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In this paper, fairness-aware dynamic subcarrier allocation (DSA) in a distance-adaptive modulation orthogonal frequency division multiple access passive optical network (OFDMA-PON) is proposed and experimentally demonstrated for elastic lambda aggregation networks (EXANs). By applying the distance-adaptive modulation function to OFDMA-PONs, the system can change the transmission parameters (modulation...
We propose a dynamic subcarrier allocation algorithm based on transmission parameters and traffic conditions. Real-time demonstration confirms that our algorithm can greatly improve fairness of frame loss rate among ONUs compared to fixed subcarrier allocation.
We have developed the first 2 µm wavelength tunable distributed Bragg reflector (DBR) laser diode. The 2 µm DBR laser enables us to obtain a continuous wavelength tuning range of 5.6 nm with a single tuning current.
A microgrid for the purpose of reducing the fuel consumption at the Japanese Showa Base in the Antarctica is being considered due to the increase in fuel consumption in the base caused by the continuous increment in research activities. In this paper, the planning of the operation of the engine generators at a representative day using a simplified mixed integer programming is proposed for this microgrid.
We propose a short wavelength region (1.1∼1.2 µm) WDM access system that employs a direct laser modulation technique, and where each wavelength is designed to optimize the pulse compression effect whose degree depends on SMF length and wavelength.
One of the most crucial issues for the present attoscience is to increase the energy of isolated attosecond pulses (IAP's). Typical pulse energy of IAP's reported before is order of pJ, which is enough for streaking-type experiments[1], but not for fundamental pump-and-probe-type experiments using IAP's only. For this purpose, there are two crucial experimental challenges to demonstrate; one is to...
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