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A modified carrier phase estimation algorithm based on Viterbi-Viterbi phase estimation method is proposed for high-level square QAM-based optical coherent systems. All of the received symbols are used to estimate the carrier phase in order to enhance the tolerance of laser phase noise. Compared to the previous algorithms, the computation complexity of the proposed algorithm is lower and does not...
Several innovations have been adopted in our portable 532-nm optical frequency standard. Particularly, the authors realized a four-pass scheme equivalent to 1.8-m J2 absorption length, which gives adequate signal-to-noise ratio (~170 in a 10-kHz bandwidth). In addition, an active feedback control has been designed and implemented. The fluctuations of the residual-amplitude modulation in the electrooptic...
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