Addressable grating modulation system for optical cable TV syste

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element

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359125, 359126, 359169, 359170, H04B 1000

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active

054672120

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.

REFERENCES:
patent: 4642804 (1987-02-01), Personick
patent: 4775971 (1988-10-01), Bergmann
patent: 5026137 (1991-06-01), Tokumitsu
patent: 5283686 (1994-02-01), Huber
patent: 5361157 (1994-11-01), Ishikawa
patent: 5410624 (1995-04-01), Morkel

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