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Microwave Photonics
Full-band direct-conversion receiver with enhanced port isolation and I/Q phase balance using microwave photonic I/Q mixer (Invited Paper)
Download:952次
Jianqiang Li
1
Jia Xiao
1
Xiaoxiong Song
1
Yue Zheng
1
[ ... ]
Kun Xu
1,*
Author Affiliations
Abstract
1
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
2
CETC Key Laboratory of Aerospace Information Applications, Shijiazhuang 050081, China
3
The 54th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang 050081 China
A full-band direct-conversion receiver using a microwave photonic in-phase and quadrature (I/Q) mixer is proposed and experimentally evaluated in terms of radio frequency (RF) range, port isolation, phase imbalance, conversion gain, noise figure, spurious-free dynamic range, and error vector magnitude. The proposed microwave photonic I/Q mixer shows significant advantages in local oscillator leakage and I/Q phase imbalance over entire RF bands, which are recognized as major drawbacks of conventional direct-conversion receivers.
060.5625
Radio frequency photonics
070.1170
Analog optical signal processing
250.4110
Modulators
PDF全文
Full Text
Chinese Optics Letters
2017, 15(1): 010014
Microwave Photonics
Full-duplex transmission of IEEE 802.11ac-compliant MIMO WLAN signals over a 2-km 7-core fiber
Download:890次
Yuting Fan
1
Jianqiang Li
1,*
Yi Lei
1
Ming Tang
2
[ ... ]
Kun Xu
1
Author Affiliations
Abstract
1
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
2
Wuhan National lab for Optoelectronics (WNLO) & National Engineering Laboratory for Next Generation Internet Access System, School of Optical and Electronic Information, Huazhong University of Science and Technology, (HUST), Wuhan 430074, China
In this Letter, we experimentally demonstrate a full-duplex transmission system of IEEE 802.11ac-compliant multiple-input multiple-output (MIMO) signals over a 2-km 7-core fiber for in-building wireless local-area network (WLAN) distributed antenna systems. For full-duplex
3
×
3
MIMO demonstration, the crosstalk impacts of both fiber-transmission-only and optic-wireless transmission situation are evaluated. The results indicate that the impact of crosstalk on radio-over-fiber (ROF) link performance is not significant and the quality of the cascaded multi-core fiber and wireless channel is mainly determined by the wireless part. To further improve the system capacity, polarization multiplexing (PolMux) technology is employed to achieve a full-duplex
6
×
6
MIMO over a single 7-core fiber. Although employing the PolMux method will slightly decrease the EVM and condition number performance as opposed to a non-PolMux MCF system, it is still a competitive solution in large optical connection demand scenarios that require a low cost.
350.3950
Micro-optics
060.4230
Multiplexing
060.2360
Fiber optics links and subsystems
PDF全文
Full Text
Chinese Optics Letters
2017, 15(1): 010011
Fourier Optics and Signal Processing
Compact optoelectronic oscillator based on a Fabry–Perot resonant electro-optic modulator
Download:957次
Jian Dai
1,2,*
Yitang Dai
1
Feifei Yin
1
Yue Zhou
1
[ ... ]
Kun Xu
1,3
Author Affiliations
Abstract
1
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
2
State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
3
School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
A novel compact optoelectronic oscillator (OEO) employing a Fabry–Perot (FP) resonant electro-optic (EO) modulator is proposed and experimentally demonstrated. The resonant modulator is used as the optical storage element as well as the mode selection element, which can greatly reduce the system complexity and make the system more portable. Moreover, the optical resonance and electrical transmission response for the FP resonant EO modulator are theoretically and experimentally studied. The proposed OEO oscillates at 10 and 20 GHz in the proof-of-concept experiment, and the corresponding single-sideband phase noise can reach below
118
and
108
dBc
/
Hz
at 1 MHz offset frequency, respectively.
070.1170
Analog optical signal processing
070.5753
Resonators
PDF全文
Full Text
Chinese Optics Letters
2016, 14(11): 110701
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