Negative Interresonator Coupling Structure Enclosed in Waveguide Resonator Filter

AbstractHigh quality-factor (Q) optical resonators are a key component for ultra-narrow linewidth lasers, frequency stabilization, precision spectroscopy and quantum applications. Integration in a photonic waveguide platform is key to reducing cost, size, power and sensitivity to environmental disturbances. However, to date, the Q of all-waveguide resonators has been relegated to below 260 Million. Here, we report a Si3N4 resonator with 422 Million intrinsic and 3.4 Billion absorption-limited Qs. The resonator has 453 kHz intrinsic, 906 kHz loaded, and 57 kHz absorption-limited linewidths and the corresponding 0.060 dB m−1 loss is the lowest reported to date for waveguides with deposited oxide upper cladding. These results are achieved through a careful reduction of scattering and absorption losses that we simulate, quantify and correlate to measurements. This advancement in waveguide resonator technology paves the way to all-waveguide Billion Q cavities for applications including nonlinear optics, atomic clocks, quantum photonics and high-capacity fiber communications.

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High Gain Beam Scanning Antenna Based on Substrate Integrated Waveguide Resonator TE440 Mode

2020 International Conference on Microwave and Millimeter Wave Technology (ICMMT) ◽

10.1109/icmmt49418.2020.9386997 ◽

2020 ◽

Author(s):

Wenyu Ma ◽

Wenquan Cao ◽

Bangning Zhang

Keyword(s):

High Gain ◽

Substrate Integrated Waveguide ◽

Waveguide Resonator ◽

Beam Scanning ◽

Scanning Antenna

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Dynamic Repair and Robust Optimization of Complex Networks

Mathematical Problems in Engineering ◽

10.1155/2020/4131502 ◽

2020 ◽

Vol 2020 ◽

pp. 1-7

Author(s):

Pengtao Zhang ◽

Peng Bai ◽

Chaoqi Fu ◽

Shanshan Li

Keyword(s):

Energy Transfer ◽

Repair Process ◽

Recovery Efficiency ◽

Repair Strategy ◽

Coupling Structure ◽

Secondary Failure ◽

Fundamental Reason ◽

Network Functions ◽

The Impact ◽

Failure Node

Network repair is indispensable for maintaining network security. Conventional static repair is relatively inefficient. In this study, by considering the energy transfer between nodes, a dynamic repair model was established. The fundamental reason for the secondary failure of repaired nodes during the dynamic repair process is the coupling structure of failure networks. A dynamic repair strategy was proposed that can effectively prevent the secondary failure of repair nodes influenced by energy during repair and can cause the redundant capacity of repair nodes to be used reasonably. By turning off the energy transfer function of the link to control the excessive flow of energy into the repair node to avoid the occurrence of secondary failure; on the other hand, by sharing part of the load of the failure node, realize the rational use of the redundant capacity of the repair node to reduce the impact of the failure node on the overall function of the network. The proposed strategy mitigated the effect of failure nodes on network functions and substantially improved the recovery efficiency of network functions. Furthermore, redundant edges, behaving as energy redundant links in a network structure, can considerably improve the robustness of the network by optimizing the removal of redundant edges. Dynamic repair is not only an efficient repair method but also a highly flexible choice for network repair.

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