All-optical Communication System Based on Orthogonal Frequency-division Multiplexing (OFDM) and Optical Time-division Multiplexing (OTDM)

Download or read book All-optical Communication System Based on Orthogonal Frequency-division Multiplexing (OFDM) and Optical Time-division Multiplexing (OTDM) written by Héctor Cañibano Nuñez and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: [ANGLÈS] We propose and demonstrate a novel principle that combines optical orthogonal frequency-division multiplexing (O-OFDM) and optical time-division multiplexing (OTDM). The principle is based on generating and time-multiplexing an OFDM symbol with a low duty-cycle, thus obtaining a higher aggregate bitrate. In principle the low duty-cycle OFDM symbol can be generated by pulse carving the symbol from a WDM source. In the receiver the obtained OTDM+OFDM signal is time-demultiplexed, which then allows frequency-demultiplexing the different subcarriers with an optical band-pass filter (OBPF). We have performed numerical simulations to identify the dependence of the performance on a number of parameters, for example to optimize the OBPF bandwidth. In an experimental demonstration, we achieve error-free performance for a 640 Gbits/s DPSK OFDM+OTDM signal based in a 50GHz spacing grid, yielding a spectral efficiency of 0,8 bit/Hz/s. Note that the OFDM symbol in the demonstration is achieved from a wavelength selective switch (WSS) based transmitter instead of by pulse carving a symbol from a WDM source.