Optical communication system for transmitting RF signals downstream and bidirectional telephony signals which also include RF control signals upstream
First Claim
Patent Images
1. An optical distribution terminal, comprising:
- a transceiver coupled to an input fiber, the transceiver including;
a first photodiode for receiving optical video signals transmitted on the input fiber at a first wavelength;
a second photodiode for receiving optical telephony signals transmitted on the input fiber at a second wavelength; and
a laser diode for transmitting multiplexed return signals on the input fiber at the second wavelength, the multiplexed return signals including telephony return signals and video return signals;
distribution circuitry for transmitting the received video and telephony signals to a plurality of subscribers and for receiving the telephony return signals and the video return signals from the plurality of subscribers; and
a multiplexer for combining the telephony return signals and the video return signals to generate the multiplexed return signals.
7 Assignments
0 Petitions
Accused Products
Abstract
A method of transmitting TV signals and bidirectional telephone communication signals on a single optical fiber, existing telephone twisted pair infrastructure, and existing coaxial cable infrastructure. In addition to allowing the downstream transmission of television channels as well as bidirectional telephone communication, the single optical fibers also provides for the upstream travel of television related signals while requiring minimal changes of the existing infrastructure.
102 Citations
23 Claims
-
1. An optical distribution terminal, comprising:
-
a transceiver coupled to an input fiber, the transceiver including;
a first photodiode for receiving optical video signals transmitted on the input fiber at a first wavelength;
a second photodiode for receiving optical telephony signals transmitted on the input fiber at a second wavelength; and
a laser diode for transmitting multiplexed return signals on the input fiber at the second wavelength, the multiplexed return signals including telephony return signals and video return signals;
distribution circuitry for transmitting the received video and telephony signals to a plurality of subscribers and for receiving the telephony return signals and the video return signals from the plurality of subscribers; and
a multiplexer for combining the telephony return signals and the video return signals to generate the multiplexed return signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A system for transmitting video and telephony signals between a central location and a plurality of subscribers, comprising:
-
a fiber optic network coupled between the central location and a plurality of optical distribution terminals, wherein downstream video signals are transmitted over the fiber optic network at a first frequency, and wherein downstream telephony signals and upstream return video and telephony signals are transmitted over the fiber optic network at a second frequency;
wherein the optical distribution terminals each include;
a first optical-to-electrical converter for receiving the downstream video signals at the first frequency and for generating downstream electrical video signals;
second optical-to-electrical converter for receiving the downstream telephony signals at the second frequency and for generating downstream electrical telephony signals;
distribution circuitry for transmitting the downstream electrical video and telephony signals to the plurality of subscribers;
a multiplexer for receiving the upstream return video and telephony signals from the plurality of subscribers and for combining these signals into multiplexed upstream signals; and
an electro-optical transmitter for transmitting the multiplexed upstream signals at the second frequency to the central location. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. An electro-optical transceiver, comprising:
-
an optical coupler for connecting the electro-optical transceiver to an optical fiber;
a first photodiode for receiving optical signals from the optical fiber at a first frequency and for generating electrical signals having a first bandwidth;
a second photodiode for receiving optical signals from the optical fiber at a second frequency and for generating electrical signals having a second bandwidth; and
a laser diode for transmitting multiplexed electrical signals at a third bandwidth onto the optical fiber at the second frequency.
-
Specification