Abstract:
On a substrate (1) comprised of a lithium niobate single crystal, there is applied an oxygen-inert diffusion barrier, for example in the form of a platinum layer (2), wherein is etched the desired strip pattern structure (6). A titanium layer (7) is then applied, before heating in a diffusion oven in the presence of an oxygen atmosphere. Thus, the titanium diffuses along the strip pattern structure (6) in the substrate wherein it forms an optical channel (8) wherein the light may be retarded and this by the action of an electrical field. The titanium surface is oxidized by heating in the presence of oxygen. The platinum strips (10, 11) remaining along the optical channel (8) form self-adjusting contacts for applying the control voltage.
Abstract:
An electro-optical filter made of a support in which an optical guide with a diffused channel waveguide and of a cover, that are created in borosilicate glass, and which includes a gap obtained by the use of suitable spacers, filled with a grating constituted of alternating strips of polymer and liquid crystal called POLICRYPS (Polymer Liquid CRYstal Polymer Slices), and with first electrodes that are coplanar to the support and next to the optical guide with a channel, that electrically control the grating making the filter tunable, and a manufacturing process.
Abstract:
An apparatus (100) that comprises a planar electro-optic modulator (110) being located on a substrate (105) and including a waveguide (115) and electrical contacts (120), The waveguide that includes first and second substantially straight segments (122, 124) and a curved segment (126) that serially end-connects the first and second substantially straight segments such that light (130) travels in a substantially anti-paralIel manner in the first and second substantially straight segments. The electrical contacts being located adjacent the first and second substantially straight segments and being connected to produce constructively adding phase modulations on an optical carrier passing through the segments.
Abstract:
An electro-optical filter made of a support in which an optical guide with a diffused channel waveguide and of a cover, that are created in borosilicate glass, and which includes a gap obtained by the use of suitable spacers, filled with a grating constituted of alternating strips of polymer and liquid crystal called POLICRYPS (Polymer Liquid CRYstal Polymer Slices), and with first electrodes that are coplanar to the support and next to the optical guide with a channel, that electrically control the grating making the filter tunable, and a manufacturing process.
Abstract:
An optoelectronic filter formed on a SOI chip comprises a silicon rib or ridge waveguide (2) formed in a silicon layer for conducting a light beam along an optical transmission path, a silica confinement layer providing optical confinement in a vertical direction, and a silicon substrate. Deep trenches (5) are etched perpendicularly to the waveguide direction up to the confinement layer (3) to form two distributed Bragg reflector (DBR) elements (15 and 16) separated by a Fabry-Perot (FP) cavity. The trenches (5) form air gaps in the optical transmission path which results in wavelength-dependent reflection of the light beam. Furthermore a heater (93) is provided for controlling the temperature of the part of the waveguide (2) between the DBR's in order to tune the passband of the filter. Such a filter can be readily tuned to the required passband, and can be manufactured using only a small number of manufacturing steps.
Abstract:
A method of optimizing for achieving maximum sensitivity for poled polymer electro-optic modulator is given by maximizing confinement of optical power in the electro-optic core layer and maximizing lateral field attenuation coefficient in the modulator cladding material.
Abstract:
An apparatus (100) that comprises a planar electro-optic modulator (110) being located on a substrate (105) and including a waveguide (115) and electrical contacts (120), The waveguide that includes first and second substantially straight segments (122, 124) and a curved segment (126) that serially end-connects the first and second substantially straight segments such that light (130) travels in a substantially anti-paralIel manner in the first and second substantially straight segments. The electrical contacts being located adjacent the first and second substantially straight segments and being connected to produce constructively adding phase modulations on an optical carrier passing through the segments.
Abstract:
An electroabsorption modulator comprises an absorption layer (7) between at least one layer of p-doped semiconductor (6) and at least one layer of n-doped semiconductor (8). The layers form a ridge waveguide structure. The thickness of the absorption layer is between 9 and 60 nm and the width of the ridge is between 4.5 and 12 microns.