摘要:
An optical modulator for modulating light emitted from a signal light source has a substrate having electrooptic effect, an optical waveguide of a Mach-Zehnder type formed on the substrate, an electrode formed on the substrate to control light propagated in the optical waveguide, an interference light generating means for making radiation light radiated from the optical waveguide and signal light leaking from the optical waveguide interfere with each other to generate interference light, and emitting the interference light from an end surface of the substrate, a photo-detector for monitoring the interference light of the radiation light and the signal light, and a signal controlling circuit for controlling an operating point of the optical modulator according to a change of the interference light monitored by the photo-detector It is thereby possible to prevent degradation of a distinction ratio due to a shift of the operating point of the optical modulator so as to allow stable optical modulation, while facilitating a design of the mechanism of the optical modulator.
摘要:
An optical modulator for modulating light emitted from a signal light source has a substrate having electrooptic effect, an optical waveguide of a Mach-Zehnder type formed on the substrate, an electrode formed on the substrate to control light propagated in the optical waveguide, a light guiding unit for guiding light radiated or leaking from the optical waveguide, an interference light generating means for making light emitted from the light guiding unit and signal light leaking from the optical waveguide interfere with each other to generate interference light, and for emitting the interference light from an end surface of the substrate, a photo-detector for monitoring the interference light obtained by the interference light generating means, and a signal controlling circuit for controlling an operating point of the optical modulator according to a change of the interference light monitored by the photo-detector, thereby stably controlling the operating point of the optical modulator while facilitating a design of the mechanism.
摘要:
An optical waveguide device including a package housing having an element mounting surface, an element inserting groove opening to the element mounting surface, and a cutout as a space opening to an inner surface of the element inserting groove; and an optical waveguide element having a dielectric substrate, an optical waveguide formed in a surface of the dielectric substrate, and an electrode formed over the surface of the dielectric substrate, the optical waveguide element being inserted and fixed in the element inserting groove of the package housing by using an adhesive. The cutout opens also to the element mounting surface. In applying the adhesive to the bottom surface of the element inserting groove and inserting the optical waveguide element into the element inserting groove, the adhesive flows into the cutout and is prevented from flowing up to the element mounting surface. Further, a working space for application of the adhesive to the bottom surface of the element inserting groove can be ensured by the cutout.
摘要:
Disclosed herein is an optical modulator module including an optical waveguide structure of a Mach-Zehnder type, for example, an electrode for switching a coupling mode where an output beam is obtained from the optical waveguide structure and a leakage mode where a leakage beam deflects from the optical waveguide structure, a photodetector having a photodetecting surface for receiving the leakage beam, and a mechanism for converting a beam parameter of the leakage beam so as to prevent close contact of the photodetecting surface with the optical waveguide structure. The optical modulator module allows monitoring of optical power by the use of the leakage beam and is improved in manufacturability.
摘要:
An optical waveguide module including a metal package having a bottom surface formed with a chip insertion groove, and a waveguide chip inserted and fixed in the chip insertion groove. The waveguide chip has an optical waveguide formed on a substrate having an electro-optic effect. A signal electrode is formed on the optical waveguide, and a ground electrode is formed on the substrate. The ground electrode is connected to the metal package through first and second ribbons respectively located in the vicinity of first and second bent portions of the signal electrode.
摘要:
An object of the invention is to provide a polarization scrambler wherein the polarization of linearly polarized signal light can be rotated to facilitate obtaining a minimum degree of polarization, and wherein scrambling operation is possible even if signal light of optional polarization states is input. Accordingly with the polarization scrambler, a polarization rotation section is provided on an input side on a chip on which is formed an optical waveguide, and a polarization scrambling section is provided on an output side. With the polarization rotation section, the polarization of linearly polarized signal light which is transmitted by the optical waveguide is rotated by means of an acousto-optic effect due to an elastic surface wave generated by an electrode, so as to become 45.degree. with respect to a vertical direction of the optical waveguide. With the polarization scrambling section, the polarization of the signal light from the polarization rotation section is scrambled in accordance with a modulation signal.
摘要:
A multiaxial optical coupler for use in a device using an LiNbO3 substrate, which is reliable over a wide temperature range and capable of reducing coupling loss. A capillary has a plurality of linear through holes formed therethrough in a manner each inclined with respect to the central axis of the capillary such that the extension line of the central axis of the linear through hole extends through the center of a lens. A plurality of optical fibers are inserted into the linear through holes, respectively. This construction enables the optical axis of an optical beam emitted from each of the optical fibers within the capillary to pass through the center of the lens and reach the end face of a corresponding one of the optical waveguides. Similarly, the construction enables the optical axis of an optical beam emitted from the end face of each of the optical waveguides on the substrate to pass through the center of the lens and reach a corresponding one of the optical fibers within the capillary. The central axis of each of the linear guide holes is slightly inclined with respect to the optical axis of the lens. However, this inclination angle causes very little optical coupling loss.
摘要:
The invention is directed to the provision of a method for generating a model for a preoperative simulation, wherein the method includes: a first step of constructing volume data for necessary organs by acquiring geometrical information from a medical image; a second step of manipulating the volume data to reposition and reorient an operator-designated organ to achieve a position and orientation appropriate for a surgical operation; a third step of generating a blood-vessel model, depicting a blood vessel to be joined to the designated organ, so as to match the position and orientation of the designated organ; a fourth step of generating volume data by forming a fat model of prescribed thickness around a prescribed organ contained in the earlier constructed volume data, after the blood-vessel model has been joined to the designated organ; a fifth step of thereafter meshing the organ represented by the generated volume data; a sixth step of manipulating a template model of a prescribed shape by using a template, and arranging the template model around the generated blood-vessel model; and a seventh step of generating a line-segment model based on the thus arranged template model.
摘要:
An optical modulator comprises a substrate having an electro-optical effect, an optical waveguide formed in the substrate, a buffer layer provided above the optical waveguide, a semiconductor film provided above the buffer layer and having an aperture at a top of the optical waveguide, and an electrode provided above the buffer layer and electrically coupled to the semiconductor film.
摘要:
A wavelength selective optical switch of the present invention separates a WDM light emitted from an input port of an input and output optical system, according to wavelengths, by a diffraction grating, and thereafter, condenses the lights of respective wavelengths on MEMS mirrors respectively corresponding to the respective wavelengths, in a mirror array, to reflect them by a condenser optical system, to thereby switch optical paths for the respective lights. The condenser optical system is configured by combining a plurality of lenses whose focal distances are different from each other, and positions in an optical axis direction of the lenses are adjustable by a slide mechanism. Thus, despite an error in the focal distances of the condenser lenses, in a mounting angle of a spectral element or the like, a beam pitch at the condensing positions of the lights of respective wavelengths can be coincident with a mirror pitch in the mirror array.