Abstract:
An asymmetric waveguide pair (1440) with a differential thermal response has an optical coupling frequency that may be thermo-optically tuned. Tuning may also be accomplished by applying an electric field (1445) across a liquid crystal portion (1442) of the waveguide structure. The waveguide pair may include a grating and be used as a frequency selective coupler for an optical resonator. The differential waveguide pair may also be used as a temperature or electric field sensor, or it may be used in a waveguide array to adjust a phase relationship, e.g. in an arrayed waveguide grating.
Abstract:
The present invention concerns a multi-wavelength selective switch in the form of a directional coupler structure. The directional coupler structure comprises two waveguides, wherein the waveguides arranged exhibit different effective diffractive index. The waveguides in one section are arranged in the proximity of each other, such that an optical field in the first waveguide can overlap a second waveguide and vice versa and that in said section at least two gratings are arranged for co-directional coupling. Said gratings are arranged isolated from each other. The invention further comprises a method for switching of wavelength channels through the use of said multi-wavelength selective switch.
Abstract:
An optical modulator is disclosed. The modulator (10) is based upon an ARROW waveguide, consisting of a substrate (12), a lower cladding (16), an interference layer (18), and a core layer (20). An electronic element (14) is formed in the structure to control the free-carrier concentration in the interference layer (18). The light is coupled by gratings (22,24) into the interference layer (18), where the free-carrier concentration is controlled by the element (14), which in turn controls the modulation of the light in the interference layer (18) before it is coupled back to the core (20) layer.
Abstract:
An optical wavelength filter device comprises a first optical wavelength filter (10) of a mode conversion type and a second optical wavelength filter (12) of an interferometer type optically coupled to the first optical wavelength filter. This combination produces an increased number of transmission channels, with a reduced line width and increased tuning width, compared with the performance of the filters individually.
Abstract:
In an optical micromechanical process for changing the phase of guided waves for the purpose of modulating phase or intensity, and/or for switching guided optical waves between various outlets, and/or for deflecting optical waves, and/or for changing the resonance frequencies of frequency filters and resonators, and a measurement process for measuring very small mechanical displacements and/or mechanical forces or pressures, including the pressure of sound waves and ultrasonic waves, and/or accelerations, the distance d between a section (1') of an optical wave guide (1) in an integrated optic or fibre optic circuit and a phase-shifting element (5) separated from said section (1') by an intermediate space (4) is varied by forces (6) or by thermal expansion due to changes in temperature. The phase of the guided wave (3) is thereby modulated, and reciprocally the changes in the distance d and hence small mechanical displacements and the forces (6) which produce them are determined from the measured phase changes.
Abstract:
A device for the changing of the wavelength of light comprising a non-linear optical crystal, first and second optical waveguides that are formed in the non-linear optical crystal, and an introducing means that is positioned adjacent to the second optical waveguide, the light being incident upon the first optical waveguide and propagated within the first optical waveguide, resulting in harmonic light that satisfies the phase-matching conditions, and the harmonic light being introduced, by the introducing means, into the second optical waveguide from which the harmonic light is output.
Abstract:
광신호의 위상을 변환시키는 광전 소자를 포함하는 반도체 집적회로를 제공한다. 본 발명에 따른 반도체 집적회로는 기판 상에 배치된 반도체 패턴을 포함한다. 반도체 패턴은 광도파로부 및 광도파로부 양측에 배치된 리세스부들을 포함한다. 광신호가 투과하는 광도파로부의 단면적을 감소시켜 고속으로 동작하고 고집적화 및/또는 저소비전력화에 최적화된 광전 소자를 포함하는 반도체 집적회로를 구현할 수 있다.