Contents
2017
Volume: 15 Issue 3
24 Article(s)

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COMPLEX OPTICAL FIELDS
Editorial for special issue on complex optical fields
Qiwen Zhan, and Andrew Forbes
Recently there is an increasing interest in tailored optical fields with complex amplitude, phase and polarization spatial distributions, as well as specifically designed temporal waveforms. Scalar optical vortices carrying orbital angular momentum and vectorial vortices such as radially and azimuthally polarized beams are among the most intensively studied examples. Comprehensive summaries of earlier developments can be found in several recent articles and edited books, e.g., by Zhan (Adv. Opt. Photon.1, 1, 20091943-8206), Padgett (Adv. Opt. Photon.3, 161, 20111943-8206 ), Forbes (Adv. Opt. Photon.8, 200, 20161943-8206), Zhan (Vectorial Optical Fields, World Scientific Publishing, 2013), and Forbes (Laser Beam Propagation, CRC Press, 2014), while applications of these complex optical fields in promising areas continue to emerge. To capture the latest developments in this important emerging field of optics, it is our pleasure to introduce the Chinese Optics Letters Special Issue on the Complex Optical Fields with contributions from scientists around the world who are active in this field.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030001 (2017)
Linear and angular momenta in tightly focused vortex segmented beams of light (Invited Paper)
Martin Neugebauer, Andrea Aiello, and Peter Banzer
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030003 (2017)
Refractive index measurement of dielectric samples using highly focused radially polarized light (Invited Paper)
Guadalupe López-Morales, Victor-Manuel Rico-Botero, Rafael Espinosa-Luna, and Qiwen Zhan
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030004 (2017)
Flexible generation of femtosecond cylindrical vector beams (Invited Paper)
Yuquan Zhang, Xiujie Dou, Yong Yang, Chen Xie, Jing Bu, Changjun Min, and Xiaocong Yuan
Femtosecond (fs) cylindrical vector beams (CVBs) have found use in many applications in recent years. However, the existing rigid generation methods seriously limit its development. Here, we propose a flexible method for generating fs-CVBs with arbitrary polarization order by employing half wave plates and vortex retarders. The polarization state, autocorrelation width, pulse width, and spectrum features of the input and generated CVB pulses are measured and compared. The results verify that the generated CVBs remain in the fs regime with no appreciable temporal distortion, and the energy conversion efficiency can reach as high as 96.5%, even for a third-order beam. As a flexible way to generate fs-CVBs, this method will have great significance for many applications.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030007 (2017)
Highly adjustable helical beam: design and propagation characteristics (Invited Paper)
Yuanhui Wen, Yujie Chen, Yanfeng Zhang, and Siyuan Yu
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030011 (2017)
Remotely sensing an object’s rotational orientation using the orbital angular momentum of light (Invited Paper)
Giovanni Milione, Ting Wang, Jing Han, and Lianfa Bai
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030012 (2017)
Research Articles
Diffraction and Gratings
Deformation of orbital angular momentum modes in bending ring-core fiber
Haozhe Yan, Shangyuan Li, Zhengyang Xie, Xiaoping Zheng, Cheng Du, Hanyi Zhang, and Bingkun Zhou
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030501 (2017)
Investigation of Fano resonance in compound resonant waveguide gratings for optical sensing
Jinhua Hu, Xiuhong Liu, Jijun Zhao, and Jun Zou
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030502 (2017)
Fiber Optics and Optical Communications
Dispersion compensation using high-positive dispersive optical fibers
Mohammad Hadi, Farokh Marvasti, and Mohammad Reza Pakravan
The common and traditional method for optical dispersion compensation is concatenating the transmitting optical fiber by a compensating optical fiber having a high-negative dispersion coefficient. In this Letter, we take the opposite direction and show how an optical fiber with a high-positive dispersion coefficient is used for dispersion compensation. Our optical dispersion compensating structure is the optical implementation of an iterative algorithm in signal processing. The proposed dispersion compensating system is constructed by cascading a number of compensating sub-systems, and its compensation capability is improved by increasing the number of embedded sub-systems. We also show that the compensation capability is a trade-off between the transmission length and bandwidth. We use the simulation results to validate the performance of the introduced dispersion compensating module. Photonic crystal fibers with high-positive dispersion coefficients can be used for constructing the proposed optical dispersion compensating module.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030601 (2017)
Carrier-less amplitude and phase modulated visible light communication system based on a constellation-shaping scheme
Zhixin Wang, Mengjie Zhang, Siyuan Chen, and Nan Chi
In this Letter, we propose a novel constellation-shaping carrier-less amplitude and phase (CAP) modulation scheme to alleviate the systematic nonlinearity in visible light communication (VLC) systems. A simple geometric transformation shaping method is employed to convert the normal square lattice constellation into multiple circular constellations. The feasibility and performance are investigated and experimentally demonstrated by a 1.25 Gb/s CAP-modulated VLC system. The results indicate that the circular constellation has better resistance to systematic nonlinearity compared with a rectangular constellation. The dynamic range of input signal peak-to-peak values promotes 20% at a low bias voltage nonlinear area and 50% at a high bias voltage nonlinear area. To the best of our knowledge, this is the first time constellation-shaping CAP has ever been reported in indoor high data rate VLC systems.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030602 (2017)
Influence of the nonlinear propagation effect on the optical signal-to-noise ratio of 400G optical fiber communication systems
Huaqiang Qin, and Xiaosheng Xiao
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 030604 (2017)
Instrumentation, measurement, and metrology
Fault monitoring in passive optical network using code division multiplex-based dual-OTDR traces comparison
Yuxing Yuan, Wei Li, Jilong Han, Qiguang Feng, Haitao Yao, Qiang Zheng, Qianggao Hu, and Shaohua Yu
A dual optical time domain reflectometry (OTDR) system, which employs two different continuous waves at the optical line terminal and a pair of fiber Bragg gratings at the end of each optical network unit, is proposed in a time-division multiplexing passive optical network (PON). The proposed scheme accomplishes the fiber fault monitoring by comparing the different wavelength’s testing curves. Complete complementary code is utilized to measure multiple wavelength signals simultaneously with only one receiver and to improve the dynamic range of this system. The PON system consisting of 20 km feeding fiber and a 1:16 splitter is investigated by the experiments. The experimental results show that the faulty branch can be successfully identified by using our scheme. What is more, we also demonstrate that our scheme can be applied to the multi-stage PON.
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 031201 (2017)
Lasers and Laser Optics
Frequency-stabilized laser system at 1572  nm for space-borne CO2 detection LIDAR
Juan Du, Yanguang Sun, Dijun Chen, Yongji Mu, Minjie Huang, Zhongguo Yang, Jiqiao Liu, Decang Bi, Xia Hou, and Weibiao Chen
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 031401 (2017)
Optical devices
Multimode-interference-based crossing for metal-insulator-metal waveguides
Weijie Mai, Luna Cui, and Li Yu
Chinese Optics Letters
  • Publication Date: Mar. 10, 2017
  • Vol. 15, Issue 3, 032301 (2017)
X-ray Optics