Nishaanthan Nadarajah | University of Melbourne (original) (raw)

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Papers by Nishaanthan Nadarajah

45th European Conference on Optical Communication (ECOC 2019), 2019

COIN/ACOFT 2003: Optical Networking: Technologies, Traffic Engineering and Management, 2003

We review recent progress on all-optical virtualprivate-network (VPN) schemes in passive optical ... more We review recent progress on all-optical virtualprivate-network (VPN) schemes in passive optical networks (PONs). PON is a promising candidate in future access areas to provide broadband services with low cost. With all-optical virtual private network (VPN) function, PON can support efficient internetworking among end users with dedicated optical channels, thus enabling guaranteed bandwidth and enhanced security at the physical layer. Here, we discuss and compare existing schemes of all-optical VPNs in time-division-multiplexed (TDM) PONs, and also recently proposed schemes for deployment in wavelength-division-multiplexed (WDM) PONs and two-stage TDM/WDM PONs. OLT

IEEE Photonics Technology Letters

33rd European Conference and Exhibition on Optical Communication - ECOC 2007, 2007

ABSTRACT A simpler and bandwidth efficient scheme for providing local area networking amongst the... more ABSTRACT A simpler and bandwidth efficient scheme for providing local area networking amongst the customers in a multi functional repeater-based optical access network is proposed and experimentally demonstrated.

ABSTRACT A theoretical scalability analysis for electronic code division multiple access based vi... more ABSTRACT A theoretical scalability analysis for electronic code division multiple access based virtual private networks over a passive optical network is carried out to identify the performance limits of the scheme.

ABSTRACT In this paper, we present the experimental investigation of the use of electronic code d... more ABSTRACT In this paper, we present the experimental investigation of the use of electronic code division multiple access technique to achieve multiple secure virtual private networks over passive optical network architecture. We also discuss the scalability of this technique using analytical modelling.

Optical fibre communication is very much preferred for the communication of signals over bandwidt... more Optical fibre communication is very much preferred for the communication of signals over bandwidth of a gigabits per second over distances more than hundreds of kilometres. For a long period of time optical fibre communication has been about how to provide higher bandwidths with reduced cost per bit transmitted. However, this trend has changed from optical transmission to optical networking. By exploiting the wavelength division multiplexing (WDM) technology, optical networks have expanded from backbone networks to metropolitan and access networks to deliver high bandwidth services to the users in a seamless fashion with reduced cost. The ultimate evolution of the optical access network involves fibre-to-the-home (FTTH) technologies, which can potentially offer every kind of information and communication related services. Out of all FTTH technologies, the passive optical network (PON) can potentially offer the most cost-effective solution as the optical network is shared between a n...

OECC/ACOFT 2008 - Joint Conference of the Opto-Electronics and Communications Conference and the Australian Conference on Optical Fibre Technology, 2008

ABSTRACT We investigate the complex interactions between sidebands for baseband DSB coherent opti... more ABSTRACT We investigate the complex interactions between sidebands for baseband DSB coherent optical OFDM systems and propose the use of SSB coherent OFDM to avoid sideband interaction in dispersive fibre.

2009 14th OptoElectronics and Communications Conference, 2009

ABSTRACT We propose and experimentally demonstrate an in-service surveillance scheme for passive ... more ABSTRACT We propose and experimentally demonstrate an in-service surveillance scheme for passive optical networks using electronic code division multiple access. We show that this technique can be used to monitor users with minimal penalty for upstream-data.

Optics Communications, 2008

ABSTRACT We propose and experimentally demonstrate the feasibility of a control packet signaling ... more ABSTRACT We propose and experimentally demonstrate the feasibility of a control packet signaling technique using electronic code division multiple access for a wavelength division multiplexing packet-based network, whereby each wavelength channel is assigned a unique electronic code based label on a radio frequency subcarrier. Such a technique allows each wavelength channel to be electronically identified without requiring the use of a WDM demultiplexer. We experimentally demonstrate this technique with two wavelength channels each with 1.25 Gb/s baseband payload data and 10 Mb/s header coded onto an electronic code at 160 Mb/s. A performance study of the electronic code division multiple access based control signaling scheme in a wavelength division multiplexed packet-based access network is also performed in terms of the required power budget to monitor the electronic code division multiple access control signals in the presence of several sources of noise for error-free transmission of both payload data and electronic code division multiple access based control signals. It is shown that the modulation depth of each signal impacts the amount of required optical tap power. As the modulation depth of the electronic code division multiple access based control signal is increased, the required optical tap power is reduced. However, this increases the bit-error-rate for the payload data. Therefore, there lies a maximum and a minimum of the required tap optical power for the successful recovery of both signals. The lower bound of this range is usually determined by the successful recovery of electronic code division multiple access based control signal while the upper bound is determined by the successful recovery of payload data. The required optical tap power is analyzed for different transmission bit rates of the payload data for various receiver architecture scenarios without an optical amplifier at the receiver. The scalability analyses were repeated with an optical amplifier placed in the receiver terminal of the network. The resulting optical tap power that is required for the successful monitoring of the electronic code division multiple access based control signals are compared with that of the case without the amplifier.

Advances in Lasers and Electro Optics, 2010

We propose and experimentally verify a scheme for fast automatic protection switching and custome... more We propose and experimentally verify a scheme for fast automatic protection switching and customer networking in an Ethernet passive optical network by redirecting the upstream signals back to the customers using a secondary distribution fibre.

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013, 2013

ABSTRACT We discuss the commercial context and technical requirements to 100G coherent interfaces... more ABSTRACT We discuss the commercial context and technical requirements to 100G coherent interfaces and illustrate ASIC design decisions and challenges, looking beyond 100G as well.

ABSTRACT A DGD monitoring technique using a low-speed detector for 40Gb/s-RZ data is experimental... more ABSTRACT A DGD monitoring technique using a low-speed detector for 40Gb/s-RZ data is experimentally demonstrated. RF power increment of 18dB, which is insensitive to CD and OSNR, is measured in the DGD range from 0 to 25ps