International Journal of Emerging Technologies in Engineering Research (IJETER) Volume 5, Issue 7, July (2017) www.ijeter.everscience.org Broadband Passive Optical Networks (BPON): A Review Baljinder Kaur1, Ramandeep Kaur2, Rajandeep Singh3 1, 2 Punjabi University, Patiala, India. 3 GNDU Regional Campus Sultanpur Lodhi, India. Abstract – Passive Optical Networks (PON) are significant In simple words, it can be said that PON is a network of fibers research interest at present for both the industry and the that only uses the fiber and various passive components such academia considering its successful deployment in the metro as combiners and splitters instead of using active components networks. The research is focused on enhancing the performance such as shaping circuits, and repeaters in the network. But the of the access segment of the passive optical networks. One of the main limitation of such network is the range of coverage which main purposes of any communication networks is to reach the end users who are situated far away. BPON (Broadband Passive is limited by the signal strength [2]. Optical Networks) have been evaluated in both upstream and Various telecommunication companies are using the PONs to downstream for their capability to reach the end users. Various provide numerous multimedia services such as Internet service, parameters as fiber length, the number of users, data rate, wavelength, coding techniques and Bit Error Rate (BER) are VoIP phone, and TV. Along with this, high data rate allows fast considered while evaluating the BPON networks. This paper video streaming. The network is very simple because of the provides an insight into the research that has already been done deployment of passive components that are small, cheaper and about the BPON networks. It includes a brief history of PON, its easy to replace. With the increase in demand for wide and faster types, BPON, architecture, applications and much more. The internet service, the PONs are also in high demand [8]. paper will assist the researchers to review the work that has been done in this field. 2. TYPES OF PASSIVE OPTICAL NETWORKS Index Terms – Broadband passive optical networks, Optical Line The Passive optical networks can be divided into different Terminal, Optical Network Units, PON. types according to the different generation. The PON types include the following: 1. INTRODUCTION A. Past generation PONs. Passive optical network abbreviated as PON is a system that helps to bring the optical fiber cabling as well as signals to the A PON and BPON are the types of passive optical network that way to the users. PON architecture consists of different was evolved in the 90s. APONs (Asynchronous Transfer Mode elements that include OLT (Optical Line Terminal), ONUs Optical networks) was the first system that accomplished huge (Optical Network Units), etc. OLT is located at the office of the deployment in the commercial areas. In this, an electronic layer communication company. On the other hand, various ONUs is built on the ATM (Asynchronous Transfer Mode). On the are located near the end users [1]. Approximately 64 ONUs can other hand, BPON is the enhanced sequence of the APON. be easily connected with one OLT PON port. The use of word BPON offer high data rate as compared to APON. It provides “passive” describes that the optical network does not require speed up to 622 Mb/s. The meantime also increased the any power and the active electronic part when signal start protection, dynamic bandwidth, and various other functions propagating through the network [3]. [9]. B. Current Generation PONs. EPON and GPON are referred as the current generations PONs. EPON (Ethernet Passive Optical Network) support transmission rate of 1.25 Gbit/s in one direction while using the IEEE 802.3ah protocol. On the other hand, GPON (Gigabit Passive Optical Network) support 2.5 Gbit/s while using the protocol specified in the ITU-T G. Thus, both the EPON and GPON are based upon the IEEE 802. 3ah and ITU-T G.984.x standards respectively. Therefore, GPON and EPON are the PON types that are being used at present. We are trying to increase the data rate through the next generation PON types Figure 1: Schematic of PON described in the upcoming section [4]. ISSN: 2454-6410 ©EverScience Publications 92 International Journal of Emerging Technologies in Engineering Research (IJETER) Volume 5, Issue 7, July (2017) www.ijeter.everscience.org C. Next-generation PONs Mb/s for upstream and downstream respectively to the customers [1]. Recently few recommendations were developed by the ITU-T standards development activity for providing definitions, As shown in Figure 1, a passive optical splitter is used between service requirement, consent, and specifications of PON the central office and the user sites. Due to the deployment of system that can transmit at the data rate of 10 Gigabit per the passive optical filter in the BPON the maintenance free second. Therefore, there are chances of the evolution of 10G operation is feasible. It is one the most cost effective way of PON, XG-PON 1 and XG-PON 2. There is the wide scope of communication among different PON types. communication in using the passive optical networks. WDM- PON (Wavelength Division Multiplexing-Passive Optical Networks) are also considered as the main base for the future PONs [12]. As this paper focus on the deployment of the broadband passive optical networks to serve a huge number of users, all the next sections would provide insight into the BOPN technology, its architecture, and applications. 3. BROADBAND PON BPON was the first PON standards which were agreed by the ITU in 1999. The complete working of the BPON standards is based on the G.983 series given in the ITU-T recommendations. ATM is signaling and transference protocol Figure 2: Broadband PON Architecture [1]. as described by the G983 series of ITU-T recommendations. 5. OPERATIONAL FEATURES OF BPON Previously, the access network that was based on the BPON standard were called APONs. The BPON standard was There are three major factors used in the BPON to accomplish endorsed by various component sellers and network suppliers service performance of high quality. These three essential that collaborated in the FSAN group. Simply, the fact is that it factors include the organization of the buffer content, proper was the FSAN group that suggested using the ATM protocol to synchronization of the upstream traffic and effective carry subscriber data [10]. bandwidth utilization. These three are the unique operational features of BPON. Broadband PON which is one of the past generation types of PON has the capability to support high data rate, high-speed A. Video Traffic voice, and video services to the end users at small businesses The transmission of the video relies on one component called as well as residential homes. Gigabit PON and Ethernet PON as a head-end transmitter. The main function of the head-end which are two other types of PONs also offer high data rate. transmitter is to receive content from different digital as well But the most beneficial factor about using the Broadband PON as analog sources [5]. The transmission system uses the same is the reduced cost. The cost of the maintenance between the standard that CATV utilize for distributing the video traffic to users and the central office is affordable [6]. the subscribers. The voice traffic can be easily transmitted There are numerous telecommunication services that are using using the same 1490 nm fiber as it uses different wavelength. the BPON to increase the FTTP (Fiber-to-the-premises) As a consequence, we can use any coding technique for the networks. It is because of the wide embedded switching video. It could be quadrature phase shift keying (QPSK), 64- structure of the carriers. The major benefits of using the ATM point quadrature amplitude modulation (QAM 64), 256-point networks include the flexible and scalable traffic management quadrature amplitude modulation (QAM 256), and others [11]. along with robust QoS (quality of services) features [13]. B. Data and Voice Traffic 4. BPON ARCHITECTURE The optical line terminal which is situated in the central office The Fig. 2. Represent the generic architecture of the Broadband is accountable for the complete interface between the users and Passive Optical Network. It is apparent from the figure that a the exchange carrier network. The information is transmitted to typical BPO architecture comprises maximum 20 km distance all ONTs by the optical line terminal in the form of ATM cells between the Optical Network Unit (ONU) and Optical Line utilizing the TDM (Time Division Multiplexing) structure. The Terminal (OLT). An architecture might consist of symmetric information which is transmitted by the OLT to the ONUs is in or asymmetric PON with a maximum of 622 Mb/s and 1.244 the form of data or voice which was received from the carrier network. There are total three options in the downstream ISSN: 2454-6410 ©EverScience Publications 93 International Journal of Emerging Technologies in Engineering Research (IJETER) Volume 5, Issue 7, July (2017) www.ijeter.everscience.org direction of the BPON networks which include 155.52, 622.08 the research focus on describing RSOS-based Colorless WDM- and 1244.16 Mb/s. PON. For this, the study proposed the cost-effective CW light source into the RSOA for 25 GB/s for the upstream in both 6. LITERATURE REVIEW WDM-PON and self-healing mechanism against the fault of S.F. Shaukat, U. Ibrahim and S. Nazir [1] presented the the fiber. At last, it was investigated about both downstream analysis of the Broadband Passive Optical Networks. BPONs and upstream traffic of 4 GB/s OFDM-QAM in the long-reach are used in industry and academia after the successful of TDM PON/WDM systems which are under the transmission development of the optical fiber in the metro networks because of 100km without the dispersion compensation.