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OFDM has emerged as a promising modulation technique in long-haul and access optical networks. The computational complexity of the format can be met with powerful digital signal processors, and especially by exploiting all-optical signal processing.
The discrete Fourier Transform (DFT) or its more popular efficient algorithm, the Fast Fourier Transform (FFT) is one of the important mathematical functions in the toolbox of signal processing. To this date its processing speed is limited by the underlying electronic processors. We show that FFT signal processing limitations can be overcome by performing the FFT in the optical domain and demonstrate...
A μIMU which consists of microelectromechanical systems (MEMS) accelerometers, gyroscopes and magnetometers has been developed for real-time estimation of human hand motions. Along with appropriate transformation and filtering algorithms, the μ IMU was implemented as a Ubiquitous Digital Writing Instrument (UDWI), which could interface with PCs in real-time via Bluetooth wireless protocol, to record...
A complete ETDM system based on monolithically integrated transmitter and receiver modules was demonstrated with BER performance below FEC threshold up to 107 Gb/s. ETDM signal at 112 Gb/s with clear eye opening was also observed.
An optical FFT scheme is implemented and tested at 392 Gbit/s. It enables OFDM signal processing way beyond the bandwidth limits of electronics. The scheme operates with little energy as it exploits passive optical components.
OFDM data with line rates of 5.4 Tbit/s or 10.8 Tbit/s are generated and decoded with a new real-time all-optical FFT receiver. Each of 75 carriers of a comb source is encoded with 18 GBd QPSK or 16-QAM.
In this paper we discuss filtering schemes for performing wavelength conversion with QD-SOA. We identify that the selection of the optimum filter depends on the operating regimes of the nonlinear device. Experimental implementations of the proposed schemes demonstrate efficient wavelength conversion with high quality factors.
High-quality all-optical wavelength conversion is demonstrated with a single QD-SOA followed by a filter. The operation regimes of QD-SOA are identified. It is shown that different filter schemes are needed for the respective regimes.
A 40 Gb/s all-optical modulation format conversion from return-to-zero (RZ) to carrier suppressed return-to-zero (CSRZ) with simultaneous regenerative wavelength conversion is introduced relaying on a versatile scheme of a single SOA followed by a filter.
We demonstrate 40 Gb/s SOA-based wavelength conversion from a RZ into a vestigial-sideband RZ signal. SOA related pattern effects are successfully suppressed by proper choice of the red-shift optical filter.
We propose to suppress intra-channel four-wave-mixing (IFWM) in 40 Gbit/s optical transmission by applying a phase modulation at 10 GHz. Both numerical simulations and experiments show that the penalty induced by IFWM is significantly reduced
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