All optical sampling orthogonal frequency division multiplexing systems

• Published in: 9th International Conference on Optical Communications and Networks (ICOCN 2010) pp. 120 - 124
• Main Authors: Hongwei Chen, Xingyao Gu, Minghua Chen, Shizhong Xie
• Format: Conference Proceeding
• Language: English
• Published: Stevenage IET 2010
• Subjects: Fibre optics; Integral transforms; Laser beam modulation, pulsing and switching; mode locking and tuning; Modulation and coding methods; Optical communication; high-speed optical techniques; all-optical sampling orthogonal frequency division multiplexing; optical gates; receiver structure; spectral analysis; single-carrier optical systems; optical receivers; dispersion tolerance; PAPR; AOS-OFDM system; spectral efficiency; peak to average power ratio; OFDM modulation; fiber nonlinearity tolerance; discrete Fourier transforms; optical cyclic postfixes; high speed real-time OFDM system; optical DFT modules; AOS-OFDM scheme; coherent OFDM system; electronic digital processing; all optical sampling orthogonal frequency division multiplexing systems; inverse discrete Fourier transform; optical modulation; optical domain; ultra short pulses; real-time systems; optical samples; forward discrete Fourier transform; optical fibre dispersion; OCP; DFT/IDFT modules
• ISBN: 9781849193146; 1849193142
• DOI: 10.1049/cp.2010.1167

A novel all-optical sampling orthogonal frequency division multiplexing (AOS-OFDM) scheme with optical cyclic postfixes (OCP) inserted is proposed and demonstrated. Ultra short pulses are used as optical samples and processed by forward and inverse discrete Fourier transform (DFT/IDFT) modules in optical domain. Optical CPs can be added in the proposed optical DFT modules, which can eliminate optical gates and simplify the receiver structure. In this scheme, high speed real-time OFDM system can be realized without limitation of electronic digital processing. AOS-OFDM system is suitable for different modulation formats, and it has better spectral efficiency and dispersion tolerance than traditional single-carrier optical systems. Compared to coherent OFDM system, it has better fiber nonlinearity tolerance for the low peak to average power ratio (PAPR) induced with fewer sub-carriers.