Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2005-07-26
2009-06-30
Vanderpuye, Ken N (Department: 2613)
Optical communications
Receiver
Including postcompensation
C398S202000, C398S208000, C398S072000
Reexamination Certificate
active
07555228
ABSTRACT:
An optical line termination comprises a DC current load, power measurement circuitry, upstream data path circuitry and current mirror circuitry. The current mirror circuitry is connected between the DC current load, the power measurement circuitry and the upstream data path circuitry. The DC current load is connected in parallel with a photodiode of the upstream data path circuitry. The DC current load exhibits a substantially fixed load. The current mirror provides a copy of an aggregate current to the power measurement circuitry. The aggregate current is a summation of a current draw by the DC current load and a current draw by the photodiode. The power measurement circuitry is configured for outputting a power level dependent upon the aggregate current. Accordingly, the optical line termination provides for a non-intrusive solution for measuring optical input power and, thereby, enables the measured optical power to be monitored.
REFERENCES:
patent: 6476954 (2002-11-01), Nishizono
patent: 6919716 (2005-07-01), Buehler
patent: 7155133 (2006-12-01), Stewart et al.
patent: 7212798 (2007-05-01), Adams et al.
Ruegg Eugen H.
Stamey Richard C.
Teeter Jason T.
Alcatel Lucent
Vanderpuye Ken N
Woldekidan Hibret A
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