Signal transmission performance optimization device in a system for transmitting digital data, especially on an optical link
AssigneeAlcatel Cit
InventorsBernard Le Mouel, Fran.cedilla.ois-Xavier Ollivier, Jean-Luc Pamart
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Abstract
A system for transmitting digital information, especially on an optical link, comprises a send end unit and a receive end unit. It includes a device for evaluating the bit error rate at the receiving end and a device for controlling one or more characteristic parameters of the send end unit and/or the receive end unit according to the evaluated bit error rate and in such a way as continuously to optimize the parameter(s) in the light of the actual performance of the transmission system.
Claims6
A signal transmission performance optimization device in a system for transmitting digital data, especially on an optical link, wherein an optical carrier propagates according to two propagation modes, comprising:
- a send end unit,
- a recieve and unit,
- an error correcting decoder localized in said receive end unit, and cooperating with an error correcting coder localized in said send end unit,
- means for evaluating a bit error rate at said receive end unit before error correcting decoding;
- and
- control means for controlling a relative phase between two propagation modes transmitted via said optical link for at least one of said send end unit and said receive end unit according to an evaluated bit error rate and according to an error correcting code employed in said error correcting coder, wherein said relative phase between said two propagation modes is continuously optimized to prevent the bit error rate at an output of said error correcting decoder from exceeding a maximum bit error rate specified for said system.
Dependencies are inferred from the claim text.