Back to results
US 6,643,471 B2Granted
Increased transmission capacity for a fiber-optic link
AssigneeADC Telecommunications, Inc.
InventorsAravanan Gurusami, Joseph F. Chiappetta
Life of this patent
Estimating the term…
Abstract
An optical communication system is provided. The optical communication system includes an optical fiber, an optical transmitter, and an optical receiver. The optical transmitter is coupled to the optical fiber. The optical transmitter is adapted to encode a pulse amplitude modulated optical signal based on at least two, independent input signals. The optical receiver is coupled to the optical fiber. The optical receiver is adapted to decode the pulse amplitude modulated optical signal to reproduce the at least two, independent input signals as output signals.
Claims67
An optical communication system, comprising:
- an optical fiber;
- an optical transmitter, including:
- a first input adapted to receive serial, digital data from a first source,
- at least one additional input adapted to receive serial, digital data from at least one additional source,
- an encoder circuit, coupled to the first and the at least one additional inputs, that produces an output signal with a selected level based on the serial, digital data from the first and the at least one additional sources,
- wherein the encoder circuit comprises:
- an encoder, responsive to the serial, digital data from the first and the at least one additional sources, that produces a plurality of output signals based on the serial, digital data from the first and the at least one additional sources,
- a plurality of latches, responsive to the plurality of output signals from the encoder, that latch the output signals on a clock signal, and
- a plurality of current switches, responsive to the plurality of latches, that provide selected current levels to the optical modulator to control the level of the pulse amplitude modulation based on the serial, digital data from the first and the at least one additional sources, and
- an optical modulator, coupled to the encoder circuit, that produces a pulse amplitude modulated optical signal based on the levels of the signal from the encoder circuit and that provides the pulse amplitude modulated optical signal to the optical fiber for transmission;
- and
- an optical receiver, including:
- an optical detector, coupled to the optical fiber, that receives the pulse amplitude modulated optical signal and produces an electrical signal with selected levels based on the pulse amplitude modulated signal;
- a decoder circuit, coupled to the optical detector, that reproduces the serial, digital data from the first and the at least one additional data sources based on the electrical signal from the optical detector, and
- a first output and at least one additional output, coupled to the decoder circuit, the first and the at least one additional output provide the reproduced digital, serial data for the first and the at least one additional source, respectively.
12 more elements
An optical communication system, comprising:
- an optical fiber;
- an optical transmitter, including:
- a first input adapted to receive serial, digital data from a first source,
- at least one additional input adapted to receive serial, digital data from at least one additional source,
- an encoder circuit, coupled to the first and the at least one additional inputs, that produces an output signal with a selected level based on the serial, digital data from the first and the at least one additional sources, and
- an optical modulator, coupled to the encoder circuit, that produces a pulse amplitude modulated optical signal based on the levels of the signal from the encoder circuit and that provides the pulse amplitude modulated optical signal to the optical fiber for transmission;
- and
- an optical receiver, including:
- an optical detector, coupled to the optical fiber, that receives the pulse amplitude modulated optical signal and produces an electrical signal with selected levels based on the pulse amplitude modulated signal;
- an optical detector, coupled to the optical fiber, that receives the pulse amplitude modulated optical signal and produces an electrical signal with selected levels based on the pulse amplitude modulated signal;
- a decoder circuit, coupled to the optical detector, that reproduces the serial, digital data from the first and the at least one additional data sources based on the electrical signal from the optical detector,
- wherein the decoder circuit comprises:
- a plurality of comparators, responsive to the electrical signal from the optical detector, each comparator adapted to compare the electrical signal with at least one selected level,
- a decoder, coupled to the comparators, that reproduces the serial, digital data from the first and at least one additional sources based on the comparisons;
- and
- a plurality of latches, coupled to the decoder, that provide the reproduced serial, digital data for the first and the at least one additional sources, and
- a first output and at least one additional output, coupled to the decoder circuit, the first and the at least one additional output provide the reproduced digital, serial data for the first and the at least one additional source, respectively.
14 more elements
An optical communication system, comprising:
- an optical fiber;
- an optical transmitter, coupled to the optical fiber, the optical transmitter adapted to encode a composite optical signal with pulse amplitude modulation based at least two, independent input signals;
- wherein the optical transmitter includes an encoder circuit, the encoder circuit comprises:
- an encoder, responsive to the at least two, independent input signals, that produces a plurality of output signals based on the at least two, independent input signals,
- a plurality of latches, responsive to the plurality of output signals from the encoder, that latch the output signals on a clock signal, and
- a plurality of current switches, responsive to the plurality of latches, that provide selected current levels to an optical modulator to control the level of a pulse amplitude modulated optical signal based on the at least two, independent input signals, and;
- an optical receiver, coupled to the optical fiber, the optical receiver adapted to decode the pulse amplitude modulated composite optical signal to reproduce the at least two, independent input signals as output signals.
4 more elements
An optical transmitter, including:
- a first input adapted to receive serial, digital data from a first source,
- at least one additional input adapted to receive serial, digital data from at least one additional source,
- an encoder circuit, coupled to the first and the at least one additional inputs, that produces an output signal with a selected level based on the serial, digital data from the first and the at least one additional sources,
- wherein the encoder circuit comprises:
- an encoder, responsive to the serial, digital data from the first and the at least one additional sources, that produces a plurality of output signals based on the serial, digital data from the first and the at least one additional sources,
- a plurality of latches, responsive to the plurality of output signals from the encoder, that latches the output signals on a clock signal, and
- a plurality of current switches, responsive to the plurality of latches, that provide selected current levels to the optical modulator to control the level of the pulse amplitude modulation based on the serial, digital data from the first and the at least one additional sources;
- and
- an optical modulator, coupled to the encoder circuit, that produces a pulse amplitude modulated optical signal based on the levels of the signal from the encoder circuit and that provides the pulse amplitude modulated optical signal to an optical output for transmission.
6 more elements
An optical transmitter, including:
- a first input adapted to receive serial, digital data from a first source,
- at least one additional input adapted to receive serial, digital data from at least one additional source,
- an encoder circuit, coupled to the first and the at least one additional inputs, that encodes the serial, digital data from the first and the at least one additional sources into an electrical signal,
- wherein the encoder circuit comprises:
- an encoder, responsive to the serial, digital data from the first and the at least one additional sources, that produces a plurality of output signals based on the serial, digital data from the first and the at least one additional sources,
- a plurality of latches, responsive to the plurality of output signals from the encoder, that latches the output signals on a clock signal, and
- a plurality of current switches, responsive to the plurality of latches, that provide selected current levels to the optical modulator to control the level of the pulse amplitude modulation based on the serial, digital data from the first and the at least one additional sources;
- and
- an optical modulator, coupled to the encoder circuit, that produces a pulse amplitude modulated optical signal based on the electrical signal from the encoder circuit and that provides the pulse amplitude modulated optical signal to an optical output for transmission.
6 more elements
An optical receiver, comprising:
- an optical input, adapted to be coupled to an optical fiber;
- an optical detector, coupled to the optical input, that receives a pulse amplitude modulated optical signal and produces an electrical signal with selected levels based on the pulse amplitude modulated signal;
- a decoder circuit, coupled to the optical detector, that produces a first and at least one additional serial, digital data stream based on the electrical signal from the optical detector,
- wherein the decoder circuit comprises:
- a plurality of comparators, responsive to the electrical signal from the optical detector, each comparator adapted to compare the electrical signal with at least one selected level,
- a decoder, coupled to the comparators, that produces the first and the at least one additional serial, digital data streams based on the comparisons, and
- a plurality of latches, coupled to the decoder, that provide the first and the at least one additional serial, digital data streams to the first and the at least one additional output;
- and
- a first output and at least one additional output, coupled to the decoder circuit, the first and the at least one additional output provide the first and the at least one additional digital, serial data stream, respectively.
6 more elements
An optical receiver, comprising:
- an optical input, adapted to be coupled to an optical fiber;
- an optical detector, coupled to the optical input, that receives a pulse amplitude modulated optical signal and produces an electrical signal based on the pulse amplitude modulated signal;
- a decoder circuit, coupled to the optical detector, that produces a first and at least one additional serial, digital data stream based on the electrical signal from the optical detector;
- and
- wherein the decoder circuit comprises:
- a plurality of comparators, responsive to the electrical signal from the optical detector, each comparator adapted to compare the electrical signal with at least one selected level;
- a decoder, coupled to the comparators, that produces the first and the at least one additional serial, digital data streams based on the comparisons;
- and
- a plurality of latches, coupled to the decoder, that provide the first and the at least one additional serial, digital data streams to the first and the at least one additional output.
6 more elements
A method for encoding serial, digital data, the method comprising:
- receiving a first serial, digital data stream;
- receiving at least one additional serial, digital data stream;
- processing the first and the at least one additional serial, digital data streams to produce a plurality of encoded signals with levels based on the first and the at least one additional serial, digital data streams;
- latching the plurality of encoded signals on a clock signal;
- generating a current signal based on the plurality of latched encoded signals;
- driving a modulator based on the current signal to produce a pulse amplitude modulated optical signal based on the current signal;
- and
- transmitting the pulse amplitude modulated optical signal.
5 more elements
A method for transmitting a plurality of serial, digital data streams over an optical fiber link, the method comprising:
- receiving the plurality of serial, digital data streams;
- processing the plurality of serial, digital data streams to produce a plurality of encoded signals with levels based on the digital data streams;
- latching the plurality of encoded signals on a clock signal;
- generating a current signal based on the plurality of latched encoded signals;
- driving a modulator based on the current signal to produce a pulse amplitude modulated optical signal;
- and
- transmitting the pulse amplitude modulated optical signal.
4 more elements
An optical transmitter, including:
- a first input adapted to receive serial, digital data from a first source;
- at least one additional input adapted to receive serial, digital data from at least one additional source;
- an encoder circuit, coupled to the first and the at least one additional inputs, that produces an output signal with a selected level based on the serial, digital data from the first and the at least one additional sources;
- wherein the encoder circuit comprises:
- an encoder, responsive to the serial, digital data from the first and the at least one additional sources, that produces a plurality of output signals based on the serial, digital data from the first and the at least one additional sources,
- a plurality of latches, responsive to the plurality of output signals from the encoder, that latches the output signals on a clock signal, and
- a plurality of current switches, responsive to the plurality of latches, that provide selected current levels to the optical modulator to control the level of the pulse amplitude modulation based on the serial, digital data from the first and the at least one additional sources;
- and
- an optical modulator, coupled to the encoder circuit, that produces a composite optical signal of pulses of select amplitudes based on the levels of the signal from the encoder circuit and that provides the composite optical signal to an optical output for transmission.
6 more elements
Dependencies are inferred from the claim text.