Feed-forward carrier phase recovery for optical communications
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United States of America Patent
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Oct 14, 2014
Grant Date -
Dec 12, 2013
app pub date -
Jun 3, 2013
filing date -
Jun 23, 2010
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Abstract
The carrier phase of a carrier wave modulated with information symbols is recovered with a multi-stage, feed-forward carrier phase recovery method. A series of digital signals corresponding to the information signals is received. For each digital signal, a coarse phase recovery is performed to determine a first phase angle which provides a first best estimate of the information symbol corresponding to the digital signal. Using the first best estimate as input, a second stage of estimation is then performed to determine a second phase angle which provides an improved (second) best estimate of the information symbol. Additional stages of estimation can be performed. The multi-stage, feed-forward carrier phase recovery method retains the same linewidth tolerance as a single-stage full blind phase search method; however, the required computational power is substantially reduced. The multi-stage, feed-forward carrier phase recovery method is highly efficient for M-QAM optical signals.
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Patent Owner(s)
- AT&T INTELLECTUAL PROPERTY I, L.P.
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Zhou, Xiang | Holmdel, US | 290 | 2994 |
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