Danmarks Tekniske Universitet

Kresten Yvind

Thor Ansbæk

Ole Hansen

Leif Katsuo Oxenløwe

Il-Sug Chung

Michael Galili

Arnhold Simonsen

Gyeong Cheol Park

Dagmawi Alemayehu Bekele

Jesper Mørk

Leif Katsuo OXENLØWE

Thor ANSBÆK

A grating reflector. The grating reflector includes a mesh structure defining a mesh plane and having a thickness normal thereto. The mesh structure includes parallel bars and parallel crossbars, which extend along a direction orthogonal to the bars. The bars and crossbars define a 2D grid of elongated holes, each extending through the mesh structure perpendicular to the mesh plane. The holes are elongated along a direction parallel to the bars and have a substantially rectangular shape with rounded corners. The 2D grid is defined by a cross-shaped unit cell having a bar section and an intersecting crossbar section. The grating reflector has a reflectivity in a bandwidth around a center wavelength higher than 0.99. A ratio between the unit cell volume and the center wavelength in the mesh material cubed is between 1.35 and 1.55.

Grating reflector

A waveguide-coupled cavity structure configured to exhibit Fano resonance (such as asymmetric Fano resonance or symmetric Fano resonance (inverse Lorentzian resonance), is utilized in an optical receiver or a method for direct detection of coherent optical signals by converting a phase-modulation on a coherent optical signal into an intensity-modulation of the optical signal. The waveguide-coupled cavity structure is designed for a transmission spectrum of the Fano resonance to overlap with a spectrum of the In modulated coherent optical signal to suppress transmission of at least one sideband of the modulated coherent optical signal through the structure, the sideband suppression being asymmetrical with respect to the carrier frequency of the modulated coherent optical signal. The invention may be used for direct detection of more advanced coherent modulation formats such as quadrature phase-shift keying (QPSK) signals and high order quadrature amplitude modulation (n-QAM) signals.

Direct detection of modulated coherent optical signals by means of a structure exhibiting Fano resonance

There is presented a method of for generating a compressed optical pulse () comprising emitting from a wavelength tunable microcavity laser system (), comprising an optical cavity () with a mechanically adjustable cavity length (L), a primary optical pulse () having a primary temporal width (T) while adjusting the optical cavity length (L) so that said primary optical pulse comprises temporally separated photons of different wavelengths, and transmitting said pulse through a dispersive medium (), so as to generate a compressed optical pulse () with a secondary temporal width (T), wherein the secondary temporal width (T) is smaller than the primary temporal width (T).

Method for generating a compressed optical pulse

There is presented a method of providing a wavelength tunable photon source (), comprising bonding a first element () with a first mirror (), a second element () with a second mirror () and a third element () with a photon emitter together in a structure enclosing an inner volume () being a sealed volume, and forming a bonding interface () which is gas-tight, so that the first mirror () is placed in the inner volume () so the first mirror () may move within the inner volume (). The method provides a relatively simple way of obtaining a tunable photon source where the inner volume is sealed. The invention furthermore relates to a corresponding photon source, and use of such photon source.

Wavelength tunable photon source with sealed inner volume

Wavelength sweepable laser source is disclosed, wherein the laser source is a semiconductor laser source adapted for generating laser light at a lasing wavelength. The laser source comprises a substrate, a first reflector, and a second reflector. The first and second reflector together defines an optical cavity, and are arranged to support light oscillation in the optical cavity along an optical path in a direction normal to the substrate. The optical cavity comprises a void in the optical path. The second reflector is resiliently suspended by a suspension in a distance from the first reflector and having a rest position, the second reflector and suspension together defining a microelectromechanical MEMS oscillator. The MEMS oscillator has a resonance frequency and is adapted for oscillating the second reflector on either side of the rest position. The laser source further comprises electrical connections adapted for applying an electric field to the MEMS oscillator. Furthermore, a laser source system and a method of use of the laser source are disclosed.

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Virum, Denmark

Kresten Yvind