Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
Real-time transmission with 26-GBaud PAM-4 as a promising modulation format for data-center interconnects with operation in C-band is evaluated. For an OSNR penalty below 2 dB a dispersion tolerance of up to 10 km of SSMF is achieved.
We demonstrate 51.5625Gbps PAM4 transmission over ≥ 150 m next generation wide band MMF using SWDM TOSAs from 850 nm to 940 nm indicating an aggregated 206.25 Gb/s speed achievable on a single WBMMF.
Our aim in this work is to characterize experimentally the transmission properties of a 19-core plastic optical fiber and to compare them to those obtained for several single-core POFs under the same conditions. Thus, we measured frequency response, attenuation and angular output power distribution as functions of fiber length under different configurations. Additionally, measurements of parameters...
Next-generation access networks (NGANs) mainly include wavelength division multiplexing (WDM) based 60GHz Radio over Fibre systems (60G-RoF) and WDM Passive Optical Networks (WDM-PONs). Semiconductor optical amplifier may be the key device of colorless unit in these WDM based systems. The device can be effectively utilized as external modulator because it can perform simultaneously amplification and...
In 5G wireless systems, centralized RAN (C-RAN) is an architectural choice where the signal waveforms received by Remote Radio Heads (RRH) are transparently forwarded to base band units (BBU), in many cases using an optical fronthaul. Although C-RAN highly simplifies the RRH, which is positive from the operational cost standpoint, much of the system complexity and cost is shifted towards the optical...
The spatial superchannel (Sp-Ch) allocation that is enabled by newly developed switching nodes supporting spatial group switching is anticipated to show significant cost savings in future SDM networking deployments. In this paper, we compare the performance of different spatial Sp-Ch switching paradigms, under different spatial and spectral granularities. The spatial granularity is related to the...
We review our recent progress on the realisation of pulse shaping in passively-mode-locked fibre lasers by inclusion of an amplitude and/or phase spectral filter into the laser cavity. We numerically show that depending on the amplitude transfer function of the in-cavity filter, various advanced temporal waveforms can be generated, including parabolic, flattop and triangular pulses. An application...
In this paper, we investigate the impact of linear mode coupling on the efficiency of intermodal four-wave mixing and on the group delay statistics in few-mode fibres. The investigation will include not only the weak or strong linear coupling regimes, but also the transition region between them, the intermediate coupling regime. This analysis will allow to assess the level of coupling strength require...
The seemingly insatiable demand for mobile, video and cloud-based services shows no sign of slowing down. High bandwidth-consuming applications such as super-sized cloud storage and 4K/Ultra High Definition video services are becoming more and more popular. This causes requirements for optical networks to reach transmission of 100 Gbps and beyond. However, going beyond 100 Gbps does not come without...
This paper presents a fully integrated optical receiver for On-Off-Keying (OOK) visible-light communication (VLC) links. The circuit is implemented in AMS 0.35μm technology, with the OPTO process option allowing for high-quality photo-detectors integration. The implemented receiver exhibits a low input referred noise density of 5 pA/VHz to meet the sensitivity requirements of free-space optical wireless...
A 800-Mb/s optical receiver based on pulse-position-modulation (PPM) scheme is presented. The proposed PPM receiver can recover the clock without any help of a reference clock or a forwarded clock. As a result, the number of wire and pin count is minimized. Moreover, the proposed receiver employs optical front-en d circuits for fiber-optic communications which is optimized for low-power operation...
A basic rule in signal analysis is to use an antialiasing filter before data decimation. Surprisingly, this fundamental rule is often missed in time and frequency community and this leads to problems when data are analyzed. They are particularly evident in case of fiber links, especially when the Allan variance is calculated. Here, we show that aliasing can be induced by the measurement instrument...
Progress in photonic analog-to-digital conversion architectures and system design issues will be discussed taking full advantage of recent photonic, electronic and signal processing technologies. Specifically targeted will be architectures supporting operational frequencies exceeding the sampling rate as well as recent work on compressive sampling, where instantaneous bandwidths larger than the sampling...
We proposed to mitigate the effect of modal dispersion by reducing the effective NA of the fiber link. A simple spatial mode filtering technique has been experimentally demonstrated to improve the performance over a 30 m link, achieving a BER of 10−8 at 1 Gbps. This approach offers a simple and a cost-effective solution to deliver Gigabit Ethernet using NRZ signaling over short reach POF networks...
Massive fiber-to-the-home network deployment is creating a challenge for telecommunications network operators: exponential increase of the power consumption at the central offices and a never ending quest for equipment upgrades operating at higher bandwidth. In this paper, we report on flexible signal slicing technique, which allows transmission of high-bandwidth signals via low bandwidth electrical...
We discuss survivability considerations for multi-carrier-based elastic optical networks, focusing on the multi-carrier transponder (MCT). We explain the necessity of subcarrier restoration that can recover multi-carrier connections using backup sub-channels. An initial evaluation shows our restoration scheme improves transponder reliability.
We designed a high-baud-rate UTC photodetector without a bias circuit for the first time. The photodetector's wideband frequency response over 100 GHz and clear eye diagrams up to 107 Gbaud were confirmed at 0 V. Bit error rate is discussed for 56 Gbaud and 107 Gbaud.
We propose a novel Brillouin-based loss-monitoring scheme for passive optical networks (PONs) that can compensate for Brillouin gain profile variations along cables. The highly sensitive measurement of a PON with mixed deployment of different fibre types was successfully demonstrated.
We experimentally demonstrated an 850-nm VCSEL based 112-Gb/s short reach interconnection system with 200-m MMF transmission employing a duobinary 4-PAM format. The sensitivity of −4.8 dBm at the 6.7% overhead FEC limit (BER=4.2×10−4) was achieved.
We report enhanced graded-index multimode polymer waveguides with >70GHz×m for MMF launch and >200GHz×m for restricted launch, indicating the capability of on-board waveguide transmission of >100 Gb/s. Simulations using the measured refractive index profile agree well with the experiments.
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.