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A novel silicon photonics filter enabling single-channel-extraction over a wavelength range wider than the telecom C-band is proposed. An extraction bandwidth of only 15 GHz is demonstrated with off-band rejection of more than 15 dB.
Silicon photonic interconnects have been proposed as a solution to address chip I/O communication bottlenecks in multicore architectures. In this paper, we perform comprehensive design exploration of inter-chip photonic links and networking architectures. Because the energy efficiencies of such architectures have been shown to be highly sensitive to link utilization, our design exploration covers...
In the mixed-line-rate (MLR) wavelength-division multiplexing (WDM) networks, each wavelength of fiber can provide different bandwidths (in 10/40/100 Gbps) by using different modulation types. Since the MLR-WDM technique is becoming the key and a cost-efficiency technique for the network upgrading, the problem for supporting virtual topology reconfiguration (VTR) becomes a very important issue. In...
All-optical Nyquist filtering allows generation of coarse-granular, flexible, spectrally-efficient signals. This talk reviews important technologies for applications of Nyquist OTDM-WDM to elastic optical network including transmission, add/drop operations, spectral defragmentation.
In this paper, we demonstrate that directly modulated InP short-cavity single-mode VCSEL arrays emitting at 1.55 μm are suitable optical transmitters for metro network applications. We show 400-Gb/s transmission over 400-km standard single mode fiber using a wavelength-division-multiplexed and polarization-division-multiplexed 4-level pulse-amplitude-modulated (4PAM) monolithic VCSEL array, enabled...
Flexible PON are future paradigm in parallel with flexible and elastic optical networks are under research for core networks. In the same way as those backbone optical networks can be significantly improved by following software-defined network (SDN) techniques, it is described how SDN PONs can be implemented by highly spectral efficient digital modulation formats. A main challenge is the implementation...
The introduction of optical transport network (OTN) switching technology enables an efficient wavelength bandwidth utilization and reduces the number of wavelengths, leading to reduced network costs. It has been shown that the use of integrated OTN/WDM switch architecture is cost effective because it reduces the number of short-reach client interfaces. The OTN/WDM also reduces the rack space and the...
In elastic optical networks, the lightpaths setup and tear down processes may cause the so-called spectrum fragmentation issue, degrading spectrum utilization, increasing lightpath rejection ratio, and this is especially critical under dynamic traffic scenarios. In this letter, we first theoretically analyze the lightpath rejection ratio in elastic optical networks and reveal the relationship between...
Future generations of PON networks are likely to extend the capabilities of current TDM solutions or apply WDM technology to further increase the exploited optical bandwidth. In this paper we estimate the equipment cost difference between WDM and TDM-PONs, modeling the expected short- and mid-term changes in hardware costs, in order to find the breakeven point of TDM and WDM cost with respect to per...
Passive Optical Networks (PONs) constitute a predominant point-to-multipoint architectures for an efficient and cost-effective fiber-based broadband access. We have analyzed several PON configurations, which either have been already standardized, like Wavelength Division Multiplexing — Time Division Multiplexing (WDM-TDM) PONs, or are highly promising PON technologies, like Optical Code Division Multiple...
Hybrid Wavelength-Time Division Multiplexing (WDM-TDM) Passive Optical Networks (PONs) become strong candidates for Next Generation PONs and, therefore, merit deep performance evaluation. In this paper, we concentrate on the performance of a Dynamic Wavelength Allocation (DWA) protocol, under multi-dimensional traffic which is modeled by a Pareto ON-OFF model; it resembles the bursty nature of traffic...
A multi-tap microwave photonic filter (MPF) with its center frequency tuned by a single parameter is proposed and demonstrated based on polarization modulation. By simply adjusting the amplitude of a sawtooth wave signal to a polarization modulator, the MPF is tuned with the shape and the free spectral range (FSR) unchanged. The proposed system has advantages in terms of simple operation, fast tunability...
Optical networks are subject to faults in links and nodes which can cause massive data loss. In the literature, many techniques have been proposed to deal with such failures in order to support continuous network operation. One of these techniques defines p-Cycles which provide ring-type protection and the speed of restoration of meshes. Morever, Flex grid networks emerged as a solution to deal with...
Elastic Optical Networks has drawn a lot of attention in the past few years because of its ability to transmit different data rates increasing or decreasing the optical spectrum according to the necessary demand, ensuring a high spectral efficiency. However, establishing and tearing down different connections ends up segmenting the spectrum in several small fragments, making it impossible for new...
Fiber to the Home (FTTH) is broadly acknowledged as the optimal solution for meeting the current and future broadband requirements. FTTH involves the installation of optical fiber network from a central service provider to individual users. An innovative technology for FTTH implementation is Passive Optical Network (PON), which provides unprecedented bandwidth. The attributes of modern passive optical...
In Wavelength Division Multiplexing (WDM) optical networks, the failure of network resources (e.g., fiber link or node) can disrupt the transmission of information to several destination nodes on a light-tree based multicast sessions. Thus, it is essential to protect multicast sessions by reserving resources along back-up trees. So that if primary tree fails to transmit the information back-up tree...
In this paper, we propose a novel protection architecture of passive optical network (PON) system. Two optical line terminals (OLTs) are connected to each other as well as to the access area. This network can sustain services to access area and restores normal operation in faulty conditions. Subscribers are divided into two groups to reflect priority based bandwidth allocation. WDM access increases...
Recent trends in transmission technologies focus on bit rates higher than the state-of-the-art DP-QPSK (Dual Polarization - Quadrature Phase Shift Keying) 100 Gbit/s transmission. High spectral efficiency formats and multi-carrier channels are currently under study. In particular coherent 400 Gbit/s and 1Tbit/s channels are becoming technologically feasible. However, economic viability is a key point...
Network emulation has been one of the tools of choice for conducting experiments on commodity hardware. In the absence of an easy to use optical network test-bed, researchers can significantly benefit from the availability of a flexible/programmable optical network emulation platform. Exploiting the lightweight system virtualization, which is recently supported in modern operating systems, in this...
Novel hybrid PON architectures are demonstrated to provide multi-grained bandwidth allocation (MGBA), flexible service, and channel fault monitoring feature. It can be applied to construct energy-efficient broadband access that supports both fixed/mobile backhaul and fronthaul.
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