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We demonstrate a modified constant modulus algorithm (CMA) for polarization de-multiplexing and equalization. By designing the initial tap values for CMA, degeneration of the two polarization tributaries can be avoided.
We propose a digital clock recovery algorithm and demonstrate its tolerance to at least 5 GHz laser frequency mismatch in a 43 Gb/s DP-RZ-QPSK receiver after 1200 km transmission.
We present a novel method to monitor and adaptively optimize digital carrier phase estimation in optical coherent receivers. This guarantees the optimal performance irrespective of the differences and changes in devices and transmission channels.
We present a digital frequency offset compensator for optical coherent QPSK receivers. The compensation accuracy reaches plusmn 30 MHz while the range covers plusmn 5 GHz. This would realize coherent receivers with common off-the-shelf tunable lasers.
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