- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Photonic Mixer Incorporating All-Optical Microwave Frequency Generator Based on Stimulated Brillouin Scattering Using Single Laser Source
摘要： In this paper, we report the theoretical and experimental implementation of a photonic mixer for Radio-Over-Fiber (RoF) transmission systems, which incorporates an all-optical 10.87 GHz microwave frequency signal generator based on beating laser frequency with its ?rst order Stimulated Brillouin Scattering (SBS) frequency shift. A 13GHz Radio Frequency (RF) is down-converted to 2.13 GHz Intermediate Frequency (IF) signal. The proposed system con?guration represents a cost-effective photonic mixer that can be deployed for up and down conversion around 11 GHz in RoF transmission systems. The optically generated microwave signal of 10.87 GHz has a phase noise of ?109 dBc/Hz at 15-MHz offset. The proposed photonic mixer exhibits a Spurious-Free Dynamic Range (SFDR) of 93dB.Hz 2/3. This RoF transmission system con?guration deploys dual parallel Gallium Arsenide (GaAs) Mach Zehnder Modulator as a photonic mixer, and a single laser source as a Brillouin pump and as an optical carrier at the same time. To the best of our knowledge, this type of photonic mixers has not been reported in the literature.
关键词： Brillouin selective sideband ampli?cation (BSSA),Radio-over-?ber (RoF),dual parallel Mach Zehnder Modulator (DPMZM),stimulated Brillouin scattering (SBS),carrier suppressed single side band (CS-SSB)
更新于2025-09-16 10:30:52
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Optical Fiber Communications (Principles and Applications) || Radio over Fiber
摘要： Radio over Fiber (RoF) technology can integrate advantages of both wireless networks and optical fiber networks. Recently RoF technology has found numerous applications in broadband wireless access communication networks, radio astronomy, RADAR and millimeter-wave communications, antenna array beam-forming, establishment of up- and down-converting links using photonic signals, spectroscopy, imaging, and electronic warfare.
关键词： wireless networks,RoF,radio astronomy,optical fiber networks,millimeter-wave communications,antenna array beam-forming,photonic signals,broadband wireless access,electronic warfare,Radio over Fiber,spectroscopy,RADAR,imaging
更新于2025-09-12 10:27:22
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[IEEE 2019 11th International Conference on Knowledge and Systems Engineering (KSE) - Da Nang, Vietnam (2019.10.24-2019.10.26)] 2019 11th International Conference on Knowledge and Systems Engineering (KSE) - A Fast Denoising Algorithm for X-Ray Images with Variance Stabilizing Transform
摘要： We propose a fast denoising algorithm for X-Ray images with variance stabilizing transformations. The variance stabilizing transformations are used to transform Poisson noisy images to Gaussian noisy images. Therefore, we can utilize advantages of the fast denoising algorithm based on the alternative direction method of multipliers. In experiments, we evaluate denoising quality by the Peak signal-to-noise ratio and the Structure Similarity metrics. Comparing results show that our method outperforms other similar denoising methods.
关键词： ROF model,Variance Stabilizing Transformations,Image Denoising,Poisson Noise,Medical Image Processing
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE 2nd 5G World Forum (5GWF) - Dresden, Germany (2019.9.30-2019.10.2)] 2019 IEEE 2nd 5G World Forum (5GWF) - The Optical Fiber and mmWave Wireless Convergence for 5G Fronthaul Networks
摘要： In this paper, we have addressed and reported the principal technologies part of the next generation mobile fronthauling networks, namely 5G fronthaul. We also described the main features of these technologies and illustrated their benefit via current and challenging bottleneck network conditions by involving real world scenarios with high demand for innovative solutions. These technologies (such as ribbon optical fibers, RoF, passive WDM, mmWaves) will be most likely implemented in the 5G fronthaul infrastructure. Among these technologies, several technical challenges remain to be addressed such as cost-efficient hardware solutions for RoF transceivers, simple adaptation of RoF techniques over ribbon fibers, optical beamforming in integrated photonics, seamless interfaces between the ribbon fiber media and the radiating elements in the RU sites, and finally remote power distribution to RUs from CO premises.
关键词： 5G,fronthaul,mmWave,RoF,ribbon fibers,WDM,C-RAN
更新于2025-09-11 14:15:04
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Flexible photonic generation of frequency multiplication millimeter-wave vector signal based on dynamic pre-coding algorithm with dispersion compensation
摘要： The flexible photonic generation of millimeter-wave (mm-wave) vector signal adopting frequency multiplication enabled by two paralleled phase modulators and pre-coded radio frequency (RF) signals based on dynamic pre-coding algorithm is proposed and demonstrated. One driving signal has the original phase information and a phase deviation for dispersion compensation while the other signal has an opposite phase information and the same compensation phase. The amplitude depends on that of the regular vector symbol and the ratio of driving voltage to half-wave voltage of the phase modulator (PM). Two RF signals modulate the identical light waves from one laser via phase modulators respectively. The light waves are then transmitted over a fiber link after the selection of proper orders of harmonics by the wavelength selective switch (WSS). At the receiver, the optical signal is applied directly to a photodetector (PD) to generate the mm-wave vector signal at the desired frequency. The simulation of proposed scheme with radio over fiber (RoF) link transmission has been build. The result shows that the error vector magnitude (EVM) of generated 60GHz, 100GHz, and 140GHz 16 quadrature-amplitude-modulation (QAM) signals of 1Gb/s is no more than 20% after 80 km fiber transmission when the power into PD is no less than -10 dBm under ideal condition.
关键词： mm-wave generation,dispersion compensation,RoF,frequency multiplication,pre-coding
更新于2025-09-11 14:15:04
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RoF system based on phase modulator-employing polarization for linearization
摘要： In this paper, an analytical model is represented to analyze and improve the performance of radio over fiber (RoF) links against nonlinear distortion. RoF transmission link comprised of a phase modulator, polarizer and optical filter is considered. By controlling angles of polarization, the signals are fed to the modulator. Polarizer helps to suppress intermodulation distortion along the considered link. Performance is found in terms of spurious-free dynamic range (SFDR). Results show an improvement of 7.5-dB in SFDR for a polarized link in comparison with the conventional link.
关键词： Polarizer,IMD,SFDR,RoF,Nonlinear distortion
更新于2025-09-10 09:29:36
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Remote Optical Frequency Up-converter based on Optoelectronic Oscillator
摘要： A remote optical frequency up-converter utilizing an electro-absorption modulator based optoelectronic oscillator (EAM-OEO) for radio-over-fiber (RoF) application is proposed and experimentally demonstrated. The proposed remote optical frequency up-converter has no data leakage from optical baseband signal and no phase noise degradation stemming from optical baseband data leakage because the optical baseband signal is optically isolated from the OEO feedback loop by an optical band pass filter. Compared with the conventional remote optical frequency up-converter based on an EAM-OEO, the proposed system shows improved phase noise characteristics and receiver sensitivity.
关键词： remote optical frequency up-conversion,passive optical network (PON),Optoelectronic oscillator,radio-over-fiber (RoF)
更新于2025-09-10 09:29:36
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Medium-Transparent Packet-Based Fronthauling for 5G Hot-Spot Networks
摘要： In order to meet the traffic density requirement and cope with the technical challenges of hot-spot scenarios exhibiting extreme user density in very confined geographical areas, the fifth generation (5G) networks must undergo radical technological and architectural innovations that support a broad solution portfolio. This solution mix includes spectrum expansion to the millimeter Wave (mmWave) band, massive Multiple-Input Multiple- Output antennas and network densification through remote radio head deployment. Since the current Common Public Radio Interface-based mobile fronthaul cannot cope with massive mmWave multi-Gbps traffic streams, it is imperative to introduce a novel converged 5G architecture, specifically designed to facilitate mmWave access to massive amounts of users. To this end, a Medium Transparent Medium Access Control (MT-MAC) protocol has been proposed, designed to operate over a converged mmWave analog Fiber-Wireless (FiWi) fronthaul. MT-MAC allows for fast and direct negotiation of wavelength, radio frequency and time resources between the base band unit and the mmWave users, while offering fast on-demand link formation. However, its performance has not yet been evaluated under 5G heavy-traffic scenarios, as the ones previously described. Hence, in this paper, we investigate the performance of an MT-MAC-enabled fronthaul and report on its suitability for mmWave hot-spot 5G access networks.
关键词： fronthaul,optical-wireless,millimetre wave (mmWave),C-RAN,passive-optical-networks (PON),radio-over-fiber (RoF)
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 23rd International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD) - Barcelona (2018.9.17-2018.9.19)] 2018 IEEE 23rd International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD) - The Fronthaul Infrastructure of 5G Mobile Networks
摘要： The next wave of innovation will certainly generate numerous new opportunities for emerging technology solutions based on networking services and applications with stringent key performance indicators (KPIs) such as ultra-low 1 ms latency, a 1000 fold bandwidth increase, 99.99% reliability and availability, which are immensely above those supported by current mobile networks. A new architecture of mobile networking called cloud radio access network (C-RAN) has been introduced over the last few years not only to supporting these indicators, but also to increasing scalability, manageability, and flexibility of mobile systems. In this context, this paper addresses the principal technology enablers and their features for C-RAN fronthaul architectures of the 5th generation (5G) mobile networks, namely space-division multiplexing (SDM), massive multiple-input multiple-output (MIMO) signaling, analog radio-over-fiber (A-RoF), and millimeter wave (mmWave) frequency technology. These technologies pave the way towards a truly viable and efficient fronthaul infrastructure for 5G mobile communications with connectivity for thousands of users and strict latency control. In this fashion, we perceive a network infrastructure scenario with seamless starting and ending interfaces by exploiting space diversity in both radio frequency and optical domains with efficient integrated photonics technology - all combined with adaptive software-defined network programming, so as to satisfy the 5G KPIs. Furthermore, we address the most relevant features of these technologies as a potential guideline for potential fronthaul infrastructure deployment of next generation mobile networks.
关键词： SDM,C-RAN,KPI,5G,MIMO,mmWave,A-RoF
更新于2025-09-04 15:30:14
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[IEEE 2018 2nd International Conference on Trends in Electronics and Informatics (ICOEI) - Tirunelveli, India (2018.5.11-2018.5.12)] 2018 2nd International Conference on Trends in Electronics and Informatics (ICOEI) - Improving the Performance of RoF System by FBG in a CS-DSB Based Wavelength Reuse Incorporating Coherent Detection and DSP
摘要： Improving the performance of a bidirectional radio over fiber (RoF) link by the use of fiber Bragg grating(FBG) in a carrier suppressed double sideband(CS-DSB)modulation based wavelength reuse incorporating coherent detection and signal processing unit like DSP is proposed. A comparison study is used to evaluate the performance improvement by the use of FBG. At the transmitter, a downstream optical signal containing optical sideband+carrier(OSSB+C)is generated and transmitted to base station via a single mode fiber(SMF). The signal received is reused at the base station, in two ways in order to study the performance improvement of RoF by the use of FBG. The optical single side band and carrier is separated by the help of a FBG. The carrier is further reused for the upstream signal transmission and the downstream signal can be recovered. The upstream signal is recovered using coherent detection along with DSP unit to avoid the noise due to the phase difference from the transmitter laser source and to eliminate the cross talk effects.
关键词： RoF,Wavelength Reuse,Phase noise cancellation (PNC),Digital signal processor (DSP)
更新于2025-09-04 15:30:14