We demonstrate a timing jitter compensation system by regulating the 10 th harmonic phase difference of mode locked laser pulses for long distance timing distribution. So far we have obtained 48-ps timing jitter of a...
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ISBN:
(纸本)9781424438303
We demonstrate a timing jitter compensation system by regulating the 10 th harmonic phase difference of mode locked laser pulses for long distance timing distribution. So far we have obtained 48-ps timing jitter of a 40-kilometer fiber link.
Thermal behaviors of transformers have a close relationship with the ageing processes of transformer insulation. In oil immersed transformers, feature temperatures such as top-oil temperature and hot spot temperature ...
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Thermal behaviors of transformers have a close relationship with the ageing processes of transformer insulation. In oil immersed transformers, feature temperatures such as top-oil temperature and hot spot temperature are recommended to be monitored online. To minimize the risk of failure and to extend the serving life time of transformers, both temperature rises should be controlled within certain range. However, it is difficult to monitor the hot spot temperature of the transformer. Commonly used method is to calculate the rise of the hot spot temperature based on top-oil temperature rise, as recommended in GB/T15164-94 (Chinese standard) and IEEE C57.91. Later on, electrical-thermal analogy models were developed and proved to be accurate in practice. These electrical-thermal models present heat transfer in the transformers as thermal circuits, where each component represents different thermal distribution in the transformers. General model for the thermal circuits were improved by combining fluid transfer theory into the exponential factors. This paper provides an experimental result which was measured from a 5 kV, 100 kVA transformer equipped with fiber optic probes and thermocouples. The paper also summarizes the most often used models for top-oil temperature and especially hot spot temperature calculation. Comments on both models are given in the paper.
A simple, convenient and accurate technique for measurement of time delay in fiber by using a free-running linear-cavity laser is demonstrated. The uncertainty of time delay was in the order of 10 -7 ~ 10 -6 .
ISBN:
(纸本)9781424438303
A simple, convenient and accurate technique for measurement of time delay in fiber by using a free-running linear-cavity laser is demonstrated. The uncertainty of time delay was in the order of 10 -7 ~ 10 -6 .
We demonstrate the long linear-cavity with ultra-low repetition rate Ytterbium-doped fiber laser mode-locked by a SESAM. Output pulses were highly-chirped, with energies high to 75.2 nJ and minimum repetition rate was...
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ISBN:
(纸本)9781424438303
We demonstrate the long linear-cavity with ultra-low repetition rate Ytterbium-doped fiber laser mode-locked by a SESAM. Output pulses were highly-chirped, with energies high to 75.2 nJ and minimum repetition rate was 191 kHz.
A new InGaAs/InAlAs multi-layer design of broadband SESAM including precise phase shift compensation is proposed. Simulation demonstrates a uniform modulation depth up to 25% for the wavelength from 1000 to 1080 nm.
ISBN:
(纸本)9781424438303
A new InGaAs/InAlAs multi-layer design of broadband SESAM including precise phase shift compensation is proposed. Simulation demonstrates a uniform modulation depth up to 25% for the wavelength from 1000 to 1080 nm.
In recent years, the number of small size wind farms used as DG sources located within the distribution system are rapidly increasing. In this paper, wind farm made up with doubly fed induction generators (DFIG) is pr...
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In recent years, the number of small size wind farms used as DG sources located within the distribution system are rapidly increasing. In this paper, wind farm made up with doubly fed induction generators (DFIG) is proposed as the continuous reactive power source to support system voltage control due to the reactive power control capability of DFIG. The particle swarm optimization (PSO) is utilized to find wind farm optimal reactive power output for distribution system losses reduction and voltage profiles improvement. Finally, the three feeder distribution system is used as a test case to evaluate the algorithm.
A service composition system can be constructed via integration and collaboration of many component services. The system performance needs to be obtained rapidly for the purpose of dynamic and adaptive management. An ...
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ISBN:
(纸本)9781424447374;9781424447541
A service composition system can be constructed via integration and collaboration of many component services. The system performance needs to be obtained rapidly for the purpose of dynamic and adaptive management. An EGSPN (extended generalized stochastic Petri net) model is presented to reflect the service composition system with complex timing constraints in a compact and comprehensible manner. The various categories of timing constraints are associated to place, transition and arc of EGSPN respectively. Furthermore, in order to accelerate the calculation of system performance and to avoid the explosion of state space, a set of model reduction rules are presented. The corresponding reduction algorithms are designed to achieve automatic model reduction. The experiments based on multiform models indicate that a large model can be reduced within satisfying period. The algorithms can help to make rapid performance analysis of service composition system.
We investigated linear-cavity with ultra-low repetition rate Erbium-doped fiber laser mode-locked by a high modulation depth SESAM. Output pulses were highly-chirped, at energy up to 14 nJ and minimum repetition rate ...
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ISBN:
(纸本)9781424438303
We investigated linear-cavity with ultra-low repetition rate Erbium-doped fiber laser mode-locked by a high modulation depth SESAM. Output pulses were highly-chirped, at energy up to 14 nJ and minimum repetition rate was 25 kHz.
A 91.4 kHz repetition rate Er-doped dispersion managed mode-locked fiber laser was demonstrated. The pulse energy was amplified to 790 nJ though single stage amplifier.
ISBN:
(纸本)9781424438303
A 91.4 kHz repetition rate Er-doped dispersion managed mode-locked fiber laser was demonstrated. The pulse energy was amplified to 790 nJ though single stage amplifier.
We report a simplified mode-locked Er fiber laser in normal dispersion with birefringence filters compared with the one with nonlinear polarization evolution mechanism.
ISBN:
(纸本)9781424438303
We report a simplified mode-locked Er fiber laser in normal dispersion with birefringence filters compared with the one with nonlinear polarization evolution mechanism.
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