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Using a lumped-electrode EADFB laser with a modulation bandwidth of ∼59 GHz, we demonstrated single-wavelength single-polarization direct-detection 4-PAM transmission with the record net data rate of 200 Gbit/s.
We propose a novel regenerator site selection scheme for nonlinear impairment-aware elastic optical networks. The proposed scheme reduces bandwidth use by up to 40% in a realistic network by employing only 6 regenerator sites.
We transmit CM DP-16QAM signals at 4.88 b/s/Hz SE in C+L band EDFAs. We demonstrate nonlinearity noise mitigation by MAP-LMS equalizer. We show 2 dB error-correction margin improvement over DP-8QAM after 6,673 km transmission.
We evaluate the transmission performances of 28-Gb/s polar RZ PAM-N (N=2, 3, 4, and 5) upstream signals in 20-km long loopback SSMF link by using a directly-modulated RSOA and direct-detection receiver.
This paper aims at minimizing the cost of transponder pool for dynamic Wavelength on Demand (WoD) services. Combinations of fixed-rate and variable-rate transponders, cost ratios, line rates of WoD requests, and arrival rates are investigated.
We demonstrate the use of MCF for power efficient ultra-high capacity long haul transmission. Feasibility of 105.1 Tb/s transmission over 14,350 km is shown using 12-core fiber and power equivalent of a single pump laser.
56Gb/s ODB signal is generated using 28G silicon photonic modulator, demonstrating 12dB better sensitivity than 56Gb/s NRZ format. High tolerance to dispersion and MPI effects are verified by numerical simulation or experiment without pre/post equalization.
We demonstrated 4-channel high level QAM-DMT transmission over 20-km SMF-28 with real-time reception. 58.72-Gb/s 256QAM-DMT and 56.4-Gb/s 128QAM-DMT signal transmission within 25-GHz grid is achieved with the BER under 2.4×10−2 and real-time reception.
In perceptual audio coders, the audio signal masks the quantization noise. The masking effectiveness depends on the degree of tonality/noisiness of the signal. Hence, in psychoacoustic models (PM) of perceptual coders, the level of the estimated masking thresholds can be adjusted by tonality estimation methods. This paper introduces three envelope analysis methods for tonality estimation: optimized...
Wavelet-OFDM based on the discrete wavelet transform is a multicarrier modulation technique of considerable interest, due to its good performance in several respects such as the peak-to-average power ratio and the interference cancellation, as investigated in the literature. More specifically, the Haar wavelet has been proposed by various researchers as the most attractive wavelet for data transmission...
This paper presents our research in developing high performance but low complexity MIMO decoders for the newest WLAN, i.e. 802.11ac. K-best and Trellis methods are proposed to develop the MIMO decoders. Their performances are observed and compared to MIMO decoders which are based on linear and optimal methods, i.e. ZF, MMSE, and ML. Run test of 2×2 MEMO, 64-QAM, Coding rate 3/4, and 40MHz of bandwidth...
Silicon RF power amplifiers (PAs) are in various RF front end modules (FEMs) today for handset and WLAN applications. Even though III-V semiconductor-based RF PAs can still offer superior frequency and breakdown performance with higher Pout and power-added-efficiency (PAE) and faster time-to-market, silicon-based RF PAs do have the advantages in offering higher monolithic integration with added functionalities...
We present TCAD simulation results for the integration of capacitive modulators in a 300mm SOI platform. We show that tuning the capacitor oxide thickness improves the bandwidth and the component efficiency, leading to 860μm active length, 56Gbps data rate and low power consumption (1.2Vpp).
Recent research and progress have shown that using light-emitting diodes (LEDs) as a high-speed transmitter is a promising candidate in a high-speed data system. The photonic crystal (PhC) LED (PhCLED) can improve the performance of the devices for visible light communication (VLC) due to its unique spatial and temporal management of photonic modes. In this research, the dynamic behaviors of PhCLEDs...
In this paper, we consider the multicast resource allocation problem for video streaming in Orthogonal Frequency Division Multiple Access (OFDMA) systems. The video streams are encoded into base layer (BL) and enhancement layer (EL) data by the hierarchical video coding (HVC) scheme. The basic resource unit is a set of contiguous subcarriers (chunk). The problem is formulated to maximize the sum of...
Next-generation cellular networks require new flexible backhaul technologies. Directed mmWave links with high order modulation can play an important role in cellular backhaul networks. To facilitate the research on such systems, a directional 60 GHz link using complex sub-sampling with a sampling bandwidth of up to 1.8 GHz is presented. The 60 GHz link is fully based on commercially available components...
Bandwidth and power are the major radio resources of a wireless communication system. Designing an efficient wireless communication system requires trade-off between these resources. In this context, definitions of radio resource efficiencies are given in terms of bandwidth efficiency, bit/s/Hz, and power efficiency, bit/Thermal Noise Energy Unit, for an arbitrary communication system. These efficiencies...
Free Space Optics system is an alternative to a wired communication system as it can provide high data rate, low cost, reliable, high transmission rate and security. Due to salient features of optical wireless communication, it has become the center of research in thought of schools of wireless communication. The analysis of modulation schemes is required to improve the efficiency of FSO based transceivers...
In this work, we present three different approaches with the objective of increasing the small-signal modulation bandwidth of InP-based VCSELs beyond 20 GHz. The intrinsic bandwidth limitations are overcome thanks to a highly-strained active region, and an ultra-short cavity design. The parasitic cut-off frequency is enhanced by a double-mesa VCSEL design.
New VLC based wireless backhaul technologies are studied for high data-rate access. In this paper, we summarize the latest progress on VLC systems including pre-/post-equalization hardware, electrical differential receivers, bitloading OFDM, and MRC, which supporting VLC Gigabit capacity over long-range free-space transmission.
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