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Optical Devices
Optical orbital angular momentum multiplexing communication via inversely-designed multiphase plane light conversion
Juncheng Fang
1†
Jinpei Li
1†
Aru Kong
1
Youpeng Xie
1
[ ... ]
Xiaocong Yuan
1,*
Author Affiliations
Abstract
1
Nanophotonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology & Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
2
e-mail: ayst3_1415926@sina.com
3
e-mail: leiting@szu.edu.cn
Multiplexing and demultiplexing of optical orbital angular momentum (OAM) are critical operations in mode-division multiplexing communications. Traditional Dammann gratings, spiral phase planes, and optical geometric transformations are regarded as convenient methods for OAM mode (de)multiplexing. However, crosstalk between the different modes and the difficulty of mode multiplexing greatly limit their application to mode-division multiplexing communications. Here, using a set of inversely-designed phase planes, we demonstrate an OAM (de)multiplexer based on multiphase plane light conversion that can enable perfect OAM multiplexing communication. The sorted patterns are Gaussian-like and can be coupled easily into single-mode fiber arrays. Inputs from the fiber array are turned into coaxial OAM modes after the phase planes. OAM mode crosstalk generated by the multiplexer is less than
-
20
dB
, with insertion loss of less than 2.6 dB. OAM modes are sorted by the demultiplexer with mode crosstalk below
-
10
dB
, and the sorting results are coupled to the fiber array. OAM modes carrying 10 Gbit/s on–off keying signals were transmitted in a 5 km few-mode fiber. The measured bit-error-rate curves have power penalties of less than 10 dB. The proposed configuration is highly efficient and convenient and will be beneficial for potential applications in quantum information, information processing, and optical communications.
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Photonics Research
2022, 10(9): 2015
Fiber Optics and Optical Communications
High-speed Stokes vector receiver enabled by a spin-dependent optical grating
Youpeng Xie
1
Ting Lei
1
Dawei Wang
2
Jianxin Ren
3
[ ... ]
Xiaocong Yuan
1,6,*
Author Affiliations
Abstract
1
Nanophotonics Research Centre, Shenzhen University, Shenzhen 518060, China
2
State Key Laboratory of Optoelectronic Material and Technologies and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510006, China
3
Institute of Optics and Electronics, Nanjing University of Information Science and Technology, Nanjing 210044, China
4
e-mail: bo@nuist.edu.cn
5
e-mail: lzhh88@mail.sysu.edu.cn
6
e-mail: xcyuan@szu.edu.cn
Stokes vector direct detection is a promising, cost-effective technology for short-distance communication applications. Here, we design and fabricate a spin-dependent liquid crystal grating to detect light polarization states. By separating the circular and linear components of incident light, the polarization states can be resolved with accuracy of up to 0.25°. We achieved Stokes vector direct detection of quadrature phase-shift keying (QPSK), 8PSK, and 16-ary quadrature amplitude modulation signals with 32, 16, and 16 GBd rates, respectively. We integrated the system, including the grating, photodetectors, and optical elements, on a miniaturized printed circuit board and demonstrated high-speed optical communications with 16 GBd rate QPSK signals.
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Photonics Research
2021, 9(8): 08001470
Polarization and Ellipsometry
Multifunctional geometric phase optical element for high-efficiency full Stokes imaging polarimetry
Download:725次
Yanmeng Dai
1†
Yuquan Zhang
1†
Youpeng Xie
1
Dapeng Wang
1
[ ... ]
Xiaocong Yuan
1,3,*
Author Affiliations
Abstract
1
Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China
2
e-mail: cjmin@szu.edu.cn
3
e-mail: xcyuan@szu.edu.cn
Polarization imaging finds applications in many areas, such as photoelasticity, ellipsometry, and biomedical imaging. A compact, snapshot, and high-efficiency imaging polarimeter is highly desirable for many applications. Here, based on a single multifunctional geometric phase optical element (GPOE), a new method is proposed for high-efficiency snapshot imaging polarimetry. With tailored spatially varying orientation of each anisotropic unit cell, the GPOE works highly efficiently as both a spin sorter and a half-wave plate, enabling snapshot retrieving of a full Stokes vector of incident light. The designed GPOE is implemented in the form of liquid crystal fabricated with a photo-alignment technology, and its application in imaging polarimetry is experimentally demonstrated by retrieving full Stokes parameters of a cylinder vector beam. This method can also work in the form of plasmonic or dielectric metasurfaces, enabling ultra-compact polarization detection systems by monolithic integration with other devices such as metalenses.
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Photonics Research
2019, 7(9): 09001066
Fiber optics and optical communications
Beam wander relieved optical switch using Bessel beams in turbulent atmosphere
Download:916次
Youpeng Xie
Ting Lei
Chuanwu Yang
Luping Du
Xiaocong Yuan
*
Author Affiliations
Abstract
Nanophotonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China
The digital micro-mirror device (DMD)-based optical switch has the advantages of high-speed channels reallocation, miniaturization, stability, and large capacity for short reach optical communication in the datacenter. However, thermal turbulent atmosphere in the datacenter would cause perturbations and channel crosstalk for the optical switch. The self-healing optical beams such as the Bessel beams have the non-diffraction property to mitigate the turbulence issue. Here, we propose and demonstrate a Bessel beams enabled DMD-based optical switch to improve the stability and performance of optical communication in turbulent atmosphere. We statistically characterize the beam wanders of the Gaussian and Bessel beams in turbulent atmosphere at temperatures of 60°C and 80°C. We build the two-channel optical switch communication system and measure the bit error rate of the 15 Gbit/s on–off keying signals transmitted by the Gaussian and Bessel beams at temperatures of 60°C and 80°C, respectively. The optical switch using the Bessel beams shows lower bit error rates with weaker fluctuations compared with the Gaussian beams. The DMD-based optical switch using the Bessel beams has the potential for practical optical communication applications in the datacenter.
060.4510
Optical communications
130.4815
Optical switching devices
280.7060
Turbulence
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Chinese Optics Letters
2019, 17(9): 090602
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