US 6,674,967 B2 · Fiber-to-the-home (FTTH) optical receiver having gain control and a remote enable

Abstract

A fiber-to-the-home (FTTH) system transmits forward and reverse optical signals, such as video, voice, and data signals, via optical fiber, and includes a plurality of home network units. The home network units include an FTTH optical receiver for receiving at least one of the video, voice, and data signals. A triplexer distinguishes and separates the video, voice, and data signals, wherein the video signals have a first wavelength and the voice and data signals have a second wavelength. The voice and data signals are provided to the home network unit for further processing. The triplexer provides an electrical signal to the amplifier stages. The amplifier stages include a preamplifier stage and a postamplifier stage. A gain control circuit automatically adjusts the gain of the video signal based upon the input power level to the FTTH optical receiver. Additionally, a tilt network performs level compensation for externally located coaxial cable. A video signal is then provided to a video device located within a home via the coaxial cable.

Claims12

Dependent claims

In a fiber-to-the-home (FTTH) system for transmitting forward and reverse optical signals, such as video, voice, and data signals, via optical fiber, the FTTH system including a plurality of home network units, the plurality of home network units including an FTTH optical receiver for receiving at least one of the video, voice, and data signals, and for providing amplified video signals to a video device via coaxial cable, the FTTH optical receiver comprising:

a triplexer for distinguishing and separating the at least one of the video, voice, and data signals, and for converting the video signals to video electrical signals,
wherein the video signals have a first wavelength and the voice and data signals have a second wavelength, and wherein the at least one of the voice and data signals is provided to a home network unit for further processing;
a biasing network for biasing the video electrical signals;
and
an amplifier stage for amplifying the video electrical signals, wherein the amplifier stage comprises:
a preamplifier stage for amplifying the video electrical signals:
a gain control network for receiving a control signal that is indicative to an input power level at the FTTH optical receiver and for adiusting a gain level associated with the amplified video signals:
and
a postamplifier stage for amplifying the adjusted video signals.

6 more elements

a triplexer for distinguishing and separating the at least one of the video, voice, and data signals, and for converting the video signals to video electrical signals, the triplexer comprising:
a video mirror for deflecting the video signals;
and
a video photodiode for converting the video signals to the video electrical signals;
a matching network coupled to the video photodiode for matching the video electrical signals;
a preamplifier stage coupled to the matching network for providing amplified signals;
a gain control circuit for receiving a control signal and for adjusting a gain level associated with the amplified video signals dependent upon the control signal;
an optical power sense circuit coupled to the video photodiode for detecting an input power level of the FTTH system, and for providing the gain control circuit the control signal that is indicative of the input power level;
a postamplifier stage coupled to the gain control circuit for amplifying the adjusted video signals;
and
a tilt circuit for compensating for cable losses present in the coaxial cable routed to the video device.

8 more elements

Dependencies are inferred from the claim text.

Fiber-to-the-home (FTTH) optical receiver having gain control and a remote enable

Life of this patent

Fiber-to-the-home (FTTH) optical receiver having gain control and a remote enable

Life of this patent

Abstract

Claims12