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Designing a set of DNA base sequences for a large-scale molecular circuit is a difficult problem in the field of DNA computing. A DNA circuit frequently suffers from unintended DNA strand displacements among strands; this problem can ruin the desired function of a DNA circuit. In this study, our aim was to develop a computational tool for the design of DNA base sequences by means of an original algorithm...
This paper presents a novel four-limbed robot, WAREC-1 having high locomotion ability with versatility in locomotion styles. At disaster sites, there are various types of environments where a robot must move such as rough terrain with possibility of collapse, narrow places, stairs, vertical ladders and so on. WAREC-1 moves in hazardous environments by changing locomotion styles: bipedal/quadrupedal...
A deployment scenarios of space division multiplexing (SDM) in metro area network is presented. Comparative studies of few-mode fiber vs. multicore fiber as well as mode division multiplexed (MDM) node architectures of supermode vs. mode-unbundling are discussed.
We demonstrate high-speed modulations in dual-polarization (DP) quadrature phase shift keying and DP 16- and 32-quadrature amplitude modulation formats with radio frequency driving voltage as low as 2 Vppd using a packaged monolithic silicon DP in-phase quadrature modulator that employs a highly efficient vertical p-n junction rib-waveguide phase shifter.
W-band coherent radio-over-few-mode-fiber transmission system is presented, featuring an optical/wireless converged MIMO DSP. Power fading of radio signals incurred by mode coupling-induced crosstalk and its mitigation technique by the mode assignment and filtering are studied.
Anti-chromatic dispersion capability of the Tomlinson-Harashima precoding in optical PAM transmissions is investigated analytically and experimentally. The use of THP enables nearly two orders of magnitude BER performance improvement in a 30-Gbaud PAM-4 transmission over a 20-km SSMF.
Load balancing in a switch-fabric type of torus optical packet switching data center networks with hybrid optoelectronic routers shows the performance improvement such as packet dropping probability by decreasing the average number of hops.
We propose a scheme for pattern-free wavelength-conversion of PAM-signals in SOAs. By exploiting co-propagation of two complementary PAM signals in a saturated-SOA, the proposed scheme, in simulations, achieves 5-dB OSNR improvement with respect of XGM.
This paper presents the simultaneous transmission of millimeter-wave and terahertz-wave radio signals over an optical fiber and air by a single optical frequency comb source with several types of receiver configurations.
Coronary CT angiography (Coronary Computed Tomography Angiography) by MSCT (Multi-Slice Computed Tomography) offers not only a diagnostic capability matching that of CAG (Coronary Angiography) that is the gold standard of the cardiovascular diagnosis, but also a much less invasive examination. However, if calcified plaque adheres to a vessel wall, high brightness shading due to calcium in the calcified...
We show by simulation that the throughput and delay of applications that require zero losses in 5G metropolitan networks are greatly improved by replacing current electronic packet switching (EPS) networks with optical packet switching (OPS) networks with bufferless switches (no RAM, no fiber-delay-lines) that do not implement any kind of circuit-switching. The reason is that the total lack of queueuing...
A government-funded R and D program aiming at a resilient optical and millimeter-wave wireless link for a novel span protection scheme in a disaster recovery is presented. We also describe the key enabling technologies of both optical and wireless sub- systems and devices, including MIMO radio-over- fiber system, optical two-tone generation, and the transceiver and power amplifier in W-band.
300-GHz multilevel signal transmission over optical fibers and air is demonstrated using advanced optical communication technology including optical frequency comb generation. Local oscillator signal transport over optical fibers to optical-terahertz converters removes the need for setting any terahertz-capable oscillators in the converters. This fiber-remoted configuration with seamless conversion...
A DSP-aided transmitter-side crosstalk (XT) suppression technique for mode-unbundled transmission is proposed and demonstrated. The cooperatively-modulated OFDM subcarriers suppress the modal XT and enable the treatment of modes as individual channels without MIMO-DSP in a 30-km two-mode fiber link.
A novel optical multi-carrier packet format, which is tolerant of in-band-crosstalk in high-speed optical switches, is proposed and demonstrated experimentally by a 2×2 switching of 10-Gbaud coherent optical OFDM packets.
In OPS-based data center networks, setting up temporal OCS paths for high-reliability-required large data transmissions is preferred. However, inappropriate OCS path selection could severely affect the original OPS traffic, which is because OCS path may break the network topology and cause OPS packet circulations. We propose to hold bypassing routes for every link of the OCS path when it is established...
We demonstrated multiple-FDMA co-coexisted PON uplink transmission using the real-time ONU transmitter prototype. Flexible bandwidth assignment to multiplexed 3-ONU and the distance-adaptive capability is successfully indicated.
We analyze the throughput of fixed-length, variable-capacity (FL-VC) packet technology in OPS MANs with lengths up to several tens of kilometers. Compared to conventional OPS networks using fixed-bit-rate packets, FL-VC often offers throughput increases of ≃50% to TCP flows, and of ≃100% to UDP flows, under realistic traffic patterns. Throughput also increases with respect to equivalent topologies...
This paper proposes a novel virtual optical circuit switching (VOCS) scheme for data center networks where short flows are transmitted via optical packet switching (OPS), while long flows with reliability requirement are transmitted via VOCS. VOCS preserves the advantage of optical circuit switching (OCS) for reliable communication, while it overcomes the disadvantage of OCS in terms of low link utilization...
Mode division multiplexing (MDM) over wavelength division multiplexing (WDM) network is studied, particularly focusing on low differential mode group delay (DMGD) two-mode fiber (TMF) link in a wide spectral range. Here, the DMGD is defined as the group delay between the two guided modes, LP01 and LP11 modes. For the starter, We will revisit an invention of the original TMF in late 70's, followed...
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