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In this work we propose and experimentally demonstrate a photonics-assisted microwave spectral scanning system that realizes high-speed sweep over ultra-broad bandwidth. Enabled by coherent dual electro-optical frequency combs and a recirculating optical frequency shifter, the proof-of-concept experimental setup covers the frequency range from ∼ 1 to 8 GHz with 1.2 MHz spectral resolution within 14...
The dense wavelength division multiplexed system operating near zero dispersion region and at low channel powers is much affected by the four-wave mixing (FWM). In this paper, a novel sub-optimum four-wave mixing minimization method is presented. The distinct feature of the method is that it selectively minimizes the four-wave mixing and enhances performance and spectral bandwidth efficiency in a...
Requirement for high bandwidth internet traffic is growing rapidly now-a-days. Utilization of the available resources becomes troublesome due to rise in the number of users. So it is important to provide the resources efficiently. To solve the problem of resource provisioning, many developments have been made by the researchers. During working hours, the scheduled traffic is huge and sluggish during...
An echelle diffraction grating (de)multiplexer with arc-shaped grating teeth, based on a multi-guide vertical integration platform in InP is presented. The device can be applied to the 100GBASE-LR4 Ethernet systems, the crosstalk is better than −19 dB. By adjusting grating facets, the 3-dB spectral bandwidth is increased to 2.2 nm compared with 1.7 nm in a conventional design with a loss penalty less...
We experimentally demonstrate transmission of 20×50-Gb/s WDM PAM-4 channels over an 80-km uncompensated fiber link, based on reduced complexity DSP and hardware. BER values below pre-FEC limit of 3.8×10·3 are reported, validating the proposed architecture for low-cost, high-capacity short-reach connectivity.
In this work we analyse radio access networks (RAN) deployments from the capacity and cost points of view. We find that in order to support the new radio (NR) with system bandwidth of 800MHz and reduce the number of fibre connections between NR and baseband units (BBU) one can use dense wavelength division multiplexing (DWDM), pulse amplitude modulation (PAM4) or multicore fibre. We also find that...
We have introduced a novel metro network architecture called Ultra-Dense Wavelength Switched Network (UD-WSN) [1], which enables an even fine spectrum granularity so as to efficiently accommodate low-speed metro services (e.g., 1GE/10GE services). We evaluate the performance of this type of networks with spectrum defragmentation and partial optical transport network (OTN) switching. An efficient spectrum...
We propose a scheme of multi-channel quantum random generator based on superluminescent LED (SLED), which can use only one laser source to generate independent random bit sequences parallelly. By using dense wavelength division multiplexing (DWDM) module with 100 GHz interval, we produced 10 random bit streams in different channels, every stream's generating speed reaching 2.5 Gbps. All the random...
The expansion of cellular networks over the past decades has gone through an astonishing evolution. Due to centralized network functions, splitting of the generation/processing of RF signal in base band units (BBUs) and the baseband-RF conversion in remote radio heads (RRHs) has become inevitable. To systematically overcome the bandwidth and latency issues, a cost-efficient WDM-PON capable of linking...
42.5Gbps PAM4 transmission over 100 to 600 m NG-WBMMF at 850, 880, 910, 940 and 976 nm using PAM4 CMOS-IC chipset with real-time digital signal processing is investigated. The dispersion power penalty shows an inverse correlation with the overall bandwidth of the transmission links.
With the fast development of various applications, the demand for network bandwidth has been increasing significantly during the past decade. Although the WDM (wavelength-division multiplexing) technology has already provided high bandwidth using parallel wavelength channels, the overall network spectrum efficiency is however severely discounted by the fixed grid definition and standard rate transmission...
Wavelength division multiplexing (WDM) divides the huge bandwidth available on a fiber into several non-overlapping wavelength channels and enables data transmission over these channels simultaneously. Failure of the optical fiber causes loss of huge amount of data which can interrupt communication. There are several approaches to ensure network survivability. In survivability, we consider dedicated...
An analytical approach is presented to evaluate the bit error rate performance of a wavelength division multiplexing (WDM) fiber-optic transmission link with distributed Raman amplifier taking into account the combined effect of Amplified Spontaneous Emission (ASE) and Raman scattering induced crosstalk for direct detection receiver. The analysis is developed to find the photodetector output due to...
The wavelength sharing ability is a key problem of existing hybrid Wavelength/Time Division Multiplexing (WDM/TDM) based Passive Optical Networks (PON). Aimed to enhance the wavelength sharing ability, this article presents a new hybrid WDM/TDM PON enabled by Tunable Wavelength Converter (TWC) based switch. By making full use of newly advantages of tunable wavelength converter technologies, a switch...
Achieving energy savings in Ethernet passive optical networks (EPONs) becomes key factor for further development of optical access networks since energy usage increases rapidly. In recent years various energy-saving technics have been proposed among which enabling optical network units (ONUs) sleep time has been recognized as very promising approach for achieving energy savings in green EPONs. However,...
We demonstrate highly efficient and tunable wavelength conversion of 40-Gbps NRZ signals employing the cascade of sum frequency mixing and difference frequency mixing in a 50-mm-long quasi-phase matched lithium niobate waveguide. The result suggests possibility of selective and tunable wavelength conversion of 40-Gbps DWDM channels.
In this paper we will discuss avenues to exploit the potential low loss and low linearity of hollow core photonic band gap fibres (HC-PBGF) at 2 microns wavelength. In particular, we will show recent developments in semiconductor devices to enable a 100Gbit/s transmission demonstration.
Artificial Intelligence (AI)-based big data analysis is emerging for broad application fields, including manufacturing, autonomous car, health care, agriculture, and so on. Data centers are under severe pressure to meet ever-increasing demands on clouds. On the other hand, the amount of data processing is bounded by the total power budget, where the reasonable number is up to 20 MW. Therefore, the...
We propose an energy-efficient mechanism and a corresponding multi-dimension dynamic bandwidth allocation (DBA) algorithm for long-reach Ethernet passive optical networks (LR-EPONs). Time delay was reduced and upstream bandwidth was increased by 10%, and energy saving is increased by 90% when load is small.
Time and Wavelength Division Multiplexed Passive Access Network (TWDM-PON) can support 40Gb/s transmission rate, which has become a hot research topic. Due to the bandwidth flexibility, wavelength flexibility and multiple users' access, it is imperative to optimize network resources, improve the transmission rate meanwhile reduce network energy consumption. This paper has proposed two optimization...
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