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We propose and experimentally evaluate the dispersion tolerance of a data center communication system with DSP equalization free optical duobinary-PAM4. Without dispersion compensation, its dispersion tolerance is three times higher than DFE equalized PAM4.
This paper studies the fully-distributed consensus problem for multi-agent systems with unknown dynamics and bounded external disturbances. The interaction topology of the multi-agent system is assumed to contain a directed spanning tree. Based on adaptive gains, we present the fully-distributed consensus protocol which can obtain consensus without using any global information. The simulation examples...
The Hall-sensor-controlled brushless dc (BLDC) motors have been widely used in a myriad of industrial and commercial applications due to their simplicity and low cost; meanwhile the fault-tolerant operation of Hall sensor drives is receiving renewed attention in recent literature. This paper proposes an innovative fast fault diagnosis (FFD) method for analyzing different fault cases and reconstructing...
A pulse width tunable passively Q-switched fiber laser is demonstrated by using a graphene saturable absorber (GSA) with graphene-covered-microfiber (GCM) structure. Due to the cross absorption modulation (XAM) effect in graphene, the modulation depth of the GSA could be varied from 3.22% to 2.16%%, which results in that the output pulse width and the repetition rate of the laser could be varied from...
We demonstrate a duobinary PAM4 signal for data center communication with experiments and simulations. Without any dispersion compensation mechanism, the optical duobinary PAM4 signal has about three times higher dispersion tolerance in comparison of an ordinary PAM4 signal.
Mobile computing devices facilitate our daily lives, however, overuse of such may cause visual discomfort or even injure our eyes. Thus, personal visual health management is very important. Current eye fatigue examination methods include the critical flicker fusion test and Heuer's 10-point scale questionnaire. However, the flicker fusion system is too heavy and too expensive for general use by average...
Amorphous silicon bolometers with different pixel patterns are investigated for far infrared detection. Devices with floating resonator structure are measured for resistances and temperature coefficient of resistance (TCR) values. The results show normal leg geometry has high TCR (∼ −4%/°C) and moderate resistance. Thus the pixel pattern is suitable for infrared detecting applications.
We experimentally apply MC-CDMA based on OFDM to a 2-meter transmission phosphor-based LED VLC system. MC-CDMA provides highly uniform per-user performances and thus enhances the available communication bandwidth.
For the first time, a period-one (P1) nonlinear dynamic modulated MMW OFDM signal is employed to mobile fronthaul uplink. A proof-of-concept experimental demonstrations show successfully retrieved signals after 1.5-m wireless and 25-km SMF transmissions.
Because of the diversity of cultures, the world has unlimited possibilities for business opportunities. Many countries are proposing involvement in the cultural and creative industry to strengthen their distinctive features, to differentiate their culture from other countries and to avoid assimilation with powerful or neighbouring countries, thereby revitalising their own economies. In countries affected...
In recent years, due to the awareness of the green environment and the worsening of greenhouse effect, governments are paying much attention to this issue. Reducing carbon emission has become an objective of countries. As a result, the concept of carbon tax is to reduce the emission of CO2. By reducing the emission of CO2, we could achieve the coexistence of business and environment. Therefore, in...
We have developed Product-Level Reliability Estimator (PLRE) with budget-based reliability management in 16nm technology. Using EDA tools, the risk of TDDB and EM are estimated from design stage for each design block. They are used to estimate Cumulative Failure Rate (CFR) of the product on various use conditions. Local thermal effects are considered from the design stage for the impact on TDDB and...
A multicarrier code division multiple access technique is experimentally demonstrated to enhance both the power budget and the network flexibility in an IMDD PON with equalized receiving performance among all subscribers over 50 km transmission.
An asynchronous multi-carrier code division multiple access passive optical network upstream is experimentally demonstrated for the first time. Different code lengths with different amounts of active subscribers are investigated in back-to-back and 50-km transmission.
A novel back propagation isolation module is firstly implemented at its powered remote node of the fiber-wireless convergence. Bi-directional multiband transmission, highly uniform receiving performance, and high compatibility are achieved in a long reach scheme.
We proposed and experimentally demonstrated an all-optical phase-preserved format conversion from a 25-Gbps NRZ-QPSK signal to 2×12.5-Gbps NRZ-BPSK signals by applying FWM in a bidirectional orthogonally propagating architecture.
We experimentally demonstrate a polarization-tracking-free PDM IF-over-fiber mobile fronthaul with only a simple optical filter at each receiver for polarization demultiplexing the corresponding signal band. Both spectral and cost efficiencies are largely enhanced.
To improve the Analog to Digital Converter's (ADC's) effective quantizer bits of wideband signals as linear frequency modulation (LFM) signal, a method based on the fractional Fourier transform (FRFT) is proposed. The expression of the signal-to-quantization-noise ratio (SQNR) in the FRFT domain is obtained. In comparison to the traditional methods in the Fourier domain, about 1.5 bits of improvement...
A self-polarization diversity mechanism in a polarization division multiplexing direct detection optical OFDM radio-over-fiber system's backhaul is proposed and demonstrated to double the channel capacity and service coverage without polarization tracking mechanism and receiver modification.
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