Abstract:
A nanoparticle waveguide apparatus, a nanoparticle waveguide photonic system and a method of photonic transmission employ a nearfield-coupled nanoparticle (NCN) waveguide to cooperatively propagate an optical signal. The nanoparticle waveguide apparatus includes a first optical waveguide adjacent to a second optical waveguide, the first optical waveguide comprising an NCN waveguide having a plurality of nanoparticles. The nanoparticle waveguide photonic system further includes a nearfield coupling (NC) modulator. The method includes providing the NCN waveguides and modulating a coupling between one or both of first and second NCN waveguides and adjacent nanoparticles within one or both of the first and second NCN waveguides.
Abstract:
A nanoparticle waveguide apparatus, a nanoparticle waveguide photonic system and a method of photonic transmission employ a nearfield-coupled nanoparticle (NCN) waveguide to cooperatively propagate an optical signal. The nanoparticle waveguide apparatus includes a first optical waveguide adjacent to a second optical waveguide, the first optical waveguide comprising an NCN waveguide having a plurality of nanoparticles. The nanoparticle waveguide photonic system further includes a nearfield coupling (NC) modulator. The method includes providing the NCN waveguides and modulating a coupling between one or both of first and second NCN waveguides and adjacent nanoparticles within one or both of the first and second NCN waveguides.
Abstract:
A nanoparticle array photonic waveguide, a photonic transmission system and a method of photonic transmission compensate for optical loss in an optical signal through stimulated emission using an optical gain material in a core of composite nanoparticles. The nanoparticle array photonic waveguide includes a plurality of the composite nanoparticles arranged adjacent to one another in a row. A composite nanoparticle of the plurality includes a shell and a core. The shell includes a negative dielectric constant material that is capable of supporting an optical signal on a surface of the shell. The core is adjacent to a side of the shell opposite to the shell surface. The core includes an optical gain material (OGM) that is capable of providing optical gain to the optical signal through stimulated emission within the OGM.
Abstract:
A device for optically coupling an optical fiber (1) forming part of an optical communication system, to an optical semiconductor laser amplifier (4) having an input facet (5) and an output facet (7). The optical fiber has an end surface (2) arranged opposite to at least one of the facets. A characteristic feature of the invention is an diffraction optics element (11) arranged between the end surface of the fiber and the surface of the facet in order to adapt the nearfield of the fiber end to the nearfield of the facet surface and for providing optical filtering reducing spontaneous emission noise. Preferably the diffraction optics element is a phase hologram.
Abstract:
The invention relates to a fibre-optic Mach-Zehnder Interferometer for measuring such as change in length. Two light conducting fibres (1,2) are connected to a coherent light source (5). A measurement converter (6), actuated by a measurement quantity (P) changes the length of the optical path and thereby the phase angle for the light wave in one fibre (2). The phase angles for the light waves in the fibres (1, 2) are compared and a corresponding output signal (I) is fed back to compensate for the phase angle change in the measurement converter (6). To make the comparison result (I) independent of the light intensities in the light conducting fibres (1,2) these are connected to an opto-electronic directional coupler (7). This is selected such that the output signal (I) varies as the phase displacement .phi., according to the relationship: I=2.times.A.times.B.times.sin .phi., where A and B are the amplitudes of the light waves in the fibres (1,2). By using the directional coupler (7), the interferometer can be made simple and accurate. The opto-electronic coupler ( 7) allows the use of polarized light, whereby accuracy may be further improved.
Abstract:
A method of increasing the available bandwidth of a high speed modulator in which an optical signal is modulated by a microwave signal (v) along an interaction distance (L). After passing half the interaction distance (L/2) the modulating signal is pole reversed by a positive (+E) and a negative (-E) bias voltage being connected to two different sections of the interaction distance. An apparatus according the method in an optical directional coupler modulator is described.
Abstract:
A quantum device includes a resonator and a tuning structure. The tuning structure is made a material such as a chalcogenide and is positioned to interact with the electromagnetic radiation in the resonator so that a resonant mode of the first resonator depends on a characteristic of the tuning structure. The resonator is optically coupled so that a transition between quantum states associated with a defect produces electromagnetic radiation in the resonator. The characteristic of the tuning structure is adjustable after fabrication of the resonator and the tuning structure.
Abstract:
The invention relates to an optical amplification device (10) with noise filter function. A body, composed of a plurality of layers (11-15) of different materials has electrodes (16) on its opposing sides. A first (12) and a second (14) of these layers is light wave conductive and forms a directional coupler with an interaction length (2L) consisting of two coupling lengths. The other (14) of the light wave conductive layers is a travelling wave amplifier which is pumped by an electric current (I) between the electrodes (16). The dispersion of the light wave conductors varies according to different relationships, and the effective refractive index has a common value (N.sub.eff0) for the wavelength intended for amplification. A light signal (I.sub.s, I.sub.b) in the first waveguide (12) migrates transversely over to the second waveguide (14), where it is amplified and migrates back again to the first waveguide (12). At the same time there is noise filtration of the signal (I.sub.s, I.sub.b) by a passband covering said wavelength. The noise filtered away is absorbed in the end portion (l.sub.2) of the second waveguide (14), and by the light being coupled in transversely in this waveguide the amplification device (19) will be free from reflection.
Abstract:
A quantum device includes a resonator and a tuning structure. The tuning structure is made a material such as a chalcogenide and is positioned to interact with the electromagnetic radiation in the resonator so that a resonant mode of the first resonator depends on a characteristic of the tuning structure. The resonator is optically coupled so that a transition between quantum states associated with a defect produces electromagnetic radiation in the resonator. The characteristic of the tuning structure is adjustable after fabrication of the resonator and the tuning structure.
Abstract:
A quantum wave guiding electronic switch includes a substrate which carries electron waveguides disposed in a fork-like configuration. Each of these electron waveguides is connected to a respective electron reservoir. Electrons are driven through the waveguides by voltage sources. Electrodes on the substrate generate an electric field which passes through the outgoing electron waveguides of the switch, and creates a potential difference therebetween. In one case, in which the electrons are transported ballistically, in the absence of electron scattering, this potential difference creates a phase mismatch between the outputs. An incident electron wave function having even parity is herewith switched to a quasi even electron wave function in the output that has the lowest energetic potential. When transportation is not ballistic and the electrons scattered to some extent, switching is effected by relaxation of incoming electrons to lower energy levels. The electrons will have a higher probability to be conducted through the output that has the lowest potential. The two switching cases may occur simultaneously in part. The switch is digital and requires very little control energy. Electrons within a broad energy range are switched and the switch has small or no losses.