摘要:
An optical fiber includes an entrance face that is optically coupleable with a device for transmitting a light beam through the optical fiber. The entrance face includes a core region and a cladding region surrounding the core region. The cladding region is at least partially covered with a coating, which is made of metal, for example. That is, the coating is formed over a whole area of the cladding region or the coating is formed on an area of the cladding region defined in a vicinity of the core region. The coating has a mirror surface to increase the reflectivity thereof and enhances the reflectivity of the entrance face.
摘要:
An apparatus for facilitating the alignment of an optical fibre to an integrated waveguide component comprising a substrate having an integral waveguide comprises a mask arranged to be disposed between the optical fibre and the integrated waveguide component, wherein the mask includes an aperture extending therethrough. In use, the aperture is substantially exactly aligned with the waveguide thereby to permit light from the optical fibre to be transmitted to the waveguide but to substantially prevent light from the optical fibre from passing around the waveguide and/or through the substrate.
摘要:
An improved method and system of aligning an optical fiber or optical fiber array to an optical circuit device couples an optical signal source and an optical measuring device to the optical fiber array, the other side of which array is coupled to the same side of the optical circuit device, thereby forming an initial U-shaped optical path from the optical signal source to the optical fiber array to the optical circuit device to the optical fiber array and to the optical measuring device. The optical path is adjusted until the optical measuring device finds a characteristic of the optical signal to be satisfactory. At that time, the final alignment may be fixed or made permanent. The characteristic of the optical signal may include, for example, the intensity of the optical signal, which is preferably at a maximum or the insertion loss which is preferably at a minimum.
摘要:
An optical coupler operates as a reflective splitter for predetermined wavelengths and operates as an optical transmissive combiner and an optical transmissive splitter for other wavelengths. Wavelength-selective reflective elements reflect the predetermined wavelength from an output of a transmissive coupling element and pass other wavelengths to another the transmissive coupling element. The optical coupler also includes wavelength-selective coupling elements to transfer the predetermined wavelength between outputs of transmissive coupling elements and inhibit transmission of other wavelengths therebetween. The wavelength-selective coupling elements can be long-period gratings with a resonance wavelength at the predetermined wavelength. The wavelength-selective reflective elements can be Bragg gratings with a grating spacing of one-half the predetermined wavelength.
摘要:
An optical coupler operates as a reflective splitter for predetermined wavelengths and operates as an optical transmissive combiner and an optical transmissive splitter for other wavelengths. Wavelength-selective reflective elements reflect the predetermined wavelength from an output of a transmissive coupling element and pass other wavelengths to another the transmissive coupling element. The optical coupler also includes wavelength-selective coupling elements to transfer the predetermined wavelength between outputs of transmissive coupling elements and inhibit transmission of other wavelengths therebetween. The wavelength-selective coupling elements can be long-period gratings with a resonance wavelength at the predetermined wavelength. The wavelength-selective reflective elements can be Bragg gratings with a grating spacing of one-half the predetermined wavelength.
摘要:
A method for producing an optical module assembly includes the steps of illuminating an optical surface of an optical device included in an optical module, acquiring an image of the optical surface of the optical module, obtaining a position of an end surface of the optical fiber with respect to the optical surface of the optical device based upon the image of the optical surface, and positioning the end surface of said optical fiber at the position thus obtained. An apparatus for carrying out the method is also disclosed.
摘要:
This invention relates to a novel apparatus and method capable of aligning an optical fiber for injection with a high power laser beam. More particularly, this apparatus and method use a camera coupled to a monitor to align the fiber tip coincident with the laser beam focus, without damaging the fiber jacket or cladding.
摘要:
An optical module is used for communication over optical waveguides. To couples laser light to or from the optical waveguide (3) with as little loss as possible, the laser diode (2) must be precisely aligned with respect to the core region (22) of the end face (14) of the optical waveguide. In conventional modules, this requires costly and complicated mechanical couplers, which nevertheless do not have the necessary long-term stability. To solve the problem of how to provide a low-cost laser-to-fiber coupling which exhibits long-term stability, the optical module (1) is provided with a control facility (16, 17, 18) which controls the coupling of light on the basis of measurements of the differences in reflection factor between the core region (22) and the cladding region (23) of the end face of the optical waveguide (3). For this measurement and control, use can be made of low-priced components employed in CD players.