Pay-channel transmission system for CATV

Details Pay-channel transmission system for CATV Pay-channel transmission system for CATV

1991-10-07

1993-04-20

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

358 84, 455 2, H04J 1402

Patent

active

052047679

ABSTRACT:
A pay-channel transmission system for a CATV has an optical transmission unit and an optical receiver unit. The optical transmission unit includes pay-channel television signals optically multiplexed by a .lambda..sub.1 wavelength semiconductor laser and non-pay-channel television signals optically multiplexed by a .lambda..sub.2 wavelength semiconductor laser. The optical receiver unit includes an optical filter for filtering the .lambda..sub.1 wavelength data. Thus, a non-subscriber having the optical filter is prevented from receiving the pay-channel television signals, and a subscriber having no optical filter is able to receive both the pay-channel television signals and non-pay-channel television signals.

REFERENCES:
patent: 3751670 (1973-08-01), Grodner
patent: 3899633 (1975-08-01), Sorenson
patent: 4074310 (1978-02-01), Hurneg
patent: 4491983 (1985-01-01), Pinnow
patent: 4891694 (1990-01-01), Way
patent: 4901367 (1990-02-01), Nicholson
patent: 5008934 (1991-04-01), Endoh

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