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Opt Lett. 1981 Oct 1;6(10):499-501.

Modal-noise generation in biconical-taper couplers.


The modal noise resulting from the dividing of coherent light in fused biconical-taper star and access couplers is measured. The theoretical explanation of the results is presented. It is found that modal-noise generation is not severe even in those cases in which the light is strongly subdivided by a biconical-taper star coupler with a large number of ports. The performance of most digital fiber systems using such couplers is not expected to be significantly degraded by the measured levels of modal noise.

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