A PAPR Reduction Technique Based on a Constant Envelope OFDM Approach for Fiber Nonlinearity Mitigation in Optical Direct-Detection Systems

On the Optimization of Channel Spacing in the Hybrid WDM-COOFDM System

“…The main disadvantages of CO-OFDM are the coherent detection of OFDM systems is polarization dependent and the OFDM is sensitive to phase noise of the local oscillator. Therefore, CO-OFDM is developing as a promising regulation method in the field of the correspondence [5].…”

On The Selection of Optimum Performance Bounds for CO-OFDM Systems Through Standard Fibers

“…One is its strength against channel scattering and second is simplicity of phase and channel estimation in a period changing environment. [5].…”

Performance Optimization of DDO-OFDM Systems through Genetic Algorithms

“…Orthogonal frequency division multiplexing (OFDM) is attractive for optical communications primarily due to its resilience towards fiber dispersion [1], [2], [3], [4]. Direct-detection optical OFDM (DDO-OFDM) is a promising candidate for access networks, data centers and broadband wireless topologies mainly because of its simplicity at the receiver architecture, beside its disadvantages like optical guard band insertion and power inefficiency [4], [5].…”

“…However, the extensive number of parameters involved in the performance of orthogonal frequency division multiplexing (OFDM) signals transmission in direct-detection optical systems reverberates in design tradeoffs between transmitted signal power, receiver sensitivity, robustness against fiber chromatic dispersion (CD) and overall system spectral efficiency (SE) [2], [3], [6], [7].…”

“…Furthermore, it is well known that the overall SE of DDO-OFDM systems is affected by the frequency guard band which is necessary to prevent subcarriers-to-subcarriers mixing interference (SSMI) [3], [7]. Here also, a design tradeoff must reduce de band gap at the same time that overcomes the unwanted interferences.…”