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This paper proposes a unified design of log likelihood ratio (LLR) quantization and joint reception (JR) to reduce the mobile fronthaul (MFH) bandwidth in the split-physical (PHY) processing (SPP). SPP is one of the schemes that redefine the base station (BS) functional split between a baseband unit (BBU) and a remote radio head (RRH) in cloud radio access network (C-RAN). SPP splits the BS functions...
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.
From a service provider's point of view, we review the requirements on and status of datacenter optical interconnects and discuss the challenges for future datacenter networks, including both intra- and inter-datacenter optical interconnect technologies.
High bandwidth density on-board optical transmitter is reported in this paper. This on-board transmitter contains 4×12-channel 10Gbps CMOS driver ICs and 4×12-channel 850nm Multimode (MM) VCSEL arrays, with a total 48×10Gbps bandwidth and is packaged through flip-chip bonding on a flexible printed circuit (FPC) with SnAg solder bumps. Due to the compact package design, based on a commercial 1mm pitch...
We propose and experimentally demonstrate for the first time, M-PAM transmission through a hybrid POF/VLC downlink using off-the-shelf components. The link consists of 60 m SI-POF and 1 m VLC and with the aid of a blue filter, the link has an effective bandwidth of 17 MHz. Conventional adaptive decision feedback equaliser (DFE) and multi-layer perceptron DFE (MLP-DFE) are also implemented and their...
For interconnection between geographically-separated data centers, network carriers typically implement multiple optical paths in a wide-area network. For example, when transmission wavelengths have 100 Gb/s granularity, three 100 Gb/s wavelength paths are provisioned to satisfy a customer demand of 300 Gb/s. Over the multiple provisioned paths, interconnection traffic is typically distributed using...
The concept of hybrid polymer optical fibre (POF) and visible light communication (VLC) for in-home networking is experimentally evaluated in this paper. The performance evaluation is based on two schemes of discrete multitone (DMT) and multilevel pulse amplitude modulation (PAM) techniques. The combined effects of modal dispersion of the POF and the limited bandwidth of the phosphor converted illumination...
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...
With the proliferation of wireless electronic devices such as RFID, In-flight Entertainment (IFE) and Personal Electronic Devices (PED) it is important to understand how these systems interact with one another and flight critical systems onboard aircraft. Overall system performance is also of interest due to the varying system performance based on subcomponent installation locations. This paper describes...
The rapid increase of bandwidth requirements between processors in high-end servers motivates the integration of optical interconnects on the first-level processor package [1]. In this perspective, additional bandwidth density can be achieved by integrating optical transceivers directly into the processor die. Optically enabled CPUs can provide energy-efficient, low-latency interconnects over long...
We present a wavelength-dependent optical true time delay (TTD) for K-band radio beamformer targeting home-satellite communication. A proof-of-concept of optically-assisted radio beamformer with a TTD bandwidth of 2GHz is experimentally demonstrated. The beamformer is capable of generating multiple radio beams if multiple wavelengths are employed.
Optically-connected distributed-type millimeter-wave radar system is one of the key solutions to develop a wide coverage, a high detection performance and a high-resolution radar with a low cost. We have been developed optically-connected 96 GHz millimeter-wave radar system to detect small foreign object debris on the airport runways. The radar transmission signal is delivered to the antenna by the...
Nature-inspired approaches are powerful methods to solve many tough optimization problems. This paper proposes the two optimization approaches named, Big bang-big crunch and Firefly optimization algorithm to solve the optical channel-allocation problem in the optical wavelength division multiplexing systems by using the optimal Golomb ruler sequences. The simulation results conclude that both approaches...
The SLICE architecture for a 6-node network with its components is analyzed. Balanced load spectrum allocation and shortest path with maximum reuse are simulated to address the routing and spectrum allocation. The algorithms results show the reduction in sub-carrier utilization in a SLICE optical network. The simulation results also gives us the maximum subcarriers utilized in each case for various...
In application, good OOCs have the property that each codeword has many more 0s than 1s. The code length of a conventional 1D-OOC is always large in order to achieve good bit error rate performance. However, long code sequences will occupy a large bandwidth and reduce the bandwidth utilization. 1D-OOCs also suffer from relatively small cardinality. The 2D-OOCs overcome both of these shortcomings....
This paper presents a broadband dispersion compensating photonic crystal fiber (B-DCPCF) with a high compensation ratio of 100:1. We theoretically tailored the negative dispersion in a photonic crystal fiber (PCF) to nullify the positive dispersion in the transmission fiber over a bandwidth range of as wide as possible. The numeric results indicate that the effective dispersion within ±0.2 ps/km/nm...
Elastic optical networks has emerged as a solution for dealing with the diversity of bandwidth demands of network applications. However, networks are not sufficiently resilient, survivable, highly available and dependable, therefore, protection techniques have been developed to cope with failures. Among these techniques, p-cycle is a very attractive once since it provides ring-like speed of restoration...
We experimentally demonstrate bandwidth efficient transmission of 96-IF carriers LTE-A signals with 118-Gb/s CPRI-equivalent rate using 2-GHz bandwidth and intermixing mitigation. After 20-km mobile fronthaul transmission, EVM is below 5% for entire IF carriers.
Carrier lifetime limited bandwidth in proposed III-Nitride LED is relaxed with further improvement in its internal quantum efficiency. Moderate output power (1.7mW) with record-high 3-dB electrical-to-optical bandwidth (1GHz) among all reported visible LEDs is demonstrated.
We demonstrate InP-based modified uni-traveling carrier (MUTC) photodiodes (PDs) with top p-contact on silicon-on-insulator (SOI) nano-waveguides. The photodiodes have a low dark current of 10 nA, high internal responsivity of 0.84 A/W and bandwidths up to 35 GHz.
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