The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this letter, a novel hybrid SLM-PTS algorithm for reducing peak-to-average power ratio (PAPR) influence, is proposed and analyzed in an 10Gbit/s 8QAM-OFDM optical access system. After the serial-to-parallel conversion, transmitted signals are divided into two data subblocks, and one subblock is processed by SLM method and the other is processed by PTS. And then the processed data subblocks are...
This paper presents a robust watermarking algorithm based on the human visual system (HVS) and the two-dimensional discrete wavelet transform (DWT). A watermark scrambled with the Logistic map is embedded into the decomposition coefficients of the multi-level DWT. The contrast sensitivity function (CSF) is expended to the spatial frequency plane to determine the perceptual weight of the embedding...
A novel optical phase modulation signal, the 8 phase-shift keying (8PSK) signal with 33% return-to-zero (RZ) clock, is generated and transmitted in 30-Gb/s optical downlink for broadband optical access application. At the transmitter, the 33% RZ clock is generated by one single-arm Mach-Zehnder modulator, and 8PSK optical signals are generated by cascading three phase modulators. At the receiver,...
In this paper, study on computational complexity is implemented in a bidirectional 60GHz radio over fiber (RoF) system with 5Gb/s 16QAM-OFDM downstream signals generated by selected mapping (SLM) technique. 5Gb/s 16QAM-OFDM signals are transmitted over one 42km SMF-28 and one 0.4m wireless channel. The computational complexity comparison of different schemes with various number of branches is accomplished...
In this paper, based on the prototype of a commercial OM2 multimode fiber product, tap delay lines filter model and mode spatial coupling theory, we establish a complete analytical model for coherent optical multiple-input-multiple-output (MIMO) systems over multimode fiber (MMF) with ring launching and receiving. With this model, we transmitted 10Gb/s QPSK signal with frequency pre-distortion over...
We first experimentally demonstrate bi-directional full-duplex E-band fiber-wireless link over 20-km SMF-28 and 1.5-m free-space based on photonics millimeter-wave generation, independently carrying 2- and 2.5-Gb/s error-free OOK signals by 74- and 84-GHz mm-wave carriers simultaneously.
We experimentally demonstrate pre-equalized W-band RoF system carrying 9.95-Gb/s OOK downlink signal with 19-km SMF-28 transmission and 1.5-m wireless delivery, with BER under 1×10-9 and receiver sensitivity reduction at the BER of 1×10-9 under 0.5dB.
We experimentally demonstrated the seamless integration of 108-Gb/s 80-km SMF-28 transmission and 1-m 100-GHz wireless delivery over a 2×2 MIMO wireless link adopting PDMQPSK modulation, with BER less than pre-FEC limit of 3.8×10-3.
We experimentally demonstrate an 8 × 4.65 Gb/s OFDM RoF system with TDP-based channel estimation over 40 km fiber link and 60 GHz wireless link. Compared with TDA-based method, the overhead can be reduced and 1.8 dB improvement is obtained at BER of 3.8 × 10-3.
We demonstrate that interleaved segmentation technique provides a trade-off between PAPR and computational complexity in 60GHz RoF system with 5Gb/s 16QAM-OFDM downlink. Moreover, the receiver sensitivity is effectively enhanced using this method.
We experimentally demonstrated a 575-Mb/s downstream and 300-Mb/s upstream bi-directional SCM-WDM visible light communication system based on RGB-LED. BERs in all channels are under pre-FEC limit of 3.8×10-3 after 66-cm free-space transmission.
In this paper, a novel configuration of VLC(visible light communication) system based on sub-carrier multiplexing of MIMO-OFDM is proposed. The system consists of a MIMO array of white LEDs to transmit and receive data. The data is respectively modulated by two sub-carriers at 6.25MHz and 12.5MHz. An overview of the system configuration is described, and the transmission experiment is implemented...
µ-law companding and de-companding, which enlarges small signals and compresses large signals, can work successfully in the CO-OFDM transmission system, and µ=1 is the optimal companding coefficient for PAPR reduction.
We demonstrated a novel optical wireless architecture to provide 12.5Gb/s wireless signal at 60GHz mm-wave and 100Gb/s symmetrical wireline service. Some novel enabling techniques are employed to overcome fiber dispersion, reduce the cost and provide super-broadband service.
We demonstrate a network node with two-hop transmission and all-optical label swapping for an O-OFDM 16QAM payload at 1.2Tb/s and an OOK label at 12.5Gb/s. The overall OSNR penalty after label swapping and cascaded transmission is less than 2dB.
We propose and demonstrate a novel scheme to generate a large number of flattened optical subcarriers at low insertion loss using only cascaded phase modulators driven by different frequencies asynchronous sinusoidal sources for Tb/s communication.
This paper has proposed a radio-over-fiber (RoF) link carrying two 10Gb/s 16-QAM mm- wave signal streams. Since the dual-tone 40GHz optical mm-wave are generated by frequency quadrupling via a LiNbO3 modulator and the two QAM signal streams are modulated on each tone by single sideband (SSB) modulation, the frequency requirements of the RF local oscillators and the optical modulators are reduced to...
It is experimentally demonstrated the DGD, GVD tolerance and receiver input power dynamic range can be improved by optimizing power imbalance in a 42.7 Gb/s partial-DPSK receiver. The optimized power ratio at different optical filter bandwidth is studied.
In this paper, we experimentally propose generation, transmission and reception of an optical OFDM-MSK signal in the architecture for seamless integration of radio over fiber system with WDM-PON. Our experimental results suggest that this scheme will be a promising candidate for next generation access network.
A novel scheme to generate coherent 112 optical sub-carriers with subcarrier spacing of 25 GHz is proposed and experimentally demonstrated. By using these coherent optical subcarriers, we have successfully generated 10-Tbit/s (112×100 Gbit/s) single channel optical OFDM polarization multiplexing QPSK signal with the bandwidth of 2.8 THz and the optical signal noise ratio greater than 20 dB (0.1nm...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.