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A low-loss and low-crosstalk Mach-Zehnder mode/wavelength multi/demultiplexer based on silica-PLC platform is proposed for WDM/MDM transmission. The Mach-Zehnder filter for “mode” and “wavelength” can be constructed by newly designed broadband 3dB-mode-divider. Furthermore, using Si/silica hybrid platform, footprint of the chip can be drastically reduced.
We present a simple device architecture enabled by an effective fabrication process to realize high-Q, ultra-compact microresonators with large free spectral ranges on silicon nitride at visible wavelengths. We demonstrate Qs >60 K for microdisks with radii as small as 2.5 μm.
This paper presents the characterization of frequency response and mode shape at the 1st harmonic frequency of a Micro-Opto-Mechanical Acoustic Sensors (MOMAS) with a Mach-Zehnder Interferometer (MZI) readout system. In previous research, the static modeling and characterization has been demonstrated. In this paper, we investigate the capability of using MOMAS in ultrasound domain as a Micro-Opto-Mechanical...
We discuss the possibilities of microring resonator based frequency comb sources for applications to THz-wave generation. Numerical simulations were performed using the Lugiato-Lefever model, combined with fully vectorial modal analyses, to investigate how the cavity design impacts the coherence properties of the combs and to quantitatively estimate the power conversion efficiency from the pump to...
We exploit a SiN/Si double-layer platform for an ultra-low crosstalk multi-port optical switch that exhibits −50 dB crosstalk in a bandwidth wider than the C-band. The platform possesses full compatibility with a silicon photonics platform.
Direct UV written planar waveguides in silica have been explored for over two decades [1]. The technique is capable of fabricating low-loss channel waveguides, couplers and Bragg gratings by translating an appropriate substrate through a focused UV beam. To date direct UV written waveguides have been primarily formed by using 244nm laser light, relying on the photosensitivity provided by germanium...
The development of mid-infrared (λ∼3–20 μm) integrated optical sensors has accelerated within the last years. The main driving interest is the potential of using photonic integrated elements capable of direct interaction with biomolecules and chemicals through their ground molecular vibrational modes, so that resonance fingerprints are exploited for novel sensor industrial applications. State-of-the-art...
The reliable generation of high-quality single photons has long been a goal of research in photonic quantum information. Direct-UV-written (DUW) silica-on-silicon waveguides provide a reproducible, uniform, low-loss, and fiber-compatible platform for the integration of spontaneous four-wave mixing-based heralded single-photon sources [1]. To overcome limitations caused by Rayleigh scattering, which...
This paper presents the modelling of a Micro-Opto-Mechanical Pressure Sensor (MOMPS) manufactured in a SiN integrated photonic platform. Implemented using a single wavelength Mach Zehnder Interferometer (MZI), it relies on a single readout detector that could be integrated directly on CMOS. Current photonic processes exhibit high residual stresses in the sensitive membrane. In this paper we will focus...
We present a thin-film periodically-poled lithium niobate (PPLN) wavelength converter for second-harmonic generation (SHG) and demonstrate with 2-micron light. The device is fabricated with a new developed surface-poling method and is compatible with photonic integration.
Optical frequency comb generation due to interplay between second-order and third-order nonlinearities is demonstrated in a silicon nitride microring resonator which shows normal group velocity dispersion for the fundamental wave. Mode-locked bright and dark pulses are generated at the through and drop ports respectively.
Silicon ring resonators have high thermal sensitivity of about 0.1 nm/°C. Using sol-gels as cladding material we show that sensitivity can be reduced down to 2 pm/°C within the temperature range from 12 °C to 40 °C.
Motivation for photonic integration can be summarized as reduction of cost, power consumption, size, packaging, and failures (FIT), and challenges in photonic integration are to achieve high yield. Heterogeneous photonic integration provides an opportunity for combining advantages from multiple photonic integration platforms. For instance heterogeneous integration of silicon, InP, and silica photonic...
Racetrack micro-resonator (MR), made from partially or totally oxidized porous silicon (PS) ridge waveguides fabricated with standard photolithography process, is reported. The design and the technological process are described including a study of waveguide dimensions that provide single mode propagation. Scanning electronic microscopy observations and optical characterizations clearly show that...
For any photonic device simulation, accuracy of numerical solution not only depends on methods being used but also on the discretization parameters used in the numerical methods. As solution accuracy may also depend on index contrast used in such photonic devices, the characteristics of a low-index contrast Germanium (Ge) doped Silica and a high-index contrast Silicon (Si) Nanowire Waveguides are...
In this work, we present a curl-curl formulation for computing the electromagnetic modes that propagate in a waveguide, fully or partially made with magneto-optic material. Such medium is characterized by a nonreciprocal permittivity tensor, which is responsible for a different propagation constant for the forward and backward traveling modes. By exploiting this property, an optical integrated isolator...
This tutorial reviews state-of-the-art heterogeneous 2D/3D photonic integration technologies involving various novel fabrication techniques leading to realization of chip-scale microsystems with photonic-electronic-integrated-circuits. Future prospects and challenges in computing and networking applications will also be discussed.
Integrated microresonators based on SiN waveguides are an attractive platform for nonlinear optics. Here we present a new photonic Damascene fabrication process that solves common problems in SiN waveguide fabrication and demonstrate frequency comb formation.
Penetration of liquids into SiO2 ridge waveguides during standard processing steps is shown to cause poor mode confinement and increased loss. Thermal annealing repeatedly restores a core with uniform index and low-loss mode confinement.
We studied the carrier relaxation dynamics in graphene-on-silicon nitride waveguides. Optically generated carriers from a quasi-continuous wave pump laser show a microsecond response time while those generated from mode-locked laser pulses exhibit accelerated relaxation dynamics.
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