| http://www.w3.org/ns/prov#value | - Although the use has been described of Mach-Zehnder interferometer modulators, preferably made of LiNbO3, it is possible to apply the present invention to various types of modulating means, for example, other than LiNbO3 modulators, as well as electroabsorption modulators, those made of fibre subjected to ???poling???, those made of organic optical crystals or polymers, and similar devices, which
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