Chain encoding and decoding of high speed signals
AssigneeCiena Corporation
InventorsShahab OVEIS GHARAN, Kim B. ROBERTS
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Abstract
A method of recovering a value of a symbol received through an optical communications system. A multi-bit estimate of the symbol is subdivided into a first part and a second part, each part including at least one respective bit of the estimate. A most likely value of the first part is detected. The most likely value of the first part is processed using a Forward Error Correction (FEC) decoder to generate a corrected first part value, which is used to detect a most likely value of the second part. The most likely value of the second part is then processed by the FEC decoder to generate a corrected second part, which is combined with the corrected first part to recover the value of the symbol.
Claims21
A method of recovering a value of a symbol received through an optical communications system, the method comprising:
- detecting a most likely value of a first part of a multi-bit symbol estimate;
- processing the detected most likely value of the first part by a Forward Error Correction (FEC) decoder to generate a corrected first part value;
- using the corrected first part value to detect a most likely value of a second part of the multi-bit symbol estimate;
- and
- processing the detected most likely value of the second part by the FEC decoder to generate a corrected second part value.
The method of 9 wherein the two or more dimensions comprise any one or more of:
- at least two phases;
- at least two polarization directions;
- at least two time slots;
- and
- at least two frequencies.
A receiver for recovering a value of a symbol transmitted through an optical communications system from a transmitter, the receiver comprising:
- a first detector for detecting a most likely value of a first part of a multi-bit symbol estimate;
- a Forward Error Correction (FEC) decoder for processing the detected most likely value of the first part to generate a corrected first part value;
- a second detector for detecting a most likely value of a second part of the multi-bit symbol estimate using the corrected first part value;
- and
- the FEC decoder being configured to process the most likely value of the second part to generate a corrected second part value.
Dependencies are inferred from the claim text.