Optical waveguides – With optical coupler – Plural
Patent
1997-06-17
1999-02-09
Lee, John D.
Optical waveguides
With optical coupler
Plural
359113, 359115, 359154, 455 42, 455 51, 455 63, 455296, G02B 6293
Patent
active
058705139
ABSTRACT:
Noise energy and other undesirable signals are suppressed in a return frequency band of a return path of a bidirection cable network. Data signals in a third frequency band and a prybar signal are transmitted on a user site to a mixing tap. The mixing tap contains a filter for eliminating signals in the return frequency band generated at the user site. The prybar signal is received by the mixing tap and activates a local oscillator. The third band signals and oscillation signals are applied to a mixer in the mixing tap and the third band signals are converted to return band signals. This mixing tap then applies the return band to the return path of the cable network.
REFERENCES:
patent: 5134723 (1992-07-01), Carson
patent: 5150365 (1992-09-01), Hirata et al.
patent: 5255267 (1993-10-01), Hansen et al.
patent: 5453868 (1995-09-01), Blauvelt et al.
patent: 5742591 (1998-04-01), Himayat et al.
patent: 5745836 (1998-04-01), Williams
1996 Conference on Emerging Technologies by the Society of Cable Telecommunications Engineers held in San Francisco, CA on Jan. 8-10, 1996; authors are Brian Johanson, Bob Chamberlin, and Aravaman Gurusami; Title: HFC Return System: Management of Subscribing-Induced noise; pp. 263-268.
Cable Television Laboratories, Inc.
Lee John D.
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