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We have theoretically estimated optical isolation of larger than 30 dB in Co-InGaAsP semiconductor active optical isolators based on nonreciprocal phase shift. The length of the nonreciprocal phase shifting region is as short as 1.3 mm.
We theoretically investigated optical isolation in Co-InGaAsP semiconductor active waveguide optical isolators based on a nonreciprocal phase shift. By appropriate design of the waveguide layer structure and ferromagnetic metal, a large alpha parameter can be obtained, and the optical isolation was estimated to be larger than 30 dB in Mach-Zehnder interferometric waveguide optical isolators. The length...
Preparation of an antibacterial activated carbon fiber with mesopores was attempted. Phenolic resin containing cobalt as an activation catalyst and silver as an antibacterial agent was spun, stabilized, carbonized and activated in steam. The number of the metal particles increased with as activation proceeded and reached to 100–200 nm in diameter at the largest. The activated carbon fiber with 72...
Preparation of an activated carbon fiber containing mesopores was attempted by catalytic activation using cobalt. Phenolic resin and cobalt-acetylacetonate were mixed intimately, spun, cured, carbonized at 900 C in nitrogen and finally activated at 750 900 C in steam. The carbon fibers with the cobalt contents of 38 ppm and 100 ppm were prepared together with a fiber without cobalt as a reference...
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