Switch and insertion networks in optical cable TV system

Details Switch and insertion networks in optical cable TV system Switch and insertion networks in optical cable TV system

1994-12-30

1997-08-19

Metjahic, Safet

Television

Special applications

Manufacturing

348 6, 348 13, 455 42, 455 51, 359125, H04N 7173

Patent

active

056593511

ABSTRACT:
An optical cable television system provides a large channel capacity and uses shared resources, whereby the more expensive hardware is shared over a large number of customers so as to minimize the cost per customer. A video switch network is provided which minimizes the temptation of subscribers to pirate signals since pay per view or on demand signals are provided only upon request of someone within a node corresponding to a neighborhood. An on demand program center continuously plays programs, such as movies, at time-staggered starts such that any subscriber will have only very minimal delays before seeing a particular program which is requested. A tuneable optical filter is provided in order to switch video signals onto an optical fiber going to the node in a particular neighborhood. An arrangement uses in-fiber grating in order to remove and insert different optical frequencies. Local insertion of various program sources, such as local commercials, is accomplished effectively by making such insertion at a relatively high point in the video distribution chain. An interface arrangement to provide on demand video signals to telephone company twisted pair wires is utilized.

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