Normalized LMS digital filter for chromatic dispersion equalization in 112-Gbit/s PDM-QPSK coherent optical transmission system |
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Authors: | Tianhua Xu Gunnar Jacobsen Jie Li Ari T Friberg |
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Institution: | a Royal Institute of Technology, Stockholm, SE-16440, Sweden b Acreo AB, Electrum 236, SE-16440, Kista, Sweden c Tianjin University, Tianjin 300072, PR China |
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Abstract: | High bit rates optical communication systems pose the challenge of their tolerance to linear and non-linear fiber impairments. Coherent optical receivers using digital signal processing techniques can mitigate the fiber impairments in the optical transmission system, including the chromatic dispersion equalization with digital filters. In this paper, an adaptive finite impulse response filter employing normalized least mean square algorithm is developed for compensating the chromatic dispersion in a 112-Gbit/s polarization division multiplexed quadrature phase shift keying coherent communication system, which is established in the VPI simulation platform. The principle of the adaptive normalized least mean square algorithm for signal equalization is analyzed theoretically, and at the meanwhile, the taps number and the tap weights in the adaptive finite impulse response filter for compensating a certain fiber chromatic dispersion are also investigated by numerical simulation. The chromatic dispersion compensation performance of the adaptive filter is analyzed by evaluating the behavior of the bit-error-rate versus the optical signal-to-noise ratio, and the compensation results are also compared with other present digital filters. |
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Keywords: | Coherent optical receiver Digital signal processing Chromatic dispersion equalization Polarization division multiplexed quadrature phase shift keying Normalized least mean square algorithm Adaptive finite impulse response filter |
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