Abstract: A liquid crystal light modulator 11 modulates a light according to an effective value of a supplied drive signal. A driving apparatus 21 changes the effective value of each frame of the drive signal supplied to the liquid crystal light modulator 11 according to modulation data. The driving apparatus 21 generates the drive signal containing plural pulses in each frame. The driving apparatus 21 supplies the generated drive signal to the liquid crystal light modulator 11, thereby enabling a high-frequency drive of the liquid crystal light modulator 11.

Abstract: The invention provides an optical device and an optical device manufacturing method wherein provisions are made to be able to precisely align an optical fiber relative to a substrate without heating the substrate and to maintain the optimum alignment condition for an extended period of time. More specifically, the invention provides an optical device manufacturing method which includes the steps of forming a first metallic film on a portion of a substrate, forming a second metallic film on a portion of the outer circumference of an optical fiber, and bonding together the first metallic film and the second metallic film by surface activated bonding,, and an optical device manufactured by such a manufacturing method.

Abstract: To provide a liquid crystal device and a method of manufacturing the liquid crystal device which has high durability in an environment of high temperature and high humidity, and which can be applied to optical communication device. A liquid crystal device and a method of manufacturing the liquid crystal device includes a first substrate provided with a frame shaped seal region for encapsulating a liquid crystal layer, and a second substrate provided in opposition to the first substrate, wherein a gold frame shaped structure is provided in the seal region of the first substrate so as to be crushed and deformed to form metallic bond when superimposed and joined to the second substrate, and wherein a gold film is disposed in the portion of the second substrate opposed to the gold frame shaped structure so as to form metallic bond to the gold frame shaped structure.

Abstract: An object of the present invention is to provide a laser light source that includes a laser element and an optical element that are optically coupled efficiently and directly. A laser light source includes, a laser element which has a ridge part and emits laser light from a light emission part, an optical element which has a waveguide for guiding the laser light that is incident on an incidence part; and a substrate for joining the laser element and the optical element close so as to be optically coupled directly, and, in this laser light source, the laser element and the optical element are joined to the substrate in a state in which a position of the incidence part is shifted a predetermined distance upward or downward with respect to a position of the light emission part.

Abstract: An object of the invention is to provide an optical device and an optical device manufacturing method wherein provisions are made to be able to substantially prevent misalignment from occurring in an optical element and prevent shifting from occurring in the optical waveguide characteristics of the optical element. The optical device includes a first optical element, a second optical element optically coupled to the first optical element, and a first silicon substrate on which the first optical element and the second optical element are mounted, wherein the second optical element includes a second silicon substrate and a waveguide substrate laminated to the second silicon substrate, and the second optical element is mounted on the first silicon substrate in such a manner that the waveguide substrate faces the first silicon substrate.

Abstract: A liquid crystal spatial light modulator for adjusting an optical signal is configured in such a manner that a region of one element is partitioned into two regions so as to perform intensity modulation in one region and phase modulation in the other region. Since the region for performing the intensity modulation and the region for performing the phase modulation can be formed by partitioning one region of the liquid crystal spatial light modulator, only one element allows adjusting functions, both the optical signal intensity modulation and phase modulation.

Abstract: An optical modulator 100 includes an input unit 110, a splitter unit 120, a first waveguide 131, a second waveguide 132, a directional coupler unit 140, a first output unit 151, a second output unit 152, a first liquid-crystal cell 161, and a second liquid-crystal cell 162. The splitter unit 120, the first waveguide 131, the second waveguide 132, and the directional coupler unit 140 form an optical interferometer that branches an input light and causes the branched lights to interfere. The first liquid-crystal cell 161 and the second liquid-crystal cell 162 transmit the lights branched in the optical interferometer and delay the lights according to applied signals, respectively. The second liquid-crystal cell 162 is thinner than the first liquid-crystal cell 161.

Abstract: A wavelength conversion device includes a base substrate having a transparent electrode on one surface thereof and a ferroelectric single crystal substrate provided with an optical waveguide. The ferroelectric single crystal substrate has an insulating film formed on one surface and is bonded to the base substrate such that the insulating film faces the transparent electrode.

Abstract: In a light source device for combining light waves with at least three wavelengths and outputting thus combined light waves, an optical system element and an electrical system element are formed on a semiconductor substrate, thereby eliminating the necessity of optical members such as an optical connector, and saving space to place the optical members as well as reducing arrangement spacing. In addition, the space necessary for wiring in an electrical circuit is reduced. Therefore, an integration degree of each of the elements, the optical system element and the electrical system element, is enhanced. The optical system element and the electrical system element are formed in layers on the same conductor substrate, thereby reducing the area that is required in configuring a parallel establishment of the optical system element and the electrical system element.

Abstract: A liquid crystal spatial light modulator for adjusting an optical signal is configured in such a manner that a region of one element is partitioned into two regions so as to perform intensity modulation in one region and phase modulation in the other region. Since the region for performing the intensity modulation and the region for performing the phase modulation can be formed by partitioning one region of the liquid crystal spatial light modulator, only one element allows adjusting functions, both the optical signal intensity modulation and phase modulation.

Abstract: In an optical device 1 in which a wavelength converting element 20 is disposed as an optical element on a silicon substrate 10, configuration includes heaters 40a and 40b formed on the silicon substrate 10; and micro bumps 30a, 30b that are made of Au, that bond the silicon substrate 10 and the wavelength converting element 20, and that transfer the heat generated by the heaters 40a, 40b to the wavelength converting element 20.

Abstract: A laser light source includes a laser element that outputs a fundamental wave; a wavelength conversion element to which the fundamental wave is input and that wavelength-converts at least a portion of the input fundamental wave to a converted wave having a wavelength shorter than the fundamental wave; a first waveguide that guides an output wave from the wavelength conversion element; a second waveguide that attenuates and guides a component of the fundamental wave included in the output wave from the first waveguide; a diffraction grating that is formed in the first waveguide and locks a wavelength or a frequency of the fundamental wave output from the laser element by feeding back the fundamental wave output from the wavelength conversion element.

Abstract: An integrated device includes an optical element and an electrical element that are implemented on a substrate. The optical element and the electrical element are bonded by surface-activated bonding technology to a bonding portion that is formed on the substrate and made of metal material.

Abstract: A laser source includes a laser device configured to emit laser light at a given angle with respect to a normal of an output end face; and an optical device configured to include an optical waveguide that guides and outputs the laser light. The output end face of the laser device is parallel to an input end face of the optical device, and the optical waveguide extends in a direction of ?w1 that is given by ?w1=arcsin(sin ?a1/nF), where ?a1 denotes an outgoing angle of the laser light from the laser device, and nF denotes an effective refractive index of the optical waveguide for the laser light.

Abstract: A space between substrates in a liquid crystal optical modulator can be sealed with a metal by using a simple configuration. In a seal structure between the substrates constituting a liquid crystal cell in a liquid crystal optical modulator, metal members are provided on the opposing surfaces of the two substrates, and the base metal surfaces of the metal members are brought into direct contract and joined. As a result, a low-melting metal such as a solder that has been conventionally introduced into the joint section becomes unnecessary, and a metal seal providing for strong bonding can be formed with a simple configuration. The liquid crystal optical modulator has a first substrate having a first electrode pattern including a pixel electrode, a second substrate having a second electrode pattern including a counter electrode, and a metal seal disposed so as to be sandwiched between the first substrate and the second substrate.

Abstract: A liquid crystal light modulator 11 modulates a light according to an effective value of a supplied drive signal. A driving apparatus 21 changes the effective value of each frame of the drive signal supplied to the liquid crystal light modulator 11 according to modulation data. The driving apparatus 21 generates the drive signal containing plural pulses in each frame. The driving apparatus 21 supplies the generated drive signal to the liquid crystal light modulator 11, thereby enabling a high-frequency drive of the liquid crystal light modulator 11.

Abstract: An optical modulator 100 includes an input unit 110, a splitter unit 120, a first waveguide 131, a second waveguide 132, a directional coupler unit 140, a first output unit 151, a second output unit 152, a first liquid-crystal cell 161, and a second liquid-crystal cell 162. The splitter unit 120, the first waveguide 131, the second waveguide 132, and the directional coupler unit 140 form an optical interferometer that branches an input light and causes the branched lights to interfere. The first liquid-crystal cell 161 and the second liquid-crystal cell 162 transmit the lights branched in the optical interferometer and delay the lights according to applied signals, respectively. The second liquid-crystal cell 162 is thinner than the first liquid-crystal cell 161.

Abstract: A space between substrates in a liquid crystal optical modulator can be sealed with a metal by using a simple configuration. In a seal structure between the substrates constituting a liquid crystal cell in a liquid crystal optical modulator, metal members are provided on the opposing surfaces of the two substrates, and the base metal surfaces of the metal members are brought into direct contract and joined. As a result, a low-melting metal such as a solder that has been conventionally introduced into the joint section becomes unnecessary, and a metal seal providing for strong bonding can be formed with a simple configuration. The liquid crystal optical modulator has a first substrate having a first electrode pattern including a pixel electrode, a second substrate having a second electrode pattern including a counter electrode, and a metal seal disposed so as to be sandwiched between the first substrate and the second substrate.

Abstract: A liquid crystal spatial light modulator for adjusting an optical signal is configured in such a manner that a region of one element is partitioned into two regions so as to perform intensity modulation in one region and phase modulation in the other region. Since the region for performing the intensity modulation and the region for performing the phase modulation can be formed by partitioning one region of the liquid crystal spatial light modulator, only one element allows adjusting functions, both the optical signal intensity modulation and phase modulation.

Abstract: For statically driving a liquid-crystal optical-modulation device, an alternating electric field produced by a drive signal is applied to a liquid crystal included therein. In a first period in which the alternating electric field has a first polarity, the drive signal is pulse-width modulated based on a first ON-voltage and a first OFF-voltage. In a second period in which the alternating electric field has a second polarity, the drive signal is pulse-width modulated based on a second ON-voltage and a second OFF-voltage.