference （MMI） optical waveguide is an interesting research topic. It is being advanced various researches on the silica based MMI coupler. This paper represents the considerations of the optimal design of the silica-on-silicon based MMI optical coupler for better performance. For that, we have illustrated the simulation results on a particular case of the 4x4 silica-on-silicon based MMI coupler. From the simulation results, it is seen that the performance of the MMI coupler depends on multiple width and length combinations of the MMI waveguide. The results also show that the width of the multimode waveguide could not be too small or too large for optimal performance, and at the widths, 100~tm, 120~tm and 130~tm, the performance could be optimized and be almost 0.62 - 0.64 in a given length range. Finally, the results have been compared with the optical coupler presently available in the market and show that the silica-on-silicon based MMI coupler is much more efficient in terms of losses and the performance associated with it and the size of the coupler.
