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We propose and demonstrate a simple technique to generate 10-Gb/s QPSK signal by directly modulating an RSOA with instantaneous injection/depletion currents. No electronic equalization technique is needed to overcome the limited bandwidth of the RSOA.
The inter-domain QoS control employing a session-based resource management capability of next generation networks (NGN) is demonstrated for the first time. For a video-on-demand application, the extended resource and admission control function (RACF) is applied and the resource reservation over different NGN-domains is successfully conducted.
We demonstrate a simple beat interference cancellation approach enabling higher spectral efficiency and better sensitivity (> 2 dB) for DDO-OFDM. The associated benefits of enhanced phase noise and PMD tolerances, as well as the impacts of diverse filter parameters, are also discussed.
We propose and demonstrate the optical multiband receiving method which supports transmission of a 16-QAM, 213.7-Gb/s (189.7-Gb/s) DDO-OFDM super-channel over 720-km SSMF. After transmission all the 9 OFDM bands exhibit BERs lower than the FEC threshold (BER = 3.8e-3).
We demonstrate the first digital laser-phase-noise (PN) mitigation approach for DDO-OFDM which applies a simple Wiener filter for adaptively estimating the statistical-unknown PN. The PN tolerance, in terms of the achievable fibre length, is about tripled with this PN mitigation technique.
Design of an energy efficient wavelength division multiplexing (WDM) transponder is proposed and demonstrated. The WDM transponder interworking with the link-aggregation (LAG) technique possessed by a layer 2 switch (L2SW) can achieve power saving depending on traffic variations by utilizing an adaptive interface control.
Session-based QoS control mechanism is a key characteristic in next generation networks (NGN). However, the session-based QoS control defined in NGN standardizations is not designed for layer 2 infrastructures, but for border gateway function (BGF) at IP edge. To achieve QoS assurance for NGN services, end-to-end network resource management, including layer 2 access and metro networks, is required...
We discuss optical multi-band orthogonal frequency division multiplexing (OFDM) and show that by using multiple parallel OFDM bands, the required bandwidth of the digital-to-analogue/ analogue-to-digital converters and the required cyclic prefix can significantly be reduced. With the help of four OFDM bands and polarization division multiplexing (PDM) we report continuously detectable transmission...
During the last two years, numerous researchers have dedicated their work in optical OFDM and, consequently, the number of papers has grown exponentially. In this paper we evaluate the suitability of OFDM for long-haul 100GbE applications.
We discuss the use of multi-band OFDM for 120-Gb/s polarization division multiplexed orthogonal frequency division multiplexing (PDM-OFDM). Compared to single-band OFDM we show that a significant reduction in required DAC/ADC bandwidth is obtained at comparable computational complexity.
A pull operation-based network resource allocation architecture with application switching is proposed to apply QoS policy for non-SIP applications. Using the architecture, dynamic bandwidth allocation is successfully demonstrated for session-aware and non session-aware applications.
Polarization insensitivity of InAs/GaAs quantum dot optical amplifier has been demonstrated by controlling dot shape. This polarization insensitivity covers a bandwidth in excess of 40 nm.
We optimised the back-propagating noise suppression light (BPNSL) which improves the noise figure and power conversion efficiency of the L-band EDFA. The 1555 nm BPNSL was found to be most effective
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