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Broadband picometer-scale resolution on-chip spectrometer with reconfigurable photonics

Light(Science & Applications) 2023年第7期12卷 1415-1424页

作者： Chunhui Yao Minja Chen Ting Yan Liang Ming qixiang cheng Richard Penty Centre for Photonic Systems Electrical Engineering DivisionDepartment of EngineeringUniversity of CambridgeCambridge CB3 OFAUK GlitterinTech Limited Xuzhou 221000China

Miniaturization of optical spectrometers is important to enable spectroscopic analysis to play a role in in situ,or even in vitro and in vivo characterization ***,scaled-down spectrometers generally exhibit a strong trade-off between spectral resolution and operating bandwidth,and are often engineered to identify signature spectral peaks only for specific *** this paper,we propose and demonstrate a novel global sampling strategy with distributed filters for generating ultra-broadband pseudo-random spectral *** geometry of all-pass ring filters is tailored to ensure small self-and cross-correlation for effective information acquisition across the whole spectrum,which dramatically reduces the requirement on sampling *** employ the power of reconfigurable photonics in spectrum shaping by embedding the engineered distributed *** a moderate mesh of MZls,we create 256 diverse spectral responses on a single chip and demonstrate a resolution of 20 pm for single spectral lines and 30 pm for dual spectral lines over a broad bandwidth of 115 nm,to the best of our knowledge achieving a new record of bandwidth-to-resolution *** simulations reveal that this design will readily be able to achieve single-picometer-scale *** further show that the reconfigurable photonics provides an extra degree of programmability,enabling user-defined features on resolution,computation complexity,and relative *** use of SiN integration platform enables the spectrometer to exhibit excellent thermal stability of±2.0℃,effectively tackling the challenge of temperature variations at picometer-scale resolutions.

关键词： reconfigurable resolution enable

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Advances in cost-effective integrated spectrometers

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Light(Science & Applications) 2022年第7期11卷 1379-1396页

作者： Ang Li Chunhui Yao Junfei Xia Huijie Wang qixiang cheng Richard Penty Yeshaiahu Fainman Shilong Pan Key Laboratory of Radar Imaging and Microwave Photonics Ministry of EducationNanjing University of Aeronautics and AstronauticsNanjing 210016China Litin Technology XuzhouJiangsuChina Department of Engineering University of Cambridge9 JJ Thomson AvenueCambridge CB30FAUK Colllege of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Electrical and Computer Engineering University of California at San DiegoLa JollaCAUSA

The proliferation of Internet-of-Things has promoted a wide variety of emerging applications that require compact,lightweight,and low-cost optical *** substantial progresses have been made in the miniaturization of spectrometers,most of them are with a major focus on the technical side but tend to feature a lower technology readiness level for *** importantly,in spite of the advancement in miniaturized spectrometers,their performance and the metrics of real-life applications have seldomly been connected but are highly *** review paper shows the market trend for chip-scale spectrometers and analyzes the key metrics that are required to adopt miniaturized spectrometers in real-life *** progress addressing the challenges of miniaturization of spectrometers is summarized,paying a special attention to the CMOS-compatible fabrication platform that shows a clear pathway to massive *** for ways forward are also presented.

关键词： cost summarized spite

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Bridging the gap between resonance and adiabaticity:a compact and highly tolerant vertical coupling structure

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Photonics Research 2022年第9期10卷 2081-2090页

作者： CHUNHUI YAO qixiang cheng GüNTHER ROELKENS RICHARD PENTY Centre for Photonic Systems Electrical Engineering DivisionDepartment of EngineeringUniversity of CambridgeCambridge CB3 OFAUK Department of Information Technology(INTEC) Photonics Research GroupGhent University-imec9052 Ghent Belgium

We present a compact,highly tolerant vertical coupling structure,which can be a generic design that bridges the gap between conventional resonant couplers and adiabatic couplers for heterogeneously integrated *** show insights on relaxing the coupler alignment tolerance and provide a detailed design *** the use of a multisegmented inverse taper structure,our design allows a certain proportion of the odd supermode to be excited during the coupling process,which simultaneously facilitates high tolerance and *** a total length of 87μm,our coupler is almost threefold shorter than the state-of-the-art alignment-tolerant adiabatic couplers and outperforms them by demonstrating a more than 94%coupling efficiency(for<0.3 d B coupling loss)with±1μm misalignment tolerance,which,to our best knowledge,is a new record for III-V-on-silicon vertical ***,our design has high tolerance to fabrication-induced structural deformation and ultrabroad *** features make it particularly suitable for building densely integrated III-V-onsilicon photonic circuits with commercially available microtransfer printing assembly *** proposed design can be widely adopted in various integration platforms.

关键词： coupling adiabatic structure

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Iterative photonic processor for fast complexvalued matrix inversion

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Photonics Research 2022年第11期10卷 2488-2501页

作者： MINJIA CHEN qixiang cheng MASAFUMI AYATA MARK HOLM RICHARD PENTY Department of Engineering Centre for Photonic SystemsElectrical Engineering DivisionUniversity of CambridgeCambridge CB30FAUK Huawei Technologies(Sweden)AB 16440 KistaSweden

An N×N iterative photonic processor is proposed for the first time, we believe, for fast computation of complexvalued matrix inversion, a fundamental but computationally expensive linear algebra operation. Compared to traditional digital electronic processing, optical signal processing has a few unparalleled features that could enable higher representational efficiency and faster computing speed. The proposed processor is based on photonic integration platforms–the inclusion of Ⅲ-V gain blocks offers net neutral loss in the phase-sensitive loops. This is essential for the Richardson iteration method that is adopted in this paper for complex linear systems. Wavelength multiplexing can be used to significantly improve the processing efficiency, allowing the computation of multiple columns of the inverse matrix using a single processor core. Performances of the key building blocks are modeled and simulated, followed by a system-level analysis, which serves as a guideline for designing an N×N Richardson iteration processor. An inversion accuracy of>98%can be predicted for a 64×64 photonic processor with a>80times faster inversion rate than electronic processors. Including the power consumed by both active components and electronic circuits, the power efficiency of the proposed processor is estimated to be over an order of magnitude more energy-efficient than electronic processors. The proposed iterative photonic integrated processor provides a promising solution for future optical signal processing systems.

关键词： valued matrix iteration

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Harnessing self-heating effect for ultralow-crosstalk electro-optic Mach–Zehnder switches

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Photonics Research 2023年第10期11卷 1757-1769页

作者： PENG BAO qixiang cheng JINLONG WEI GIUSEPPE TALLI MAXIM KUSCHNEROV RICHARD V.PENTY Centre for Photonic Systems Electrical Engineering DivisionDepartment of EngineeringUniversity of CambridgeCambridge CB30FAUK Huawei Technologies Duesseldolf GmbH European Research Center80992 MunichGemany Current address:Peng cheng Laboratory Shenzhen 518000China

This paper presents a novel approach to counterbalance free-carrier-absorption(FCA) in electro-optic(E-O)Mach–Zehnder interferometer(MZI) cells by harnessing the self-heating effect. We show insights on crosstalk limitations in MZIs with direct carrier-injection and provide a detailed design methodology on a differential phase shifter pair. Leveraging both free-carrier dispersion(FCD) and self-heating effects, our design enables arbitrary phase tuning with balanced FCA loss in the pair of arms, eliminating the need for additional phase corrections and creating ultralow crosstalk MZI elements. This neat design disengages from the commonly used nested structure, thus providing an opportunity of embedding tunable couplers for correcting imperfect splitting ratios given that only two are needed. We show that with the use of tunable directional couplers, a standard±10 nm process variation is tolerated, while achieving a crosstalk ratio below-40 dB. By direct carrier injection in both arms, the proposed device operates at nanosecond scales and can bring about a breakthrough in the scalability of E-O switch fabrics, as well as other silicon integrated circuits that have stringent requirements for crosstalk leakage.

关键词： crosstalk interferometer breakthrough

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Ultralow-crosstalk,strictly non-blocking microring-based optical switch

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Photonics Research 2019年第2期7卷 155-161页

作者： qixiang cheng LIANG YUAN DAI NATHAN C.ABRAMS YU-HAN HUNG PADRAIC E.MORRISSEY MADELEINE GLICK PETER O’BRIEN KEREN BERGMAN Department of Electrical Engineering Columbia UniversityNew York Tyndall National Institute University College Cork

We report on the first monolithically integrated microring-based optical switch in the switch-and-select architecture. The switch fabric delivers strictly non-blocking connectivity while completely canceling the first-order crosstalk. The 4 × 4 switching circuit consists of eight silicon microring-based spatial(de-)multiplexers interconnected by a Si/SiN dual-layer crossing-free central shuffle. Analysis of the on-state and off-state power transfer functions reveals the extinction ratios of individual ring resonators exceeding 25 dB, leading to switch crosstalk suppression of up to over 50 dB in the switch-and-select topology. Optical paths are assessed, showing losses as low as 0.1 dB per off-resonance ring and 0.5 dB per on-resonance ring. Photonic switching is actuated with integrated micro-heaters to give an ～24 GHz passband. The fully packaged device is flip-chip bonded onto a printed circuit board breakout board with a UV-curved fiber array.

关键词： Ultralow-crosstalk strictly non-blocking

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短周期AlGaAs/GaAs超晶格的MOCVD生长及X射线衍射研究

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固体电子学研究与进展 2000年第2期20卷 212-215页

作者：王向武程祺祥南京电子器件研究所 210016

生长了短周期 Al Ga As/ Ga As超晶格 ,并通过双晶 X射线衍射谱 ,对 MOCVD超薄层Al Ga As、Ga As的生长进行了研究。从衍射谱卫星峰的级数及 Pendellosong干涉条纹的出现 ,定性地对晶格结构及界面作出评价。 X光衍射测量结果与 HEMT... 详细信息

生长了短周期 Al Ga As/ Ga As超晶格 ,并通过双晶 X射线衍射谱 ,对 MOCVD超薄层Al Ga As、Ga As的生长进行了研究。从衍射谱卫星峰的级数及 Pendellosong干涉条纹的出现 ,定性地对晶格结构及界面作出评价。 X光衍射测量结果与 HEMT结构电学性能测试结果有较好的对应关系。

关键词：超晶格 X射线衍射 MOCVD 砷化镓

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SDD60射孔定位点火仪

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石油仪器 2005年第2期19卷 48-49,52页

作者：程启祥胜利石油管理局测井公司

为了满足电缆输送射孔作业的需求和提高射孔技术与装备的技术水平,研制开发了新型SDD60射孔定位点火仪。它主要由电缆头、打捞帽、密封接头、磁定位总成、点火总成和挂接头组成,适用于60mm以上有枪身射孔器的电缆输送射孔作业。实验和... 详细信息

为了满足电缆输送射孔作业的需求和提高射孔技术与装备的技术水平,研制开发了新型SDD60射孔定位点火仪。它主要由电缆头、打捞帽、密封接头、磁定位总成、点火总成和挂接头组成,适用于60mm以上有枪身射孔器的电缆输送射孔作业。实验和现场使用表明,SDD60射孔定位点火仪结构简单、性能可靠、使用维护方便。

关键词：射孔定位点火器测井电缆测井信号高温高压

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浅谈我国中厚板的设备及生产

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冶金设备管理与维修 2001年第1期19卷 43-45页

作者：帅奇陈启祥济钢中厚板厂组干部，济南250101

中厚板材的生产是国民经济发展的支柱产业，深入地研究中厚板材的生产及设备，对我国国民经济发展具有重要意义。重点论述我国目前中厚板轧机的设备水平和专用板生产状况，指出了存在的问题及不足，明确提出了我国中厚板轧机的发展方向... 详细信息

中厚板材的生产是国民经济发展的支柱产业，深入地研究中厚板材的生产及设备，对我国国民经济发展具有重要意义。重点论述我国目前中厚板轧机的设备水平和专用板生产状况，指出了存在的问题及不足，明确提出了我国中厚板轧机的发展方向和定位。

关键词：轧机中厚板品种板轧制力产品质量精炼发展中国

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远红外理疗贴穴位敷贴联合声治疗干预特发性耳鸣临床观察

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光明中医 2020年第14期35卷 2185-2187页

作者：程启翔纪波波李明上海市松江区车墩镇社区卫生服务中心中医科上海201611 上海中医药大学附属岳阳中西医结合医院上海200437

目的评价远红外理疗贴穴位敷贴联合声治疗干预特发性耳鸣的疗效。方法选取以耳鸣为第一主诉的特发性耳鸣患者90例,随机分为远红外理疗贴敷贴组、远红外理疗贴内衬王不留行籽组(即联合组)及单纯声治疗组,每组30例。每组均由同一专家给予... 详细信息

目的评价远红外理疗贴穴位敷贴联合声治疗干预特发性耳鸣的疗效。方法选取以耳鸣为第一主诉的特发性耳鸣患者90例,随机分为远红外理疗贴敷贴组、远红外理疗贴内衬王不留行籽组(即联合组)及单纯声治疗组,每组30例。每组均由同一专家给予专业的耳鸣咨询,在此基础上进行声音治疗。远红外理疗贴敷贴组、联合组选取人迎穴和扶突穴进行敷贴治疗,每日1次,5周为一个疗程。分析红外理疗贴穴位敷贴联合声治疗干预特发性耳鸣的疗效。结果敷贴组、联合组、声治疗组的总有效率分别为73.3%、76.7%、63.3%,敷贴组与声治疗组、联合组与声治疗组之间差异具有统计学意义(P0.05)。结论远红外理疗贴穴位敷贴联合声治疗干预特发性耳鸣是一种有效方法。远红外理疗贴内衬王不留行籽有效率虽然最高,但不具备临床使用意义。

关键词：特发性耳鸣远红外理疗贴穴位敷贴

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