Appeal No. 1997-1982
Application No. 08/483,886
relative phase between two propagation modes according to a
bit error rate evaluated before error correction decoding.
Claim 1 is illustrative of the claimed invention, and it reads
as follows:
1. 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 receive end 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.
The prior art reference of record relied upon by the
examiner in rejecting the appealed claims is:1
We note that the examiner lists LaRosa, U.S. Patent No. 5,323,421,1
Harmon, U.S. Patent No. 4,328,581, and Fukasawa, European Patent Application
2
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