Experimental Demonstration of an IFFT/FFT Size Efficient DFT-Spread OFDM for Short Reach Optical Transmission Systems

Real-time 2037 Gb/s optical OFDM receiver for PON IM/DD systems

“…There are only 3 systems ( [6], [7] and our proposal) that achieve efective bit rates (i.e., after excluding CP and FEC overheads) greater than 10 Gb/s over 20 km SSMF with similar BW. Big size FFT and low-order modulation are used in [6], low size FFT and high-order modulation are used in [7], and high size FFT and high-level modulation are used in this work. Both previous works [6,7] employ AWG and DSO together with oversampling technique.…”

“…Big size FFT and low-order modulation are used in [6], low size FFT and high-order modulation are used in [7], and high size FFT and high-level modulation are used in this work. Both previous works [6,7] employ AWG and DSO together with oversampling technique. The use of this technique reduces quantization noise, improve the analog frequency response of DACs and ADCs and relaxes the design constraints for the anti-aliasing filters.…”

“…In [6][7][8] 64-, 256-, 1024-QAM modulation formats have been employed in intensity-modulated and direct-detected OOFDM (IM/DD-OOFDM) systems where the received electrical signal was captured by a digital sampling oscilloscope (DSO) and later processed offline. However, a real-time hardware implementation should take into account additional requirements like the fixed point precision or the clock speed.…”

“…To the best of our knowledge, 10.44 Gb/s 16 to 256-QAM OOFDM real-time system with an SE of 4.85 b/s/Hz over 20 km standard single-mode fiber (SSMF) using HD-FEC is the highest bit rate [13] that has been reported in a low-cost real-time IM/DD single-band singlewavelength OOFDM PON system. There are other systems with higher bit rates where the processing is done offline [6][7][8]17], or use very expensive components [18], or frequency-division multiplexing [19,20], or wave-division multiplexing [21][22][23].…”

A Novel Low Complexity GA Based PTS Method for PAPR Reduction in OFDM Systems

“…of sub-blocks and W phase weights, there are W V-1 possible PTS candidates, the candidate signa having least signal peak and minimum PAPR will be chosen as candidate for transmission. Computational complexity in terms of additions and multiplication for PTS will be given as follows equation (4,5):…”