IEEE/OSA Journal of Optical Communications and Networking

We consider the traffic grooming problem, a fundamental network design problem in optical networks. We review a typical integer linear program formulation considered in the literature, and we identify two challenges related to this formulation in terms of scalability and wavelength fragmentation. We then propose a new (to our knowledge) solution approach that decomposes the traffic grooming proble... View full abstract»

Recently, optical orthogonal frequency-division multiplexing technology has attracted intensive research interest because spectrum-sliced elastic optical networks (EONs) can be constructed based on it. In this paper, we investigate how to serve multicast requests over EONs with multicast-capable routing, modulation level, and spectrum assignment (RMSA). Both EON planning with static multicast traf... View full abstract»

Design tools for the quintuple-play service provisioning in a long-reach passive optical network (LR-PON) using off-the-shelf directly modulated lasers (DMLs) are experimentally demonstrated. The quintuple-play service including broadband wired Internet, phone/voice data, wireless high-definition TV, wireless data, and home security/control is provided by a radio-over-fiber bundle of multi-format ... View full abstract»

Currently, the concept of greening the Internet is emerging with the increasingly acute energy crisis. Reducing the power consumption in IP over wavelength-division multiplexing (WDM) optical networks is of great significance. From the perspective of traffic engineering, green grooming has performed well in terms of power savings. However, in a more realistic network, some traffic characteristics ... View full abstract»

With the rising popularity of multicast applications, various algorithms using either lightpath or light-tree schemes have been proposed for dynamic multicast traffic grooming in meshed wavelength division multiplexing (WDM) networks. To the best of our knowledge, however, no systematic comparison has ever been made between the performance of the two schemes in minimizing network blocking probabil... View full abstract»

We propose a novel scheme based on asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) for upstream transmission in next-generation passive optical networks, which features low power consumption, colorlessness, and cost effectiveness. An experiment with 5 Gbits/s ACO-OFDM upstream transmission has been carried out to investigate its performance. Meanwhile, a 2-ONU ... View full abstract»

Free-space optical (FSO) communication provides rapidly deployable, dynamic communication links that are capable of very high data rates compared with those of radio-frequency systems. As such, FSO communication is ideal for mobile platforms, for platforms that require the additional security afforded by the narrow divergence of a laser beam, and for systems that must be deployed in a relatively s... View full abstract»

In this paper, we investigate the outage performance of free-space optical mesh networks, which build upon the combination of serial (multi-hop) and parallel relaying. We assume log-normal atmospheric turbulence channels and derive outage probability expressions for the multi-hop parallel relaying scheme under consideration. Our outage probability analysis demonstrates substantial performance impr... View full abstract»

Stackable reconfigurable optical add-drop multiplexers (S-ROADMs) have been proposed for single-fiber coarse wavelength division multiplexing (CWDM) ring networks so as to perform lightpath reconfiguration remotely. The S-ROADM consists of some modules with different wavelengths required in the node, and with this facility manual ROADM reconfiguration can be performed for low-cost transmission sys... View full abstract»

The recent development of new applications and services, primarily multimedia applications, has driven the need for higher bandwidth and a faster access network, but these cannot be fully realized with the conventional single-channel Ethernet passive optical network (EPON). In such circumstances, the realization of WDM EPONs is the best solution for the implementation of converged triple-play netw... View full abstract»