Abstract: An optical receiving device includes multiple input ports to which light is input; multiple amplifiers that are arrayed and provided corresponding to the input ports, respectively, each of the amplifiers amplifying and outputting light input from a corresponding input port among of the input ports; a photo diode that converts light into an electrical signal; and a lens that inputs to the photo diode light output from the amplifiers.

Abstract: An optical amplification module has a semiconductor optical amplifier, a package accommodating the semiconductor optical amplifier, and a first connector and a second connector holding respective collimator lenses and arranged in parallel on the package. A sum of bend radii of the first optical fiber and the second optical fiber is greater than a space between the first connector and the second connector.

Abstract: An optical gate array device which permits the use of an optical gate array with a pitch smaller than the diameter of optical fibers. The optical gate array has an array of optical gates, and an optical fiber array has an array of optical fibers. A lens is arranged between the optical gate array and the optical fiber array, for collectively achieving optical coupling between all of the optical gates of the optical gate array and all of the optical fibers of the optical fiber array.

Abstract: In an optical module, an optical element array is an array of optical elements. Further, a lens array is an array of a plurality of lenses. An output point of a light beam of each optical element of the optical element array is caused to coincide with a central line of a corresponding lens of the lens array, and the light beam is made incident on the lens and a parallel beam is output from the lens. When the output point of the light beam of the optical element coincides with an optical axis of the lens, an optical path within the optical element and the optical axis of the lens fail to coincide with each other.

Abstract: An optical network system is disclosed by which flexible wavelength path setting can be performed in accordance with tree-shaped and star-shaped network topology. A central node includes a multiplexing section for multiplexing optical signals transmitted from user nodes and inputted thereto, and a central node side branching section for branching the optical signal multiplexed by the multiplexing section and supplying the branched optical signals to the user nodes. Each of the user nodes includes a transmission section capable of outputting an optical signal to which transmission wavelengths different from those of the other user nodes are set, and a reception section for extracting selected optical wavelength components from the branched light supplied thereto from the central node side branching section and extracting optical signals from the extracted optical wavelength components.

Abstract: An optical network system is disclosed by which flexible wavelength path setting can be performed in accordance with tree-shaped and star-shaped network topology. A central node includes a multiplexing section for multiplexing optical signals transmitted from user nodes and inputted thereto, and a central node side branching section for branching the optical signal multiplexed by the multiplexing section and supplying the branched optical signals to the user nodes. Each of the user nodes includes a transmission section capable of outputting an optical signal to which transmission wavelengths different from those of the other user nodes are set, and a reception section for extracting selected optical wavelength components from the branched light supplied thereto from the central node side branching section and extracting optical signals from the extracted optical wavelength components.

Abstract: In an SOA array optical module, the central axis of a beam output from each intra-SOA waveguide is oblique by 22.3 degrees to a normal to an end face of an SOA array on the output side (the same applies to the input side) of the SOA array having intra-SOA waveguides of 8 channels. First and second lens arrays are arranged for the SOA array so that the central axis of the beam that is output obliquely by 22.3 degrees from the SOA array, the optical axis of a lens convex part of each channel of the first lens array, and the optical axis of a lens convex part of each channel of the second lens array agree with one another. Level differences are provided respectively on faces opposite to the lens convex parts of the first and the second lens arrays.

Abstract: In an optical add/drop multiplexer dropping and inserting a light of a specific wavelength for a WDM signal light and an optical network system utilizing the same, a wavelength selective switch selects a part of WDM signal lights inputted as lights of drop wavelengths and outputting other lights, and a reject/add filter terminates lights of same wavelengths as add wavelengths among output lights from the wavelength selective switch and multiplexes other lights than the terminated lights and lights of the add wavelengths to be outputted. At this time, the drop wavelengths are made to include all of the add wavelengths.

Abstract: An optical amplification system includes a wavelength filter that divides a wavelength multiplexing optical signal into a plurality of wavelength multiplexing optical signals having wider wavelength intervals than wavelength intervals of the wavelength multiplexing optical signal, and a first optical amplifier that performs optical amplification on the plurality of divided wavelength multiplexing optical signals independently of one another.

Abstract: An optical gate array device which permits the use of an optical gate array with a pitch smaller than the diameter of optical fibers. The optical gate array has an array of optical gates, and an optical fiber array has an array of optical fibers. A lens is arranged between the optical gate array and the optical fiber array, for collectively achieving optical coupling between all of the optical gates of the optical gate array and all of the optical fibers of the optical fiber array.

Abstract: An optical semiconductor apparatus includes: an optical semiconductor element that outputs light; a lens that transmits light output from the optical semiconductor element; and a support member that is integrally formed and includes a first support supporting the optical semiconductor element, a second support supporting the lens, and an intermediate portion through which the first support and the second support are integrated.

Abstract: An optical gate array device which permits the use of an optical gate array with a pitch smaller than the diameter of optical fibers. The optical gate array has an array of optical gates, and an optical fiber array has an array of optical fibers. A lens is arranged between the optical gate array and the optical fiber array, for collectively achieving optical coupling between all of the optical gates of the optical gate array and all of the optical fibers of the optical fiber array.

Abstract: In the ring type optical communication system of the present invention, in each OADM arranged on a ring network, an optical signal which has the same wavelength as the add wavelength assigned to a local node, of the optical signals of each wavelength contained in WDM light input from on the ring, is extracted from a drop port Pd without being terminated by a rejection/add filter, and input to an optical switch. In the optical switch, either one of the optical signal extracted from the rejection/add filter, or the add light added onto the ring from the local node, is selected, and the selected light is applied to the add port Pa of the rejection/add filter. As a result, communication between a central station and optional OADM nodes, and multicast communication over a plurality of ring networks can be realized by means of a simple node configuration.

Abstract: In an SOA array optical module, the central axis of a beam output from each intra-SOA waveguide is oblique by 22.3 degrees to a normal to an end face of an SOA array on the output side (the same applies to the input side) of the SOA array having intra-SOA waveguides of 8 channels. First and second lens arrays are arranged for the SOA array so that the central axis of the beam that is output obliquely by 22.3 degrees from the SOA array, the optical axis of a lens convex part of each channel of the first lens array, and the optical axis of a lens convex part of each channel of the second lens array agree with one another. Level differences are provided respectively on faces opposite to the lens convex parts of the first and the second lens arrays.

Abstract: An AOTF control apparatus, which applies an RF signal to an AOTF to allow a selected light to pass through the AOTF, includes: a first calculating unit calculating a relationship between a frequency of the RF signal and a wavelength of the selected light based on a frequency of the RF signal that allows a reference light to pass through the AOTF; and a second calculating unit calculating a relationship between a power of the RF signal and an attenuation amount of the selected light based on an input/output power of the reference signal at the input/output of the AOTF.

Abstract: An optical transmission device improved in quality and reliability of OADM function and permitting configuration of highly-flexible, economical OADM networks. A wavelength tunable filter variably selects a wavelength according to a control frequency. A filter controller applies the control frequency to the filter while scanning wavelength over an entire signal bandwidth, to detect, from a reference wavelength monitor signal supplied thereto, a reference control frequency which permits the filter to select a reference wavelength and according to which wavelength is matched. On receiving a wavelength selection request, the controller obtains a target control frequency from the reference control frequency and the position of a target wavelength relative to the reference wavelength, and applies the obtained frequency to the filter. A reference wavelength filter transmits the reference wavelength therethrough. A light-receiving element monitors the transmitted reference wavelength to generate the monitor signal.

Abstract: An optical gate array device which permits the use of an optical gate array with a pitch smaller than the diameter of optical fibers. The optical gate array has an array of optical gates, and an optical fiber array has an array of optical fibers. A lens is arranged between the optical gate array and the optical fiber array, for collectively achieving optical coupling between all of the optical gates of the optical gate array and all of the optical fibers of the optical fiber array.

Abstract: An optical gate array device which permits the use of an optical gate array with a pitch smaller than the diameter of optical fibers. The optical gate array has an array of optical gates, and an optical fiber array has an array of optical fibers. A lens is arranged between the optical gate array and the optical fiber array, for collectively achieving optical coupling between all of the optical gates of the optical gate array and all of the optical fibers of the optical fiber array.

Abstract: An AOTF control apparatus, which applies an RF signal to an AOTF to allow a selected light to pass through the AOTF, includes: a first calculating unit calculating a relationship between a frequency of the RF signal and a wavelength of the selected light based on a frequency of the RF signal that allows a reference light to pass through the AOTF; and a second calculating unit calculating a relationship between a power of the RF signal and an attenuation amount of the selected light based on an input/output power of the reference signal at the input/output of the AOTF.

Abstract: In an optical add/drop multiplexer dropping and inserting a light of a specific wavelength for a WDM signal light and an optical network system utilizing the same, a wavelength selective switch selects a part of WDM signal lights inputted as lights of drop wavelengths and outputting other lights, and a reject/add filter terminates lights of same wavelengths as add wavelengths among output lights from the wavelength selective switch and multiplexes other lights than the terminated lights and lights of the add wavelengths to be outputted. At this time, the drop wavelengths are made to include all of the add wavelengths.