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A pencil-beam steering phased-array based on optical-controlling scheme is proposed. FD-OP is used to gain flexibility and high tunablility. Experiments are conducted at 17 GHz to validate the 2D beams-steering ability of the system.
A novel photonic approach to the implementation of RF photonic phase shifter is proposed. It is based on a polarization dependent optical phase modulator and a dual-parallel Mach-Zehnder modulator. The phase shift of RF signal has a predefined linear relationship with the dc bias voltage of the optical phase modulator. This enables users to easily determine the control voltage needed to realize the...
Network Virtualization (NV) realizes the decoupling of network infrastructure and network services. With the emergence of the Software Defined Network (SDN), it is easier to implement NV supporting dynamic heterogeneous underlay network. In this paper, we present and experimentally validate an Optical Network Virtualization (ONV) architecture based on OpenVirteX (OVX) supporting bandwidth on demand...
Aiming at providing united control of multi-domain optical networks orchestration, we design the Federated Platform based on Open Network Operating System (ONOS). Our implementation includes adding and extending modules in ONOS to provide the global view of multi-domain networks and support cross-domain end-to-end services by communicating with the individual domain controllers through RESTCONF protocol...
We study the problem of dynamic content replacement in terms of network state variation in elastic optical datacenter networks. A dynamic content replacement scheme is proposed to minimize spectrum consumption, blocking probability and network latency.
High spectrum efficiency and flexibility are the advantages of elastic optical network, which is the future direction of optical network development. Routing and resource allocation is one of the core technologies of flexible optical networks. This paper propose an improved RSA algorithm in the elastic optical network which based on OSNR impairment model. It considers both QoT (quality of transmission)...
The flow aggregation scheme which aggregates a large number of finer-grained services into one large flow can save transceivers and improve spectrum efficiency. It ensures that all services in the aggregated flow have a same routing. Moreover, the spectrum allocated to all finer-grained services in the aggregated flow is continuous. Compared with independent transmission scheme which conducts the...
In this paper, we propose a light-tree based multicast flow aggregation (LT-MFA) scheme which can achieve the cost-efficient multicast service provisioning in elastic optical datacenter networks (EDONs). Moreover, a user-cover ratio based aggregation strategy is proposed for the LT-MFA scheme. An Integer Linear Program (ILP) model and a heuristic algorithm are developed to realize the LT-MFA scheme...
To improve the local accessibility performance, some important services are usually replicated and maintained in multiple datacenters. A user can request any datacenter which hosts the required service. The traditional end-to-end path is gradually replaced by the end-to-service path. To resist the frequently occurred natural disasters or human-made faults, survivability technologies need to be deployed...
In this paper, we develop two joint routing and resource allocation algorithms for stealth and ordinary services in optical networks. The transmission of stealth service needs to be hidden in ordinary services to achieve a better performance in privacy. Two heuristic algorithms construct paths for stealth and ordinary services base on the different routing methods. The proposed algorithms improve...
We study the problem of joint spectrum and storage resource backup (JSSRB) to improve the survivability of elastic optical datacenter networks (EODNs) for cloud services. An ILP model and heuristic algorithms are developed. Simulation results show that JSSRB can effectively improve the survivability and spectrum efficiency of EODNs.
To overcome the limitation of wavelength-dependent optical filter, we have experimentally demonstrated a bidirectional RoF system based on carrier polarization-suppressed DSB modulation. After transmitted over 10.5-km SMF, 0.3-dB power penalty is achieved for bidirectional links.
Optical steganography can realize the broadening of signal in the time domain through the group velocity dispersive, and transform the signal which needs to be protected into system-like noise hidden in the public service for transmission. Because of the random distribution of public and stealth services in the optical network, the establishment of end-to-end stealth channels often needs to connect...
We propose an inter-core crosstalk-aware routing, spectrum and core allocation scheme with spectrum bands and spatial Sp-Chs in multi-dimensional optical networks to get higher SE and lower XT. 15% reduction in XT is achieved.
Optical interconnection provisioning in Data Center (DC) draws lots of interests thanks to its high bandwidth and power efficiency. Optical TDM connection is an alternative solution to enable port sharing but with guaranteed bandwidth. At the same time, since the throughput of traffic in DC is fluctuating through time, it is quite critical to adjust the TDM slot allocation dynamically according to...
We propose a distributed sub-light-tree construction (DSLTC) scheme which uses multiple distributed sub-light-trees with different source datacenters to jointly serve one multicast request. DSLTC scheme achieves higher spectrum efficiency than the conventional sub-tree scheme.
An optical TDM system is experimentally demonstrated with sFlow based elephant flow detection and a DPDK based online timeslot allocator. With proposed timeslot allocation algorithm, allocator could have 383 Gbps throughput and continuous timeslots allocation.
We propose a survivable multipath routing and spectrum allocation with content connectivity scheme in OFDM-based elastic datacenter networks. This scheme achieves better performance in resource utilization compared with traditional protection schemes.
This paper addresses the RMLSA problem for end-to-content paths while satisfying k-node (edge) content connectivity requirement in elastic optical datacenter networks. Two distance-adaptive SWP-based RMLSA algorithms are proposed to improve the spectrum efficiency.
Disaster, natural or man-made, is the main threaten of survivability and reliability of networks. The development of content connectivity provides a new way of protection against disaster to ensure the reliability of network service/content. This paper focuses on shared backup path protection based on content connectivity against disaster in the context of elastic optical datacenter networks. In this...
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