A study on network control method in Elastic Lambda Aggregation Network (EλAN)

Abstract

This article proposes a network control method that realizes on-demand service providing in Elastic Lambda Aggregation Network (EλAN). EλAN is a next-generation access/aggregation network that provides various network services having different protocols and QoS requirements. EλAN also achieves the reduction of total network power consumption by sharing access network equipment by multiple network services. In the proposed method, fixed optical trees are introduced to EλAN to exchange control messages in the same manner as today's FTTH systems. Discovery process and optical path/tree aggregation using the optical trees are explained in this article. We also discuss the energy-saving effect of the optical path/tree aggregation in EλAN.

Wide Dynamic Range Reception of TDM-Based DCO-OFDM Signals Using Optical Domain Power Equalization and Symmetrical Clipping Techniques

“…A more advanced concept that accommodates several access sections with a point-to-multipoint topology through a metro section with a ring or mesh topology where each remote node hosts some active devices (e.g., wavelength selective switch) has also been proposed [1]- [3]. Regardless of network configuration, different wavelength pairs (for downstream and upstream) are assigned to multiple services and they are transmitted over the same optical distribution network using wavelength division multiplexing (WDM) technologies [2], [3]. The OLT consists of several OLT ports and a multi/demultiplexer, and each OLT port transmits/receives a wavelength pair through the multi/demultiplexer, which means that an ONU cluster taking the same service communicates with one of the OLT ports.…”

“…To effectively accommodate all these services within a limited wavelength bandwidth, OFDM is a promising solution. Because OFDM offers adaptive bandwidth allocation by changing the number of subcarriers and multi-level format for modulating each subcarrier with the aid of DSPs, it can provide elastic bandwidth allocation depending on the services; it also offers scalable solutions to coverage areas [2] and efficient utilization of wavelength resources [3].…”

“…However, it is expected that future optical access systems will require additional advantages other than just increased bandwidth: multiple service accommodation [1]- [4] (e.g., residential, business, Machine-to-Machine (M2M), and mobile) and elastic bandwidth allocation depending on the services which offers scalable solutions to the coverage area [2], and efficient utilization of wavelength resources [3].…”

Virtual PON assignment for fixed-mobile convergent access-aggregation networks

“…Also, regarding the optimization model used in our study, similar models used for PON capacity assignment alredy exist, but they are applied to different networking problems [11], [12], [13].…”

Experimental evaluation of fault recovery methods in Elastic Lambda Aggregation Network

“…Logical OLTs (L-OLT) and ONUs (L-ONU) are configured within Programmable OLTs (P-OLT) and ONUs (P-ONU), respectively. The migration method of L-OLT between P-OLTs has been proposed to achieve more flexible utilization of P-OLTs [3,4,5,6]. When a failure occurs in a P-OLT or optical devices on an access path, connectivity of P-ONUs can be restored by migrating a L-OLT to another P-OLT and reconfiguring the access path.…”