METHOD AND APPARATUS FOR PERFORMING DIRECT CURRENT (DC) OFFSET CANCELLATION IN AN OPTICAL COMMUNICATIONS DEVICE
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United States of America Patent
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N/A
Issued Date -
Oct 7, 2010
app pub date -
Apr 3, 2009
filing date -
Apr 3, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An apparatus and method are provided that enable a direct current (DC) offset cancellation (OC) feedback control loop of an optical TX or optical RX to be opened and closed and the bandwidth (BW) of the loop to be adjusted based on a status of an input signal to the RX or TX. Opening and closing the loop and adjusting the BW of the loop allows lower data rates to be achieved and allows relatively long patterns of consecutive 1s or 0s to be transmitted or received without being cancelled out due to the low cutoff frequency of the loop. In addition, opening and closing the loop and adjusting its BW allows the foregoing advantages to be realized without causing an increase in the startup settling time period or in the signal detection time period of the optical TX or RX.
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