Stokes vector receivers have attracted attention for their ability to enhance spectral efficiency due to the increase in the number of dimensions compared to conventional intensity-modulation and direct-detection (IM-DD) systems. One of the technical advantages of the Stokes receiver is that the original state-of-polarization (SOP) of a transmitted signal can be retrieved with digital signal processing (DSP) even if it is fluctuated during fiber transmission. In this paper, we review DSP technologies for SOP recovery, focusing on the modified constant modulus algorithm (CMA), and the radius directed equalization (RDE) algorithm in the Stokes space. Using computer simulations, we show that these algorithms can track random SOP fluctuations without any penalties.
Shota Ishimura and Kosuke Nishimura, "DSP technologies in the Stokes vector receivers for short-reach optical transmission systems," Proc. SPIE 10560, Metro and Data Center Optical Networks and Short-Reach Links, 1056004 (Presented at SPIE OPTO: January 30, 2018; Published: 30 January 2018); https://doi.org/10.1117/12.2291417.
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