Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2011-04-05
2011-04-05
Curs, Nathan M (Department: 2613)
Optical communications
Receiver
Including postcompensation
C398S208000
Reexamination Certificate
active
07920798
ABSTRACT:
A receiver converts an analog signal, derived from light pulses in a GPON fiber optic system, to clean digital electrical signals. A photodetector and transimpedance amplifier (TIA) convert the light pulses to analog electrical signals. A reset signal generated by a media access controller (MAC) in the GPON system signifies the start of a new burst of data. The receiver has a switchable low pass filter that establishes the threshold voltage for determining whether the analog signal is a logical 1 or a logical 0. At the very start of a new burst, the low pass filter has a fast time constant to quickly establish the threshold voltage for the burst. At a later time during the burst, the low pass filter is switched to have a slow time constant to create a relatively stable threshold voltage.
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patent: 2003/0067662 (2003-04-01), Brewer et al.
patent: 2003/0086516 (2003-05-01), Wagner
patent: 2003/0092411 (2003-05-01), Ivry
patent: 2008/0212716 (2008-09-01), Miremadi et al.
Micrel SY88903AL data sheet, Feb. 2007 [online], retrieved on Jul. 12, 2010. Retrieved from the Internet <URL: http://www.micrel.com/—PDF/HBW/sy88903al.pdf>.
Hoang Katherine T.
Wong Thomas S.
Curs Nathan M
Micrel Inc.
Patent Law Group LLP
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