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Tapered velocity optical directional couplers showing 100-percent coupling have been fabricated in thin film form. A computer analysis shows that this type of coupler has greatly improved tolerance properties and does not, in particular, suffer from the severe tolerance restriction placed on velocity synchronism in conventional uniform couplers.
Microwave Theory and Techniques, IEEE Transactions on (Volume:23 , Issue: 1 )
Date of Publication: Jan 1975