Journal: Journal of Lightwave Technology

Abbreviation

J. lightwave technol.

Publisher

IEEE

Journal Volumes

ISSN

0733-8724
1558-2213

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Publications 1 - 10 of 56
  • DAC-Less Amplifier-Less Generation and Transmission of QAM Signals Using Sub-Volt Silicon-Organic Hybrid Modulators
    Item type: Journal Article
    Wolf, Stefan; Lauermann, Matthias; Schindler, Philipp; et al. (2015)
    Journal of Lightwave Technology
  • A Full Field-of-View Self-Steering Beamformer for 5G mm-Wave Fiber-Wireless Mobile Fronthaul
    Item type: Journal Article
    Huang, Min-Yu; Chen, You-Wei; Peng, Peng-Chun; et al. (2020)
    Journal of Lightwave Technology
    The upcoming new radio access allows ultra-high data rate using millimeter-wave (mm-Wave) frequencies, while it normally suffers from large path loss. To compensate for path loss, phased arrays for both the transmitter and receiver are used. The 5G new radio (NR) three beam management process proceeds as follows: The transmitted beam is first swept in the downlink direction from the remote radio unit (RRU) to the user equipment (UE), and then the uplink beam is aligned to determine which beam direction has the best reception quality, and vice versa. However, this sequential beam management requires that the RX must be able to perform both beam detection and steering across all the reception angles. Moreover, due to the narrow beamwidth of the phased array operation, a “quantum leap” performance improvement of the receiver operating at mm-Wave is required. In this article, a self-steering array beamformer (SSA-BF) receiving system is proposed, which is composed of a home-designed IC package with zero DC power consumption and a 4-element antenna array. We first conduct the measurement without the antenna, and the SSA-BF receiver shows a significant array factor enhancement with negligible SNR degradation over full field-of-view (FoV) (incidence angle = ±90°), <; 3 ms fast beam alignment time, and it can support enhanced mobile data-rate up to 10 and 7.8 Gb/s with 20 × 100 MHz carrier aggregation OFDM in back-to-back and over 25-km fiber transmission, respectively. Moreover, a broadside 3-dB beamwidth ±80° and broadband 17-36 GHz antenna is designed for the proposed SSA-BF receiver in a 5G fiber-wireless access. The SSA-BF receiving system with the 1 × 4 antenna array is designed at 28 GHz, and it shows the normalized array gain better than 3- and 6-dB degradation over broad FoV incidence = ±68° and ±85°, respectively. Without any external tuning controls, the proposed SSA-BF achieves the state-of-the-art autonomous beamforming for 6 Gb/s 64-QAM signal over 50-cm wireless distance, achieving a substantial array factor improvement. To the best of authors' knowledge, this is the first demonstration of a high-speed switching SSA-BF receiver in a fiber-wireless integrated radio access as a true enabler for mm-Wave mobile fronthaul applications.
  • Low-Complexity Real-Time Receiver for Coherent Nyquist-FDM Signals
    Item type: Journal Article
    Bäuerle, Benedikt; Josten, Arne; Eppenberger, Marco; et al. (2018)
    Journal of Lightwave Technology
  • Calculation of losses in micro-ring resonators with arbitrary refractive index or shape profile and its applications
    Item type: Journal Article
    Rabiei, Payam (2005)
    Journal of Lightwave Technology
  • Perpendicular Grating Coupler Based on a Blazed Antiback-Reflection Structure
    Item type: Journal Article
    Watanabe, Tatsuhiko; Ayata, Masafumi; Koch, Ueli; et al. (2017)
    Journal of Lightwave Technology
  • All-Plasmonic IQ Modulator With a 36 mu m Fiber-to-Fiber Pitch
    Item type: Journal Article
    Ayata, Masafumi; Fedoryshyn, Yuriy; Heni, Wolfgang; et al. (2019)
    Journal of Lightwave Technology
  • Plasmonic Ferroelectric Modulator Monolithically Integrated on SiN for 216 GBd Data Transmission
    Item type: Journal Article
    Kohli, Manuel; Chelladurai, Daniel; Messner, Andreas; et al. (2023)
    Journal of Lightwave Technology
    A high-speed plasmonic barium titanate (BTO, BaTiO3) Mach-Zehnder modulator is presented. We combine nanoscale plasmonics with BTO as solid-state active material and silicon nitride (SiN) for versatile and low loss waveguiding, and integrate them in a monolithic platform. We demonstrate a plasmonic BTO modulator processed onto foundry-produced SiN. The 15 μm long high-speed modulator features a flat electro-optic frequency response up to 70 GHz and is expected to be flat way beyond. A low VπL product of 144 Vμm is shown. Data experiments reaching 216 Gbit/s with a 216 GBd 2PAM signal and 256 Gbit/s with a 128 GBd 4PAM signal are demonstrated. The merger of the versatile silicon nitride platform with high-speed plasmonics using the highly nonlinear ferroelectric BTO is an attractive solution as a future Tb/s optical interconnect platform.
  • Closed-Loop Control of Photonic Ring Resonators by Means of Photo-Thermal Plasmonic Sensors
    Item type: Journal Article
    Di Tria, Alessandro; Martinez, Andres; Grimaldi, Vittorio; et al. (2024)
    Journal of Lightwave Technology
    This paper highlights the effectiveness of photo-thermal plasmonic sensors in enabling real-time closed-loop stabilization of photonic devices. To assess the waveguided optical power, the in-line detector leverages the photo-thermal resistance variation of a micrometric plasmonic strip in contact with the waveguide. The generated signal is used to lock to resonance a ring resonator against wavelength and temperature variations, in a silicon-based technology. Thanks to the high sensitivity of the detector and its limited penalty on the waveguide loss, automatic re-tuning of the ring resonator with a recovery time of 20 ms has been successfully achieved. The micrometric dimensions of the sensor, its technological simplicity, and the delivered signal (proportional to the optical power) make the photo-thermal plasmonic sensor an attractive in-line candidate for closed-loop control of optical devices, regardless of the technology employed for the photonic chip fabrication.
  • Pulse-Shaping With Digital, Electrical, and Optical Filters-A Comparison
    Item type: Journal Article
    Schmogrow, Rene; Ben-Ezra, Shalva; Schindler, Philipp C.; et al. (2013)
    Journal of Lightwave Technology
  • All-optical Mach-Zehnder interferometer wavelength converters and switches with integrated data- and control-signal separation scheme
    Item type: Journal Article
    Leuthold, Juerg; Besse, Pierre-André; Gamper, Emil; et al. (1999)
    Journal of Lightwave Technology
    All-optical Mach-Zehnder interferometer (MZI) wavelength converters and switches with monolithically integrated data- and control-signal separation schemes are reported. Two schemes to separate the data from the strong control signals are discussed. A first dual-order mode configuration uses modes of different symmetry for the data and control signals. A second configuration uses additional MZI's to separate the two signals. The control-signal separation permits to operate the devices with copropagating data and control signal without distortion of the control signal in the data-signal output. Copropagative operation allows for shorter switching windows compared to the counterpropagative operation. Further, this concept enables cascading of several devices since the control signal is filtered out and does not disturb the signal processing in a next cascade of devices. The all-optical switches are characterized under static and dynamic 10 GHz conditions.
Publications 1 - 10 of 56