Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1988-12-22
1989-09-19
Sikes, William L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350 9616, 455600, 455612, 455617, G02B 626, G02F 100
Patent
active
048675199
ABSTRACT:
The diffuser is made from N=2.sup.n light ducts divided into two sets of 1/2N ducts, with every other duct belonging to a different one of the sets. The two sets of ducts are helically wound in opposite directions but at the same helical pitch over a cylinder (1). Each duct in either set crosses over the 1/2N ducts in the other set, and couplers are provided at those cross-overs between any given duct and the 1/2N ducts of the other set having cross-over numbers 2.sup.q, where q=0, 1, 2, . . . , (n-1). The diffuser has stages each comprising 1/2N couplers, with each stage being disposed in a ring around the cylinder.
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Fraise Muguette
Le Roy Guy
Healy Brian M.
Sikes William L.
Societe Anonyme dite: Alcatel Cit
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