Method and apparatus for deploying forward error correction in optical transmission networks and the deployment of photonic integrated circuit (PIC) chips with the same
First Claim
1. A communication method, comprising the steps of:
- FEC encoding a signal in a first domain, the signal being a first domain signal;
demultiplexing the FEC encoded first domain signal into N segments in the first domain;
inserting data into each of the N segments, the data indicating a start location associated with said each of the N segments;
converting the N segments in the first domain into N segments in a second domain; and
combining the second domain N segments into a combined signal in the second domain for transport on a transmission medium,wherein the first domain is an electrical domain and the second domain is an optical domain.
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Accused Products
Abstract
An apparatus and method for uniformly sharing across a plurality of channel signals FEC coding gain which may be achieved through FEC encoding of a higher baud rate electrical data signal or through multiplexed or combined electrical data signals from multiple data sources prior to their subsequent demultiplexing and separate generation into optical channel signals which are multiplexed and launched onto an optical transmission medium. The optical signal generation is achieved through reverse multiplexing of the higher baud rate data signal or of the multiplexed, FEC encoded plural data signals. Effectively, the coding gain power of the FEC encoder is spread over all the signal channels so that each channel can potentially benefit from performance above the average coding gain thereby increasing the coding gain of the worst noise signal channel and correspondingly reducing its BER at the receiver so that, now, the combined multiple channel signals may be propagated further along the optical transmission medium before signal interception is required, such as required channel signal regeneration (3R). By coding gain averaging, the coding gain is taken from the lesser noise affected channels and spread over all the channels so the higher noised ridden channels obtain an effective increase in coding gain which corresponds to a higher reduction in BER at the optical receiver terminal.
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Citations
33 Claims
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1. A communication method, comprising the steps of:
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FEC encoding a signal in a first domain, the signal being a first domain signal; demultiplexing the FEC encoded first domain signal into N segments in the first domain; inserting data into each of the N segments, the data indicating a start location associated with said each of the N segments; converting the N segments in the first domain into N segments in a second domain; and combining the second domain N segments into a combined signal in the second domain for transport on a transmission medium, wherein the first domain is an electrical domain and the second domain is an optical domain. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for deploying forward error correction (FEC) in transmission networks, comprising the steps of:
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FEC encoding a first multiplexed signal comprising M signals in a first domain at a first baud rate; demultiplexing the encoded multiplexed signal of the first domain into N signals in the first domain at a second baud rate, each of the N signals carrying a plurality of segments; inserting data into each of the plurality of segments, the data indicating a start location of said each of the plurality of segments; converting the first domain N signals into N signals in a second domain; and combining the second domain N signals at the second baud rate into a combined signal for transport on a transmission medium, wherein the first domain is an electrical domain and the second domain is an optical domain. - View Dependent Claims (8, 9, 10, 11)
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12. A method for deploying forward error correction (FEC) in transmission networks, comprising the steps of:
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decombining an FEC encoded combined signal in a first domain and received from a transmission medium into N segments in the first domain; converting the N segments in the first domain into N segments in a second domain; detecting a start location of each of the N segments based on data included in the N segments; multiplexing the second domain N segments into a multiplexed M signal comprising M signals in the second domain; and FEC decoding the first domain multiplexed M signal, wherein the first domain is an optical domain and the second domain is an electrical domain. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for deploying forward error correction (FEC) in transmission networks, comprising the steps of:
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providing an FEC encoded combined signal comprising a plurality of M signals combined in a first domain at a second baud rate; decombining the FEC encoded combined signal of M signals in the first domain into N signals in the first domain; converting the N signals in the second domain into N signals in a second domain, each of the N signals including a plurality of segments; inserting data into each of the plurality of segments, the data indicating a start location of said each of the plurality of segments; multiplexing the second domain N signals into a second domain multiplexed M signal of M signals at a second baud rate; and FEC decoding the second domain multiplexed M signal, wherein the first domain is an optical domain and the second domain is an electrical domain. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A transmission network having a transmitter side and a receiver side, comprising:
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said transmitter side comprising; a plurality data sources for providing a multiplexed M signal including M signals in a first domain and modulated at a first baud rate; an FEC encoder for encoding the multiplexed M signal; a demultiplexer circuit that converts the encoded multiplexed M signal into N signal segments, each of the N signal segments being at a second baud rate in the first domain and including data, the data indicating a start location of said each of the N signal segments; a first converter for converting the N signal segments in the first domain into N signal segments of a second domain; and a combiner for combining the N signal segments of a second domain into a combined signal in the second domain for transport on a transmission medium; said receiver side comprising; a decombiner for receiving said combined signal in the second domain from the transmission medium and decombing said combined signal into N segments in the second domain a second converter for converting the N segments in the second domain into N segments in the first domain; a multiplexer for converting the first domain N segments at a first baud rate into a multiplexed M signal at a second baud rate comprising said first domain M signals each at the first baud rate; and an FEC decoder for decoding the multiplexed M signal, wherein the first domain is an electrical domain and the second domain is an optical domain. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification