Filters

2011 - 201952020 - 20226

More filters

2019 - 201932020 - 20228
Reset filters

Settings

Author: Zimmermann, Lars × End date: 2022 × Has files: Yes × Type: Text × WGL Institute: IHP ×

Search Results

Now showing 1 - 10 of 11
  • Thumbnail Image
    Item
    Novel concept for VCSEL enhanced silicon photonic coherent transceiver
    (New York, NY : American Inst. of Physics, 2019) Seiler, Pascal M.; Ronniger, Gregor; Troppenz, Ute; Sigmund, Ariane; Moehrle, Martin; Peczek, Anna; Zimmermann, Lars
    We present a novel concept for an integrated silicon photonic coherent transceiver using vertical-emitting laser sources at 1550 nm. In a state of the art external modulation configuration, we deploy a VCSEL on the transmit and a HCSEL on the receive side. We demonstrate the feasibility of this approach by externally modulating the VCSEL with QPSK at up to 28 Gbaud. We also perform experiments with the VCSEL-HCSEL configuration in a slave-master optical injection locking setup for future data center interconnects. The results show stable locking conditions and the VCSEL is detuned to perform predominant phase modulation. To the best of our knowledge, this is the first time direct phase modulation of a VCSEL under optical injection locking was demonstrated using two vertically emitting laser sources as master - and slave laser. © 2019 Author(s).
  • Thumbnail Image
    Item
    Modulation Linearity Characterization of Si Ring Modulators
    (Washington, DC : OSA, 2021) Jo, Youngkwan; Mai, Christian; Lischke, Stefan; Zimmermann, Lars; Choi, Woo-Young
    Modulation linearity of Si ring modulators (RMs) is investigated through the numerical simulation based on the coupled-mode theory and experimental verification. Numerical values of the key parameters needed for the simulation are experimentally extracted. Simulation and measurement results agree well. With these, the influence of input optical wavelength and power on the Si RM linearity are characterized.
  • Thumbnail Image
    Item
    Design and performance analysis of integrated focusing grating couplers for the transverse-magnetic TM00 mode in a photonic BiCMOS technology
    (London : Biomed Central, 2020) Georgieva, Galina; Voigt, Karsten; Peczek, Anna; Mai, Christian; Zimmermann, Lars
    Focusing grating couplers for the excitation of the fundamental transverse-magnetic (TM) mode in integrated silicon photonic waveguides are designed and characterized under the boundary conditions of a photonic BiCMOS foundry. Two types of waveguide geometries are considered – a nanowire and a rib waveguide. Wafer-scale experimental results for nanowire TM grating couplers are in excellent agreement with numerical investigations and demonstrate a robust behavior on the wafer. The mean coupling loss and the 3s interval are -3.9 ± 0.3 dB. The on wafer variation is three times lower than for the fundamental transverse-electric (TE) polarization. Similarly, the coupling in rib waveguides is examined as well. The results indicate that the rib waveguides require a modified geometry when designed for TM. In general, the nanowire waveguide type is more suitable for TM coupling, showing a stable and repeatable performance. © 2020, The Author(s).
  • Thumbnail Image
    Item
    A physical origin of cross-polarization and higher-order modes in two-dimensional (2D) grating couplers and the related device performance limitations
    (Bristol : IOP Publishing, 2021) Georgieva, Galina; Voigt, Karsten; Seiler, Pascal M.; Mai, Christian; Petermann, Klaus; Zimmermann, Lars
    We explore scattering effects as the physical origin of cross-polarization and higher-order modes in silicon photonic 2D grating couplers (GCs). A simplified analytical model is used to illustrate that in-plane scattering always takes place, independent of grating geometry and design coupling angle. Experimental investigations show furthermore that grating design parameters are especially related to the modal composition of both the target- and the cross-polarization. Scattering effects and the associated cross-polarization and higher-order modes are indicated as the main reason for the higher 2D GC insertion loss compared to standard 1D GCs. In addition, they can be responsible for a variable 2D GC spectrum shape, bandwidth and polarization dependent loss.
  • Thumbnail Image
    Item
    Si photonic-electronic monolithically integrated optical receiver with a built-in temperature-controlled wavelength filter
    (Washington, DC : Soc., 2021) Kim, Hyun-Kyu; Kim, Minkyu; Kim, Min-Hyeong; Jo, Youngkwan; Lischke, Stefan; Mai, Christian; Zimmermann, Lars; Choi, Woo-Young
    We present a Si photonic-electronic integrated ring-resonator based optical receiver that contains a temperature-controlled ring-resonator filter (RRF), a Ge photodetector, and receiver circuits in a single chip. The temperature controller automatically determines the RRF temperature at which the maximum transmission of the desired WDM signal is achieved and maintains this condition against any temperature or input wavelength fluctuation. This Si photonic-electronic integrated circuit is realized with 0.25-µm photonic BiCMOS technology, and its operation is successfully confirmed with measurement.
  • Thumbnail Image
    Item
    Cross-polarization effects in sheared 2D grating couplers in a photonic BiCMOS technology
    (Bristol : IOP Publ., 2020) Georgieva, Galina; Voigt, Karsten; Mai, Christian; Seiler, Pascal M.; Petermann, Klaus; Zimmermann, Lars
    We investigate numerically and experimentally sheared 2D grating couplers in a photonic BiCMOS technology with a focus on their splitting behavior. Two realization forms of a waveguide-To-grating shear angle are considered. The cross-polarization used as a figure-of-merit is shown to be strongly dependent on the grating perturbation strength and is a crucial limitation not only for the grating splitting performance, but also for its coupling efficiency. © 2020 The Japan Society of Applied Physics.
  • Thumbnail Image
    Item
    Modular coherent photonic-aided payload receiver for communications satellites
    ([London] : Nature Publishing Group UK, 2019) Duarte, Vanessa C.; Prata, João G.; Ribeiro, Carlos F.; Nogueira, Rogério N.; Winzer, Georg; Zimmermann, Lars; Walker, Rob; Clements, Stephen; Filipowicz, Marta; Napierała, Marek; Nasiłowski, Tomasz; Crabb, Jonathan; Kechagias, Marios; Stampoulidis, Leontios; Anzalchi, Javad; Drummond, Miguel V.
    Ubiquitous satellite communications are in a leading position for bridging the digital divide. Fulfilling such a mission will require satellite services on par with fibre services, both in bandwidth and cost. Achieving such a performance requires a new generation of communications payloads powered by large-scale processors, enabling a dynamic allocation of hundreds of beams with a total capacity beyond 1 Tbit s−1. The fact that the scale of the processor is proportional to the wavelength of its signals has made photonics a key technology for its implementation. However, one last challenge hinders the introduction of photonics: while large-scale processors demand a modular implementation, coherency among signals must be preserved using simple methods. Here, we demonstrate a coherent photonic-aided receiver meeting such demands. This work shows that a modular and coherent photonic-aided payload is feasible, making way to an extensive introduction of photonics in next generation communications satellites.
  • Thumbnail Image
    Item
    Penalties From 2D Grating Coupler Induced Polarization Crosstalk in Silicon Photonic Coherent Transceivers
    (New York, NY : IEEE, 2022) Georgieva, Galina; Sena, Matheus; Seiler, Pascal M.; Petermann, Klaus; Fischer, Johannes; Zimmermann, Lars
    Silicon photonic two-dimensional grating couplers for C- and O-band dual-polarization coherent transceivers are analyzed with respect to their polarization splitting/combining performance. Due to scattered light in the grating's plane, a linear cross-polarization results. The latter is responsible for a limited polarization split ratio and a polarizations' non-orthogonality. The impact of these two quantities is evaluated by system-level simulations with regard to OSNR penalties in coherent systems. For both C- and O-band, a design modification for reduced penalties is proposed.
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Verbundprojekt: Neuartige Lichtquellen und Komponenten für Silizium-Photonik (SiliconLight), IHP-Teilvorhaben: MIS-Lichtemitter auf Basis von Versetzungsnetzwerken und Erweiterung einer BiCMOS-Technologie um photonische Elemente : Schlussbericht zum Vorhaben
    (Hannover : Technische Informationsbibliothek (TIB), 2011) Kittler, Martin; Arguirov, Tzanimir; Mchedlidze, Teimuraz; Oehme, Michael; Reiche, Manfred; Seifert, Winfried; Trushin, Maxim; Wenger, Christian; Zimmermann, Lars; Richter, Harald; Stolarek, David; Tian, Hui; Fraschke, Mirko
    [no abstract available]