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Investigation on wavelength switching of widely tunable SGDBR lasers

chinese science Bulletin 2009年第20期54卷 3709-3715页

作者： JIANG Shan DONG Lei ZHANG RuiKang XIE ShiZhong Accelink Technologies Co. Ltd. Wuhan 430074 China School of Information science and Engineering Shandong University Jinan 250100 China Department of Electronic Engineering Tsinghua University Beijing 100084 China

The sampled-grating distributed Bragg reflector(SGDBR) laser is a typical and important photonic integrated device,and has potential wide application to agile optical networks.A new dynamic model for this device has been developed,which combines the traveling-wave method for the active region and the transfer-matrix method for the passive sections into a single *** behaviors of wave-length switching of the SGDBR laser,which include the transient spectrum and mode competition,have been studied in detail using this model.A new efficient way has been proposed to improve the wavelength switching performance only by increasing the coupling coefficients without changing the carrier density.

关键词：可调谐激光器分布布拉格反射镜光子集成器件动态模型波长交换取样光栅开关性能耦合系数

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Efficient separating orbital angular momentum mode with radial varying phase

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photonics Research 2017年第4期5卷 267-270页

作者： CHENG LI SHENGMEI ZHAO Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education

It is shown that orbital angular momentum(OAM) is a promising new resource in future classical and quantum communications. However, the separation of OAM modes is still a big challenge. In this paper, we propose a simple and efficient separation method with a radial varying phase. In the method, specific radial varying phases are designed and modulated for different OAM modes. The resultant beam is focused to the spots with different horizontal and vertical positions after a convex lens, when the coordinate transformation, including two optical elements with coordinate transformation phase and correct phase, operates on the received *** horizontal position of the spot is determined by the vortex phases, and the vertical position of the spot is dependent on the radial varying phases. The simulation and experimental results show that the proposed method is feasible both for separation of two OAM modes and separation of three OAM modes. The proposed separation method is available in principle for any neighboring OAM modes because the radial varying phase is controlled. Additionally, no extra instruments are introduced, and there is no diffraction and narrowing process limitation for the separation.

关键词： OAM Efficient separating orbital angular momentum mode with radial varying phase mode

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Compact, submilliwatt, 2 × 2 silicon thermo-optic switch based on photonic crystal nanobeam cavities

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photonics Research 2017年第2期5卷 108-112页

作者： HUANYING ZHOU CIYUAN QIU XINHONG JIANG QINGMING ZHU YU HE YONG ZHANG YIKAI SU RICHARD SOREF State key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Engineering Department University of Massachusetts

We propose and experimentally demonstrate a 2×2 thermo-optic(TO) crossbar switch implemented by dual photonic crystal nanobeam(PCN)cavities within a silicon-on-insulator(SOI)*** thermally tuning the refractive index of silicon,the resonance wavelength of the PCN cavities can be *** the help of the ultrasmall mode volumes of the PCN cavities,only～0.16 mW power is needed to change the switching *** a spectral passband of 0.09 nm at the 1583.75 nm operation wavelength,the insertion loss(IL)and crosstalk(CT)performances were measured as IL(bar)=-0.2 dB,CT(bar)=-15 dB,IL(cross)=-1.5 dB,and CT(cross)=-15 ***,the thermal tuning efficiency of the fabricated device is as high as1.23 nm/mW.

关键词： PCN Compact silicon thermo-optic switch based on photonic crystal nanobeam cavities submilliwatt mode SOI

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