Optical Networks

The increasing use of fibers for DWDM and very high transmission speeds has sparked interest in certain fiber properties that were irrelevant in the past.

In 1998, a significant innovation in fiber optics appeared on the networking scene. This technology, known as SFF (Small Form Factor Fiber), brings fiber optic connectivity to LANs with system port densities twice those found in existing fiber optic network components.

Radio communication systems over fiber optics in the millimeter wave frequency band are not yet highly developed, largely due to the difficulty of obtaining suitable optoelectronic devices. However, such systems have significant applications due to several advantages they offer, including operating at high frequencies, smaller antenna sizes, greater available bandwidth, less regulation, and greater atmospheric absorption, which allows for frequency reuse in cellular systems.

The QCA8829 chip from Qualcomm Atheros Inc., the network management and connectivity subsidiary of Qualcomm Incorporated, is an industry-leading, most integrated, and lowest-power 1 Gigabit (1G) Ethernet passive optical network (EPON) solution. The chip has been optimized to enable next-generation optical broadband access in homes and businesses.

When Heathrow's Terminal 5 opened amid delays and baggage handling problems that were broadcast worldwide on TV news, the following statement might not have immediately come to mind: "One of the most outstanding engineering milestones of the 21st century, with innovative computer and engineering solutions at the forefront of development.".

The transmission networks that now extend across much of the world allow us to communicate and exchange all kinds of information between any point on the globe. In recent decades, the demand for communication services has increased, both in homes and businesses. End users increasingly require high-speed, high-bandwidth internet access, file transfer, video and multimedia services, high-definition online gaming, cable TV, and more.

The Principality of Andorra and its FTTH rollout demonstrate what can be achieved in the short term with sound vision and the right level of commitment. This mountainous country, with a population of only 75,000, but lacking the economies of scale of one of the world's largest economies, has become a model of fiber optic access for the rest of Europe.

At the northernmost tip of the Pyrenees lies the city of Pau, capital of the Pyrénées-Atlantiques department of France. Together with 13 other neighboring municipalities, it forms the Communauté d'Agglomération of Pau-Pyrénées.

Infinera has announced that Retegal, the telecommunications network operator of the Xunta de Galicia, has deployed Infinera's metropolitan WDM transport ATN platform, thus enhancing the regional network that provides its services throughout Galicia.

Ciena Corporation launches its OneControl Management System, which unifies visibility and control of optical, OTN, and packet services, from the Access Network to the Backbone Network. Designed to evolve from Ciena's existing management platforms, OneControl helps protect and extend customer investments. It offers multi-layered intelligence supporting a variety of capabilities, from wavelength reconfiguration at Layer 0 to monitoring and reporting on service-level agreements at Layer 2, all through a single user interface. OneControl also includes a fully customizable management display that provides a comprehensive overview of the status of all network capabilities and services.

Ciena Corporation states that mesh optical networks are the solution to fiber optic cable breaks, thus eliminating the challenge posed by cable resistance to wear and tear or external damage. Mesh technology allows the network to automatically reconfigure itself to prevent service interruptions without manual intervention, and can handle multiple simultaneous failures.

Citynet launched the first phase of its network deployment in Castellón in the middle of this year. This phase comprises 18 km of fiber optic cable. This comprehensive service is ideal for connecting all types of facilities in various locations (municipal buildings, telephone exchanges, operator points of presence, electrical substations, mobile and cable operators, etc.)

OCDMA is a clear example of the extrapolation to the optical domain of a technology widely used in current wireless systems. Specifically, we will analyze its ability to increase bandwidth and improve the privacy of communications in local area networks over fiber optics.

FTTH/B network deployments must provide physical layer flexibility to enable easy and rapid network monitoring, maintenance, and expansion. Traditional fusion splicing technologies offer lower initial installation costs, but are being gradually replaced by advanced connectorization systems. These systems optimize installation and operating costs while ensuring long-term network flexibility, thus guaranteeing growth and robustness.

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