The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We design and fabricate a space-efficient single-mode fiber (SMF) having a diameter of only 82 µm. The results show that this fiber satisfies the optical and mechanical specifications of the ITU-T G.654 recommendation. In comparison to the conventional SMF having a diameter of 125 µm, this fiber can be used to double the spatial efficiency in the space-sensitive system.
Highly-dense information in a structure can be useful to identify deformation, applied loads, or some kind of existing damages in implementation of structural health monitoring (SHM). Fiber-optic distributed strain sensors return a value of strain as a function of the linear position along an optical fiber, as they are having useful characteristics of optical fiber sensors for SHM, such as immunity...
We propose and demonstrate a polypropylene/poly (ethylene terephthalate) PP/PET based Michelson interferometer for acoustic sensing. It is realized by two beams of light, reflected into optical fiber collimators from both sides of the PP/PET film.
Ultrafast fiber lasers are becoming an essential tool in a range of applications from micromachining to biomedical imaging. Here, we review the advances that have enabled such rapid progress and the challenges ahead for this technology.
We demonstrate more than threefold increase of “effective capacity” by defragmentation in a realistic elastic network. Through diversified analysis, we also confirm that two simple indices, High-slot-Mark and Utilization-Entropy, represent wavelength fragmentation conditions well.
An overview is presented of recent progress in dynamic and distributed Brillouin-based fiber-optic sensing, culminating in sampling speeds, limited only by the fiber length.
Optical switching technologies have been attracting much attention because of the potential to save the cost and energy consumption. However, optical switching technologies have not been extensively used in the networks so far, while optical transmission technologies have been deployed widely. This paper figures out that the energy consumption of communication networks is going to rapidly increase...
We present a new mobile backhaul network design method for small cell deployment. We construct a multi-technology auxiliary graph to find cost-optimized backhauling solutions among various candidate transmission technologies and demonstrate through simulation results.
We have developed a high-sensitivity fiber temperature sensor using multimode interference. It comprises a multi-mode-fiber (MMF) sandwiched between single-mode-fibers. The MMF is coated with epoxy resin, whose refractive index is close to that of MMF.
We propose an individual channel launch power control method co-operated with nonlinear compensation in digital signal processing. Its effectiveness is evaluated in a network case study with various distances and modulation formats by numerical simulation.
We propose a spectrum defragmentation system using maximum ratio combining in wavelength diversity digital coherent transmission. We evaluate the maximum ratio combining characteristics and experimentally show hitless defragmentation of a 128-Gb/s PDM-QPSK signal.
Distributed signals undergo multiplexing/de-multiplexing in which many signals are sequentially multiplexed by subcarrier multiplexing on a single optical carrier. Precise and dense packing is achieved by cross-phase modulation in nonlinear fibers with locally defined subcarriers.
We experimentally demonstrate a novel coherent optical packet switching architecture for data center networks. This architecture uses coherent polarization-division multiplexed QPSK modulation to increase the capacity and relies on self-homodyne transmission for automatic tuning of the receiver LO. Information bearing packets and pilot tone signals are routed thought separated arrayed wavelength gratings...
The multi-granular optical-path architecture is a viable approach to creating large-scale optical metro and core networks. We conduct transmission and distributed signaling experiments that emulate the proposed architecture and confirm its technical feasibility.
We describe recent advances in wideband photonic signal processors including single-passband programmable microwave photonic filters, ultra-wideband phase shifters, multiple frequency microwave photonic measurement systems, and photonic RF memory structures, which provide new capabilities for the realisation of high-performance signal processing.
We developed a transmission system that applies an FEC coding scheme to an uncompressed 72-Gb/s 8K UHDTV optical signal. Stable optical transmission of the 8K image is successfully demonstrated in a 173-km field fiber experiment.
This paper proposes a cost-effective, scalable network architecture, which combines millimeter-wave (MMW) and free space optics (FSO) technologies that can be employed as a complementary solution for pre-deployed optical fiber based 5G cellular backhaul networks.
We report performance improvements by nonlinear mitigation techniques in homogeneous and heterogeneous network environments. Our results show that super channels with small sub carrier count benefit most from nonlinear mitigation.
A 20Gb/s Transimpedance Amplifier (TIA) is implemented in 65nm CMOS process using input-serial-peaking technique. Measurement results show that the hybrid integrated TIA with PD achieves up to 20Gb/s clean optical-diagram, with 4.3ps RMS-jitter, consuming 7.2mW.
Distributed temperature and strain sensing (DTSS) using optical fibre has many applications in monitoring the security and stability of infrastructure. Early detection is important to avoid catastrophic faults from occurring. This requires enhanced sensitivity of sensors, much beyond what is available today. Our work has centred on the enhancement of temperature and strain sensing using stimulated...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.