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We propose a new scheme that adds a butterfly-structured adaptive equalizer in all-digital timing recovery loop to complete synchronization, equalization and polarization de-multiplexing simultaneously. It resolves the incompatible problems that adaptive equalization requires synchronous signal, timing-error detector requires compensated signal. Finally, we demonstrate the feasibility of the scheme by simulation.
© 2009 OSA, IEEE Photonics Society, SPIE, COS, CIC
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