Abstract: A waveguide type optical device includes a substrate where a waveguide is formed; a supplemental plate connected on the substrate by using an adhesive; and a groove forming part formed by cutting through the supplemental plate so as to reach the substrate and cut the waveguide, the groove forming part being where a functional thin film is inserted. The supplemental plate and the waveguide adhere to each other or come close to each other in a range not influencing a mode of light.

Abstract: According to one embodiment, a system is provided, which provides moving picture data representing a road-traffic state. This system synthesizes the moving picture data with additional data such as advertisement data, generating output data. The system distributes the output data to the facilities built along the road and the vehicles running on the road.

Abstract: An optical device including (a) a substrate having an electro-optic effect; (b) a modulating optical waveguide formed on a surface layer portion of said substrate and forming an interference optical modulator for modulating input light; (c) an output optical waveguide formed on said surface layer portion of said substrate and connected to a downstream side portion of said modulating optical waveguide; and (d) a branching monitoring section for monitoring branched light of light propagated along said output optical waveguide and emitted from an outgoing end face of said substrate. The output waveguide has a reduced width region in which the waveguide width is reduced.

Abstract: In a multilevel light intensity modulator of the invention, input light is branched into n (n is an integer of 2 or more), and respectively sent to n branching waveguides. On the branching waveguides are respectively provided MZI light modulating sections. The MZI light modulating sections branch the input light into two at a branching ratio different from 0.5:0.5, and respectively output a binary optical signal with a quenching ratio being deteriorated, by on/off driving with a binary electric signal. Then by coupling the light output from the MZI light modulating sections, an optical signal with the light intensity modulated to a 2n value not including the zero level is output. As a result quaternary or higher level light intensity modulation which does not include the zero level, can be realized by a practical configuration using a binary electric signal.

Abstract: The invention relates to an optical device which can increase the spread of a beam diameter in the depthwise direction by a simple configuration in comparison with that by prior art devices. The optical device includes a substrate, an optical path formed on the substrate, and a diffraction propagation region, provided between the optical path and an end face of the substrate, for propagating light emitted from the optical path with diffraction. The diffraction propagation region includes a first groove, formed therein, adapted to block part of components of the propagated light in a depthwise direction of the substrate.

Abstract: Optical waveguides (A) and (B) of a Mach-Zehnder modulator is normally formed on a ?Z plane as an electric polarization non-inversion area. However, when the signal electrode 11 and the ground electrode 10 are provided asymmetrically on two waveguides, chirp occurs in output light, which is undesired. Therefore, these electrodes are provided symmetrically about the two waveguides. To effectively perform optical modulation, a part of the substrate in which an optical waveguide exists is to be electric polarization-inverted. As a result of the electric polarization inversion the optical waveguide is on the +Z plane. However, electric charge is accumulated on the +Z plane from unstable spontaneous electric polarization of an electric polarization inversion area, and has undesired influence on the performance of the optical modulator. Therefore, a conductive amorphous layer is formed on the surface of the electric polarization inversion area.

Abstract: In the waveguide polarizer, an optical waveguide formed on a substrate includes a curved portion and there is provided an optical absorbing portion positioned on the outside in radial direction of the curved portion, and one of orthogonal polarization components of a light propagated through the optical waveguide ran out from the curved portion to the outside in radial direction is propagated through the optical absorbing portion to thereby be led to the outside of the optical waveguide, so that only the other polarization component is propagated to be output. Thus, it becomes possible to realize a miniaturized waveguide polarizer of low wavelength dependence.

Abstract: According to an aspect of an embodiment, an optical waveguide; and a branching section which branches a part of a light propagating through the optical waveguide, wherein the branching section has a first coupler which branches the light propagating through the optical waveguide according to a given unequal branching ratio so as to output first and second branched lights, and uses the first branched light as a first output light; and a second coupler which inputs the second branched light output from the first coupler and branches the second branched light into two lights according to a branching ratio which is substantially equal to the branching ratio in the first coupler so as to output third and fourth branched lights, and uses the fourth branched light as a second output light.

Abstract: An optical device including (a) a substrate having an electro-optic effect; (b) an optical waveguide formed on a surface layer portion of said substrate and including an optical waveguide for performing optical modulation for light inputted to said substrate and an output optical waveguide and a monitoring optical waveguide branched from and connected to a downstream side portion of said modulating optical waveguide, said monitoring optical waveguide guiding light for monitoring optical modulation operation of said modulating optical waveguide; and (c) a reflecting portion being provided on the downstream side of said monitoring optical waveguide for reflecting light propagated along said monitoring optical waveguide, the width of a reflection face of said reflecting portion being substantially equal to the cut-out width of said monitoring optical waveguide.

Abstract: An optical device is disclosed which suppresses a bias shift which is a deviation of a phase relationship between output signal light and monitoring light. The optical device includes a substrate having an electro-optic effect, a modulating optical waveguide formed on a surface layer portion of the substrate and forming an interference optical modulator for modulating input light, and an output optical waveguide and a monitoring optical waveguide each formed on the surface layer portion of the substrate and branched from and connected to a downstream side portion of the modulating optical waveguide. The monitoring optical waveguide guides light for monitoring optical modulation operation of the modulating optical waveguide. The monitoring optical waveguide has a reduced width region which has a reduced waveguide width.

Abstract: The present invention relates to an optical device including a branching unit for making branches of incident light in a first branch ratio, a phase adjusting unit for adjusting the relationship in phase among branched lights obtained by the branching unit and a combining/branching unit for combining the lights after the phase adjustment by the phase adjusting unit and for then making branches of the combined light in a second branch ratio, at least one of the first branch ratio and the second branch ratio being previously set at a branch ratio other than 1:1. This can realize an optical device capable of properly selecting output light with a different wavelength chirp quantity.

Abstract: An optical device including (a) a substrate having an electro-optic effect; (b) a modulating optical waveguide formed on a surface layer portion of said substrate and forming an interference optical modulator for modulating input light; (c) an output optical waveguide formed on said surface layer portion of said substrate and connected to a downstream side portion of said modulating optical waveguide; and (d) a branching monitoring section for monitoring branched light of light propagated along said output optical waveguide and emitted from an outgoing end face of said substrate. The output waveguide has a reduced width region in which the waveguide width is reduced.

Abstract: The invention relates to an optical device which can increase the spread of a beam diameter in the depthwise direction by a simple configuration in comparison with that by prior art devices. The optical device includes a substrate, an optical path formed on the substrate, and a diffraction propagation region, provided between the optical path and an end face of the substrate, for propagating light emitted from the optical path with diffraction. The diffraction propagation region includes a first groove, formed therein, adapted to block part of components of the propagated light in a depthwise direction of the substrate.

Abstract: The present invention has an object to provide an optical device capable of leading out a light propagated through an optical waveguide to a desired substrate side face while maintaining the sufficient power of the light, within a range of limited substrate size. To this end, according to the optical device of the present invention, a groove is formed in the vicinity of an end portion on the optical output side of the optical waveguide, on the substrate on which the optical waveguide is formed, a side wall of the groove is used as a reflecting plane, the light output from the optical waveguide is reflected by the reflecting plane, and the reflected light is emitted from the desired substrate side face.

Abstract: An optical device including (a) a substrate having an electro-optic effect; (b) an optical waveguide formed on a surface layer portion of said substrate and including an optical waveguide for performing optical modulation for light inputted to said substrate and an output optical waveguide and a monitoring optical waveguide branched from and connected to a downstream side portion of said modulating optical waveguide, said monitoring optical waveguide guiding light for monitoring optical modulation operation of said modulating optical waveguide; and (c) a reflecting portion being provided on the downstream side of said monitoring optical waveguide for reflecting light propagated along said monitoring optical waveguide, the width of a reflection face of said reflecting portion being substantially equal to the cut-out width of said monitoring optical waveguide.

Abstract: The present invention has an object to provide an optical device capable of leading out a light propagated through an optical waveguide to a desired substrate side face while maintaining the sufficient power of the light, within a range of limited substrate size. To this end, according to the optical device of the present invention, a groove is formed in the vicinity of an end portion on the optical output side of the optical waveguide, on the substrate on which the optical waveguide is formed, a side wall of the groove is used as a reflecting plane, the light output from the optical waveguide is reflected by the reflecting plane, and the reflected light is emitted from the desired substrate side face.

Abstract: A waveguide type optical device includes a substrate where a waveguide is formed; a supplemental plate connected on the substrate by using an adhesive; and a groove forming part formed by cutting through the supplemental plate so as to reach the substrate and cut the waveguide, the groove forming part being where a functional thin film is inserted. The supplemental plate and the waveguide adhere to each other or come close to each other in a range not influencing a mode of light.

Abstract: An optical waveguide device includes a substrate having an electro-optical effect, an optical waveguide formed on the substrate, an electrode provided for the optical waveguide, a monitoring optical waveguide for guiding part of light outputted from the optical waveguide as monitor light, an attenuation section provided for the monitoring optical waveguide for attenuating the monitor light, and a light detection section for detecting the intensity of the monitor light guided by the monitoring optical waveguide and attenuated by the attenuation section.

Abstract: An optical device is disclosed which suppresses a bias shift which is a deviation of a phase relationship between output signal light and monitoring light. The optical device includes a substrate having an electro-optic effect, a modulating optical waveguide formed on a surface layer portion of the substrate and forming an interference optical modulator for modulating input light, and an output optical waveguide and a monitoring optical waveguide each formed on the surface layer portion of the substrate and branched from and connected to a downstream side portion of the modulating optical waveguide. The monitoring optical waveguide guides light for monitoring optical modulation operation of the modulating optical waveguide. The monitoring optical waveguide has a reduced width region which has a reduced waveguide width.

Abstract: The present invention relates to an optical device including a branching unit for making branches of incident light in a first branch ratio, a phase adjusting unit for adjusting the relationship in phase among branched lights obtained by the branching unit and a combining/branching unit for combining the lights after the phase adjustment by the phase adjusting unit and for then making branches of the combined light in a second branch ratio, at least one of the first branch ratio and the second branch ratio being previously set at a branch ratio other than 1:1. This can realize an optical device capable of properly selecting output light with a different wavelength chirp quantity.