Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2006-12-12
2006-12-12
Phan, Hanh (Department: 2613)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S025000, C398S026000, C398S030000, C398S031000, C398S033000, C398S034000, C398S038000, C398S094000, C398S095000, C398S147000, C398S155000, C398S158000, C398S159000, C398S162000, C398S192000, C398S193000, C398S194000, C398S195000, C398S196000, C398S197000, C398S198000, C398S199000, C398S208000, C398S214000
Reexamination Certificate
active
07149424
ABSTRACT:
A system and method for improving the transmission quality of a WDM optical communications system begins by determining the bit-error rate for an optical channel before forward error correction is performed at a receiver. The pre-corrective bit-error rate is fed back through a feed back circuit that includes a parameter adjustment module which adjusts an optical signal parameter based on the bit-error rate. As examples, the signal parameter may be a channel power, dispersion, signal wavelength, the chirp or eye shape of an optical signal. The feedback circuit may also adjust various parameters within the WDM system, including amplifier gain, attenuation, and power for one or more channels in the system. By adjusting these parameters based on a pre-corrective bit-error rate, transmission quality is improved and costs are lowered through a reduction in hardware.
REFERENCES:
patent: 6433904 (2002-08-01), Swanson et al.
patent: 6934479 (2005-08-01), Sakamoto et al.
patent: 2002/0039217 (2002-04-01), Saunders et al.
patent: 2004/0076430 (2004-04-01), Zaacks et al.
Kamalov Valey F.
Neudecker Albrecht
Phan Hanh
Siemens Communications Inc.
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