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    Atmospheric optics and oceanic optics

Jianjun Yin   Hongzhan Liu   Rong Huang   Zhengguang Gao   and Zhongchao Wei  

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We present an automatic repeat request (ARQ) free space optical (FSO) system, which consists of a pulse position modulation (PPM) hard decision and an ARQ. The new ARQ’s data error detection is based on a PPM hard decision’s results and can eliminate the traditional ARQ information redundancy. The results of the numerical simulation have a good agreement with theoretical analysis and show that the ARQ-FSO system can effectively improve the bit error rate (BER) performance of the direct hard decision PPM system. Additionally, the proposed system significantly improves the average throughput efficiency compared to traditional ARQ systems. These characteristics make the ARQ-FSO system suitable for application in low BER and complexity FSO scenarios.

       PDF全文 (下载：184)        Chinese Optics Letters ，2017年第15卷第6期 pp.060101      

    Atomic and molecular physics

Kai Wang   Wei Zhang   Zhiyuan Zhou   Mingxing Dong   Shuai Shi   Shilong Liu   Dongsheng Ding   and Baosen Shi  

      摘要 + ：(浏览：223次) | 请注意：下载全文可能需要登录或支付相关费用

In this Letter, we report on the successful optical storage of orbital angular momentum (OAM) using Rydberg electromagnetically induced transparency (EIT) in cold rubidium atoms. With a storage time of 1.4 μs, the retrieved structure is highly similar, showing the ability of storing light’s OAM at a principal quantum number of 20. The results at higher principal quantum numbers (n=25,30) are also measured. These results show the promise of image processing based on a Rydberg atomic system.

       PDF全文 (下载：98)        Chinese Optics Letters ，2017年第15卷第6期 pp.060201      

Shaobing Zhu   Jun Qian   Yuzhu Wang  

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We investigate the spin dynamics, starting from the initial band-insulating state, of fermionic high-spin atoms in optical superlattices. Through numerical simulations and analytical calculations, we determine the time evolution behavior of the system. When the spin-changing strength and tunneling strength are comparable, the spin dynamics feature a spin-changing oscillation with the amplitude modulated by the superexchange interaction. When the double-well potential is very shallow, the spin dynamics feature a simple harmonic oscillation with the oscillation frequencies related only to the spin-changing strength, which can be properly explained with the perturbation model.<录用日期>2017-3-3<上网时间>2017-3-22

       PDF全文 (下载：93)        Chinese Optics Letters ，2017年第15卷第6期 pp.060202      

    Diffraction and gratings

Jianbin Zhang   Zihao Pang   Liyan Feng   Tianfen Zhong   Linyi Wang   and Dongmei Deng  

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We present an investigation on the propagation properties of the chirped Airy vortex (CAiV) beams through slabs of left-handed materials (LHMs) and right-handed materials (RHMs). We discuss the influence of chirped parameter C on the propagation of the CAiV beams through LHM and RHM slabs. Our simulation results show that a maximum accelerated velocity appears during the propagation process. The intensity concentration of the CAiV beams increases with the absolute value of the chirped parameter. The peak intensity of the CAiV beams changes abruptly, and the chirped parameter plays an active role on the difference of the maximum and the minimum. In the energy flow, we find that the effects of the chirped parameter on the strength of the vortex are different at different propagation distances.

       PDF全文 (下载：150)        Chinese Optics Letters ，2017年第15卷第6期 pp.060501      

    Fiber optics and optical communication

Min Liu   Bingyue Zhao   Xu Yang   Jingyun Hou  

      摘要 + ：(浏览：260次) | 请注意：下载全文可能需要登录或支付相关费用

Through doping liquid crystals into the core region, we propose a kind of seven-core photonic crystal fiber (PCF) which can achieve mode shaping and temperature sensing simultaneously in the communication window of 1.1–1.7 μm. To the best of our knowledge, this is the first time that the function of seven-core PCFs as temperature sensors is investigated. By using the full vectorial finite element method, the characteristics of the fiber with the temperature, such as the effective mode area, the waveguide dispersion, and the confinement loss, are analyzed. This kind of PCF can be competitive in providing temperature sensing in multi-core PCF lasers.<录用日期>2017-03-09<上网时间>2017-03-23

       PDF全文 (下载：66)        Chinese Optics Letters ，2017年第15卷第6期 pp.060601      

Linghao Cheng   Yunbo Li   Yizhi Liang   Hao Liang   Bai-Ou Guan  

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Birefringence is critical in dual-polarization fiber-laser-based fiber-optic sensing systems, as it directly determines the beat frequency between the two polarizations. A study of pump induced birefringence in dual-polarization fiber lasers is presented here, which shows that the pump induced birefringence is a result of the interplay among pump induced refractive index change, laser dynamics, and anisotropy inside fiber lasers. For erbium-doped fiber lasers, pumping at 1480 nm is better than pumping at 980 nm in lower pump induced birefringence. Moreover, injection at 532 nm for an adequately long enough time can permanently reduce anisotropy and, hence, reduce pump induced birefringence.<录用日期>2017-03-03<上网时间>2017-03-29

       PDF全文 (下载：77)        Chinese Optics Letters ，2017年第15卷第6期 pp.060602      

Jian Chen   Ling Fang   Qianwu Zhang   Junjie Zhang   Yingxiong Song   Yingchun Li   Min Wang  

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Record-high 60 Gb/s optical orthogonal frequency division multiplexing (OFDM) transmissions over intensity modulation and direct-detection (IMDD)-based 100 m optical mode (OM1) multi-mode fiber (MMF) links are experimentally demonstrated, utilizing 10 GHz electro-absorption modulated laser intensity modulators at a single 1550 nm wavelength. Adaptive bit loading and a simple central launching scheme of the proposed scheme show an effective way for combating the channel fading and simplifying the system structure. It shows good potential in short reach data center interconnections.<录用日期>2017-03-09<上网时间>2017-04-10

       PDF全文 (下载：68)        Chinese Optics Letters ，2017年第15卷第6期 pp.060603      

Jing Xu   Yang Qiu   Ning Deng  

      摘要 + ：(浏览：336次) | 请注意：下载全文可能需要登录或支付相关费用

We investigate the principles of optical phase remodulation and demonstrate its application in a future-proof 10 Gb/s/channel wavelength-division-multiplexed (WDM) passive optical network to realize a colorless optical network unit and bidirectional transmission over a single fiber. The modulation depth of downstream differential phase-shift keying is properly reduced to facilitate phase remodulation and Rayleigh noise mitigation. For both downstream and upstream 10 Gb/s signals, error-free transmission via a 20 km single-mode fiber is demonstrated without dispersion compensation operation.<录用日期>2017-03-24<上网时间>2017-04-19

       PDF全文 (下载：108)        Chinese Optics Letters ，2017年第15卷第6期 pp.060604      

Hongyao Chen   Tigang Ning   Jing Li   Li Pei   Jin Yuan   Xiaodong Wen  

      摘要 + ：(浏览：193次) | 请注意：下载全文可能需要登录或支付相关费用

This Letter demonstrates a filterless v-band signals and pulses generator scheme with a tunable optical carrier to sideband ratio (OCSR). Through complete theoretical analysis, the mathematical expression of the OCSR that contains the extinction ratio, phase modulation index, and bias angle is obtained. It is found that the OCSR has a wide tuning range, from 50 to ?70 dB. By careful adjustment, a 60 GHz millimeter-wave signal with the OCSR at 50.72 dB and the electrical spurious suppression ratio at 36.6 dB can be achieved. Moreover, the discussions of using optimum OCSR to generate a Nyquist pulse or triangular-shaped pulse are also presented in this Letter.<录用日期>2017-03-24<上网时间>2017-05-02

       PDF全文 (下载：57)        Chinese Optics Letters ，2017年第15卷第6期 pp.060605      

    Holography

Masato Fujiwara   Naoki Takada   Hiromitsu Araki   Chun Wei Ooi   Shohei Ikawa   Yuki Maeda   Hiroaki Niwase   Takashi Kakue   Tomoyoshi Shimobaba   and Tomoyoshi Ito  

      摘要 + ：(浏览：218次) | 请注意：下载全文可能需要登录或支付相关费用

We propose a simple gradation representation method using a binary-weighted computer-generated hologram (CGH) to be displayed on a high-speed spatial light modulator that can be controlled by the pulse-width modulation technique. The proposed method uses multiple bit planes comprising binary-weighted CGHs with various pulse widths. The object points of a three-dimensional (3D) object are assigned to multiple bit planes according to their gray levels. The bit planes are sequentially displayed in a time-division-multiplexed manner. Consequently, the proposed method realizes a gradation representation of a reconstructed 3D object.

       PDF全文 (下载：106)        Chinese Optics Letters ，2017年第15卷第6期 pp.060901      

    Lasers and laser optics

Zutao Fan   Zebiao Gan   Xiaoyan Liang   Lianghong Yu   Wenqi Li   Zhen Guo   Xiaolong Yuan   He Cao   Pei Huang   Ruxin Li   and Zhizhan Xu  

      摘要 + ：(浏览：183次) | 请注意：下载全文可能需要登录或支付相关费用

We research some properties of parasitic lasing (PL) in the Ti:sapphire chirped pulse amplifier with the crystal diameter of 100 mm. The evolutionary process from the spontaneous emission to the PL and its influence on amplified output energy, spectrum, and beam profile are experimentally measured. The threshold of PL in the crystal is 22 J, and the output signal can still keep rising with the pump when the pump energy is below 38 J. The PL has no obvious impact on the output spectrum and beam profile besides the energy.

       PDF全文 (下载：69)        Chinese Optics Letters ，2017年第15卷第6期 pp.061401      

Yaxun Zhang   Tong Wang   Zhihai Liu   Yu Zhang   Xiaoyun Tang   Enming Zhao   Xinghua Yang   Haili Jiang   Jianzhong Zhang   Jun Yang   Libo Yuan  

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We propose and demonstrate a novel single fiber optical tweezer based on a graded-index multimode fiber (GIMMF), which works with a free length GIMMF (>30 cm). We achieve a three-dimensional stable trap of yeast cells by using the GIMMF optical tweezers. Compared with the single-mode fiber optical tweezers, the GIMMF optical tweezers possess large optical trapping forces. Owing to the freedom of the GIMMF length, the fabrication of the GIMMF optical tweezers is simple, repeatable, and highly efficient. The GIMMF tweezers have the penitential to become a new member of the single fiber optical tweezers family and have a wide range of applications in the medical and biological cytology fields.<录用日期>2017-02-24<上网时间>2017-03-21

       PDF全文 (下载：73)        Chinese Optics Letters ，2017年第15卷第6期 pp.061402      

    Materials

Jing Ma   Canhua Xu   Yangguang Yao  

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The polarization state of transmitted light is linked to liquid crystal (LC) molecular distribution. The dynamic behavior of a twisted nematic LC molecule is measured with a home-built 10 kHz snapshot polarimeter. Only the transient molecule rotations are observed when the external voltage changes, and the molecules return to their original orientations quickly even when high voltage is applied. Our observations cannot be attributed to the traditional electro-optic effect. The invalidation of the static external field indicates the shielding effect of redistributing impurity ions in an LC cell.<录用日期>2017-03-24<上网时间>2017-04-10

       PDF全文 (下载：48)        Chinese Optics Letters ，2017年第15卷第6期 pp.061601      

    Nonlinear optics

Xiaoyang Huang   Shuwei Dai   Pengfei Xu   Yongmei Wang   Qing Yang   Yong Zhang   and Min Xiao  

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We experimentally investigate the resonant and nonresonant second-harmonic generation in a single cadmium sulfide (CdS) nanowire. The second-order susceptibility tensor is determined by analyzing the forward second-harmonic signals of the CdS nanowire. Our results show that (1) d33/d31=?2.5 at a nonresonant input wavelength of 1050 nm; (2) d33/d31=?1.9 at a resonant wavelength of 740 nm. The difference can be attributed to the polarization-dependent resonance.

       PDF全文 (下载：79)        Chinese Optics Letters ，2017年第15卷第6期 pp.061901      

Na Chen   Yaoxiang Liu   Tiejun Wang   Zhongbin Zhu   Haiyi Sun   Xiaona Yan   Yunhua Xia   Jinhua Xia   Juan Du   Jiansheng Liu   Yuxin Leng  

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We observe the third-harmonic generation and second-harmonic generation together with element fluorescence from the interaction of a femtosecond laser filament with a rough surface sample (sandy soil) in non-phase-matched directions. The harmonics prove to originate from the phase-matched surface harmonics and air filament, then scatter in non-phase-matched directions due to the rough surface. These harmonics occurr when the sample is in the region before and after the laser filament, where the laser intensity is not high enough to excite the element fluorescence. The observed harmonics are related to the element spectroscopy, which will benefit the understanding of the interaction of the laser filament with a solid and be helpful for the application on filament induced breakdown spectroscopy.<录用日期>2017-3-3<上网时间>2017-3-22

       PDF全文 (下载：74)        Chinese Optics Letters ，2017年第15卷第6期 pp.061902      

    Optical design and fabrication

Yonghui Zhang   Zihui Zhang   Chong Geng   Shu Xu   Tongbo Wei   and Wen'gang Bi  

      摘要 + ：(浏览：183次) | 请注意：下载全文可能需要登录或支付相关费用

A versatile nanosphere composite lithography (NSCL) combining both the advantages of multiple-exposure nanosphere lens lithography (MENSLL) and nanosphere template lithography (NSTL) is demonstrated. By well controlling the development, washing and the drying processes, the nanosphere monolayer can be well retained on the substrate after developing and washing. Thus the NSTL can be performed based on MENSLL to fabricate nanoring, nanocrescent and hierarchical multiple structures. The pattern size and the shape can be systemically tuned by shrinking nanospheres by using dry etching and adjusting the tilted angle. It is a natural nanopattern alignment process and possesses a great potential in the scope of nano-science due to its low cost, simplicity, and versatility for variuos nano-fabrications.

       PDF全文 (下载：73)        Chinese Optics Letters ，2017年第15卷第6期 pp.062201      

Tong Yang   Guofan Jin   Jun Zhu  

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In this Letter, we present a novel design method of image-side telecentric freeform imaging systems. The freeform surfaces in the system can be generated using a point-by-point design approach starting from an initial system consisting of simple planes. The proposed method considers both the desired object–image relationships and the telecentricity at the image-side during the design process. The system generated by this method can be taken as a good starting point for further optimization. To demonstrate the benefit and feasibility of our method, we design two freeform off-axis three-mirror image-side telecentric imaging systems in the visible band. The systems operate at F/1.9 with a 30 mm entrance pupil diameter and 5° diagonal field-of-view. The modulation-transfer-function curves are above 0.69 at 100 lps/mm.<录用日期>2017-03-03<上网时间>2017-03-21

       PDF全文 (下载：85)        Chinese Optics Letters ，2017年第15卷第6期 pp.062202      

    Optical devices

Yong Wang   Dengguo Zhang   Shixiang Xu   Biaogang Xu   Zheng Dong   Tan Huang  

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A cross-shaped photonic crystal waveguide formed by a square lattice Al2O3 rods array is numerically and experimentally investigated. The band gap of the TE mode for the photonic crystals and transmission characteristics of waveguides are calculated by the plane wave expansion method and the finite element method. We perform the experiments in the microwave regime to validate the numerical results. The measured reflection and transmission characteristics of the photonic crystals show a large band gap between 8.62 and 11.554 GHz (relative bandwidth is 29.34%). The electromagnetic waves are transmitted stably in the waveguides, and the transmission characteristics maintain a high level in the band gap.<录用日期>2017-03-24<上网时间>2017-04-13

       PDF全文 (下载：112)        Chinese Optics Letters ，2017年第15卷第6期 pp.062301      

    Optics at surfaces

Qi Wang   Li Zhang   Xin Wang   Haiyan Quan   Zhanguo Chen   Jihong Zhao   Xiuhuan Liu   Lixin Hou   Yanjun Gao   Gang Jia   and Shaowu Chen  

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The depth profile of electric-field-induced (EFI) optical rectification (OR) and EFI Pockels effect (PE) in a Si(110) crystal are investigated. The results show that EFI OR and PE signals are very sensitive to the electric field strength in the surface layers of the Si crystal. Theoretical formulas that include the electric field parameters and the widths of the space-charge region are presented and agreed very well with the experimental results. The experiments and simulations indicate that EFI OR and PE are potential methods for researching the surface/interface properties along the depth direction in centrosymmetric crystals such as Si.

       PDF全文 (下载：77)        Chinese Optics Letters ，2017年第15卷第6期 pp.062401      

    Optoelectronics

Mohammad Hosseini   Hassan Kaatuzian   Iman Taghavi  

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A new configuration of the confinement structure is utilized to improve optoelectronic performance, including threshold current, ac current gain, optical bandwidth, and optical output power of a single quantum well transistor laser. Considering the drift component in addition to the diffusion term in electron current density, a new continuity equation is developed to analyze the proposed structures. Physical parameters, including electron mobility, recombination lifetime, optical confinement factor, electron capture time, and photon lifetime, are calculated for new structures. Based on solving the continuity equation in separate confinement heterostructures, the threshold current reduces 67%, the optical output power increases 37%, and the ?3 dB optical bandwidth increases to 21 GHz (compared to 19.5 GHz in the original structure) when the graded index layers of AlξGa1?ξAs (ξ:0.05→0 in the left side of quantum well, ξ:0→0.02 in the right side of quantum well) are used instead of uniform GaAs in the base region.<录用日期>2017-02-24<上网时间>2017-03-21

       PDF全文 (下载：77)        Chinese Optics Letters ，2017年第15卷第6期 pp.062501      

    Other areas of optics

Ningning Zhang   Yi Zhang   Jun Bao   Feng Zhang   Sen Yan   Song Sun   and Chen Gao  

      摘要 + ：(浏览：313次) | 请注意：下载全文可能需要登录或支付相关费用

Polymethyl methacrylate (PMMA) plate luminescent solar concentrators with a bottom-mounted (BM-LSCs) photovoltaic (PV) cell are fabricated by using a mixture of Lumogen Red 305 and Yellow 083 fluorescent dyes and a commercial monocrystalline silicon cell. The fabricated LSC with dye concentrations of 40 ppm has the highest power gain of 1.50, which is the highest value reported for the dye-doped PMMA plate LSCs. The power gain of the LSC comes from three parts: the waveguide light, the transmitted light, and the reflected light from a white reflector, and their contributions are analyzed quantitatively. The results suggest that the BM-LSCs have great potential for future low-cost PV devices in building integrated PV applications.

       PDF全文 (下载：90)        Chinese Optics Letters ，2017年第15卷第6期 pp.063501