Abstract: The invention relates to an apparatus and a method for evaluating spectral properties of a measurement object. It comprises a plurality of light emission units, each emitting light with a predetermined emission spectrum and having a respective output configured for emitting the light with the predetermined emission spectrum onto the measurement object, an optical spectrograph having an input port adapted to receive light from the measurement object and a diffraction unit adapted to distribute different wavelengths of the received light to different output ports comprising the optical detectors, wherein the diffraction unit is adapted to distribute said received light to the respective output ports such that the lights in the respective output port have different wavelengths at different diffraction orders; a signal identification unit adapted to identify which of the light emission units contribute to the respective light in the respective output ports.

Abstract: The invention relates to an apparatus and a method for evaluating spectral properties of a measurement object. It comprises a plurality of light emission units, each emitting light with a predetermined emission spectrum and having a respective output configured for emitting the light with the predetermined emission spectrum onto the measurement object, an optical spectrograph having an input port adapted to receive light from the measurement object and a diffraction unit adapted to distribute different wavelengths of the received light to different output ports comprising the optical detectors, wherein the diffraction unit is adapted to distribute said received light to the respective output ports such that the lights in the respective output port have different wavelengths at different diffraction orders; a signal identification unit adapted to identify which of the light emission units contribute to the respective light in the respective output ports.

Abstract: A method includes calculating destructive interference conditions between two linearly s-polarized waves and between two linearly p-polarized waves, respectively, in dependence on varying parameters of the s- and p-polarized waves, representing the destructive interference conditions in a diagram, setting an optical radiation field to be used in the optical imaging process, and comparing the optical radiation field with the diagram.

Abstract: A method includes calculating destructive interference conditions between two linearly s-polarized waves and between two linearly p-polarized waves, respectively, in dependence on varying parameters of the s- and p-polarized waves, representing the destructive interference conditions in a diagram, setting an optical radiation field to be used in the optical imaging process, and comparing the optical radiation field with the diagram.

Abstract: A resonator structure containing an active layer is subdivided into at least two sections in which mode spacings differ from one another by 7 to 10 percent on account of different length dimensions or as a result of grating structures provided therefor. Photonic crystals are integrated as longitudinal and, if appropriate, as lateral boundaries of the resonator structure. Variation of the currents in the sections enables the laser to be tuned in a wide wavelength range.

Abstract: In the method and the arrangement, a ratio (p2/P3)—which is independent of the total optical power of the laser (1)—between a power (p2) essentially containing only the wavelength (&lgr;) to be stabilized, which power is filtered out from a portion (P2) of the total power (P0), and an additional portion (P3) is measured and compared to a desired value (S0), and, given a deviation from the desired value (S0), the temperature of the laser (1) is controlled to the desired value (S0).

Abstract: A phased array with several optical waveguides with optical lengths that increase from waveguide to waveguide has a first arrangement for modifying the optical length of waveguides with the modification increasing from waveguide to waveguide in one direction and a second arrangement for producing a modification of the optical length with the modification decreasing from waveguide to waveguide in the one direction.

Abstract: An arrangement for the implementation of an add/drop method in optical signals transmitted wavelength-division multiplex in which an interferometer includes a divider for generating signal parts from an optical signal which are forwarded to the two interferometer branches, a superposition device for superimposing the signal parts from the branches, respective add/drop means in each branch, and a phase delay in one branch.

Abstract: A device for planar light-guiding layers arranged one above the other and having an infeed end face for coupling a respective light beam in the layer and an outfeed end face for coupling light from each of the layers, each of the layers being provided with an arrangement for deflecting light coupled in one of the end faces toward the other end faces so that a plurality of individual light beams can be converted into a more compact arrangement of a light beam or a light beam of a larger cross section can be converted into a plurality of smaller sub-beams having a smaller cross section.

Abstract: A device for the wavelength-related stabilization of an optical filter, particularly a wavelength-division multiplexer/demultiplexer, comprises a Bragg grating arranged in the proximity of the filter and a waveguide for supplying a fixed optical reference wavelength to the grating. The grating is regulated to either a maximum transmission and minimum reflection or a minimum transmission and maximum reflection of the reference wavelength by controlling the temperature of the grating and of the filter.

Abstract: An optical coupling arrangement consist of a pair of strip-type optical waveguide end segments extending alongside one another and having ends arranged at a small distance from each other so that crosstalk can occur. In order to suppress the crosstalk at a point spaced from the ends of each of the end segments, the segments are arranged so that the distance from one another increases from the distance at the end as the distance from the end along said segments increases.

Abstract: A tonable optical arrangement is composed of two or more strip waveguides disposed on a substrate with the waveguides having different lengths and at least one having a controllable phase shifting device for controlled generation of a phase shift in that particular waveguide. This arrangement is useful for WDM transmission, for wavelength switching or for wavelength conversion.

Abstract: An optical grating being formed by a waveguide branching structure having a single infeed end face for infeeding an optical wave to be coupled into the grating, said branching structure is composed of a strip-like optical waveguide that proceeds from the infeed end face in a tree-like branching fashion and ends at the outfeed end faces, the distance between the infeed end face and each of the outfeed end faces can be the same or be different, as desired. The outfeed end faces can also be arranged to extend obliquely to the propagation direction of the optical wave being propagated in the grating.

Abstract: An arrangement for an integrated optical spectrometer having an optical film waveguide and a focusing optical grating with grating lines extending perpendicular to a plane of the film waveguide characterized by the grating having a fixed grating constant so that adjustment and contrast problems can be avoided. The new arrangement can take the form of a film waveguide in coaction with a ribbed waveguide disposed thereon, with the grating being formed in the edges of the ribbed waveguide.

Abstract: An integrated optical arrangement for bidirectional optical message and signal transmission characterized by a common substrate having integrated thereon, a semiconductor laser, an optical detector and a direction selective coupling arrangement which coupling arrangement has a first port coupled to the laser, a second port coupled to the detector and a third port arranged for coupling light in and out of the arrangement with a first wavelength from the laser passing from the first port to the third port and the third port passing a second wavelength to the second port for detection. The arrangement further includes a wavelength selective filter being disposed in a waveguide extending to the second port for blocking light of the first wavelength but being transmissive to light of the second wavelength. The coupling arrangement can either be an optical directional coupler or a y-shaped waveguide fork.

Abstract: An arrangement for controlling or regulating the emission wavelength and emitted optical power of a semiconductor laser is provided in optically integrated fashion. The optical power of the laser is at least partially supplied to an optical detector device and to a wavelength selective optical filter device. That part of the supplied power which passes through the filter device is conducted to another opto-electrical detector device. As a result of the two diodes, the optical power and the emission wavelength of the laser are simultaneously measured, whereby two control signals for the injection current of the laser are obtained.

Abstract: A cut-off filter for integrated optics, which filter has a form of a relief-like surface grating on a film or strip waveguide, is formed in a portion of the strip waveguide having a reduced layer thickness and is formed with a constant corrugation depth. Preferably, the formation of the grating is done in a simple way by simultaneously etching a depression in the strip waveguide and also etching the grating structure onto the floor of the depression with the assistance of anisotropically acting etchants.

Abstract: A method for manufacturing a surface grating on a mesa structure of a laser includes etching a substrate surface by wet-chemical etching to form a surface grating of defined grating constant, masking regions of the surface grating corresponding to the mesa structure, and further etching the unmasked regions to transfer the surface grating to the more deeply situated surface regions of the mesa structure while retaining substantially the same grating constant.