In this paper, we propose and experimentally demonstrate the first single-¿ 40 Gb/s 108 multiple-input multiple-output orthogonal frequency-division multiple access (OFDMA) passive optical networks (PON) architecture for next-generation PON systems based on OFDM, polarization multiplexing (POLMUX), direct detection. Superior performance was exhibited after 20 km SSMF transmission a 1:32 split. The novel POLMUX approach greatly simplified receiver-end hardware compared to coherent detectors,...

The result of single-ended traveling wave fault location method based on wavelet transform will be affected by false modulus maxima (WTMM) points. In this paper, distance/impedance information contained in the front is analyzed first. Then, fitting generalized logistic function proposed to extract information. Based results, a predictor-corrector proposed, which includes following content. First, coefficients zero-mode current are used estimate distance and impedance interval. Second,...

The half bridge modular multilevel converter (MMC) coordinated with dc circuit breakers (DCCBs) is one of the most promising solutions for future multi-terminal HVdc system protection. After isolation line fault, electrical quantities remain stable and no coupling relationship exists between healthy faulty poles. Thus, ac adaptive reclose scheme difficult to be applied in transmission systems since information adjacent lines cannot used assess whether fault cleared or not. An innovative...

In this paper, we overview the fundamental principles of next-generation optical Orthogonal Frequency Division Multiple Access (OFDMA)-PON systems, with a particular focus on upstream architectures capable achieving 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> Gb/s colorless transmission. We also propose novel OFDMA-PON architecture that satisfies these requirements and is exceeding transmission over single wavelength. It first...

We propose an efficient survivable FWDM network design algorithm for the first time. Survivable networks are in terms of spectral utilization, power consumption, and cost compared to conventional fixed grid networks.

After the isolation of a single pole-to-ground fault, adaptive auto-reclosing concept in high-voltage dc (HVDC) systems is difficult to be applied due little coupling between poles. With fault ride through capability, hybrid modular mult-ilevel converter (MMC) can advantageous for future HVDC projects. This research proposes an operation MMC-based bipolar systems, based on identification by characteristic signal injection. The proposed method voltage controllability healthy pole MMC inject...

We have proposed and experimentally demonstrated a novel scheme to generate optical millimeter-wave (mm-wave) signals by using single-sideband modulation with low-frequency local oscillator (LO) signals. In this architecture, incorporating the proper dc bias of modulator in central office, mm-wave carriers are generated two times frequency LO signal while largely reducing bandwidth requirement modulator. quantify carrier-to-sideband ratio (CSR) downstream transmission radio-over-fiber (ROF)...

The performance of the traditional derivative-based non-unit traveling wave protection (TWP) in high voltage dc (HVDC) grids shows problem low-sensitivity when high-impedance faults occur. In this article, characteristics fault initial are analyzed first, two conclusions can be drawn: i) distortion degree is related to location, ii) amplitude impedance. Then a zero-sequence current fitting method proposed obtain parameters respectively reflecting impedance and distance. When occurs,...

As the core component of an aircraft generator, health brushless exciter is critical to high-quality generation and flight safety. Its stator field winding prone insulation deterioration under various stresses, leading turn-to-turn short-circuit (TTSC) fault. Diagnosing this type fault, especially in early stage, can greatly enhance safety reliability generators. In paper, on basis analysing effect TTSC current, a fault diagnosis method based mean fractional harmonics current was proposed,...

We propose the coded modulation schemes for ultrahigh-speed transmission (100 Gb/s and above) by using commercially available components operating at 40 gigasymbols/s. The bit-interleaved in combination with low-density parity-check codes that are used as component has been applied. is based on either M-ary quadrature-amplitude or phase-shift keying. bits mapped into corresponding signal constellation point Gray natural mapping. coherent detection scheme found to outperform direct one...

DOI: 10.1049/ic:20070200 ISBN: 978-3-8007-3042-1 Location: Berlin, Germany Conference date: 16-20 Sept. 2007 Format: PDF This paper introduces a novel architecture for next generation passive optical network (PON) based on the employment of OFDMA, with first experimental demonstration 10 Gbps OFDM A transmission using directly modulated laser (DML) in 2.5 GHz channel bandwidth. (2 pages) Inspec keywords: modulation; fibre networks Subjects: Modulation and coding methods; Laser beam...

We propose a novel method to generate transparent pipes for transmission of heterogeneous services over 10-Gb/s OFDMA-PON architecture. successfully demonstrated the simultaneous two PON channels combined with standard WiMAX channel.

We propose a coded polarization-multiplexed iterative polar modulation (PM-IPM) as an enabling coded-modulation scheme for beyond 400Gb/s serial optical transmission. demonstrate that the proposed can achieve transmission over 2250km (for M=16).

We propose a maximum posteriori probability (MAP) turbo equalizer based on the sliding-window multilevel Bahl–Cocke–Jelinek–Raviv algorithm. This scheme is suitable for simultaneous nonlinear and linear impairment mitigation in coded-modulation schemes with coherent detection. The proposed employs large-girth quasi-cyclic LDPC codes as channel codes. demonstrate efficiency of this method dealing fiber nonlinearities by performing Monte Carlo simulations. In addition, we provide experimental...

Employing raised-cosine pulse-shaped PDM-36QAM modulation and both pre- post-transmission digital equalization, we demonstrate 12.5GHz-spaced, 640×107Gbits/s DWDM transmission over 4×80km of ultra-large-area fiber with a record capacity 64Tb/s at 8b/s/Hz spectral efficiency.

The convergence rate of speed estimation is an important criterion to evaluate the performance adaptive full‐order observer (AFO) in speed‐sensorless induction motor drives. Based on analysis rate, AFO with different feedback gains has corresponding shortcomings specific operating regions. Thus, a new proposed design strategy that adopts set regions more appropriate. In this study, below rated uses two optional sets gains. low‐speed regenerative mode, novel enhance stability and provide...

We report the first experimental demonstration of 10 Gb/s free-space optical transmission using orthogonal frequency division multiplexing (OFDM). The OFDM system provides superior performance, with a 3 dB improvement in receiver sensitivity over NRZ OOK.

The first real-time, record-speed 41.25Gb/s 8QAM-OFDM receiver is demonstrated using FPGA-based DSP. Superior upstream WDM-OFDMA-PON performance with variable rate transmission exhibited over 20km SSMF and a 1:32 split.

Hybrid hierarchical optical cross-connects enhance the performance/cost ratio of networks by providing transparent (optical) switching sets wavelengths (wavebands) in addition to opaque (electrical) individual wavelengths. As network bandwidth gets cheaper, and performance bottleneck moves nodes, these systems provide an attractive scalable solution for next-generation networks. We describe key technological components (including flexible nonuniform wavebands) hybrid discuss their implications.

We survey the state-of-the-art in optical orthogonal frequency division multiplexed (OFDM) transmission with direct detection (DD), highlighting cost-effective solutions for OFDM/DD metro/long-haul systems and OFDM-based multiple access passive networks (OFDMA PON).