The Experts below are selected from a list of 39567 Experts worldwide ranked by ideXlab platform
Lin Chen - One of the best experts on this subject based on the ideXlab platform.
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experimental demonstration of real time adaptively modulated ddo ofdm systems with a high spectral efficiency up to 5 76Bit s hz transmission over smf links
Optics Express, 2014Co-Authors: Ming Chen, Jin Tang, Lin ChenAbstract:In this paper, a FPGAs-based real-time adaptively modulated 256/64/16QAM-encoded base-band OFDM transceiver with a high spectral efficiency up to 5.76Bit/s/Hz is successfully developed, and experimentally demonstRated in a simple intensity-modulated direct-detection optical communication system. Experimental results show that it is feasible to transmit a raw Signal Bit Rate of 7.19Gbps adaptively modulated real-time optical OFDM Signal over 20km and 50km single mode fibers (SMFs). The performance comparison between real-time and off-line digital Signal processing is performed, and the results show that there is a negligible power penalty. In addition, to obtain the best transmission performance, direct-current (DC) bias voltage for MZM and launch power into optical fiber links are explored in the real-time optical OFDM systems.
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Experimental demonstration of real-time adaptively modulated DDO-OFDM systems with a high spectral efficiency up to 5.76Bit/s/Hz transmission over SMF links.
Optics express, 2014Co-Authors: Ming Chen, Jin Tang, Lin ChenAbstract:In this paper, a FPGAs-based real-time adaptively modulated 256/64/16QAM-encoded base-band OFDM transceiver with a high spectral efficiency up to 5.76Bit/s/Hz is successfully developed, and experimentally demonstRated in a simple intensity-modulated direct-detection optical communication system. Experimental results show that it is feasible to transmit a raw Signal Bit Rate of 7.19Gbps adaptively modulated real-time optical OFDM Signal over 20km and 50km single mode fibers (SMFs). The performance comparison between real-time and off-line digital Signal processing is performed, and the results show that there is a negligible power penalty. In addition, to obtain the best transmission performance, direct-current (DC) bias voltage for MZM and launch power into optical fiber links are explored in the real-time optical OFDM systems.
A Baschirotto - One of the best experts on this subject based on the ideXlab platform.
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an fsk modulator at 23 2 mhz with 0 9 accuracy for the usb power delivery standard
International Symposium on Circuits and Systems, 2015Co-Authors: Antonio Damico, Angelo Nagari, P Malcovati, A BaschirottoAbstract:This paper presents an FSK modulator suitable for a transmitter chain within the new USB Power Delivery standard. The proposed solution performs a binary FSK modulation using a relaxation voltage-controlled oscillator with a voltage averaging feedback. A reference proportional to supply is used to compensate real-time frequency variations, whereas the frequency spread due to the process is corrected by an 8Bit trimming system. The considered input Signal Bit Rate is 300 kbps and the carrier frequency is 23.2 MHz with ±0.5 MHz frequency deviation. The proposed modulator grants ±0.9% accuracy against PVT spread by consuming 1.2 mW and phase noise at 20kHz from the carrier lower than −56 dBc/Hz.
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ISCAS - An FSK modulator at 23.2 MHz with ±0.9% accuracy for the USB power delivery standard
2015 IEEE International Symposium on Circuits and Systems (ISCAS), 2015Co-Authors: Antonio D'amico, Angelo Nagari, P Malcovati, A BaschirottoAbstract:This paper presents an FSK modulator suitable for a transmitter chain within the new USB Power Delivery standard. The proposed solution performs a binary FSK modulation using a relaxation voltage-controlled oscillator with a voltage averaging feedback. A reference proportional to supply is used to compensate real-time frequency variations, whereas the frequency spread due to the process is corrected by an 8Bit trimming system. The considered input Signal Bit Rate is 300 kbps and the carrier frequency is 23.2 MHz with ±0.5 MHz frequency deviation. The proposed modulator grants ±0.9% accuracy against PVT spread by consuming 1.2 mW and phase noise at 20kHz from the carrier lower than −56 dBc/Hz.
J M Tang - One of the best experts on this subject based on the ideXlab platform.
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Multiple Channel Interference Cancellation of Digital Filter Multiple Access PONs
Journal of Lightwave Technology, 2017Co-Authors: Yixian Dong, Ehab Al-rawachy, Derek Nesset, Roger Philip Giddings, J M TangAbstract:By making use of the digital Signal processing (DSP) based software-reconfigurable digital orthogonal filtering, digital filter multiple access passive optical networks (DFMA PONs) have demonstRated great potential for offering excellent backward compatibility with existing PONs and supporting future cloud access networks. However, intensity modulation and direct detection (IMDD) DFMA PONs suffer from imperfect channel orthogonality-induced cross-channel interference. In this paper, a DFMA channel interference cancellation (DCIC) technique is, for the first time, proposed and extensively investigated, to significantly improve the downstream and upstream performance of the IMDD DFMA PONs. A comprehensive DCIC theoretical model is developed, and through fitting with experimental measurements, the developed theoretical model is rigorously verified and a set of accuRate transceiver/system parameters is identified. It is shown that DCIC increases the aggregated upstream Signal transmission capacity by a factor of > 2 and extends the differential optical network unit (ONU) launch power dynamic range by approximately 14 dB. Such significant performance improvements are achieved after just one iteration. Other salient DCIC advantages include ONU count-independent low DSP complexity, small latency and transparency to Signal modulation format, Signal Bit Rate, and initial system operation conditions.
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Experimental Demonstrations and Extensive Comparisons of End-to-End Real-Time Optical OFDM Transceivers With Adaptive Bit and/or Power Loading
IEEE Photonics Journal, 2011Co-Authors: X.q. Jin, Terry Quinlan, J. L. Wei, Roger Phillip Giddings, S. Walker, J M TangAbstract:Experimental demonstrations are reported for end-to-end real-time optical orthogonal frequency division multiplexing (OOFDM) transceivers incorporating three widely adopted adaptive loading techniques, namely, power loading (PL), Bit loading (BL), and Bit-and-power loading (BPL). In directly modulated distributed-feedback (DFB) laser-based, intensity-modulation, and direct-detection (IMDD) transmission systems consisting of up to 35-km single-mode fibers (SMFs), extensive experimental comparisons between these adaptive loading techniques are made in terms of maximum achievable Signal Bit Rate, optical power budget, and digital Signal processing (DSP) resource usage. It is shown that BPL is capable of supporting end-to-end real-time OOFDM transmission of 11.75 Gb/s over 25-km SMFs in the aforementioned systems at sampling speeds as low as 4 GS/s. In addition, experimental measurements also show that BPL (PL) offers the highest (lowest) Signal Bit Rate, and their optical power budgets are similar. The observed Signal Bit Rate difference between BPL and PL is almost independent of sampling speed and transmission distance. All the aforementioned key features agree very well with numerical simulations. On the other hand, BPL-consumed DSP resources are approximately three times higher than those required by PL. The results indicate that PL is a preferred choice for cost-effective OOFDM transceiver design.
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statistical performance comparisons of optical ofdm adaptive loading algorithms in multimode fiber based transmission systems
IEEE Photonics Journal, 2010Co-Authors: Elias Giacoumidis, A. Tsokanos, J M TangAbstract:Detailed statistical investigations of the effectiveness of three widely adopted optical orthogonal frequency division multiplexing (OOFDM) adaptive loading algorithms, including power loading (PL), Bit loading, and Bit-and-power loading (BPL), are undertaken, for the first time, over 1000 statistically constructed worst-case multimode fiber (MMF) links without incorporating inline optical amplification. It is shown that the BPL (PL) algorithm always offers the best (worst) transmission performance. The absolute transmission capacity differences between these algorithms are independent of Signal Bit Rate and increase with both transmission distance and digital-to-analog converter/analog-to-digital converter (DAC/ADC) sampling Rate. More importantly, numerical results also indicate that, for both worst-case and normal-case MMF links of less than 300 m, in comparison with the most sophisticated BPL algorithm, the simplest PL algorithm is sufficiently effective in escalating the OOFDM MMF system performance to its maximum potential. The effectiveness of the PL algorithm can be further improved when a large number of subcarriers are utilized. On the other hand, for relatively long MMF links (> 800 m) with their 3-dB bandwidths being much less than the transmitted OOFDM Signal spectrum, the BPL algorithm has to be adopted. The aforementioned results have great potential for practical cost-effective OOFDM transceiver architecture design.
Bingkun Zhou - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous pulse carving misalignment and π-phase-shift monitoring of a return-to-zero differential phase-shift keying system using a coherent hybrid
Optics letters, 2008Co-Authors: He Wen, Xin Chen, Huan Jiang, Xiaoping Zheng, Hanyi Zhang, Yili Guo, Bingkun ZhouAbstract:A technique for monitoring both the pulse carving misalignment and π phase shift in a return-to-zero (RZ) differential phase-shift keying (DPSK) system based on a phase modulator is proposed and demonstRated. By monitoring the mean-power variation of a hybrid local oscillation lightwave with the modulated Signal lightwave without any delibeRated control, the technique can provide the information on pulse carving misalignment and phase modulation index simultaneously, as the power variation reflects the asymmetric distribution of RZ-DPSK in a Signal constellation diagram. It is characterized as transparent to Signal Bit Rate, central wavelength, and absolute power level. Both the simulation and experiment results show that more than ±15% Bit duration misalignment and ±5% phase shift deviated from π can be detected.
Ming Chen - One of the best experts on this subject based on the ideXlab platform.
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experimental demonstration of real time adaptively modulated ddo ofdm systems with a high spectral efficiency up to 5 76Bit s hz transmission over smf links
Optics Express, 2014Co-Authors: Ming Chen, Jin Tang, Lin ChenAbstract:In this paper, a FPGAs-based real-time adaptively modulated 256/64/16QAM-encoded base-band OFDM transceiver with a high spectral efficiency up to 5.76Bit/s/Hz is successfully developed, and experimentally demonstRated in a simple intensity-modulated direct-detection optical communication system. Experimental results show that it is feasible to transmit a raw Signal Bit Rate of 7.19Gbps adaptively modulated real-time optical OFDM Signal over 20km and 50km single mode fibers (SMFs). The performance comparison between real-time and off-line digital Signal processing is performed, and the results show that there is a negligible power penalty. In addition, to obtain the best transmission performance, direct-current (DC) bias voltage for MZM and launch power into optical fiber links are explored in the real-time optical OFDM systems.
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Experimental demonstration of real-time adaptively modulated DDO-OFDM systems with a high spectral efficiency up to 5.76Bit/s/Hz transmission over SMF links.
Optics express, 2014Co-Authors: Ming Chen, Jin Tang, Lin ChenAbstract:In this paper, a FPGAs-based real-time adaptively modulated 256/64/16QAM-encoded base-band OFDM transceiver with a high spectral efficiency up to 5.76Bit/s/Hz is successfully developed, and experimentally demonstRated in a simple intensity-modulated direct-detection optical communication system. Experimental results show that it is feasible to transmit a raw Signal Bit Rate of 7.19Gbps adaptively modulated real-time optical OFDM Signal over 20km and 50km single mode fibers (SMFs). The performance comparison between real-time and off-line digital Signal processing is performed, and the results show that there is a negligible power penalty. In addition, to obtain the best transmission performance, direct-current (DC) bias voltage for MZM and launch power into optical fiber links are explored in the real-time optical OFDM systems.