All optical packet routing time wavelength division multiplexing passive optical network

Abstract

Time Wavelength Division Multiplexing (TWDM) Passive Optical Network (PON) is a combinati on of both Time Division Multiplexing (TOM) and Wave length-Division Multiplexing (WDM) technologies. The TWDM PON system can provide scalable and efficient wavelength management in WDM-PON network and at the same time can reduce numbers of aggregation node in metro network level. In this study, a new All-Optical Packet Routing (AOPR) TWDM PON system is designed to provide more flexibi lity of data delivery for each PON port and more bandwidth to each subscriber at multi ple PON Optical Distribution Network (ODN) link. By proposing broadcasting, multicasting, and multiplexing technique in downstream signal, the system is capable to support full degree of flexibility in managing efficient dynamic bandwidth allocation. To achieve flexible packet routing between multiple PON ports and multiple PON ODN links TWDM PON architecture, most of the proposed system used tunable transceiver in optical line terminal. This design wi II cause the attractiveness of the PON system, which is able to broadcast and multicast packet within the entire PON system limited only at single PON link. The proposed AOPR module was designed to incorporate fixed-type wavelength Optical Line Terminal (OLT) transmitter with Continuous Wave (CW) Pump Probe Signal (PPS) module. This design used high-speed wavelength selective switch (WSS) or ALL ON method to support high speed wavelength switching or all broadcast signal to replace a wavelength tunin g feature in tunable OLT transmitter . The proposed architecture has been designed using the multicasting cross-ga in modulation (XGM) method. In this proposed design. XGM function located in the OLT system becomes a part of the AOPR OLT transmitter. The arrangement of this design aims to generat e single or multiple wavelengths in a downstream direct ion in each OLT PON port. The system is designed and simulated using VPI photonic software followed by experimental verificat ion in the laboratory. This design showed the ability of the system to perform flexible packet routing function by using WSS method with 38 dB allowable link loss margin in the system at 10 Gbps at Bit Error Rate (BE R) of 10'.1. By using 16/,. 10Gbps downstream bandwidth can serve up to 2000 users at 20km. In regard to handling the broadcasting or multicasting flexible function with ALL ON method in the system, the result revealed that the proposed system can support 160Gbps broadcast downstream bandwidth to serve up to16 PON links using 16A. The proposed architecture shows this method will minimise an inventory issue and reduce point of error caused by different OLT PO ' port transmitter wavelength during system installation and maintenance. The proposed AOPR OLT module has high potential to be used in the future extended TWDM PON access network.