Optical system with tunable in-fiber gratings

Details Optical system with tunable in-fiber gratings Optical system with tunable in-fiber gratings

1993-06-04

1996-11-26

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359127, 385 47, H04J 1402

Patent

active

055791433

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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