摘要:
A method for restoration from a fault in a communication network formed by interconnecting a plurality of nodes including at least one set of node equipment each including a line terminal equipment and an optical cross-connect equipment, via a plurality of transmission lines using optical fibers. According to this method for restoration from a fault, if a line terminal equipment of at least one set of node equipment has detected a fault in an optical fiber under communication, it gives a command functioning as trigger for optical fiber change-over to an optical cross-connect equipment included in the node equipment. Upon receiving this command functioning as the trigger, the optical cross-connect equipment exchanges change-over control information indicating optical switch setting situation between it and an optical cross-connect equipment included in another node equipment, and forms a restoration route.
摘要:
An optical transmission apparatus, an optical repeater using the optical transmission apparatus, and an optical cross-connect equipment for controlling switches depending on supervisory information, comprising: a doped fiber for amplifying an optical signal of wavelength Od; a wavelength multiplexer for outputting a pumping light to the doped fiber; a wavelength multiplexer for multiplexing an amplified optical signal and a supervisory optical signal to as to output it to an optical fiber at downstream side; a pumping and supervisory light source; an optical coupler for distributing the light from the light source at a ratio of N:1 to the wavelength multiplexers; and a driver for controlling the light source by adding the supervisory information and a direct current signal.
摘要:
An optical transmission apparatus, an optical repeater using the optical transmission apparatus, and an optical cross-connect equipment for controlling switches depending on supervisory information, comprising: a doped fiber for amplifying an optical signal of wavelength &lgr;d; a wavelength multiplexer for outputting a pumping light to the doped fiber; a wavelength multiplexer for multiplexing an amplified optical signal and a supervisory optical signal to as to output it to an optical fiber at downstream side; a pumping and supervisory light source; an optical coupler for distributing the light from the light source at a ratio of N:1 to the wavelength multiplexers; and a driver for controlling the light source by adding the supervisory information and a direct current signal.
摘要:
An optical transmission apparatus, an optical repeater using the optical transmission apparatus, and an optical cross-connect equipment for controlling switches depending on supervisory information, comprising: a doped fiber for amplifying an optical signal of wavelength οd; a wavelength multiplexer for outputting a pumping light to the doped fiber; a wavelength multiplexer for multiplexing an amplified optical signal and a supervisory optical signal to as to output it to an optical fiber at downstream side; a pumping and supervisory light source; an optical coupler for distributing the light from the light source at a ratio of N:1 to the wavelength multiplexers; and a driver for controlling the light source by adding the supervisory information and a direct current signal.
摘要:
A medium-scale IP telecommunications network is configured in a low-cost optical network with good reliability and expandability. A physical configuration example has a center node 2-1 and eight local nodes 2-11 through 2-18 connected in one OADM ring 2-21/2-22. The logical configuration is a star configuration with the central node 2-1 at its origin with all traffic passing through the center node 2-1. The local nodes 2-11 through 2-18 are connected to the central node 2-1 by wavelength-unit optical channels or optical paths λ1 through λ8. Channels are added as required. Initially, for example, the center node 2-1 and the local node 2-5 are connected by λ5, but λ13 can added when the need arises. Since the logical star network is limited to approximately two add/drop optical channels at local nodes, costs are reduced by using inexpensive filters (e.g., dielectric interference film filters or fiber Bragg reflectors) that are capable of extracting only the specific wavelength of the optical channel. High reliability is provided through the use of optical switches for correction of fiber transmission path failures.
摘要:
A plasma treatment apparatus is provided, which enables to increase a treatment area and provide good treatment uniformity. This apparatus comprises a pair of electrode plates having a plurality of through holes and an insulating plate having a plurality of through holes. The insulating plate is disposed between the electrode plates such that positions of the through holes of the electrode plates correspond to the positions of the through holes of the insulating plate. A plurality of discharge spaces are formed by the through holes of the electrode plates and the through holes of the insulating plate. By applying a voltage between the electrode plates, while supplying a plasma generation gas into the discharge spaces, plasmas are generated simultaneously in the discharge spaces, and sprayed on an object to efficiently perform a large-area, uniform plasma treatment.
摘要:
A process for producing aluminum nitride powders is disclosed, which comprises mixing a water-soluble aluminum-containing compound or an aluminum alkoxide and a water-soluble carbon-containing compound and/or a water-soluble nitrogen-containing compound, with water; drying the mixture to obtain a solid; and calcining the solid in a nitrogen-containing non-oxidative atmosphere. According to the process of the invention, high-purity uniform aluminum nitride fine powders can be obtained rapidly and inexpensively.
摘要:
When a roll paper unit 200 is incorporated into an image formation apparatus, a second outlet guide member 92 is turned around a pivot 92a in the direction of an arrow G, i.e., moved from a position of solid lines to a position of two-dot chain lines, a rear end portion 92b of this second outlet guide member 92 pressing down a front end portion 80c of a guide member 80 to cause the guide member 80 to be turned around a central shaft 80d in the direction of an arrow H, i.e., moved from a position of solid lines to a position of two-dot chain line. Consequently, a path extending in the direction of an arrow C is closed, while a path extending in the direction of an arrow F is opened, the roll paper 72 being transferred in the paper feed direction. When the roll paper unit 200 is drawn out, the second outlet guide member 92 and the guide member 80 are turned in the directions opposite to those mentioned above. Consequently, the path extending in the direction of the arrow F is closed, while the path extending in the direction of the arrow C is opened, the roll paper 72 being transferred in the paper discharge direction.
摘要:
A plasma processing apparatus for performing plasma processing of an article, comprising: a central electrode; a tubular outer electrode which is provided so as to surround the central electrode; a tubular reaction pipe which is disposed between the central electrode and the outer electrode so as to electrically insulate the central electrode and the outer electrode from each other; a gas supply device for supplying a plasma producing gas to a discharge space defined between the central electrode and the outer electrode in the reaction pipe; an AC power source for applying an AC voltage between the central electrode and the outer electrode; wherein not only the plasma producing gas is supplied to the discharge space by the gas supply device but the AC voltage is applied between the central electrode and the outer electrode by the AC power source so as to generate a glow discharge in the discharge space under atmospheric pressure such that a plasma jet is blown to the article from a blow-off outlet of the reaction pipe; and a cooling device for cooling the central electrode and the outer electrode.
摘要:
A surface treatment of a glass fabric used for a fiber reinforced composite such as multilayer circuit boards comprises the steps of exposing the glass fabric to an atmospheric pressure plasma of a mixture gas to obtain a plasma-treated surface of the glass fabric, and coating an organosilane compound on the plasma-treated surface. The mixture gas contains as a reaction gas at least one of an oxidative gas and a fluorine-containing gas, and a rare gas as a carrier of the reaction gas. The mixture gas is pre-heated prior to the plasma excitation thereof. When the glass fabric includes an organic compound as a sizing agent, the organic compound can be efficiently removed from the glass fabric by the exposing step. For example, the organosilane compound can be coated on the plasma-treated surface by exposing the plasma-treated surface to a second atmospheric pressure plasma of a second mixture gas containing an organosilane monomer. The surface treatment of the present invention is useful to efficiently produce a multilayer circuit board having excellent adhesion between the glass fabric and a resin, and resistance to CAF (Conductive Anodic Filaments).