Alamouti-type polarization-time coding in coded-modulation schemes with coherent detection | Zendy

Ivan B. Djordjević | Zendy; Lei Xu | Zendy; Ting Wang | Zendy

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Alamouti-type polarization-time coding in coded-modulation schemes with coherent detection

Author(s) -

Ivan B. Djordjević,

Lei Xu,

Ting Wang

Publication year - 2008

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.16.014163

Subject(s) - differential group delay , orthogonal frequency division multiplexing , polarization (electrochemistry) , optics , computer science , spectral efficiency , coding (social sciences) , polarization mode dispersion , optical communication , polarization division multiplexing , algorithm , physics , electronic engineering , telecommunications , mathematics , wavelength division multiplexing , beamforming , statistics , engineering , optical fiber , wavelength , channel (broadcasting) , chemistry

We present the Almouti-type polarization-time (PT) coding scheme suitable for use in multilevel (M>or=2) block-coded modulation schemes with coherent detection. The PT-decoder is found it to be similar to the Alamouti combiner. We also describe how to determine the symbols log-likelihood ratios in the presence of laser phase noise. We show that the proposed scheme is able to compensate even 800 ps of differential group delay, for the system operating at 10 Gb/s, with negligible penalty. The proposed scheme outperforms equal-gain combining polarization diversity OFDM scheme. However, the polarization diversity coded-OFDM and PT-coding based coded-OFDM schemes perform comparable. The proposed scheme has the potential of doubling the spectral efficiency compared to polarization diversity schemes.

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