Abstract: Object To provide an optical waveguide device capable of suppressing an excess optical loss at a low level. Means An optical waveguide device including a substrate having an electro-optic effect, an optical waveguide 1 formed on the substrate, and a control electrode having a signal electrode 2 and ground electrodes 3 and 4 for controlling light waves that propagate through the optical waveguide, in which the signal electrode 2 has, in an intersection portion in which the signal electrode 2 is disposed on the optical waveguide 1, a narrow portion at which a width of the signal electrode 2 is narrower than those of portions before and after the intersection portion.

Abstract: Provided is an optical modulator in which low-voltage drive and a stable modulation characteristic are secured over a wide bandwidth.

Abstract: Provided is an optical modulator in which even in a case where an optical waveguide and a control electrode are highly integrated, a distortion due to stress acting on the optical waveguide from lead-out wiring of a signal electrode is mitigated and occurrence of a temperature drift or the like is suppressed.

Abstract: An optical waveguide element module decreases discontinuity of electrical connection between an optical waveguide element and a relay substrate, without wire-bonding using long wires. An edge shape L of the signal electrode side of the ground electrode is surrounded by two shapes (L1, L2). Shape L1 is obtained by connecting an input end of the control electrode to a location where a space between the ground electrodes becomes W2. Shape L2 is such that an impedance change of the control electrode from the input end to the location at which the space between the ground electrodes becomes W2 is constant or continuously changes. A space between grounding wires connecting the ground electrodes of the element and ground lines of the relay substrate is larger than a space between the ground electrodes. In an embodiment, a terminal substrate and an output end of the control electrode are connected.

Abstract: An optical device is provided, which includes: an optical waveguide provided in a substrate having an electro-optic effect; a signal electrode provided on the substrate and above the optical waveguide; and a peeling prevention film which is provided on at least a part of an outer peripheral portion of the substrate and at a position spaced apart from the signal electrode, and also serves as a ground electrode.

Abstract: Object To provide an optical waveguide device capable of suppressing an excess optical loss at a low level. Means An optical waveguide device including a substrate having an electro-optic effect, an optical waveguide 1 formed on the substrate, and a control electrode having a signal electrode 2 and ground electrodes 3 and 4 for controlling light waves that propagate through the optical waveguide, in which the signal electrode 2 has, in an intersection portion in which the signal electrode 2 is disposed on the optical waveguide 1, a narrow portion at which a width of the signal electrode 2 is narrower than those of portions before and after the intersection portion.

Abstract: Provided is an optical modulator in which even in a case where an optical waveguide and a control electrode are highly integrated, a distortion due to stress acting on the optical waveguide from lead-out wiring of a signal electrode is mitigated and occurrence of a temperature drift or the like is suppressed.

Abstract: A system includes first, second, and third apparatuses. The second apparatus converts a first control-command received from the first apparatus to second control-commands compatible with the third apparatus, requests the third apparatus to perform the second control-commands, and notifies the first apparatus of a normal finish of the first control-command when all the second control-commands have finished normally, so that the first apparatus updates a first status of the third apparatus that is held by the first apparatus.

Abstract: Provided is an optical modulator in which low-voltage drive and a stable modulation characteristic are secured over a wide bandwidth.

Abstract: Provided is an optical waveguide element including a first interactive part, a first EO substrate line, a second interactive part, and a second EO substrate line. A relay substrate unit includes a first relay substrate line, a second relay substrate line, and a loss adjusting part. The loss adjusting part is provided to the relay substrate line in a combination in which an electrical loss is low so that an electrical loss in a combination of the first EO substrate line and the first relay substrate line, and an electrical loss in a combination of the second EO substrate line and the second relay substrate line become approximately the same as each other.

Abstract: An optical device is provided, which includes: an optical waveguide provided in a substrate having an electro-optic effect; a signal electrode provided on the substrate and above the optical waveguide; and a peeling prevention film which is provided on at least a part of an outer peripheral portion of the substrate and at a position spaced apart from the signal electrode, and also serves as a ground electrode.

Abstract: The purpose is to provide an optical waveguide element module which is to prevent deterioration of electric characteristics by decreasing discontinuity of electrical connection between an optical waveguide element and a connecting substrate (a relay substrate or a terminal substrate) without wire-bonding using long wires.

Abstract: Provided is an optical pulse-generator and an optical pulse-generating method which are capable of generating an optical pulse train with an arbitrary pattern. An optical pulse-generator 1 includes a first optical modulator 21 configured to modulate input light using a first modulation signal SIG1 to generate optical pulses, a second optical modulator 41 configured to perform a modulation operation using a second modulation signal SIG2 synchronizing with the first modulation signal SIG1 and having a signal pattern that is set to output only specific part of the optical pulses, and a dispersion compensator 30 configured to compensate a chirp of the optical pulse output from the first optical modulator 21.

Abstract: An optical device includes a light element that outputs first output light and second output light, a first light-receiving portion that converts the first output light into a first electrical signal, a second light-receiving portion that converts the second output light into a second electrical signal, a substrate having a plurality of surfaces, a first electrode which is provided on the substrate and is connected to the first light-receiving portion, and a second electrode which is provided on the substrate and is connected to the second light-receiving portion, and a part of the first electrode is disposed on a surface different from a surface on which the second electrode is disposed.

Abstract: [Task] Reduction in crosstalk between signal electrodes. [Means for Resolution] An optical modulator 1 includes a relay substrate 3 including a substrate portion 30, and signal electrodes 31 and 32, and a ground electrode 33 which are provided on the substrate portion 30, and an optical waveguide substrate 4 including an electrode-optical substrate 40, signal electrodes 431 and 432, and an optical waveguide 42 which are provided on the electro-optical substrate 40.

Abstract: A system includes first, second, and third apparatuses. The second apparatus converts a first control-command received from the first apparatus to second control-commands compatible with the third apparatus, requests the third apparatus to perform the second control-commands, and notifies the first apparatus of a normal finish of the first control-command when all the second control-commands have finished normally, so that the first apparatus updates a first status of the third apparatus that is held by the first apparatus.

Abstract: The present invention provides an electro-optic element including an optical waveguide that is constituted of a core layer made of an inorganic compound and a first clad layer and a second clad layer which are laminated so as to sandwich the core layer therebetween and are made of a dielectric material, and a first electrode layer and a second electrode layer that are formed so as to sandwich the core layer therebetween, the first clad layer, and the second clad layer, in which at least one of the first clad layer and the second clad layer contains an organic dielectric material having an electro-optic effect, and refractive indices of the first clad layer and the second clad layer are lower than a refractive index of the core layer.

Abstract: [Task] Reduction in crosstalk between signal electrodes. [Means for Resolution] An optical modulator 1 includes a relay substrate 3 including a substrate portion 30, and signal electrodes 31 and 32, and a ground electrode 33 which are provided on the substrate portion 30, and an optical waveguide substrate 4 including an electrode-optical substrate 40, signal electrodes 431 and 432, and an optical waveguide 42 which are provided on the electro-optical substrate 40.

Abstract: Provided is an optical waveguide element including a first interactive part, a first EO substrate line, a second interactive part, and a second EO substrate line. A relay substrate unit includes a first relay substrate line, a second relay substrate line, and a loss adjusting part. The loss adjusting part is provided to the relay substrate line in a combination in which an electrical loss is low so that an electrical loss in a combination of the first EO substrate line and the first relay substrate line, and an electrical loss in a combination of the second EO substrate line and the second relay substrate line become approximately the same as each other.

Abstract: The optical modulator includes optical modulation units. The plurality of optical modulation units is disposed in parallel on the same substrate. One input waveguide branches off to be connected to the Mach-Zehnder type optical waveguide of each optical modulation unit, and an entire optical waveguide is formed such that outputs from the Mach-Zehnder type optical waveguides are combined and output through one output waveguide. A modulation signal with the same intensity is applied to a modulation electrode of each optical modulation unit. In at least some of the optical modulation units, mechanical structures including the modulation electrodes of the optical modulation units are configured such that an amplitude value of an optical output modulated by the modulation signal of the optical modulation unit is ½n (n is a natural number) of a maximum amplitude value in other optical modulation units.