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Precise mode control of laser-written waveguides for broadband,low-dispersion 3D integrated optics

Light(Science & Applications) 2024年第6期13卷 1186-1195页

作者： Yuying Wang Lijing Zhong Kuen Yao Lau Xuhu Han Yi Yang Jiacheng Hu Sergei Firstov Zhi Chen Zhijun Ma Limin Tong kin seng chiang Dezhi Tan Jianrong Qiu College of Optical Science and Engineering Zhejiang University310027HangzhouChina Institute of Light+X Science and Technology College of Information Science and EngineeringNingbo University315211NingboChina School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University215006SuzhouChina Prokhorov General Physics Institute of the Russian Academy of Sciences Dianov Fiber Optics Research Center38 Vavilov str.Moscow119333Russia Zhejiang Lab 311121HangzhouChina College of Materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan ProvinceKunming University of Science and Technology650093KunmingYunnanChina Department of Electrical Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong SARChina School of Materials Science and Engineering Zhejiang University310027HangzhouChina

Three-dimensional(3D)glass chips are promising waveguide platforms for building hybrid 3D photonic circuits due to their 3D topological capabilities,large transparent windows,and low coupling *** present,the key challenge in scaling down a benchtop optical system to a glass chip is the lack of precise methods for controlling the mode field and optical coupling of 3D waveguide ***,we propose an overlap-controlled multi-scan(OCMS)method based on laser-direct lithography that allows customizing the refractive index profile of 3D waveguides with high spatial precision in a variety of *** the basis of this method,we achieve variable mode-field distribution,robust and broadband coupling,and thereby demonstrate dispersionless LP21-mode conversion of supercontinuum pulses with the largest deviation of<0.1 dB in coupling ratios on 210 nm *** approach provides a route to achieve ultra-broadband and low-dispersion coupling in 3D photonic circuits,with overwhelming advantages over conventional planar waveguide-optic platforms for on-chip transmission and manipulation of ultrashort laser pulses and broadband supercontinuum.

关键词： waveguide mode dispersion

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Analysis of Corrugated Long-Period Gratings in Planar Waveguides and Their Polarization Dependence

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光学学报 2003年第S1期23卷 147-148页

作者： kin seng chiang Vipul Rastogi Optoelectronics Research Centre and Department of Electronic Engineering City University of Hong Kong Tat Chee Avenue Hong Kong P. R. ChinaOptoelectronics Research Centre and Department of Electronic Engineering City University of Hong Kong Tat Chee Avenue Hong Kong P. R. China

We present a theoretical analysis of corrugated long-period gratings in planar waveguides. In particular, we calculate the transmission spectra for both the TE and TM polarizations and highlight the polarization-indep... 详细信息

关键词： of TE TM mode in Analysis of Corrugated Long-Period Gratings in Planar Waveguides and Their Polarization Dependence Long

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Effects Of Average Index Variation in Apodized Long-Period Fiber Gratings

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Photonic Sensors 2013年第2期3卷 102-111页

作者： Yanju GU kin seng chiang Department of Electronic Engineering City University of Hong Kong Hong Kong SAR China

We analyze the effects of average index variation on the transmission characteristics of an index-apodized long-period fiber grating （LPFG） by the transfer matrix method and study how these effects depend on the grating length, the grating profile, the modal dispersion factor, and the duty cycle of the index modulation. Apart from shifting the resonance wavelength and modifying the rejection band, average index variation can give rise to significant side lobes that may appear on the short-wavelength or long-wavelength side of the rejection band, depending on the signs of the average index change and the modal dispersion factor. Our results provide general guidance for the writing of LPFGs for the minimization of side lobes. Our analysis compares well with published experimental results and should be useful for the design and fabrication of LPFGs.

关键词： Apodization fiber grating long-period fiber grating (LPFG) optical fiber sensor optical filter transfer matrix method

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Recent Developments in Polymer Optical Waveguide Devices

Recent Developments in Polymer Optical Waveguide Devices

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The Eighth Chinese Optoelectronics Symposium

作者： kin seng chiang Department of Electronic Engineering City University of Hong Kong 83 Tat Chee AvenueHong Kong

This paper reviews some of the recent studies at the City University of Hong Kong on polymer optical waveguide devices, which include zero-birefringence waveguides, polarization-insensitive Bragg gratings, polarization-insensitive directional couplers, several types of long-period grating filters, and three-dimensional couplers and switches.

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Optical Sensing Based on Light Coupling Between Two Parallel Long-Period Fiber Gratings

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Photonic Sensors 2011年第3期1卷 204-209页

作者： kin seng chiang Yunqi LIU Qing LIU Yunjiang RAO Department of Electronic Engineering City University of Hong Kong 83 Tat Chee Avenue Hong Kong China Key Laboratory of Optical Fiber Sensing & Communications (Min&try of Education) University of Electronic Scienceand Technology of China Chengdu 611731 China Key Lab of Special Fiber Optics and Optical Access Networks School of Communication and Information EngineeringShanghai University Shanghai 200072 China

A new optical intensity-based sensing mechanism for the measurement of refractive index and minute displacement is proposed in this paper, which is based on modifying the amount of light coupled between two parallel long-period fiber gratings. The characteristics of this sensing mechanism with experiments and simulation results are demonstrated.

关键词： Long-period fiber grating optical fiber sensor refractive-index sensor displacement sensor intensity-based sensor

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Long-period gratings in polymer ridge waveguides

Long-period gratings in polymer ridge waveguides

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Photonics Asia 2004;Optoelectronics,Microelectronics,and Nanotech

作者： kin seng chiang Kar Pong Lor Optoelectronics Research Centre and Department of Electronic Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China Optoelectronics Research Centre and Department of Electronic Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China

In this paper, we report the design and fabrication of a long-period waveguide grating (LPWG) in a polymer ridge waveguide, which has a benzocyclobutene (BCB) core and an epoxy cladding of the same wi

关键词： Long-period gratings, optical filters, optical waveguide filters, polymer waveguides, ridge waveguide, tunable filters.

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可补偿偏置漂移的扭转光纤电流传感器

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光学学报 1999年第7期19卷 981-987页

作者：董小鹏中国科学技术大学电子工程与信息科学系香港城市大学电子工程系

针对扭转光纤电流传感器由于环境因素（如温度、压力、振动）变化使光纤中传输光偏振态改变，从而导致传感器输出信号漂移问题，提出了一种新的信号处理方法进行克服。这一方法适用于交变电流的检测。实验中通过旋转输入线偏振光偏振方... 详细信息

针对扭转光纤电流传感器由于环境因素（如温度、压力、振动）变化使光纤中传输光偏振态改变，从而导致传感器输出信号漂移问题，提出了一种新的信号处理方法进行克服。这一方法适用于交变电流的检测。实验中通过旋转输入线偏振光偏振方向的方法检验了所提方法的有效性，证明这种补偿方法对传感器偏置相位的任意偏移均适用。

关键词：双折射法拉第效应光纤传感器扭转光纤电流

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铌酸锂电光长周期波导光栅

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电子科技大学学报 2009年第5期38卷 544-549页

作者：郑建成金伟刘晴香港城市大学电子工程学系

该文对用铌酸锂制作电光长周期波导光栅的研究进展进行了综述。讨论了用铌酸锂制作长周期光栅的难点,介绍了解决此难点所用的特殊铌酸锂波导的制作原理和方法,再重点论述了对铌酸锂电光长周期波导光栅的研究,包括包层模阶数、铌酸锂波... 详细信息

该文对用铌酸锂制作电光长周期波导光栅的研究进展进行了综述。讨论了用铌酸锂制作长周期光栅的难点,介绍了解决此难点所用的特殊铌酸锂波导的制作原理和方法,再重点论述了对铌酸锂电光长周期波导光栅的研究,包括包层模阶数、铌酸锂波导的结构参数对光栅性能的影响以及光栅的谐振波长的温度灵敏度。研究表明铌酸锂长周期波导光栅的强度和谐振波长可分别由电压和温度调控,使该器件能进一步开发成为新型高速动态光滤波器或调制器。目前在最佳样品中实现25dB光栅强度调控所需的驱动电压不超过49V,其谐振波长的温度灵敏度为-1.0nm/℃。

关键词：电光效应铌酸锂长周期光栅光波导光波导光栅光滤波器

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Perforated peptic ulcer-an update

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World Journal of Gastrointestinal Surgery 2017年第1期9卷 1-12页

作者： kin Tong Chung Vishalkumar G Shelat Department of General Surgery Tan Tock Seng HospitalSingapore 308433Singapore

Peptic ulcer disease(PUD) affects 4 million people worldwide annually. The incidence of PUD has been estimated at around 1.5% to 3%. Perforated peptic ulcer(PPU) is a serious complication of PUD and patients with PPU often present with acute abdomen that carries high risk for morbidity and mortality. The lifetime prevalence of perforation in patients with PUD is about 5%. PPU carries a mortality ranging from 1.3% to 20%. Thirtyday mortality rate reaching 20% and 90-d mortality rate of up to 30% have been reported. In this review we have summarized the current evidence on PPU to update readers. This literature review includes the most updated information such as common causes, clinical features, diagnostic methods, non-operative and operative management, post-operative complications and different scoring systems of PPU. With the advancement of medical technology, PUD can now be treated with medications instead of elective surgery. The classic triad of sudden onset of abdominal pain, tachycardia and abdominal rigidity is the hallmark of PPU. Erect chest radiograph may miss 15% of cases with air under the diaphragm in patients with bowel perforation. Early diagnosis, prompt resuscitation and urgent surgical intervention are essential to improve outcomes. Exploratory laparotomy and omental patch repair remains the gold standard. Laparoscopic surgery should be considered when expertise is available. Gastrectomy is recommended in patients with large or malignant ulcer.

关键词： Peptic ulcer Perforation Laparoscopy Surgery

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带有对称编码的遗传算法在动力学系统中的应用

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电子学报 1999年第2期27卷 59-63页

作者：孟庆春周长久纪洪波烟台大学计算机系清华大学智能技术与系统国家重点实验室

本文通过对动力学系统模型和对带有约束条件的优化控制问题的分析，以系统的动力学优化控制问题为对象，进一步将带有对称编码的遗传算法应用于带有约束条件的优化问题的求解中．根据系统的终点和初始状态，提出了泛横向对称编码和泛纵... 详细信息

本文通过对动力学系统模型和对带有约束条件的优化控制问题的分析，以系统的动力学优化控制问题为对象，进一步将带有对称编码的遗传算法应用于带有约束条件的优化问题的求解中．根据系统的终点和初始状态，提出了泛横向对称编码和泛纵向对称编码理论，为进一步拓展对称编码理论的应用空间提供了理论基础．在讨论了单输入和双输入的系统模型后，由定理１、定理２和定理３描述了对称编码自动满足系统的终点和初始状态约束的特点，这一理论的初步应用成果表明，以对称编码理论为核心的遗传算法的性能远好于普通的遗传算法，并可望其在机器学习、神经网络技术等领域中得到进一步应用．

关键词：遗传算法动力学控制对称编码泛对称编码

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