Chromatic dispersion is one of the most significant impairments in long-distance fiber-optical communications. Electrical domain compensation of optical chromatic dispersion by signal predistortion using digital processing is investigated with two different approaches: using a linear digital FIR compensating filter and using a nonlinear filter based on a look-up table (LUT). The linear compensa...

We briefly review how to obtain N = 1, 2 Poincaré supergravity theories in four dimensions from the corresponding conformal theories. We then present our recent works on the supersymmetrization of their leading string correction. We show that, in the ”old minimal” formulations of these theories, when going on-shell the auxiliary fields which come from multiplets with physical fields cannot be e...