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We have characterized the phase response of a high-bandwidth photodiode up to 26 GHz using 3-λ approach so that laser phase noise has been canceled with a simple digital signal processing (DSP) algorithm.
In this paper, we propose and demonstrate phase switching for either main carrier or subcarriers of two consecutive signal blocks to achieve fading-free double-sideband direct-detection. The proposed approach has twice of the electrical spectral efficiency (SE) of offset OFDM, and the same electrical SE as single-side band OFDM. We perform numerical simulation and verify the system robustness against...
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