| http://www.w3.org/ns/prov#value | - The improvements in accordance with the present invention are, either together or by themselves, including providing means for modulating the light circulating in the waveguide, dimensioning the length of the annularly closed waveguide to such a size that the round-trip time (??) of the light circulating in the waveguide is longer than the defined coherent time (??k) of the coherent light source o
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