Beijing Zhongke Guoguang Quantum Technology Co., Ltd.

International Business Machines Corporation

Beijing Zhongke Guoguang Quantum Tech. Co., Ltd.

Dongsheng Chen

Dong Wang

Yibo Zhao

Xiaobo Wang

Hong Min

Terence Patrick Purcell

Yefim Shuf

Zhongliang Zhang

The present application discloses an integrated self-coherent receiving optical chip based on round-trip delay interferometers, including a first beam splitter, a multi-port circulator array, a first round-trip delay interferometer and a second round-trip delay interferometer integrated on a same substrate, wherein the first beam splitter is connected to the multi-port circulator array, and the multi-port circulator array is connected to the first round-trip delay interferometer and the second round-trip delay interferometer, respectively.

Integrated self-coherent receiving optical chip based on round-trip delay interferometers

Disclosed is a self-coherent receiver based on polarization-independent delay interferometers, relating to a technical field of optical communication, including a first beam splitter, a first circulator, a second circulator, a first polarization-independent delay interferometer, a second polarization-independent delay interferometer, a first balanced detector, a second balanced detector and an electrical signal processing module.

Self-coherent receiver based on polarization-independent delay interferometers

The application discloses a polarization independent DQPSK demodulation integrated optical chip, which comprises a first beam splitter, a first polarization beam splitter rotator, a second beam splitter, a third beam splitter, a first quarter-wave plate, a first delayed optical waveguide, and a second polarization beam splitter rotator that are integrated on a same substrate.

Polarization independent DQPSK demodulation integrated optical chip

Disclosed is a self-coherent receiver based on single delay interferometer, comprising a first beam splitter, a first circulator, a second circulator, a double path bidirectional multiplexing delay interferometer, a first balanced detector, a second balanced detector and an electrical signal processing module.

Self-coherent receiver based on single delay interferometer

Techniques for generating a set of one or more materialized query table (MQT) candidates for a workload are provided. The techniques include receiving a workload, wherein the workload comprises a set of one or more queries, generating one or more best matching MQTs (BMQTs) based on one or more query blocks of the one or more queries by removing syntax that is not qualified for a MQT re-write, determining one or more frequently used multi-joins in the workload, using the one or more BMQTs and the one or more frequently used multi-joins to generate a set of one or more workload MQTs (WMQTs), and grouping one or more WMQTs and one or more BMQTs into one or more groups to merge into a set of a smaller number of MQTs and to cover the workload.

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Beijing, China

Dongsheng Chen