Weighted Sum Rate Maximization for Zero-Forcing Methods with General Linear Covariance Constraints

  • Claussen H.
  • Farrell R.
  • Flanagan M.
  • Pham T.
  • Tran L.

In this paper, an efficient approach for weighted sum rate maximization (WSRMax) for zero-forcing (ZF) methods with general linear transmit covariance constraints (LTCCs) is proposed. This problem has been extensively studied separately for some special cases such as for sum power or per-antenna power constraint (PAPC). Due to some practical ...

Dynamic Multicast Distribution Trees for mmWave Wireless Mesh Network (WMN) Backhaul

  • Seppaenen K.
  • Wainio P.

Network densification as well as new higher fre- quencies are seen as a solution to meet the capacity promises of 5G. However, this will mean much more frequent handovers and thus challenges for mobility management (MM). New MM schemes are being developed to allow rapid transmission / access point (AP) ...

Ultra-Dense Networks: Is There a Limit to Spatial Spectrum Reuse?

  • Ding M.
  • Lin Z.
  • Lopez-Perez D.
  • Mao G.

The aggressive spatial spectrum reuse (SSR) by network densification using smaller cells has successfully driven the wireless communication industry onward in the past decades. In our future journey toward ultra-dense networks (UDNs), a fundamental question needs to be answered. Is there a limit to SSR? In other words, when we ...

Joint Link Adaptation and Scheduling for 5G Ultra-Reliable Low-Latency Communications

  • Mogensen P.
  • Pedersen K.
  • Pocovi G.

This paper presents solutions for efficient multiplexing of ultra-reliable low-latency communications (URLLC) and enhanced mobile broadband (eMBB) traffic on a shared channel. This scenario presents multiple challenges in terms of radio resource scheduling, link adaptation and inter-cell interference, which are identified and addressed throughout the paper. We propose a joint ...

3GPP C-V2X and IEEE 802.11p for Vehicle-to-Vehicle Communications in Highway Platooning Scenarios

  • Bakowski K.
  • David Lister
  • Garcia I.
  • Ilaria Thibault
  • Krzysztof Wesolowski
  • Michal Sybis
  • Patrick Marsch
  • Pawel Sroka
  • Vukadinovic V.
  • Xu H.

The focus of this study is the performance of high-density truck platooning achieved with different wireless technologies for vehicle-to-vehicle (V2V) communications. Platooning brings advantages such as lower fuel consumption and better traffic efficiency, which are maximized when the inter-vehicle spacing can be steadily maintained at a feasible minimum. This can ...

Dynamic Load Balancing with Tokens

  • Comte C.

The assignment of jobs to servers in a computer cluster is subject to many practical constraints like data locality. This brings the need for simple load balancing schemes that capture these constraints in the assignment decision. In this paper, we propose a token-based mechanism that balances load without requiring an ...

Radiated Immunity Field Uniformity Enhancement Techniques for milli-meter Wave Frequencies

  • Moongilan D.

Milli-meter wave frequencies will be used extensively in 5G wireless communication and IOT network devices. These devices could be exposed to high electromagnetic fields and must be hardened to operate and coexist in their intended electromagnetic environments, and be protected from interference and sabotage. Most of these devices would be ...

Silicon Photonics Enabled Hyper-wideband RF Receiver With > 85% Instantaneous Bandwidth

IEEE We demonstrate the first-ever silicon photonics enabled hyper-wideband RF spread-spectrum link. A hybrid III/V-silicon photonic mode-locked laser encoded with a four-channel silicon photonic phase encoder is used to generate optical carriers that coherently demodulate a received RF signal spanning an instantaneous bandwidth greater than 85% of the center frequency ...

Triple-clad photonic lanterns for mode scaling

© 2018 Optical Society of America We propose a novel triple-clad photonic lanterns for mode scaling. This novel structure alleviates the adiabatic tapering requirement for the fabrication of large photonic lanterns. A 10-mode photonic lantern with insertion losses ranging from 0.6 to 2.0 dB across all the modes and a ...

Modelling packet insertion on a WSADM ring

  • Amar D.
  • Chiaroni D.
  • Gravey A.
  • Gravey P.
  • Morvan M.
  • Uscumlic B.

The WDM slotted Add/Drop Multiplexer (WSADM) technology relies on time slotted WDM rings, where a slot can carry a single WDM packet. All stations can insert and receive these WDM packets. This differs from previous architectures in which packets were carried over a single wavelength, while multiple packets could be ...

Scalable Deterministic Scheduling for WDM Slot Switching Xhaul with Zero-Jitter

  • Chiaroni D.
  • Gravey A.
  • Gravey P.
  • Leclerc B.
  • Morvan M.
  • Uscumlic B.
  • Zami T.

A low-cost WDM slot switching "N-GREEN" network running a deterministic scheduling provides zero-jitter forwarding as needed by CPRI traffic. For a first time, a dedicated integer linear program and a corresponding scalable heuristic have been used together to compute such scheduling and evaluate its efficiency with N-GREEN technology. The results ...

Enhancing performance of coherent OTDR systems with polarization diversity complementary codes

  • Awwad E.
  • Dorize C.

Monitoring the optical phase change over a fiber paves the way for a wide range of applications that induce fast strain variations as detection of vibration and acoustic signals. However, the quality of the estimated fiber channel response strongly depends on the method used to optically excite the optical fiber ...

100-GHz Low Voltage Integrated Lithium Niobate Modulators

  • Bertrand M.
  • Chen X.
  • Marko Lon?Ar
  • Sethumadhavan C.
  • Shams-Ansari A.
  • Wang C.
  • Winzer P.
  • Zhang M.

We demonstrate monolithically integrated lithium niobate modulators consisting of sub-wavelength waveguides and velocity-matched RF transmission lines. We measure an RF V<inf>&#x03C0;</inf> as low as 2.3 V and an electro-optic bandwidth up to 100 GHz.

Mode Scrambler Using CO<inf>2</inf>-laser Inscribed Long-period Gratings

  • Chen H.
  • Fontaine N.
  • Li J.
  • Liu Y.
  • Ryf R.
  • Zhao Y.

We demonstrate a mode scrambler using CO<inf>2</inf>-laser inscribed long-period gratings for mixing 3 spatial modes. The mode-dependent loss and modal transfer matrices versus wavelength are characterized using a swept-wavelength interferometer.

System Benefits of Coupled-Core Multicore Fibers with Different Coupling Lengths

  • Essiambre R.
  • Rademacher G.
  • Ryf R.

We study the impact of the linear coupling length and the number of cores on the nonlinear benefit of the coupled-core multicore fiber having up to 19 cores. Coupling lengths as short as a few meters improves transmission.

Modal Crosstalk Mitigated IM/DD Mode-Multiplexed Transmission Based on Pilot Assisted Least Square Algorithm

  • Chen H.
  • Chen J.
  • Fontaine N.
  • Huang Q.
  • Liu M.
  • Ryf R.
  • Wang F.
  • Zhang Q.

We experimentally demonstrate mode group crosstalk mitigation in IM/DD mode-multiplexed OFDM transmission using pilot assisted least square algorithm. Transmission performance is improved through mitigating the crosstalk between the LP01and LP11mode groups.

Characterizing Chromatic Dispersion of Multiple Few-Mode Fibers Using Bidirectional OTDR Technique

  • Chen H.
  • Fontaine N.
  • Li G.
  • Li J.
  • Liu H.
  • Ryf R.

We use bidirectional OTDR technique to measure effective areas of two LP modes at four discrete wavelengths in cascaded few-mode fibers, with the help of mode-selective photonic lanterns, and calculate the chromatic dispersion.

55GHz EAM bandwidth and beyond in InP active-passive photonic integration platform

  • Augustin L.
  • Blache F.
  • Debregeas H.
  • Haan E.
  • Leijtens X.
  • Trajkovic M.
  • Williams K.

We demonstrate 50GHz and above 55GHz E/O bandwidth for 100&#x03BC;m and 50&#x03BC;m-long electro-absorption modulator, within the offerings of the generic InP active-passive integration platform. Discussion on going even further in bandwidth is presented.

95dB Sensitivity in a Chip-Scale Swept-Source Optical Coherence Tomography System

  • Bishop D.
  • Bolle C.
  • Cappuzzo M.
  • Earnshaw M.
  • Eggleston M.
  • Farah B.
  • Fontaine N.
  • Pardo F.
  • Pollock C.
  • Safar H.

Record high sensitivity of 95dB is achieved in a chip-scale SS-OCT system. A PLC interferometer, on-chip balanced diode pair, and ball lens coupled MEMS mirror form an ultra-compact optical engine for 3D imaging.

Integrated Photodiodes for On-chip Semiconductor Optical Amplifier Gain Measurement

  • Brenot R.
  • Carrere H.
  • Debregeas H.
  • Garreau A.
  • Gomez Carbonell C.
  • Mekhazni K.
  • Verdier A.

Two photodiodes are integrated on a semiconductor optical amplifier for on-chip measurement of the gain. Coupled waveguides drive fraction of light into photodiodes and gain is calculated from photocurrents ratio. Good consistency is found with optical characterization of the gain. The method is not sensitive to coupling losses and can ...