Abstract: An object is to improve crosstalk between ports while keeping an interposer circuit small. In an interposer circuit that includes a first surface connected to an optical circuit, a second surface that is connected to a fiber block and is located opposite to the first surface in parallel with the first surface, and a plurality of connection waveguides connected to a plurality of input/output waveguides included in the optical circuit and a plurality of input/output fibers included in the fiber block, the connection waveguides each have a straight shape, and an angle (?) formed between the first surface and each of the connection waveguides is the same as an angle (?) formed between the second surface and each of the connection waveguides.

Abstract: To provide an optical 90-degree hybrid formed of a silicon waveguide capable of suppressing an optical loss and a phase error, and facilitating electronic packaging and optical packaging. In the optical 90-degree hybrid circuit including two optical branching units facing each other and two optical coupling units facing away from each other, four arm waveguides are arranged including bent waveguides each of which guides an output light of the optical branching unit to the optical coupling unit, and is formed in a curved shape.

Abstract: A wavelength monitoring circuit obtains a light output proportional to only an input optical signal, independent of wavelength, by adding a light split circuit to the configuration in the related art, or changing the light split circuit to a light trifurcation circuit. In addition, wavelength monitoring with high accuracy is possible while improving the resistance to noise. The extraction of the light output proportional to only the input optical signal is performed by a light split circuit for input light at the top stage of the wavelength monitoring circuit or a light split circuit for interference in a stage in the middle of the circuit. The changed light split circuit causes the MZI included in the wavelength monitoring circuit to operate in a state of losing the balance of the configuration or the optical signal level, and increases the signal level near the bottom portion of the transmission characteristics.

Abstract: The invention provides a planar optical waveguide circuit capable of preventing part of the input signal light that has not been combined in the waveguide and propagates as leaked light from interfering with the output signal. A planar optical waveguide circuit having an optical waveguide embedded in a cladding layer includes: a plurality of parallel output optical waveguides configured to emit light from a same end face; a groove having a reflective interface formed at an angle of +45 degrees relative to the output optical waveguides and configured to reflect leaked light propagating in the cladding layer; and a groove having a reflective interface formed at an angle of ?45 degrees, the reflective interface formed at an angle of +45 degrees, the output optical waveguide, and the reflective interface formed at ?45 degrees being arranged repeatedly in that order.

Abstract: An optical module is provided with a columnar protrusion over the entire pickup area (EP) for automatic suction by a mounting device at the center of the upper surface of a fiber holding carrier. The protrusion secures a dedicated pickup area (EP1) on a top surface. When an extra length of an optical fiber extending from an optical device is routed and held between a pair of wall portions, the extra length including a tip portion is held in a storage area of the fiber holding carrier by a restoring force caused by being pressed against the wall portions. In this holding state, since the tip portion of the extra length can be disposed along the outer periphery of the protrusion, even in a case where the position where the optical fiber is held is slightly shifted by a shock from outside.

Abstract: An optical fiber array includes a V-groove substrate in which a V-groove for optical fiber alignment is formed, a pressing plate laminated and bonded on the V-groove substrate, and an optical fiber bonded and fixed in the V-groove of the V-groove substrate, wherein a distance between the optical fiber and the V-groove is less than 20 ?m.

Abstract: An optical circuit module in which an optical fiber array and an optical circuit substrate are connected, the optical fiber array including a groove substrate in which a groove for optical fiber alignment is formed, a pressing plate stacked on and bonded to the groove substrate, and an optical fiber bonded to and fixed in the groove of the groove substrate, and the optical circuit substrate including an input/output waveguide. In a connection surface of the optical circuit module, an area of a common portion in a cross section of the optical circuit substrate and the pressing plate is larger than an area of a common portion in a cross section of the optical circuit substrate and the groove substrate.

Abstract: An incorrect insertion and removal prevention system that can prevent an operator from incorrectly selecting a port to be operated without sacrificing the port mounting density is described. An optical transmission device 100 of the incorrect insertion and removal prevention system includes a plurality of ports 101 for transmitting and receiving an external signal, a touch sensor 102 installed in each of the ports 101 to detect a contact of the human body, a control unit 110 for causing a display unit 130 to display information about the port 101 corresponding to the touch sensor 102 detecting the contact of the human body, a storage unit 120 for storing information for distinguishing each port 101, and the display unit 130 for displaying the information for distinguishing each port 101.

Abstract: Provided is a polarization multiplexing optical transmitting and receiving circuit that compensates for transmission side PDL so as to suppress a reduction in transmission power and makes a branching ratio of light from a light source variable between a transmission side and a receiving side according to a system to be used.

Abstract: An optical circuit of the present disclosure shares at least a part of an electrical path including phase variable means between neighboring optical interference circuits, or configures an electrical path so as to straddle neighboring optical interference circuits, thereby performing electrical or thermal feedback. The optical circuit includes a mechanism using the electrical or thermal feedback for cancelling components of thermal crosstalk from one optical interference circuit to another neighboring optical interference circuit. The optical circuit of the present disclosure has a resistor element that shares electrical paths including respective phase variable means between the neighboring optical interference circuits. The optical circuit changes the phase change amount by the phase variable means in the neighboring optical interference circuit, in such a way as to cancel the thermal crosstalk components by the resistor element.

Abstract: There is provided an optical fiber array that can be easily optically connected to cores of optical waveguides on a connection counterpart substrate without requiring a complicated fabrication process to the connection counterpart substrate and laborious diffusing fusion of the cores. In an array, coating-removed exposed portions of fibers are attached to grooves that are provided on a lower substrate in order to position the optical fibers. Further, the exposed portions are pressed by a lid. Coated portions of the fibers are placed on a flat surface of a concave portion that is provided on the substrate to form a step with the grooves in a state where the exposed portions are attached. Front end parts of the exposed portions of the fibers each have a light collecting portion that collects light beams passing through an inside of the corresponding fiber to reduce an MFD.

Abstract: Provided is an optical waveguide component that may couple optical waveguides simply at low optical coupling loss when configuring a photoelectron integration device by means of hybrid integration by coupling an optical element. In the component, groove portions deeper than a core of an optical waveguide are provided in parallel on both sides of the core in an extending direction of the optical waveguide that covers the core. A refractive index of a medium that occupies the groove portions is lower than a refractive index of an underclad and an overclad to equivalently increase a difference in refractive index between the core and both the underclad and the overclad. Accordingly, confinement of light propagating through the core of the optical waveguide can be enhanced, and a mode field of the propagating light can be adjusted so as to become smaller.

Abstract: To provide an optical 90-degree hybrid formed of a silicon waveguide capable of suppressing an optical loss and a phase error, and facilitating electronic packaging and optical packaging. In the optical 90-degree hybrid circuit including two optical branching units facing each other and two optical coupling units facing away from each other, four arm waveguides are arranged including bent waveguides each of which guides an output light of the optical branching unit to the optical coupling unit, and is formed in a curved shape.

Abstract: An object is to improve crosstalk between ports while keeping an interposer circuit small. In an interposer circuit that includes a first surface connected to an optical circuit, a second surface that is connected to a fiber block and is located opposite to the first surface in parallel with the first surface, and a plurality of connection waveguides connected to a plurality of input/output waveguides included in the optical circuit and a plurality of input/output fibers included in the fiber block, the connection waveguides each have a straight shape, and an angle (?) formed between the first surface and each of the connection waveguides is the same as an angle (?) formed between the second surface and each of the connection waveguides.

Abstract: The invention provides a planar optical waveguide circuit capable of preventing part of the input signal light that has not been combined in the waveguide and propagates as leaked light from interfering with the output signal. A planar optical waveguide circuit having an optical waveguide embedded in a cladding layer includes: a plurality of parallel output optical waveguides configured to emit light from a same end face; a groove having a reflective interface formed at an angle of +45 degrees relative to the output optical waveguides and configured to reflect leaked light propagating in the cladding layer; and a groove having a reflective interface formed at an angle of ?45 degrees, the reflective interface formed at an angle of +45 degrees, the output optical waveguide, and the reflective interface formed at ?45 degrees being arranged repeatedly in that order.

Abstract: A wavelength monitoring apparatus includes a wavelength monitoring circuit. The wavelength monitoring circuit includes: a split circuit that splits an input optical signal into two; an optical delay circuit that applies a delay time difference to the two split optical signals; and a two-input two-output optical multiplexer/demultiplexer circuit that outputs a result of applying multiplexing interference to the optical signals to which the delay time difference has been applied. The wavelength monitoring apparatus further includes photoelectric conversion elements that perform photoelectric conversions on the two optical signals output from the wavelength monitoring circuit so as to output electrical signals.

Abstract: Provided is a polarization multiplexing optical transmitting and receiving circuit that compensates for transmission side PDL so as to suppress a reduction in transmission power and makes a branching ratio of light from a light source variable between a transmission side and a receiving side according to a system to be used.

Abstract: A wavelength monitoring circuit obtains a light output proportional to only an input optical signal, independent of wavelength, by adding a light split circuit to the configuration in the related art, or changing the light split circuit to a light trifurcation circuit. In addition, wavelength monitoring with high accuracy is possible while improving the resistance to noise. The extraction of the light output proportional to only the input optical signal is performed by a light split circuit for input light at the top stage of the wavelength monitoring circuit or a light split circuit for interference in a stage in the middle of the circuit. The changed light split circuit causes the MZI included in the wavelength monitoring circuit to operate in a state of losing the balance of the configuration or the optical signal level, and increases the signal level near the bottom portion of the transmission characteristics.

Abstract: A cleaning body 10 of the present invention includes a cloth-like body unit 11 and a washing liquid enclosure 12 provided on a surface of the body unit 11 or inside the body unit 11 and enclosing a washing liquid including alcohol. This can reduce a burden of conveyance by a user to enhance safety, and suitably exhibit cleaning capability.

Abstract: [Problem] To propose a highly accurate scheme for addressing lost alarms. [Solution] A lost alarm addressing system includes communication devices (11) configured to transmit an alarm to a management device (20) and transmit a number-of-alarms notification for notifying the number of transmitted alarms to the management device (20), and the management device (20) configured to count the number of alarms received from each of the communication devices (11), collate the counted number of alarms with the number of alarms notified using the number-of-alarms notification, and cause the communication device (11) to retransmit a lost alarm when the two numbers of alarms do not match. Further, the management device (20), when the management device (20) does not receive the number-of-alarms notification within a predetermined time after receiving the alarm from the communication device (11), causes the communication device (11) to retransmit the lost number-of-alarms notification.