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ABSTRACT: We propose and experimentally demonstrate a cost-effective radio-over-fiber (RoF) system to simultaneously generate and transmit multiband and multi-gigabit 60-GHz millimeter wave (MMW) signals using frequency quintupling technique. Multiband signals at 56-GHz and 60-GHz are realized with two cascaded single-drive Mach-Zehnder modulators (MZMs), where phase control is not required. Furthermore, only low-frequency (≤12GHz) optical and electrical devices are used in the central station (CS), which enable a cost-effective system. At the user-terminal, two-stage down-conversions are employed by envelope detection (ED) and intermediate frequency (IF) mixing, eliminating expensive high-speed synthesizer and critical phase control components. Error-free performances are achieved for the multiband MMW signals after 50-km single-mode fiber (SMF) and 10-ft wireless link transmissions.
Optics Express 04/2013; 21(8):9899-905. · 3.59 Impact Factor
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ABSTRACT: A high-capacity coherent ultradense wavelength-division multiplexing passive optical network integrated with a 60-GHz radio-over-fiber system has been designed and experimentally demonstrated for the first time. In this proposed architecture, millimeter-wave signal generation is achieved by coherent technology, in place of the optical carrier suppression technique, which requires modulators with large bandwidth and precise optical interleavers. The system fully exploits advantages of coherent access networks to provide both multigigabit wired and wireless access services with high spectral and power efficiencies. Successful wireless transmission of multichannel 3.3-Gb/s quadrature phase-shift keying signals with 10-GHz channel spacing over 50-km single-mode fiber (SMF-28) has been achieved.
IEEE Photonics Technology Letters 07/2012; 24(13):1127-1129. · 2.19 Impact Factor
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ABSTRACT: We proposed a new vector signal transmission scheme for double-sideband with carrier-suppressed (DSB-CS) radio-over-flber system. The traditional single-stage DSB-CS scheme will induce signal phase distortion, and is therefore not suitable for vector signal delivery. However, by taking the advantage of the intrinsic local oscillator (LO) power feedthrough at a physical mixer, we found the phase information of the received vector signal would be preserved without introducing any hardware complexity to transmitter and receiver system setup. A feasibility demonstration of transmitting tri-band 16QAM-orthogonal frequency-division multiplexing signal carried by a DSB-CS optical mm-wave has been achieved with a received error vector machine value less than 14.8% after 100-km standard single-mode fiber and over 5-m wireless distance. In addition, the optimal value and dynamic range for the LO input power was investigated and experimentally measured.
IEEE Photonics Technology Letters 02/2012; 24(3):173-175. · 2.19 Impact Factor
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ABSTRACT: We propose and demonstrate a low-cost 40-GHz optical millimeter-wave (mm-wave) generation scheme constructed by the utilization of a frequency-tripling directly modulated Fabry-Pérot (FP) laser. The scheme requires neither a strong optical injection power nor an additional optical filter to select the desired optical sidebands. Error-free transmission of the generated 40.2-GHz optical mm-wave carrying 2.5-Gb/s signal over a 20-km standard single-mode fiber (SSMF) has been experimentally demonstrated. In addition, a performance comparison with the conventional case of an injection-locked FP laser directly driven with a 40.2-GHz RF signal is also simulated, which shows that the presented scheme with highly reduced bandwidth requirement is suitable for mm-wave radio-over-fiber (RoF) systems.
IEEE Photonics Technology Letters 10/2011; · 2.19 Impact Factor
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ABSTRACT: Development of system technology for effective networking infrastructure for next generation e-health applications is addressed. An integrated optical wireless access architecture based on radio-over-fiber technology is proposed in order to provide super broadband, ultra low-latency connectivity among various telemedicine modalities to facilitate real-time and near real-time communication for remote health care services.
Optical Fiber Communication Conference and Exposition (OFC/NFOEC), 2011 and the National Fiber Optic Engineers Conference; 04/2011
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ABSTRACT: We have proposed and experimentally demonstrated the generation of 432 Gb/s (54 Gbaud PM-16QAM) single-carrier optical signal by format conversion from QPSK to 16QAM.
Optical Fiber Communication Conference and Exposition (OFC/NFOEC), 2011 and the National Fiber Optic Engineers Conference; 03/2011
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ABSTRACT: By combining two different system technologies of optical polarization division multiplexing and wireless multiple-input, multiple-output spatial multiplexing, we have successfully demonstrated 2-Gb/s or 5-Gb/s wireless signal transmission over a 60-GHz wireless channel with a doubled spectral efficiency.
Optical Communication (ECOC), 2010 36th European Conference and Exhibition on; 10/2010
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ABSTRACT: We investigate the nonlinear effects resulting from the high peak-to-average power ratio of optical orthogonal frequency division multiplexing (OFDM) signals in the optical fiber transmission. To mitigate this nonlinear impairment of optical signals in long-haul communication systems, we propose and experimentally demonstrate a new scheme of the uniform power transmission of 10 Gb/s OFDM signals over 1040 km single-mode fibers in the direct-detection optical OFDM system.
Journal of Optical Communications and Networking 10/2010; · 1.87 Impact Factor
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ABSTRACT: Delivering affordable high-quality E-health care services requires effective telecommunication and multimedia technologies in conjunction with medical expertise. In this paper, we propose and demonstrate a telecommunication and networking architecture for implementing next generation Telemedicine and Telehealth systems. Our integrated optical-wireless based network provides super broadband, ultra low-latency connectivity for voice, video, image and data across various telemedicine modalities to facilitate real-time and near real-time communication of remote health care information.
2012 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM). 06/2010;
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ABSTRACT: For the first time, a spectrum-compressed very-high-throughput wireless-over-fiber system leveraging duobinary signaling is proposed. Error-free transmission of a 10-Gbps duobinary signal at 60-GHz over 5-km SMF-28 and 6-ft free-space is successfully demonstrated without decoders/demodulators.
Optical Fiber Communication (OFC), collocated National Fiber Optic Engineers Conference, 2010 Conference on (OFC/NFOEC); 04/2010
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11th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, WOWMOM 2010, Montreal, QC, Canada, 14-17 June, 2010; 01/2010
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Proceedings of the Global Communications Conference, 2010. GLOBECOM 2010, 6-10 December 2010, Miami, Florida, USA; 01/2010
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ABSTRACT: We propose a network of bidirectional, wireless data channels, operating in the frequency band of 55–65 GHz, as an efficient means to transfer data between processors and memory nodes distributed on separate boards within the computer box. We address channel throughput, power dissipation, form factor, and crosstalk abatement. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2969–2973, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24779
Microwave and Optical Technology Letters 09/2009; 51(12):2969 - 2973. · 0.62 Impact Factor
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ABSTRACT: We proposed and experimentally demonstrated a novel hybrid subcarrier modulation (H-SCM) technique to generate a spectral-efficient 60-GHz optical millimeter-wave (mm-wave) that carries independent 2.5-Gb/s wireless and 10-Gb/s wireline signals using intensity and phase modulation, respectively. The frequency beating components of the 60-GHz channel due to interleaved and imbalanced optical path in H-SCM are numerically analyzed and experimentally measured in terms of timing jitter and amplitude fluctuation. The generated 60-GHz optical mm-wave signal using H-SCM with phase noise variance of about 0.5 is demonstrated in a radio-over-fiber testbed propagating through a combined distance of 25-km fiber and 4-m free space. The power penalties for the received wireless and wireline signals are 1 and 0.2 dB at 10<sup>-9</sup> bit-error rate, respectively.
IEEE Photonics Technology Letters 09/2009; · 2.19 Impact Factor
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ABSTRACT: A PolMUX 60-GHz MMoF system that simultaneously provides 10-Gbps symmetric independent wired and wireless downstream and wavelength-reuse upstream on same wavelength with high nonlinear tolerance and only 0.2-dB interference penalty is first proposed and demonstrated.
Optical Fiber Communication - incudes post deadline papers, 2009. OFC 2009. Conference on; 04/2009
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ABSTRACT: A novel polymeric four-wavelength multiplexer based on a new design concept of cascaded step-size multimode interferometer (CSS-MMI) is first presented. It can be fabricated by using planar lightwave circuit (PLC) technology and is highly compatible with both current 1-Gbps and future 10Gbps optical transceivers for applications in next generation 1-Gbps and 10-Gbps coexisting time-division-multiplexed passive optical network (TDM PON). By combining two types of proposed CSS-MMI 1??2 wavelength splitters, a compact 1.5cm-long four wavelength multiplexer is realized without requiring complicated design and tedious calculation. In addition, the upstream wavelength channel at 1310 nm has 0.18 dB low insertion loss and three downstream wavelength channels at 1490 nm, 1550 nm and 1590 nm exhibit insertion losses of 1.21 dB, 1.34 dB and 1.02 dB, respectively, with their extinction ratios ranging from 11.71 dB to 32.07 dB.
Optics Express 09/2008; 16(17):12664-9. · 3.59 Impact Factor
