System for dynamically optimizing a decision threshold...

Details System for dynamically optimizing a decision threshold... System for dynamically optimizing a decision threshold...

2009-01-13

2011-12-20

Nguyen, Dung (Department: 2828)

Optical communications

Optical transceiver

Including compensation

C398S030000, C398S032000, C398S033000, C398S093000

Reexamination Certificate

active

08081879

ABSTRACT:
A transponder having a dynamic remapping circuit remaps a value of decision threshold voltage Vdtc and a value of optical power RXP to a reference voltage Vref to minimize the bit error rate BER of a communication system. The dynamic remapping circuit implements a bilinear mapping of Vdtc and RXP to Vref with three bilinear remapping constants “a”, “b”, and “c” selected to align a remapped value of Vdtc_opt to a selected Vdtc normalization value, Vdtc_norm. A transponder in accord with an embodiment of the invention prevents BER from exceeding a threshold value of BER whether RXP or OSNR, or both, remain constant, change continuously, or change intermittently. Constants “a”, “b”, and “c” are related to parameters resulting from mathematically fitting a line to data comprising Vdtc_opt versus RXP. Another embodiment comprises a method for dynamically optimizing Vdtc and RXP to Vref in a transponder with a bilinear remapping circuit.

REFERENCES:
patent: 6243441 (2001-06-01), Zur
patent: 2006/0075147 (2006-04-01), Schoinas et al.
patent: 2007/0079054 (2007-04-01), Rudelic

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