Abstract: A first optical device has an optical fiber mount with an optical fiber disposed thereon, and an optical demultiplexer for demultiplexing a portion of an optical signal beam transmitted through the optical fiber, as a demultiplexed optical signal beam, and guiding the demultiplexed optical signal beam out of the optical fiber. The optical fiber has a first tapered surface for emitting the demultiplexed optical signal beam therethrough. The first tapered surface is inclined at an angle ?1 of at least 1° to an optical axis of the optical fiber. The distance (h) between the optical axis of the optical fiber and the first tapered surface is progressively greater along the direction in which the optical signal beam travels through the optical fiber.

Abstract: An optical device includes a glass substrate provided with one or more V-shaped grooves and an optical fiber array having one or more optical fibers. The optical fiber array is fixed within the V-shaped grooves of the glass substrate using a fixing adhesive. As viewed from above, a first region Z1 (i.e., the region indicated by cross-hatching) and a second region Z2 are provided on the optical fiber array, and the fixing adhesive is applied within the first region Z1. A refractive index matching resin, providing refractive index matching at least with the optical fibers, is disposed in the second region Z2, wherein the second region Z2 may be surrounded by the first region Z1.

Abstract: An optical device is made up of a glass substrate, an optical fiber array fixed to an upper portion of the glass substrate, a slit that extends from an upper surface of the optical fiber array into the glass substrate, a filter member inserted into the slit, and a resin filled in an interval between the slit and the filter member. An upper end of a light-incident surface of the filter member is positioned substantially in alignment with upper surfaces of the optical fibers, and an upper end of a light-exiting surface of the filter member is disposed at a position below the upper surfaces of the optical fibers.

Abstract: A PD array is used in an optical module for monitoring signal light. In the optical module, when monitoring is conducted, signal light that passes through an optical fiber array is branched by a branching section disposed in the optical fiber array, wherein branched light from the branching section is detected by a photodetector region. The PD array is mounted on the optical fiber array. On the back of the base of the PD array, a coating film for preventing degradation in characteristics is formed, wherein the coating film includes an anti-reflective multilayer film.

Abstract: An optical device includes an optical fiber having a core and a cladding, a slit extending from the upper surface of the optical fiber into a glass substrate, a filter member inserted in the slit, and a PD array for detecting divided light. A first high-polymer gel material fills a gap between the slit and a filter member within the slit. A second high-polymer gel material is interposed between an optical fiber array and the PD array and disposed on an optical path of the light divided by the filter member.

Abstract: A light controlling means includes a shutter member and an actuator. The shutter member is disposed in a slit and has a function to shut off signal light propagated in the light path of an optical fiber array. The actuator is constructed to drive and move the shutter member in a vertical direction. The shutter member is fixed to one end of the actuator and positioned substantially in alignment with an inclination angle of the slit. Further, a base member of the shutter member is made from transparent quartz glass. A light reflecting film is formed on a portion of one of the plate surfaces of the shutter member, on a surface opposite the optical axis of a light exit portion.

Abstract: When a surface of a filter member on a multilayer film is defined as a first surface, a surface of the filter member on an quartz substrate as a second surface, an inner wall surface of a slit which faces the first surface of the filter member as a first inner wall surface, and an inner wall surface of the slit which faces the second surface of the filter member as a second inner wall surface, one or more of the first inner wall surface and the second inner wall surface of the slit, and the second surface of the filter member do not lie parallel to the first surface of the filter member.

Abstract: An optical device comprises an optical head and a package containing the optical head and having pins led outside. A V-groove is formed in one side of a glass substrate. On the other side, the glass substrate is secured to the base of the package. A PD array and the pins are electrically interconnected through a gold electrode pattern formed on a mounting face of a submount, through holes, electrode pads formed on the top of the submount, and wires.

Abstract: An optical device has an optical fiber, an optical demultiplexer having an optical demultiplexing member for demultiplexing a portion of an optical signal beam transmitted through the optical fiber, as a demultiplexed optical signal beam, and guiding the demultiplexed optical signal beam out of the optical fiber, an optical path changer for changing an optical path of the demultiplexed optical signal beam guided out of the optical fiber, a waveguide serving as at least a medium from which the demultiplexed optical signal beam is emitted to the optical path changer, and a filter disposed on a surface of the waveguide. An angle of incidence of the demultiplexed optical signal beam on the filter is equal to or greater than 0.5°.

Abstract: A first optical device has an optical fiber mount with an optical fiber disposed thereon, and an optical demultiplexer for demultiplexing a portion of an optical signal beam transmitted through the optical fiber, as a demultiplexed optical signal beam, and guiding the demultiplexed optical signal beam out of the optical fiber. The optical fiber has a first tapered surface for emitting the demultiplexed optical signal beam therethrough. The first tapered surface is inclined at an angle ?1 of at least 1° to an optical axis of the optical fiber. The distance (h) between the optical axis of the optical fiber and the first tapered surface is progressively greater along the direction in which the optical signal beam travels through the optical fiber.

Abstract: An optical device includes an optical fiber mount with an optical fiber disposed thereon, and an optical demultiplexer having a slit defined in the optical fiber across an optical axis thereof, and an optical demultiplexing member inserted in the slit for demultiplexing a portion of an optical signal beam transmitted through the optical fiber, wherein the optical demultiplexer guides a demultiplexed optical signal beam from the optical demultiplexing member out of the optical fiber, an optical path changer for changing an optical path of the demultiplexed optical signal beam guided out of the optical fiber, a waveguide serving as a medium from which the demultiplexed optical signal beam is emitted to the optical path changer, and a filter disposed on a surface of the waveguide.

Abstract: An optical device comprises a PD array and a submount. Anode electrodes and cathode electrodes are disposed as a gold electrode pattern on a surface of the PD array facing the submount and a common cathode electrode and anode electrodes associated with respective channels are disposed as a gold electrode pattern on a mounting surface of the submount. The gold electrode pattern on the PD array and the gold electrode pattern on the submount are electrically connected to each other by a conductive layer. A gap between the PD array and the mounting surface of the submount includes a first gap corresponding to active layers and a second gap around the first gap, the first and second gaps comprising air.

Abstract: An optical device comprising a first substrate in which V-grooves are made, four optical fibers, for example, having a reflective function and fixed in the V-grooves of the first substrate, an optical element bonded, through an adhesive layer, onto the optical path of a reflected light at least generated by the reflective function on the outside of the clad of each optical fiber, and a second substrate for mounting the optical element, wherein the second substrate is disposed such that the mounting surface of the optical element faces the first substrate.

Abstract: A light controlling means includes a shutter member and an actuator. The shutter member is disposed in a slit and has a function to shut off signal light propagated in the light path of an optical fiber array. The actuator is constructed to drive and move the shutter member in a vertical direction. The shutter member is fixed to one end of the actuator and positioned substantially in alignment with an inclination angle of the slit. Further, a base member of the shutter member is made from transparent quartz glass. A light reflecting film is formed on a portion of one of the plate surfaces of the shutter member, on a surface opposite the optical axis of a light exit portion.

Abstract: An optical fiber, which is provided in each of channels of an optical fiber array disposed on V-grooves, has a portion (reflecting section) at which a core is cut out at an intermediate position of the optical fiber. The reflected light, which is split from a signal light transmitted in the core of the optical fiber on the basis of a refractive index difference at the reflecting section, is obtained through a index matching layer provided outside a clad of the optical fiber. The reflected light is monitored by a photodetector of a photodetecting array.

Abstract: A PD array is used in an optical module for monitoring signal light. In the optical module, when monitoring is conducted, signal light that passes through an optical fiber array is branched by a branching section disposed in the optical fiber array, wherein branched light from the branching section is detected by a photodetector region. The PD array is mounted on the optical fiber array. On the back of the base of the PD array, a coating film for preventing degradation in characteristics is formed, wherein the coating film includes an anti-reflective multilayer film.

Abstract: An optical device includes a glass substrate provided with one or more V-shaped grooves and an optical fiber array having one or more optical fibers. The optical fiber array is fixed within the V-shaped grooves of the glass substrate using a fixing adhesive. As viewed from above, a first region Z1 (i.e., the region indicated by cross-hatching) and a second region Z2 are provided on the optical fiber array, and the fixing adhesive is applied within the first region Z1. A refractive index matching resin, providing refractive index matching at least with the optical fibers, is disposed in the second region Z2, wherein the second region Z2 may be surrounded by the first region Z1.

Abstract: An optical device is made up of a glass substrate, an optical fiber array fixed to an upper portion of the glass substrate, a slit that extends from an upper surface of the optical fiber array into the glass substrate, a filter member inserted into the slit, and a resin filled in an interval between the slit and the filter member. An upper end of a light-incident surface of the filter member is positioned substantially in alignment with upper surfaces of the optical fibers, and an upper end of a light-exiting surface of the filter member is disposed at a position below the upper surfaces of the optical fibers.

Abstract: An optical device comprises an optical head and a package containing the optical head and having pins led outside. A V-groove is formed in one side of a glass substrate. On the other side, the glass substrate is secured to the base of the package. A PD array and the pins are electrically interconnected through a gold electrode pattern formed on a mounting face of a submount, through holes, electrode pads formed on the top of the submount, and wires.

Abstract: An optical device comprises a PD array and a submount. Anode electrodes and cathode electrodes are disposed as a gold electrode pattern on a surface of the PD array facing the submount and a common cathode electrode and anode electrodes associated with respective channels are disposed as a gold electrode pattern on a mounting surface of the submount. The gold electrode pattern on the PD array and the gold electrode pattern on the submount are electrically connected to each other by a conductive layer. A gap between the PD array and the mounting surface of the submount includes a first gap corresponding to active layers and a second gap around the first gap, the first and second gaps comprising air.