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Various metal oxides with 0.1 wt% Ag loaded as a cocatalyst were prepared by an impregnation method and examined their photocatalytic activity for CO2 reduction with water. Among all the prepared Ag‐loaded metal oxides, Ga2O3, ZrO2, Y2O3, MgO, and La2O3 showed activities for CO and H2 productions under ultraviolet light irradiation. Thus, metal oxides involving metal cations with closed shell electronic...
Ga2O3 samples with different crystalline structures were prepared by calcination of a gallium nitrate powder around 800 K. Ga2O3 samples with mixed phases of γ and β showed high photocatalytic activity for CO production from CO2 reduction with water, and the activity was even higher than that for an Ag‐loaded β‐Ga2O3. The photocatalytic activity increased with time. The increase was attributed to...
Ultra-long-haul WDM/SDM transmission based on 200 Gbit/s/ch over 5,040 km using cladding pumped seven-core EDFA has been successfully demonstrated for the first time. In addition, the feasibility of the transoceanic transmission based on 100 Gbit/s/ch was confirmed.
200Gb/s-based 95.2-Tb/s transmission using 64-Gbaud PDM-QPSK signals over 6,160-km seven-core fibers has been successfully demonstrated by optimization of optical pre-filtering without high-speed digital analog converter (DAC).
In this paper, recent progress on ultra-dense, space division multiplexed (SDM) optical transmission towards multi-Peta bit/s are reviewed. By using 6-mode 19-core fiber, we have demonstrated 2.05 Pbit/s transmission over 9.8 km just using C-band. High spatial multiplicity of 114 and ultra-high aggregate spectral efficiency of 456 bit/s/Hz/fiber have been achieved.
We present space-division multiplexed transmission with spatial multiplicity over 100 using weakly-coupled-6-mode uncoupled-19-core fiber. Suppressing mode coupling and core-to-core crosstalk, MIMO complexity can be reduced. The record aggregate spectral efficiency over 345 bit/s/Hz is achieved.
We experimentally investigate filtering tolerance of 32-Gbaud DC-PDM-16QAM signals in 75-GHz-grid ROADM networks considering the trade-off between subcarrier-filtering and inter-subcarrier crosstalk.
We compare the transmission performance of 413-Gb/s multi-band OFDM with 32-QAM (7%FEC) and 64-QAM (20%FEC) by simulations. The reachable distance with 64-QAM is longer than 32-QAM due to the filtering effects of 50-GHz-grid ROADMs.
Optical OFDM is a promising technology for highly spectrally efficient (SE) wavelength-division-multiplexing (WDM) system. Furthermore, the bit-rate 400 Gbit/s per WDM channel with SE of 8 bit/s/Hz is expected to be adopted for the next generation WDM system. For the application, optical OFDM is one of promising candidates because of the scalability for higher SE and higher bit-rate using multi-band...
We have successfully demonstrated 3 × 458-Gbit/s Optical Multi-band OFDM transmission over 160 km of SSMF with EDFA-only amplification at 50 GHz WDM spacing by utilizing narrowband optical filter.
Optimization of the joint 32/64-QAM subcarrier modulation is investigated using 3×515-Gbit/s multi-band OFDM transmission over 320-km SSMF with 50-GHz frequency grid. It is confirmed that the optimized joint 32/64-QAM with 20%-overhead FEC enables to increase OSNR sensitivity compared to 32-QAM with 7%-overhead FEC and 64-QAM with 20%-overhead FEC.
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