1 Photonics Group, University of Bristol, Bristol BS8 1UB, UK
2 State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China
3 School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK
Optical vortices (OVs) refer to a class of cylindrical optical modes with azimuthally varying phase terms arising either from polarization rotation or from the angular projection of the wave vector that at the quantum level corresponds to photon spin or orbital angular momenta. OVs have attracted the attention of researchers in many areas of optics and photonics, as their potential applications range from optical communications, optical manipulation, imaging, sensing, to quantum information. In recent years, integrated photonics has becomes an effective method of manipulating OVs. In this paper, the theoretical framework and experimental progress of integrated photonics for the manipulation of OVs were reviewed.
optical vortex optical vortex orbital angular momentum orbital angular momentum angular grating angular grating micro-ring resonator micro-ring resonator Frontiers of Optoelectronics
2016, 9(2): 194
复旦大学 通信科学与工程系 信息科学与技术学院 专用集成电路与系统国家重点实验室，上海 200433
提出一种新的具有较大带宽延时积(BDP)的光缓存结构。该结构基于一个单独的微环谐振腔和一个OFDM(正交频分复用)技术的发射机。较大的带宽延时积是通过将数据分布在OFDM的子载波上然后由谐振腔来获得的。建立了一个包括整个系统的数值模型，并且在仅考虑5条子载波的仿真中实现了较大的带宽延时积。
光子集成 微环谐振腔 慢光 photonic integration micro-ring resonator slow-light
Department of Communication Science and Engineering, State Key Laboratory of Application Specific Integrated Circuit (ASIC) and System, Fudan University, Shanghai 200433, China
Frontiers of Optoelectronics
2011, 4(3): 288
复旦大学通信科学与工程系专用集成电路与系统国家重点实验室， 上海 200433
随着波分复用(WDM)、偏振复用(PDM)和高阶调制等技术的使用，单模光纤的传输容量已经快速接近其香农极限。目前有望突破该极限的方法是空分复用(SDM)，这使得多模光纤重新受到关注。基于多模光纤的多输入多输出(MIMO)技术是解决信息爆炸式增长的新领域。研究并比较了光MIMO系统的各种实现方式，其中重点介绍了模群分集复用(MGDM)技术；同时也阐述了相干多输入多输出系统(COMIMO)相应的内容。最后指出多模光纤MIMO系统中存在的问题，以期对以后的研究有所裨益。
光通信 多模光纤 多输入多输出 波分复用 正交频分复用 模群分集复用 激光与光电子学进展
2011, 48(10): 100601
复旦大学通信科学与工程系专用集成电路与系统国家重点实验室，上海 200433
文章介绍了两种补偿相位噪声的新技术，分别是补偿激光器相位噪声的数字前馈载波恢复算法和补偿非线性相位噪声的数字反向传播算法。其中数字前馈载波恢复算法能有效地提高能够容忍的激光器线宽；数字反向传播算法减少了非线性噪声，并能够大幅提高发射功率，以提高信噪比。
相干检测 相位噪声 载波同步 前馈 反向传播 coherent detection phase noise carrier synchronization feedforward backpropagation
Author Affiliations
Abstract
1 Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2 Department of Communication Science and Engineering, and State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, China
Novel optical offset quadrature phase shift keying (OQPSK) and improved minimum-shift keying (MSK) modulation schemes to smooth optical phase hopping for high speed fiber optics transmission are proposed. Simulations have been done among the MSK, OQPSK, quadrature phase shift keying (QPSK), and binary phase-shift keying (BPSK) modulation formats at 40 Gb/s over 100-km transmission link using coherent detection. Simulation results present good performances to elevate chromatic dispersion tolerance and reduce the influence of nonlinear effects by adopting the smooth phase modulation formats. Inter-symbol interference decreases for the fast side-lobe property and tight spectrum as a result of avoding the π phase shift and reducing envelop fluctuation.
相位平滑调制 偏移四相相移键控 最小移频键控 060.2330 Fiber optics communications 060.4080 Modulation 060.5060 Phase modulation Chinese Optics Letters
2010, 8(9): 856
Author Affiliations
Abstract
We propose a novel advanced orthogonal modulation format dark return-to-zero frequency shift keying/differential phase shift keying (DRZ-FSK/DPSK) and its realization scheme. The DRZ-FSK/DPSK is generated by the combination of a 40-Gb/s return-to-zero (RZ) signal and a DRZ signal which is converted from the RZ using a semiconductor optical amplifier (SOA) based on nonlinear cross polarization rotation (XPR) and then re-modulated by high-bit-rate DPSK at 40 Gb/s. The feasibility of the scheme is experimentally demonstrated. Bit error rate (BER) results of the total 80-Gb/s DRZ-FSK/DPSK orthogonal modulation signal with a subsequent 100-km single-mode fiber (SMF) transmission link show its potential for future high-speed long-haul optical communication.
060.2330 Fiber optics communications 060.4080 Modulation Chinese Optics Letters
2010, 8(9): 852
Author Affiliations
Abstract
Department of Communication Science and Engineering, State Key Lab of ASIC and System, Fudan University, Shanghai 200433, China
A novel 40-Gb/s constant envelope optical frequency shift keying (FSK) transmitter and the transmission characteristics are investigated both by simulation and experiment. Meanwhile, to increase the spectrum efficiency of FSK, we propose a novel optical minimum-shift keying (MSK) scheme and analyze its performance compared with other MSK schemes and other traditional modulation formats. Simulation and experimental results show that the novel FSK scheme could be a potential candidate for the future high speed transmission and label switching systems. And the novel MSK scheme deserves future deep research for its potential excellent performance.
光频移键控 光最小频移键控 060.2330 Fiber optics communications 060.2360 Fiber optics links and subsystems 060.4080 Modulation Chinese Optics Letters
2010, 8(9): 837
