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: [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: An object is to provide a light modulator capable of highly accurate bias control by maintaining main output characteristics and monitor characteristics in an appropriate relationship and matching a bias point determined using monitor output and an optimal bias point of main output. The light modulator includes an optical waveguide formed in a substrate having a thickness of 20 ?m or less, in which the optical waveguide includes a Mach-Zehnder waveguide and an output waveguide for guiding signal light from a multiplexing portion of the Mach-Zehnder waveguide and outputting the signal light outside the substrate and monitoring means that monitors signal light or radiated light. Leaked light-removing means for removing some of the radiated light propagating through the output waveguide from the output waveguide and emitting the radiated light outside the substrate is provided in the light modulator.

Abstract: An object of the present invention is to provide an optical waveguide element module where the bonding wires can be prevented from disengaging or disconnecting so as to provide high reliability. Another object is to provide an optical waveguide element module that can be made compact and where an increase in the manufacturing cost can be minimized.

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 object is to provide a light modulator capable of highly accurate bias control by maintaining main output characteristics and monitor characteristics in an appropriate relationship and matching a bias point determined using monitor output and an optimal bias point of main output. The light modulator includes an optical waveguide formed in a substrate having a thickness of 20 ?m or less, in which the optical waveguide includes a Mach-Zehnder waveguide and an output waveguide for guiding signal light from a multiplexing portion of the Mach-Zehnder waveguide and outputting the signal light outside the substrate and monitoring means that monitors signal light or radiated light. Leaked light-removing means for removing some of the radiated light propagating through the output waveguide from the output waveguide and emitting the radiated light outside the substrate is provided in the light modulator.

Abstract: An object of the present invention is to provide an optical waveguide element module where the bonding wires can be prevented from disengaging or disconnecting so as to provide high reliability. Another object is to provide an optical waveguide element module that can be made compact and where an increase in the manufacturing cost can be minimized.

Abstract: An optical waveguide device having a Mach-Zehnder type waveguide formed on a substrate is provided in which a slope of two waveguides input to an optical coupler on an output side of the Mach-Zehnder type waveguide is 0 degrees, a waveguide of the optical coupler after being coupled by the optical coupler is a multi-mode waveguide, and the waveguide which is output from the optical coupler is a three-branched waveguide including an output main waveguide and two output sub waveguides interposing the output main waveguide therebetween.

Abstract: An optical modulator is provided which can compensate for a bias shift between an output light and a monitoring light of the optical modulator and which has a configuration capable of being reduced in size with a simple structure. The optical modulator comprises a substrate that has an electro-optical effect, an optical waveguide that includes a Mach-Zehnder type optical waveguide formed in the substrate, a modulation electrode that modulates light waves propagating in the optical waveguide, an optical fiber that guides an output light from the optical waveguide, light collecting means for collecting two radiated lights from the Mach-Zehnder type optical waveguide toward a single optical receiving element, and light intensity ratio adjusting means for adjusting a light intensity ratio of the two radiated lights received by the optical receiving element.

Abstract: An optical modulator comprises a substrate 4 having a thickness of 20 ?m or less and an electro-optic effect, a reinforcing substrate 6 holding the substrate 4 thereon and a resin layer 5 disposed between the substrate and the reinforcing substrate, in which the substrate 4 includes optical waveguides 1 and 2 and control electrodes 3 and 31 which control light waves propagating through the optical waveguide, in which the optical waveguides include at least two optical waveguides 1 separated from each other, and in which the control electrodes 31 disposed between the two optical waveguides are configured to include two electrodes 31 disposed along each optical waveguide, and a thin line 8 conducting the two electrodes 31 at a same potential.

Abstract: An optical waveguide device is provided which can efficiently guide undesired light to the outside of a substrate or the outside of the overall optical waveguides even when optical waveguides are integrated. In the optical waveguide device, an optical waveguide is formed on a substrate, the optical waveguide includes a main waveguide in which signal light propagates and an undesired-light waveguide for removing undesired light from the main waveguide, and the undesired-light waveguide is separated by the main waveguide interposed therebetween at an intersection in which the undesired-light waveguide and the main waveguide intersect each other.

Abstract: An optical modulator comprises a substrate 4 having a thickness of 20 ?m or less and an electro-optic effect, a reinforcing substrate 6 holding the substrate 4 thereon and a resin layer 5 disposed between the substrate and the reinforcing substrate, in which the substrate 4 includes optical waveguides 1 and 2 and control electrodes 3 and 31 which control light waves propagating through the optical waveguide, in which the optical waveguides include at least two optical waveguides 1 separated from each other, and in which the control electrodes 31 disposed between the two optical waveguides are configured to include two electrodes 31 disposed along each optical waveguide, and a thin line 8 conducting the two electrodes 31 at a same potential.

Abstract: An optical modulator is provided which can compensate for a bias shift between an output light and a monitoring light of the optical modulator and which has a configuration capable of being reduced in size with a simple structure. The optical modulator comprises a substrate that has an electro-optical effect, an optical waveguide that includes a Mach-Zehnder type optical waveguide formed in the substrate, a modulation electrode that modulates light waves propagating in the optical waveguide, an optical fiber that guides an output light from the optical waveguide, light collecting means for collecting two radiated lights from the Mach-Zehnder type optical waveguide toward a single optical receiving element, and light intensity ratio adjusting means for adjusting a light intensity ratio of the two radiated lights received by the optical receiving element.

Abstract: Provided is an optical receiver which accurately demodulates an optical signal obtained by the differential phase shift modulation method. The optical receiver includes: an interferometer which branches the inputted optical signal into two parts and gives a one-bit phase difference to the resultant two optical signals so that the two optical signals after addition of the phase difference are made to interfere each other to output two output lights; reflection means which reflects one of the output lights from the interferometer so as to return to the interferometer; detection means which detects the return light which has been reflected by the reflection means and propagates through the interferometer in the different direction from the inputted optical signal, for output; and phase difference control means which adjusts the phase difference given by the interferometer according to the intensity of the return light detected by the detection means.

Abstract: An optical waveguide device is provided which can efficiently guide undesired light to the outside of a substrate or the outside of the overall optical waveguides even when optical waveguides are integrated. In the optical waveguide device, an optical waveguide is formed on a substrate, the optical waveguide includes a main waveguide in which signal light propagates and an undesired-light waveguide for removing undesired light from the main waveguide, and the undesired-light waveguide is separated by the main waveguide interposed therebetween at an intersection in which the undesired-light waveguide and the main waveguide intersect each other.

Abstract: An optical waveguide device having a Mach-Zehnder type waveguide formed on a substrate is provided in which a slope of two waveguides input to an optical coupler on an output side of the Mach-Zehnder type waveguide is 0 degrees, a waveguide of the optical coupler after being coupled by the optical coupler is a multi-mode waveguide, and the waveguide which is output from the optical coupler is a three-branched waveguide including an output main waveguide and two output sub waveguides interposing the output main waveguide therebetween.

Abstract: An electric field measuring apparatus measures electric field intensity of an electromagnetic wave generated from equipment under test installed in an area in which electromagnetic waves are detected. The apparatus includes an antenna, an RF amplifier amplifying an output signal of the antenna, a signal intensity detector detecting whether intensity of the output signal is higher than a predetermined level, a signal generator generating a detection result signal on the basis of a detection result of the signal intensity detector, a multiplexer multiplexing an output signal of the RF amplifier, the detection result signal, and a DC bias voltage, and an optical intensity modulator having a Mach-Zehnder type optical waveguide performing an optical modulation operation on the basis of an output signal of the multiplexer are arranged inside the area. Arranged outside the area are a light source unit, a receiver unit, a DC bias controller, and a display unit.

Abstract: An optical receiver includes interference means 2 for branching the optical signal modulated in a DQPSK manner into two light beams, delaying at least one branched light beam so that two branched light beams have a predetermined phase difference, rotating the polarization plane of at least one branched light beam so that the polarization planes of the two branched light beams are orthogonal to each other, and coupling the two branched light beams, light separation adjusting means 3 to 5 for separating the output light beam from the interference means and adjusting the polarization planes of the separated light beams, and detection means 6 and 6? for detecting light intensities of the separated light beams output from the light separation adjusting means, wherein an I-component signal and a Q-component signal are generated on the basis of detection signals from the detection means.

Abstract: The present invention relates to an optical receiver, and particularly, to an optical receiver by which a DQPSK-modulated optical signal is demodulated to a multilevel phase-modulated signal.