| http://www.w3.org/ns/prov#value | - As previously described, the optical switch 310 is arranged so that, in its off position, it causes a phase shift in light passing along the modulating arm 306, thereby modulating the intensity of the light in the output waveguide 304. [0084]FIG. 4 of the accompanying drawings is a schematic section through an optical switch (generally designated 400) of the present invention which makes use of di
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