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The elastic optical network can improve spectrum utilization because it allocates an appropriate number of continuous and partially overlapped subcarriers according to each traffic demand. In this paper, we study path protection under an adaptive modulation with the consideration of spectrum defragmentation and energy consumption.
We report a measurement of effective refractive index of a nematic liquid crystal Fabry-Perot etalon according to the applied static electric field intensity. The effective refractive index decreases from 1.67 to 1.51 as the applied electric field intensity is increased.
Cloud rendering consolidates heterogeneous server resources into a renderfarm. A high-speed optical interconnection is also required between user and renderfarm. So we need a cloud convergence of Optical and Data Center Network (ODCN). Considering cloud rendering features, we build a mapping-cost-aware renderfarm by heuristics.
Network virtualization has been regarded as a candidate solution for providing cloud network services. VLAN has been the most common approach for providing isolated logical network but with a well-known scalability issue. Both the Industry and the Academia carried out promising network virtualization solutions to address the problem. However, upgrading the virtualization technology makes data center...
In this paper, we investigate the required range of ONU transmit power levelling for TWDM-PONs based on the worst case inter-channel crosstalk analysis. To overcome the crosstalk impairment, an OLT-shared architecture of the ONU transmit power levelling and its operation rule is also proposed.
Since data center carries plentiful applications, its failure results in huge data loss. In order to mitigate service's paralysis caused by data center failure, we propose a flexible data center backup framework through highly efficient virtual machine migration and grading along with elastic bandwidth allocation.
Visible light communication (VLC) has won much attention in recent years. In this work a visible light communication system based on IEEE 802.3 standard Media Access Control (MAC) layer is presented. The digital signal processing module of the physical (PHY) layer is implemented in FPGA (Field Programmable Gate Array). The PHY layer is connected to the MAC layer via a Media Independent Interface (MII)...
We investigated analog optical transmission performance degradation caused by nonlinear distortion by varying several operating conditions including the number of IF carrier, IF channel spacing, modulation index and transmission distance for future-proof cost-effective next generation mobile fronthaul architectures based on intermediate frequency over fiber (IFoF) technique.
An InP-based fiber-coupling structure in which additional waveguide is overlaid on deep-ridge main waveguide is proposed with design and fabrication results. It is a feature of the structure that both the overlying and main waveguides participate in the fiber coupling.
We have produced angle at the end face of optical fibers. Repetitive experiment result illustrates its reliable and stable production of the 8 degree angle. Comparing the beam profile of regular and angled optical fibers, we confirm the focusing of beam attributed to curvature of the angled optical fiber.
Generally in real implementation of OFDM system, the simple and fast LS channel estimation method has been used for the wireless channel in the OFDM systems. If the wireless channel environment were mixed with RoF (Radio Over Fiber) channel, could we still use the conventional least square (LS) channel estimation method for proper communication? Therefore, in this paper, we analyzed that the performance...
We experimentally investigate the optical signal-to-noise ratio penalty induced by the rotational misalignment of the phase plates in phase-plate based mode multiplexer.
Due to the high spectrum efficiency and the flexible resource allocation, Orthogonal Frequency Division Multiplexing Passive Optical Network (OFDM-PON) support heterogeneous access techniques but it will face many challenges. Thus in this paper, we review and discuss some challenging issues about the OFDM-PON supporting heterogeneous access techniques.
This paper discusses the P2MP in band OAM framework primarily related to OAM and related management in MPLS-TP networks. The P2MP network MPLS-TP data transfer scheme from the root node to the leaf nodes of the In-band OAM because it supports, MPLS-TP OAM 50ms time, one of the requirements in the OAM packet can be processed.
The unified control of core / metro / access networks using Software-Defined Networking (SDN) is effective for providing services flexibly. In this paper, experimental results of the unified control by hierarchized Controller utilizing OpenFlow protocol and abstracted network are presented.
In this paper, we present a path computation element (PCE) based provisioning controller coupled with a OpenFlow (OF) controller for software-defined transport networking (SDTN). The main concept of the proposed approach is a unified provisioning controller based on a PCE that enables fast and error-free methods for path computation, provisioning, and configuration in SDTNs. The coordinating work...
The use of the fiber mode selective coupler (MSC) for mode multiplexing and demultiplexing is investigated. The signals in two separate modes excited by the MSCs are successfully recovered by 4×4 MIMO signal processing.
In this paper, we present a cognitive routing and wavelength assignment (RWA) algorithm for dynamic optical networks, named CRWA algorithm. Different from the traditional RWA algorithm, a cognitive model derived from the Case-Based Reasoning (CBR) is introduced into the proposed algorithm to reduce computing complexity. Simulation results show that the computational time of CRWA is reduced about 25%...
We propose and experimentally demonstrate a novel low-biased intensity-modulated directly-detected (IM-DD) analog photonic link with suppressed relative intensity noise (RIN) and second-order harmonic distortions (SHD) for multi-octave span RF signal delivery. Experiment results show 19 dB suppression of the SHD, compared with the traditional low-biased IM-DD link.
We review trans-oceanic-class multi-core fiber transmission systems with Super-Nyquist-WDM technique, in which optical signals are multiplexed with frequency spacing of less than baudrate. The capacity-distance product over 1 Exabit/s·km has been achieved.
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