Transparent optical network (TON) is now rapidly booming to be popular, and a threat of an all-optical crosstalk attack with high power will emerge. In this paper, the penalty of crosstalk attack propagation, including intrachannel crosstalk inside the optical cross-connects, as well as direct and indirect interchannel crosstalk within fibers, is evaluated. Our work has proved that these crosstalk attacks do propagate in the TON but with limited propagation stages, which will be useful for the planning, management, and design of TON.
This paper measures and optimizes the network survivability based on average distance. A method is proposed to design
a network with constrained minimum average distance and to reduce the computation complexity based on adjacency
matrix. This paper studies the optimization of simple connected graph with arbitrary nodes and links under degree limit.
There may have several networks with minimum average distance in our method. So we choose the optimal network
from them by the network performance analysis under random failure.
Bandwidth-on-Demand (BoD) services are characteristic of dynamic bandwidth provisioning based on customers'
resource requirement, which will be a must for future networks. BoD services become possible with the development of
make-before-break, Virtual Concatenation (VCAT) and Link Capacity Adjustment Scheme (LCAS). In this paper, we
introduce BoD services into L1VPN, thus the resource assigned to a L1VPN can be gracefully adjusted at various
bandwidth granularities based on customers' requirement. And we propose a dynamic bandwidth adjustment scheme,
which is compromise between make-before-break and VCAT&LCAS and mainly based on the latter. The scheme
minimizes the number of distinct paths to support a connection between a source-destination pair, and uses make-beforebreak
technology for re-optimization.
Layer 1 VPN (L1VPN) extends the notion of VPN to the optical domain to provide virtually dedicated circuit like leased
lines, so that the security is more enhanced. Despite their secure gains from channel isolation, VPNs still suffer fragilities
resulting from link-failures or node-failures. Extensive activities on survivability designs for wavelength-routed optical
networks are proposed, including various protection and restoration schemes, but concerns on network edge are rare.
Dual-homing is an effective skill to achieve survivability gains for L1VPNs. There are two dual-homing mode:
Active/Standby mode and Load-Sharing mode In this paper, we investigate the problem of PE assignment, which is the
key of dual-homing design and is NP-hard. We formulate it as an integer programming problem, and propose heuristic
solutions. Simulation results show that the proposed solutions work in a correct and effective way and the Load-Sharing
mode has higher bandwidth efficiency than Active/Standby mode.
A ring based optical virtual private network (OVPN) employing contention sensing and avoidance is proposed to deliver
multiple-to-multiple group-multicast traffic. The network architecture is presented and its operation principles as well as
performance are investigated. The main contribution of this article is the presentation of an innovative group-multicast
capable OVPN architecture with technologies available today.
Generalized Multi-Protocol Label Switching (GMPLS) appears as a promising candidate to implement the control plane
for next-generation optical networks. In GMPLS-based wavelength division multiplexing (WDM) optical networks,
existing resource reservation protocol (RSVP) may fail to setup a multicast Label Switched Path (LSP) with high
probability, since multiple destinations in one multicast session may reserve different wavelengths and result in
reservation collision at branch nodes. In this work, we extend the existing GMPLS RSVP signaling protocol and propose
an efficient scheme to set up optical multicast LSP and avoid wavelength resources collision, called Last-hop Label Set
(LLS) scheme, by introducing a new object called Last-hop Label Set object in Resv message. Once the setup of a
multicast LSP fails caused by wavelength reservation collision at a branch node, the branch node can re-reserves a new
wavelength according to the Last-hop Label Set object within Resv messages. The numerical results indicate that the
proposed LLS scheme offers lower blocking probability compared to the existing GMPLS signaling scheme.