Patent ID: 8768175

Claim:
A method to perform four-dimensional optical multiband OFDM communication, comprising: organizing an N-dimensional (ND) signal constellation points as a signal matrix; performing 2D-inverse FFT and 2D-FFT to perform modulation and demodulation, respectively; applying both orthogonal polarizations in the OFDM communication to deal with chromatic dispersion, PMD and PDL effects, and multidimensional signal constellation to improve optical signal-to-noise ratio (OSNR) sensitivity; and comprising performing a 4D mapping and writing outputs of 4D mapping column-wise into a 4×M symbol-like interleaver and providing to a two-dimensional inverse discrete Fourier transform (2D-IDFT) with s ⁡ ( n → ) = ∑ k 1 = 0 M - 1 ⁢ ∑ k 2 = 0 M - 1 ⁢ X ⁡ ( k → ) ⁢ ⅇ j ⁢ ⁢ n → ⁢ ⁢ k → ⁢ ⁢ 2 ⁢ ⁢ π / M , k → = [ k 1 ⁢ ⁢ k 2 ] T , n → = [ n 1 ⁢ ⁢ n 2 ] T to generate s ⁡ ( n → ) = [ s ⁡ ( n 1 , n 2 ) ] M × M = [ s 00 s 10 … s M - 1 , 0 s 01 s 11 … s M - 1 , 1 ⋮ ⋮ … ⋮ s 0 , M - 1 s 1 , M - 1 … s M - 1 , M - 1 ] , where s ij =(s ijJ s ijO ), with subscripts I and Q corresponding to in-phase and quadrature channels, respectively.