30 results about "Prism coupler" patented technology

A coupling arrangement for allowing multiple wavelengths to be coupled into and out of a relatively thin silicon optical waveguide layer utilizes a diffractive optical element, in the form of a volume phase grating, in combination with a prism coupling structure. The diffractive optical element is formed to comprise a predetermined modulation index sufficient to diffract the various wavelengths through angles associated with improving the coupling efficiency of each wavelength into the silicon waveguide. The diffractive optical element may be formed as a separate element, or formed as an integral part of the coupling facet of the prism coupler.

A wafer-level testing arrangement for opto-electronic devices formed in a silicon-on-insulator (SOI) wafer structure utilizes a single opto-electronic testing element to perform both optical and electrical testing. Beam steering optics may be formed on the testing element and used to facilitate the coupling between optical probe signals and optical coupling elements (e.g., prism couplers, gratings) formed on the top surface of the SOI structure. The optical test signals are thereafter directed into optical waveguides formed in the top layer of the SOI structure. The opto-electronic testing element also comprises a plurality of electrical test pins that are positioned to contact a plurality of bondpad test sites on the opto-electronic device and perform electrical testing operations. The optical test signal results may be converted into electrical representations within the SOI structure and thus returned to the testing element as electrical signals.

An optical coupler for parallel coupling from a single mode optical fiber, or fiber ribbon, into a silicon-on-insulator (SOI) waveguide for integration with silicon optoelectronic circuits. The optical coupler incorporates the advantages of the vertically tapered waveguides and prism couplers, yet offers the flexibility of planar integration. The optical coupler may be fabricated using wafer polishing technology or grayscale photolithography. The optical coupler can be packaged using epoxy bonding to form a fiber-waveguide parallel coupler or connector.

The present invention relates to a KBBF family nonlinear optical crystal-prism coupler and its method of fabrication. The coupler comprises: a KBBF family crystal with two smooth surfaces; transition layers each of which is deposited on respective one of the two smooth surfaces of the KBBF family crystal; and a pair of prisms each of which optically contacts with respective one of the activated transition layers. The present invention further provides a KBBF family nonlinear optical crystal-prism coupler that comprises: a KBBF family crystal with two smooth surfaces; a pair of prisms each of which has a smooth surfaces; first transition layers each of which is deposited on respective one of the two smooth surfaces of the KBBF family crystal; and second transition layers each of which is deposited on a smooth surface of respective one of the pair of prisms, wherein the first and second transition layers are integral by optical contact. The coupling between the KBBF family crystal and the prisms is achieved by optical contact through transition layers to improve bonding strength.

Prism coupling methods disclosed herein are directed to determining a stress characteristic of an original IOX article having a buried IOX region with a buried refractive index profile that is problematic in the sense that it prevents the original IOX article from being measured using a prism coupler system. The methods include modifying the buried IOX region of the original IOX article in a surface portion of the buried IOX region to form a modified IOX article having an unburied refractive index profile that allows the modified IOX article to be measured using a prism coupler. The methods also include measuring a mode spectrum of the modified IOX article using the prism coupler system. The methods further include determining one or more stress characteristic of the original IOX article from the mode spectrum of the modified IOX article.

The invention provides a prism-grating optical waveguide coupler and an optical waveguide device with the optical waveguide coupler. The optical waveguide coupler comprises a prism, a grating and a mode convertor, wherein the grating and the mode converter are manufactured on a plane waveguide. Incident light in free space can be coupled to the plane waveguide and converted to be in the ridge type waveguide mode. The prism is a discrete component, and an air gap is reserved between the prism and the grating so that total emission of the incident light in the free space can be achieved on the bottom face of the prism to generate an evanescent field. The grating is manufactured on the plane waveguide, disturbance is caused to the evanescent field through diffraction, and therefore optical energy is coupled in the plane waveguide. The mode convertor is provided with a ridge-shaped portion gradually narrowing down so that the coupled waveguide mode can be converted into a waveguide mode in a ridge-shaped waveguide. The optical waveguide coupler can effectively couple the light in the free space to the waveguide with the high refractive index such as the SOI, the problems of coupling of the ridge type waveguide and mode conversion are effectively solved, and the optical waveguide coupler has the advantages of both a prism coupler and a grating coupler, and is wide in application range, easy to manufacture and convenient to machine.

A multi-pass prism coupler utilizing total dihedral angle, comprising a first coupling prism, a nonlinear frequency conversion crystal and a second coupling prism arranged in sequence along the light beam irradiation direction, the nonlinear frequency conversion crystal is flat, and the first coupling prism The prism and the second coupling prism are respectively arranged on two opposite board surfaces of the nonlinear frequency conversion crystal; After the multi-path total internal reflection is realized along the optical path between the two reflection areas, it is output through the first coupling prism or the second coupling prism. The coupler provided by the embodiment of the present invention utilizes the total internal dihedral angle to cause multiple reflections of the incident light in the nonlinear frequency conversion crystal, doubles the effective length of the frequency doubling crystal, and further improves the conversion efficiency and output power of the frequency doubling light.

The invention relates to an optical waveguide parameter testing clamp which comprises a base, an optical waveguide clamp, a longitudinal guiderail, a set of fixed transverse guiderails, an input prism clamp, a set or multiple sets of slide transverse guiderails and an output prism clamp. The fixed transverse guiderails, the longitudinal guiderails and the optical waveguide clamp are mounted on the base. The slide transverse guiderails are mounted on the longitudinal guiderail. The input prism clamp is mounted on the fixed transverse guiderails. The output prism clamp is mounted on the slide transverse guiderails. The optical waveguide clamp is located at the position close to the tail ends of the fixed transverse guiderails and the slide transverses guiderails. The output prism clamp can be replaced by a CCD camera. The optical waveguide parameter testing clamp can be used for clamping prism couplers, to-be-tested waveguides, detectors and the like. In addition, the optical waveguide parameter testing clamp is applicable to various waveguide parameter measuring methods, novel and simple in structure, high in testing precision, good in repeatability, convenient to operate, wide in application range, and the like.