A software-defined hybrid passive optical network (HPON) architecture is proposed, in which multiple PON systems using various physical layer (PHY) multiplexing technologies can coexist. The detailed upstream bandwidth allocation procedure is illustrated, and the dynamic bandwidth allocation mechanism in software-defined HPON is primarily investigated. By introducing the concept of virtual PON (VPON), an elaborate staged priority-based dynamic bandwidth allocation (SPB-DBA) mechanism for inter-VPON is proposed, which consists of a delicate two-stage admission scheme of bandwidth allocation to avoid frequent bandwidth reallocation, and an exquisite weighted bandwidth allocation algorithm to allocate bandwidth for VPONs with priority level and bandwidth demand priority differentiation. The simulation results demonstrate that the SPB-DBA mechanism provides distinctive bandwidth support for VPONs with differentiated priority levels and ensures the access fairness among VPONs. Furthermore, the performances in terms of bandwidth utilization, average satisfaction ratio, and packet average delay are significantly improved.
KEYWORDS: Orthogonal frequency division multiplexing, Receivers, Digital signal processing, Interference (communication), Heterodyning, Polarization, Signal to noise ratio, Signal detection, Signal processing, Forward error correction
A downconversion scheme using a pilot-aided blind phase search (PA-BPS) algorithm for phase noise compensation is proposed and experimentally evaluated in coherent optical orthogonal frequency-division multiplexing systems based on optical comb and heterodyne detection. The proposed method can increase the systems bandwidth utilization efficiency and reduce the receiver complexity. Experimental results show that, based on the method, a receiver sensitivity as low as −27 dBm can be achieved in the transmission systems considered. Meanwhile, in each PA-BPS calculation, the method only requires 2 pilots and 10 testing phases.
KEYWORDS: Optical components, Modulators, Signal attenuation, Modulation, Dense wavelength division multiplexing, Digital signal processing, Signal processing, Transparency, Frequency conversion, Signal detection
A digital signal process enabled dual-drive Mach–Zehnder modulator (DD-MZM)-based spectral converter is proposed and extensively investigated to realize dynamically reconfigurable and high transparent spectral conversion. As another important innovation point of the paper, to optimize the converter performance, the optimum operation conditions of the proposed converter are deduced, statistically simulated, and experimentally verified. The optimum conditions supported-converter performances are verified by detail numerical simulations and experiments in intensity-modulation and direct-detection-based network in terms of frequency detuning range-dependent conversion efficiency, strict operation transparency for user signal characteristics, impact of parasitic components on the conversion performance, as well as the converted component waveform are almost nondistortion. It is also found that the converter has the high robustness to the input signal power, optical signal-to-noise ratio variations, extinction ratio, and driving signal frequency.
A novel optical fiber relative humidity(RH) sensor was proposed in this paper based on fiber evanescent wave coupling.
Sol-gel material with porous microstructure as water molecules sensitivity film was dip-coated upon coupling region
surface. Visibility calculated from output optical powers of the coupler sensor was taken to show the sensitivity to
relative humility. From the experimental results, with increasing relative humidity ranged from 25% to 95%, the
visibility decreased in a good linear manner. And the sensitivity was approximate 0.132/RH%. Due to simple technique
and low lost of the fiber coupler relative humidity sensor, it will be applied widely.
The fiber-optic evanescent wave temperature sensor is investigated experimentally, for which the sensing probe consists
of a fiber-optic coupler. The coupling visibility fluctuation of the fiber coupler probe was measured when the
environmental temperature shifted center wavelength of the LD light source. From the experimental results, with the
center wavelength of LD shift to longer wavelength, the transmission loss increased, and the wavelength shift of LD was
about 0.5nm/°C. By using the supermode theory, the effect of wavelength shift of light source on the fiber coupler sensor
was discussed.
KEYWORDS: Databases, Networks, Software development, Network architectures, Telecommunications, Data processing, Human-machine interfaces, Data storage, Process control, Laser range finders
This paper points out the HFC network's current situation that the HFC network is lack of unification management. And this paper also puts forward a method that puts second development on the HP Openview, which is a wildly used network management software, to make it have the ability to manage the HFC device. The current situation in the HFC network can be solved through this method. Meanwhile the realization of the method is described.
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