We show the application of closed-form expressions for nonlinear transmission performance of coherent optical OFDM
systems with frequency guard band. The dependences of their performances on system parameters are investigated and
new findings on the influence of dispersion compensation configuration and guard band are observed. The advantage of
using closed-form expressions is that the performance for various system configurations can be identified without
resorting to sophisticated numerical simulations.
We demonstrate transmission of 1.0-Tb/s unique-word DFT-spread OFDM signal over 8000-km SSMF with 80-km span
length and EDFA-only amplification, representing a record spectral efficiency and reach product compatible with most
of the deployed links.
In this paper, we first provide analysis and discussion on the optimal symbol rate for long-haul
transmission. In particular, the optimal subband bandwidth in a multi-band DFT-Spread OFDM
(MB-DFT-S OFDM) system is studied. We then carry out numerical simulation of 107 Gb/s MB-DFT-S
OFDM systems and find the optimal subband bandwidth is 3.5 GHz for dispersion un-compensated
systems. We finally show experimental demonstration of the nonlinearity improvement of
DFT-S-OFDM over conventional OFDM systems.
In this paper, a dynamic impairment-aware routing and wavelength assignment (RWA) algorithm is proposed to
efficiently provide signal-quality-guaranteed connections and achieve lower blocking probability in all-optical wavelength
division multiplexing (WDM) network with high speed optical channel. In the all-optical network, optical connection is
set up to carry data signal from source node to destination node without optical-electrical-optical (OEO) conversion via
all-optical lightpath. During the travel, the signal transmitted along the lightpath must pass through a number of optical
components, such as optical amplifiers, optical crossconnect switches (OXCs) and fiber segments. While the optical signal
propagates to the destination, the impairment would accumulate along the all-optical lightpath with these components,
which makes the quality of signal degrade continuously. When the impairment accumulation comes to a serious degree,
the bit-error rate (BER) would be too high to be acceptable in the destination receiver, the good quality of service for a
connection request could not be provided in physical layer and the connect request would be rejected in control plane
because of impairment accumulation. Therefore new techniques in both physical layer and network layer are necessary for
decrease the influence of impairment accumulation. Here we investigate a new dynamic RWA algorithm to lower
blocking probability of connection. By jointly consideration of both available wavelength and wavelength dependent
impairments, the routing weight functions can be dynamically updated to accommodate between wavelength blocking and
physical layer blocking. Simulation results indicate that the proposed algorithm can achieve lower blocking probability.
In WDM networks, when a session request is received by the network, the problem of establishing light-paths by
routing and assigning a wavelength to this connection session is called the Routing and Wavelength Assignment (RWA)
problem. The selection of routing algorithm and wavelength assignment method is the key point to solve this problem.
And the flooding technique is always used for those routing algorithms to get the resource status and topology
information. In this paper, we propose a novel routing algorithm, Rank Total wavelengths and Available wavelengths
(RTAW), which dramatically reduces the flooding frequency while guaranteeing a low blocking rate. Compared with
other algorithms, the simulations results prove the benefits of this algorithm.
Transparent optical WDM networks have been expected to be the most effective solution to achieve high throughput transmission, in which a GMPLS control plane is used to manage both IP layer and the optical transport layer. However, current GMPLS does not take the influence of physical impairments during data transmission process into account. This paper proposes a signaling-based approach to implement self-adaptive transmission control (SATC) in impairment-aware transparent WDM networks. The function of standard control plane of automatic switched optical network is enhanced to realize this aim. Two evaluation schemes are proposed for the implementation of this approach. Simulations are conducted for proof of benefits gained by introducing SATC.
This paper investigates the efficiency of deploying distributed dynamic routing with different adaptive weight functions
using the GMPLS control plane in optical transport networks. Improved TAW function is presented. The limitations of
employing adaptive weight functions are also validated compared to direct routing.
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