Abstract:
The light sensor is included on an optical device having a waveguide on a base. The waveguide is configured to guide a light signal through a crystalline light-transmitting medium. The light sensor is also positioned on the base and is configured to receive the light signal from the waveguide. The light sensor includes a planar interface between two different materials. The interface is at a 45° angle relative to a direction of the light-transmitting medium.
Abstract:
There is provided a planar optical waveguide element in which an optical waveguide core comprises an inner side core having protruding portions that form a rib structure, and an outer side core that is provided on top of the inner side core and that covers circumferential surfaces of the protruding portions, wherein a refractive index of the outer side core is lower than an average refractive index of the inner side core. The structure of the planar optical waveguide element can be applied even when the core is formed from a material having a higher refractive index than that of a silica glass-based material such as silicon (Si) or silicon nitride (SixNy).
Abstract:
An optical modulation device 1 includes a supporting body 2 including a pair of grooves 2b, 2c and a protrusion 2d between the grooves, a ridge par 6 including a channel type optical waveguide capable of multi mode propagation, a first side plate part 3A formed in a first side of the ridge part 6, a second side plate part 3B formed in a second side of the ridge part, a first adhesive layer 4A adhering the first side plate part 3A and the supporting body 2, a second adhesive layer 4B adhering the second side plate part 3B and the supporting body 2, and a third adhesive layer 4C adhering the ridge part 6 and the protrusion 2d. The device 1 further includes a first electrode 7A provided on a side face 6b of the ridge part on the first groove side, and a side face 3b and an upper face 3c of the first side plate part, and a second electrode 7B provided on a side face 6c of the ridge part 6 in the second groove side, the second groove 2c and a side face 3b and an upper face 3c of the second side plate part 3B. The first electrode 7A and the second electrode 7B apply a modulation voltage modulating light propagating in the channel type optical waveguide.
Abstract:
The optical device includes a Fabry-Perot laser positioned on a base. A modulator is also positioned on the base so as to receive the output from the laser. The modulator is a Franz-Keldysh modulator that uses the Franz-Keldysh effect to modulate light signals. The laser and modulator are configured such that the modulator modulates the output from the laser and also such that the temperature dependence of the modulator tracks the temperature dependence of the laser.
Abstract:
A photocarrier-injecting variable optical attenuator that operates by injecting photocarriers into a light transmitting waveguide from a second, injection light source. The light transmitting waveguide may be defined by a ridge extending from a slab of a light transmitting medium. The light transmitting waveguide is transparent to signal light. Light emitted from the second, injection light source is optically absorbed by the light transmitting waveguide to introduce photocarriers in a plurality of configurations, thereby attenuating the signal light.
Abstract:
The optical device includes an active component on a base. The active component is a light sensor and/or a light modulator. The active component including an active medium that includes a ridge and slab regions. The ridge extends upwards from the base and is positioned between the slab regions. The ridge defines a portion of a waveguide on the base. One or more isolation trenches each extends into the slab regions of the active medium and is at least partially spaced apart from the ridge of the active medium.
Abstract:
A new High-Z optical modulator has a waveguide and electrodes on a substrate, a buffer layer with a low dielectric constant between the waveguide and the substrate, and a substance between the waveguide and the substrate with a dielectric constant lower than a dielectric constant of the substrate to the side and below the plane of the waveguide, thereby improving electro-optic field overlap, increasing RF speed and increasing transmission line impedance. The material with a dielectric constant lower than the substrate extends between the waveguide and the electrodes to a depth below the waveguide equal to or greater than the lateral distance between the waveguide and electrodes. This material may be air and may be introduced by cutting away portions of the substrate around the waveguide with a precision dicing saw. The electrodes may be placed even with the waveguide or below the waveguide on the cut-away portion of the substrate.
Abstract:
An optical system includes modulators positioned on a base. Each modulator includes a modulator waveguide that receives a light signal and guides the received light signal through the modulator. The system also includes drive electronics in electrical communication with the modulators. The drive electronics apply electrical energy to each of the modulators such that an electrical field is generated within the modulator waveguide so as to modulate one of the light signals into a modulated signal. The system includes multiple drive paths that each has a length from a contact pad on the drive electronics to a location where the electrical field is formed in one of the modulator waveguides. The modulators are configured such that the drive path length for each of the modulators is less than 0.5 mm.
Abstract:
An optical modulator device includes a body portion operative to propagate an optical mode along a longitudinal axis of the body portion, the body portion comprising a first layer disposed on a second layer, wherein the first layer includes a first p-type doped region adjacent to a first n-type doped region along the longitudinal axis of the body portion, and the second layer includes a second n-type doped region disposed on the first p-type doped region and a second p-type doped region adjacent to the second n-type doped region along the longitudinal axis of the body portion, the second p-type doped region disposed on the first n-type doped region.
Abstract:
An optical device includes a ridge on a base. The ridge includes an active medium. An active component on the base is a light sensor and/or a light modulator. The active component is configured to guide a light signal through the active medium included in the ridge. Electrical current carriers contact the lateral sides of the ridge on opposing sides of the ridge. Each of the electrical current carriers includes a carrier material that is doped so as to increase the electrical conductivity of the carrier material. The carrier material is different from the active medium.