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【fiber optics links and subsystems】
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Fiber Optics and Optical Communications
Applications of weakly-coupled few-mode fibers [Invited]
Download:1104次
Huiyuan Liu
He Wen
Guifang Li
*
Author Affiliations
Abstract
CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, FL 32816, USA
Space-division multiplexing (SDM) has attracted significant attention in recent years because larger transmission capacity is enabled by more degrees of freedom (DOFs) in few-mode fibers (FMFs) compared with single-mode fibers (SMFs). To transmit independent information on spatial modes without or with minor digital signal processing (DSP), weakly-coupled FMFs are preferred in various applications. Several cases with different use of spatial DOFs in weakly-coupled FMFs are demonstrated in this work, including single-mode or mode-group-multiplexed transmission, and spatial DOFs combined with time or frequency DOF to improve the system performance.
multiplexing
nonlinear optics
fibers
radio frequency photonics
fiber optics links and subsystems
few-mode fibers
PDF全文
Full Text
Chinese Optics Letters
2020, 18(4): 040601
Fiber Optics and Optical Communications
Passive phase noise compensation for fiber-optic radio frequency transfer with a nonsynchronized source
Download:827次
Tiancheng Lin
1
Guiling Wu
1,2,*
Hongwei Li
1
Guoyong Wang
3
Jianping Chen
1,2
Author Affiliations
Abstract
1
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
Shanghai Key Laboratory of Navigation and Location-Based Services, Shanghai 200240, China
3
China Academy of Space Technology (Xi’an), Xi’an 710000, China
We propose a passive compensation fiber-optic radio frequency (RF) transfer scheme with a nonsynchronized RF stable source during a round-trip time, which can avoid high-precision phase-locking and efficiently suppress the effect of backscattering only using two wavelengths at the same time. A stable frequency signal is directly reproduced by frequency mixing at the remote site. The proposed scheme is validated by the experiment over a 40 km single mode fiber spool using nonsynchronized common commercial RF sources. The influence of the stability of nonsynchronized RF sources on the frequency transfer is investigated over different length fiber links.
060.2360
Fiber optics links and subsystems
120.3930
Metrological instrumentation
PDF全文
Full Text
Chinese Optics Letters
2018, 16(10): 100602
Microwave Photonics
Photonics-assisted compressive sampling system for wideband spectrum sensing (Invited Paper)
Download:990次
Qiang Guo
Minghua Chen
*
Yunhua Liang
Hongwei Chen
[ ... ]
Shihong Xie
Author Affiliations
Abstract
Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
Compressive sampling (CS) has attracted considerable attention in microwave and radio frequency (RF) fields in recent years. It enables the acquisition of high-frequency signals at a rate much smaller than their Nyquist rates. Combined with photonics technology, traditional CS systems can significantly enlarge their operating bandwidth, which offers great potential for spectrum sensing in cognitive radios. In this Letter, we review our recent work on photonic CS systems for wideband spectrum sensing. First, a proof-of-concept photonics-assisted CS system is demonstrated; it is capable of acquiring numerous radar pulses in an instantaneous bandwidth spanning from 500 MHz to 5 GHz with a 500-MHz analog-to-digital converter (ADC). To further reduce the acquisition bandwidth, multi-channel photonics-assisted CS systems are proposed for the first time, enabling the acquisition of multi-tone signals with frequencies up to 5 GHz by using 120-MHz ADCs. In addition, the system bandwidth is increased from 5 to 20 GHz by employing time-interleaved optical sampling.
060.2360
Fiber optics links and subsystems
230.0250
Optoelectronics
060.5625
Radio frequency photonics
PDF全文
Full Text
Chinese Optics Letters
2017, 15(1): 010012
Microwave Photonics
Full-duplex transmission of IEEE 802.11ac-compliant MIMO WLAN signals over a 2-km 7-core fiber
Download:893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
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Full Text
Chinese Optics Letters
2017, 15(1): 010011
Microwave Photonics
Frequency synthesis of forced opto-electronic oscillators at the X-band
Download:862次
T. Sun
1
Li. Zhang
2
A. K. Poddar
2
U. L. Rohde
2
A. S. Daryoush
1,*
Author Affiliations
Abstract
1
Department of ECE, Drexel University, Philadelphia, PA 19104 USA
2
Synergy Microwave Corp., Paterson, NJ 07504 USA
Ultra-low phase noise performance is required for frequency agile local oscillators, which are the core for high resolution imagers, spectrum analyzers, and high speed data communications. A forced opto-electronic oscillator (OEO) benefits from frequency stabilization techniques for realizing a clean and low phase noise source at microwave and millimeter wave frequencies. Forced oscillation techniques of self-injection locking and self-phase lock loop are combined to provide an ultra-low oscillator phase noise both close-in and far-away from the carrier frequency, while a tunable yttrium iron garnet microwave filter combined with a wavelength tuned transversal filter are employed to implement both coarse and fine frequency tuning for a tunable X-band OEO. A phase noise of
137
dBc
/
Hz
at an offset frequency of 10 kHz is achieved covering the frequencies of 9 to 11 GHz with a fine frequency tuning resolution of 44 Hz/pm and coarse tuning of 25 MHz/mA. Moreover, the long term stability of the output signal is tested, and a maximum frequency drift of 2 kHz is measured within 60 min for the X-band synthesizer.
060.2360
Fiber optics links and subsystems
230.4910
Oscillators
060.5625
Radio frequency photonics
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Full Text
Chinese Optics Letters
2017, 15(1): 010009
Fiber Optics and Optical Communications
Dispersion compensation using high-positive dispersive optical fibers
Download:694次
Mohammad Hadi
*
Farokh Marvasti
Mohammad Reza Pakravan
Author Affiliations
Abstract
Electrical Engineering Department, Sharif University of Technology, Tehran 113658639, Iran
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.
060.2360
Fiber optics links and subsystems
070.0070
Fourier optics and signal processing
070.1170
Analog optical signal processing
060.0060
Fiber optics and optical communications
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Full Text
Chinese Optics Letters
2017, 15(3): 030601
Fiber Optics and Optical Communications
Highly linear W-band receiver front-end based on higher-order optical sideband processing
Download:721次
Haojie Wang
Shangyuan Li
Xiaoping Zheng
*
Xiaoxiao Xue
[ ... ]
Bingkun Zhou
Author Affiliations
Abstract
Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
A highly linear W-band receiver front-end based on higher-order optical sideband (OSB) processing is proposed and experimentally demonstrated. Two-tone analysis shows that by manipulating higher-order OSBs, the third-order intermodulation distortion (IMD3) introduced by optoelectronic components (mainly modulators) in the receiver front-end can be further suppressed, and a 9 dB improvement of the ratio of the fundamental and IMD3 can be attained. In the experiment, the spurious-free dynamic range of the W-band receiver front-end is up to
122.1
dB
·
Hz
2
/
3
, with improvement by 9 dB compared with that of only processing the five OSBs.
060.2360
Fiber optics links and subsystems
060.5625
Radio frequency photonics
130.4310
Nonlinear
PDF全文
Full Text
Chinese Optics Letters
2017, 15(5): 050603
Fiber Optics and Optical Communications
Flexible multidimensional modulation formats based on PM-QPSK constellations for elastic optical networks
Download:855次
Zilong He
1,*
Wentao Liu
1
Bailin Shen
2
Xue Chen
1
[ ... ]
Yingfeng Liu
2
Author Affiliations
Abstract
1
State Key Lab of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
2
ZTE Corporation, Beijing 100191, China
We demonstrate flexible multidimensional modulation formats, polarization multiplexed
k
-symbol check quadrature phase shift keying (PM-kSC-QPSK), based on PM-QPSK constellations for elastic optical networks. The experimental results show a significant optical signal noise ratio (OSNR) tolerance improvement for PM-2SC-QPSK and PM-4SC-QPSK over PM-QPSK in both back-to-back and 500 km transmission scenarios at the expense of spectral efficiency reduction. This flexible modulation method can be used in elastic optical networks to provide a trade-off between the spectral efficiency and OSNR tolerance.
060.1660
Coherent communications
060.2360
Fiber optics links and subsystems
060.4080
Modulation
PDF全文
Full Text
Chinese Optics Letters
2016, 14(4): 040602
Fiber Optics and Optical Communications
Simultaneous frequency transfer and time synchronization over a 430 km fiber backbone network using a cascaded system
Qin Liu
1
Shenglong Han
2
Jialiang Wang
1
Zitong Feng
3
[ ... ]
Shensheng Han
1
Author Affiliations
Abstract
1
Key Laboratory for Quantum Optics, CAS, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
3
Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
4
e-mail: hwcai@siom.ac.cn
Based on dense wavelength-division multiplexing technology, frequency transfer and time synchronization are simultaneously realized over a compensated cascaded fiber link of 430 km, which is a part of the Beijing–Shanghai optical fiber backbone network. The entire cascaded system consists of two stages with fiber links of 280 and 150 km, respectively. To keep high symmetry and low noise, specific bi-directional erbium-doped fiber amplifiers are used to compensate the large optical attenuation of each fiber link. When the compensation servo is active in every stage, the cascaded system achieves the stability of
1.94
×
10
13
at 1 s and
1.34
×
10
16
at
10
4
s
, for frequency transfer. It is also verified that the actual results of the cascaded system are in good agreement with the theoretical ones calculated from error theory. Simultaneously, after calibration of each stage, time synchronization is also realized. The final accuracy of the whole system is within 94 ps.
060.2360
Fiber optics links and subsystems
060.2340
Fiber optics components
120.7000
Transmission
PDF全文
Full Text
Chinese Optics Letters
2016, 14(7): 070602
Instrumentation, Measurement and Metrology
Fiber-based radio frequency dissemination for branching networks with passive phase-noise cancelation
Download:916次
Yu Bai
1,3
Bo Wang
1,2,*
Chao Gao
1,2
Jing Miao
1,3
[ ... ]
Lijun Wang
1,2,3,4,**
Author Affiliations
Abstract
1
Joint Institute for Measurement Science, Beijing 100084, China
2
The State Key Lab of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
3
Department of Physics, Tsinghua University, Beijing 100084, China
4
National Institute of Metrology, Beijing 100013, China
We demonstrate a new fiber-based radio frequency (RF) dissemination scheme suitable for a star-shaped branching network. Without any phase controls on the RF signals or the use of active feedback-locking components, the highly stable reference frequency signal can be delivered to several remote sites simultaneously and independently. The relative frequency stabilities of
6
×
10
15
/
s
and
7
×
10
17
/
10
4
s
are obtained for a 10 km dissemination. This low cost and scalable method can be applied to a large-scale frequency synchronization network.
120.3930
Metrological instrumentation
120.3940
Metrology
060.2360
Fiber optics links and subsystems
PDF全文
Full Text
Chinese Optics Letters
2015, 13(6): 061201
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