RSOA IN OPTISYSTEM TV

Section 2 describes the working principle of AWG and gives a description of proposed network architecture. In this paper, we will make use of the above listed features of AWG in colorless WDM-PON network characterized by remodulation and try to establish seamless communication without any application of power amplifiers or dispersion compensation management. Finally, the simple implementation of technology of AWGs reduces network cost and complexity at the remote node (RN). An N Г— N AWG multiplexer is appealing in optical WDM networks because it is capable of increasing the aggregate transmission capacity of a single strand optical fiber. One more important benefit is that the AWG based MUX/DEMUX devices are linear phase filters and have intrinsically very small chromatic dispersion. Besides, these operate at high diffraction orders that lead to wavelength resolution of better than a nanometer despite their small overall size (of the order of centimeters). Other advantages of the AWGs are precisely controlled channel spacing (easily matched to the ITU grid) and simple and accurate wavelength stabilization. Since the insertion loss is independent of port count, these are appropriate for cost-sensitive WDM-PONs. AWGs have a very low insertion loss (3 to 4 dB), good crosstalk levels (30 to 35 dB), high fiber-coupling efficiency, and polarization independence. Several arrayed waveguide gratings (AWGs)-based WDM-PON architectures have been recommended in the recent past.

Researches have suggested colorless operation within customer premises equipment (CPE) to reduce both CapEx and OpEx. The most critical issue in the implementation of practical WDM-PON networks is the realization of low cost transmitters at subscriber ends. Also the high cost involved in wavelength selective components and wavelength specific transmitters at both the optical line termination (OLT) and within each optical network unit (ONU) has reduced the competitiveness of this technology in the current optical transport market. Though these are considered as popular solutions that will revolutionize the access network but the cost of initial deployment and maintenance due to a number of wavelength specific light sources is a deterring factor. These can serve distances up to 80-100 km without the need for optical amplification. These can offer many benefits such as large capacity, reduced optical path loss, channel independence, format transparency, network security and scalability (the number of channels that can be easily upgraded) and flexibility (several types of channels transmitted at different wavelength that can coexist on the same time).

On the other hand, wavelength division multiplexing passive optical networks (WDM-PONs) have emerged as alternative technology for fulfilling future requirements in the access network. However, TDMA PONs have limitations of bandwidth, cost and link reach. These have been widely accepted as the current-generation optical access solutions. Many operators are using EPON and GPON based on TDMA for provisioning of baseband services. Also these are capable of providing higher bandwidth for broadband subscribers and can offer data rates of upto few Gbps (EPONS, GPONS) or point to point (P2P) or point-to-multipoint (P2MP) links according to Ethernet. The rapid deployment of optical fiber is underway at present and passive optical networks (PONs) are replacing existing copper based access systems because of their low cost and simple operation and maintenance. These services will put immense pressures on carriers to come up with both innovative and inexpensive solutions regarding higher aggregate bandwidth, service provisioning and long link reach. Keeping this trend in sight, one may estimate that users will require more than 30 Mbps of guaranteed bandwidth per user in the near future.

RSOA IN OPTISYSTEM TV

Video on demand (VoD), multimedia broadcasting, videoconferencing, online user generated video content, high-definition TV (HDTV), e-learning, interactive games, voice over IP, and many other broadband services are increasing at exponential rate in access network.

Rsoa in optisystem