انتقال صدا، ویدئو و دیتا در شبکه های فیبر مرکزی (اف‌تی‌تی‌اچ) مورد استفاده OFDM

ABSTRACT Transmission of Voice, Video and Data in Fiber-To-The Home (FTTH) Networks Using OFDM

FTTH networks are undergoing an increasing deployment rate in the recent years due to its bandwidth advantage and network transparency. FTTH access networks support the delivery of converged wired/wireless services on the same fiber. Fiber-to-the- home (FTTH) access networks are currently experiencing double-digit growth in Europe, several Asian countries and the United States as residential customers pursue faster connections for broadband and expanded services like internet data, video streaming, file sharing and various flavors of TV, including 3D, and high definition video conference [1]- [3]. In this scenario, in order to reduce costs and complexity, the development of a next generation of FTTH (NG-FTTH) networks that report the convergence and integration of optical-fixed and radio frequency (RF)- wireless is critical and is in evolution [4]–[7]. Additionally, NG-FTTH networks must consider techniques permitting optical and wireless transmission impairments compensation and network management, only executed at the central node. This implies efficient network architectures which can handle the deployment of a large number of services with different requirements, and where coexistence of optical-wired and RF wireless paths should be properly guaranteed [8]. Two techniques are currently being explored to cope with the pronounced demands: optical modulation formats and implementation of cost-effective transmitters. From the modulation formats point of view, orthogonal frequency division multiplexing (OFDM) has been intended as a promising format to be used in NG-FTTH networks. In fact, one of the major advantages of this format is the fiber chromatic dispersion mitigation which has been specified as one of the major impairments enforced by the increasing distances required for NG-FTTH networks which are in the range from 20km to 100km and beyond [9]. OFDM radio signals seem to be an adequate choice for the distribution of RF-wireless applications in NG-FTTH networks [10]. The use of low-cost optical sources is critical in the development of NG-FTTH networks because the major investment of network terminal equipment is the cost associated with the transmitters at the optical network unit (ONU).