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Real-time THz-wave wireless OFDM communication, which is assisted by optical technology, is reported. A 4 × 10 Gbit/s THz-wave OFDM signal is transferred into an optical OFDM signal, and the optical OFDM signal is successfully demultiplexed into four sub-carrier channels with an integrated-optic DFT circuit.
In this paper, we show the remarkable timing error (TE) and residual chromatic dispersion (CD) tolerance improvements of the filte bank multicarrier (FBMC) over orthogonal frequency division multiplexing (OFDM) for high-baudrate spectral slicing transmitter and single coherent receiver transmissions. For a 512 Gb/s 16 quadrature amplitude modulated (16QAM) spectrum slicing system at 1600 km of fibe...
In this paper, we propose a novel sampling frequency offset estimation algorithm to improve the performance of the practical intensity-modulation and direction-detection (IMDD)-based OFDM system. For this scheme, only OFDM symbol is used, which reduce the complexity of implement in practical system. And, by taking the relationship of phase rotating of subcarriers into account, we successfully estimate...
We propose a non-pilot aided sampling frequency offset (SFO) estimation algorithm in Multi-IFoF fronthaul with estimation error below 12ppb under SFO range from −100ppm to 100ppm and high robustness at received optical power as low as − 27dBm.
In-band OSNR measurement for CO-OFDM systems using high-resolution spectral analysis is experimentally demonstrated. It is shown that signal and noise levels can be monitored by direct optical spectrum analysis, avoiding the need for data demodulation.
In this paper, we present a novel time domain diversity transmitter (TDDT) for the Spectrally Efficient Asymmetrically and Symmetrically Clipped Optical (SEASCO) OFDM System. SEASCO-OFDM was developed to reduce the complex architecture of two frame ASCO-OFDM. It uses a single frame to combine the individually clipped data on odd and even subcarriers to yield a real non-negative signal. In addition,...
In this paper, we present an S-BVT architecture and its building blocks for multi-adaptive optical transmission in software defined networks (SDNs). We particularly focus on the S-BVT design options, based on multicarrier modulation (MCM), with the ability of generating multiple bands and flows. This allows to adaptively vary the rate, format, bandwidth and reach with fine granularity and large scalability...
In this paper, we develop the conventional Asymmetrically Clipped Optical OFDM (ACO-OFDM) to propose a new OFDM for optical wireless communication with Intensity Modulation / Direct Detection (IM/DD). Although the conventional ACO-OFDM multiplexes only odd subcarriers, we reveal that some even subcarriers do not interfere with odd ones even if we clip their negative signal part. Then, we can superpose...
This paper analyzes the performance of the OS-CDMA system using OFDM technique to enhance the channel data rate, to save power and increase the number of user of OSCDMA systems. This system compared with previous hybrid subcarrier multiplexing/optical spectrum code division multiple-access (SCM/OSCDMA) system. The average received SNR with the nonlinearity of subcarriers is derived. The theoretical...
We propose a coherent optical OFDM system using modified DFT windows to improve dispersion tolerance for ultra-long-haul transmission systems. Simulation results show that the proposed system can greatly enhance the dispersion tolerance compared with the conventional coherent optical OFDM system.
Passive optical network based on orthogonal frequency division multiplexing (OFDM-PON) is a promising candidate for 10 Gb/s and 40 Gb/s or even higher optical access network due to its greater resistance to fiber dispersion. High spectral efficiency is also achieved due to the orthogonality among all sub-carriers which overlap in the frequency domain. In this paper, without optical dispersion compensation,...
We theoretically investigate the performance of realistic all-optical orthogonal frequency division multiplexing (AO-OFDM) system and analyzed effects of OFDM symbol time misalignment and frequency offset between transmitter and receiver on performance of AO-OFDM system. For 10-subcarrier system without cyclic prefix (CP), results shows that the time misalignment gives more penalty in received Q2...
In-band OSNR measurement for IM/DD O-OFDM systems using high-resolution spectral analysis is experimentally demonstrated. It is shown that noise level can be monitored by direct optical spectrum analysis using no polarization analysis or coherence properties and avoiding the need for data demodulation.
We analyze the intercarrier interference (ICI) induced by residual frequency offset (RFO) in optical fast orthogonal frequency division multiplexing (F-OFDM) and compare this scheme with conventional OFDM in two scenarios: 1) the same RFO to subcarrier spacing ratio, and 2) the same discrete cosine or Fourier transform point size. In both scenarios, the ICI on a subcarrier in F-OFDM is dominated by...
In this paper, we present optical orthogonal frequency division multiplexing (O-OFDM) systems using direct detection (DD), suitable for cost-effective applications. A scheme based on discrete Hartley transform (DHT) is proposed and compared to standard O-OFDM implementation. Both asymmetrically clipped (AC) and DC-biased solutions are analyzed for intensity-modulated DD systems. We show that AC is...
Block transmission with frequency-domain equalization (FDE) has been proven as an attractive alternative to orthogonal frequency division multiplex (OFDM) for radio frequency (RF) communication, especially at 60 GHz. In this paper, we show that FDE can be advantageously applied for optical transmission over dispersive channels as well, and in particular, in direct-detection systems. We review the...
We investigate photonic packet switches that allow scaling to a large number of input and output ports. The suggested switch architectures are based on technology that has already been demonstrated. We focus on a simple Spanke node architecture. Scalable, low latency optical packet switches sub-systems capable to switch optical packets with multiple modulation formats are reviewed. The optical packet...
We experimentally demonstrate a receiving method in heterodyne OOFDM system. With multiple channels with delay lines, the speed requirement for electrical devices is reduced when directly receiving the intermediate-frequency signal. No essential deterioration is induced.
An integrated-optic demultiplexer for 8 ?? 10 Gbaud OFDM sub-carrier channels is realized, which comprises a PLC-based 8 ?? 8 optical FFT circuit. It is successfully used to demultiplex a 160 Gbit/s OFDM signal optically.
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