Optical amplifier number and placement in the suiperPON architecture

Abstract

Abstract-Three alternative optically amplified long reach, wlde splitting ratio PON (SuperPON) amplifier placement strategies (i.e architectural configurations) are modelled using

Power-aware optimization modeling for cost-effective LRPON infrastructure deployment

“…An EDFA is in saturation if almost all Erbium ions are consumed for amplification, in which the total output power becomes distorted from the input power. To avoid saturation, a sufficient distance of at least 40 km is required when two OAs are in cascade [10]. As the number of cascaded amplifiers increases, such a constraint becomes more stringent.…”

“…For example, with four cascaded amplifiers, a minimum separation of 80 km is required. Therefore, in order to accommodate more ONUs while avoiding saturation, it is necessary to place a splitter between two stages of cascaded OAs each with a smaller gain [10].…”

“…For long fiber span where link loss or dispersion exceeds the receiver budgets, intermediate locations should be identified to place one or multiple OAs for signal amplification. For simplicity, the OA gain (g OA ) is assumed as a frequency independent constant of 20 dB [10], based on which the minimum number of OAs along an optical path can be obtained.…”

“…LRPON is positioned as a full-service optical access network characterized by high splitting ratio and OA on top of the conventional PONs [4]. Thus, research efforts on LRPONs have been extensively reported in various topics and directions, such as the cascaded splitter placement and layout in [5], the take-up-rate adaptive model for achieving better cost effectiveness [6], replacement COs by extended-boxes (EBs) for better energy efficiency [7], reach extension strategies and techniques [8], deployment strategies and protection mechanisms to achieve LRPON metro-access convergence [9], and the OA placement strategy in LRPON [10].…”

“…However, [5] studied cascaded splitter topology optimization of LRPON systems without taking account of optical power and noise complexity. [10] considered the use of OAs in PONs by performing a simulation study on the number of required OAs and placement strategy using the Virtual Photonic Integration (VPI) simulation package. It is apparent that the LRPON ODN topology design and dimensioning has never been fully discussed.…”