37results about How to "Guaranteed high-quality transmission" patented technology

In an optical transmission system: a first unit generates a first optical supervisory signal being arranged on the shorter-wavelength side of main signals and containing information for determining continuity of an optical transmission line and a second optical supervisory signal arranged on the longer-wavelength side of the main signals and used for supervisory control of optical communication; a second unit generates a wavelength-multiplexed signal by optically multiplexing the main signals and the first and second optical supervisory signals, and transmits the wavelength-multiplexed signal onto the optical transmission line; a third unit receives the wavelength-multiplexed signal, and optically demultiplexes the wavelength-multiplexed signal into the main signals and the first and second optical supervisory signals; and a fourth unit determines whether or not the optical transmission line is optically continuous, based on the first optical supervisory signal, and performs supervisory control of optical communication based on the second optical supervisory signal.

A disclosed surface emitting laser is capable of being manufactured easily, having a higher yield and a longer service lifetime. In the surface emitting laser, a selectively-oxidized layer is included as a part of a low refractive index layer of an upper semiconductor distribution Bragg reflector; the low refractive index layer including the selectively-oxidized layer includes two intermediate layers adjoining the selectively-oxidized layer and two low refractive index layers adjoining the intermediate layers. Al content rate in the intermediate layers is lower than that in the selectively-oxidized layer, and Al content rate in the low refractive index layers is lower than that in the selectively-oxidized layer. This configuration enables providing more control over the thickness and oxidation rate of the oxidized layer, thereby enabling reducing the variation of the thickness of the oxidized layer.

A graphic display control system is disclosed. The graphic display control system comprises a server computer comprising a memory unit, a graphic display controller accessing image data displayed on the server computer and a cursor information and thereby storing the image data and the cursor information in the memory unit, a compression engine performing an image compression of the image data displayed on the server computer except a cursor pattern data of the cursor information to generate an compressed image data and thereby storing the compressed image data in the memory unit, a network controller receiving the compressed image data and the cursor information from the memory unit and transmitting the compressed image data and the cursor information through a network, and a remote client computer comprising a memory unit, a network controller receiving the compressed image data and the cursor information through the network and storing the compressed image data and the cursor information in the memory unit of the remote client computer, a decompression engine performing an image decompression of the compressed image data in the memory unit of the remote client computer to generate a decompressed image data and storing the decompressed image data in the memory unit of the remote client computer, a graphic display controller receiving the decompressed image data and displaying the decompressed image data on the remote client computer, and a cursor pattern overlay controller receiving the cursor information and overlaying the cursor information on the decompressed image data.

A transmitting device of the present invention comprises an encoder (20), a transmitting unit (100) including and a pulse generator (30) and a parallel-to-serial converter (50), a transmitting control unit (40), and an a antenna (90) The pulse generator (30) comprises a first pulse train generator (31), a second pulse train generator (32), and an n-th pulse train generator (33) A k-bit information bit train is inputted from the information signal source (10) The encoder (20) encodes the k-bit information bit train into an n-bit encoded bit train at a coded rate of (k/n) The pulse generator (30) generates n-piece repetitive pulse trains corresponding to the n-bit encoded bit train The antenna (90) transmits the n-piece repetitive pulse trains as UWB-IR.

In a wireless communication system including a plurality of wireless stations provided in a structure having a radio wave shield arranged at a fixed position, at least one of two wireless stations using an identical wireless channel and two wireless stations using wireless channels adjacent to each other are allocated on both sides of the radio wave shield, respectively. In this case, the structure is an aircraft, and the two wireless stations are allocated on different aisles of the aircraft, respectively. In addition, the two wireless stations are allocated to be apart from each other in a longitudinal direction of the aircraft.

Disclosed is a semiconductor device which performs signal transmission by using inductor coupling. The semiconductor device comprises one or more transmission and reception coil pair, each pair comprising a single transmission coil and a plurality of reception coils, or a plurality of transmission coils and a single reception coil, or a plurality of transmission coils and a plurality of reception coils.

A cable for the transmission of signals, includes a plurality of leads, on whose inner conductors an electrically conductive end piece is affixed. At least one of the end pieces includes a first latching element. The cable includes a coupler element, and the coupler element has a body having a longitudinal axis. In addition, the body has parallel feed-throughs, electrically insulated from each other, to accommodate the end pieces. At least one of the feed-throughs includes a second latching element. The end piece is inserted into the feed-through such that the first latching element locks into place with the second latching element. The body furthermore has a first surface and a second surface to guide a mating piece of the coupler element, the first surface having a radially outwardly directed normal vector, and the second surface having a radially inwardly directed normal vector.

The invention discloses an aerospace-used star quad communication cable and a manufacturing method thereof. The aerospace-used star quad communication cable comprises a cable core; and the cable core is sequentially coated with a wrapping layer, a shielding layer and a sheath. The aerospace-used star quad communication cable is characterized in that four core wires are paired and are subjected to star quad with a filling strip as a center to form the cable core; a multi-core inner conductor is wrapped with an insulated layer to manufacture each core wire; the insulated layer has a two-layer structure, the inner insulated layer is a microporous polytetrafluoroethylene thin film, and the outer insulated layer is a polytetrafluoroethylene green tape; the shielding layer has a silver-plated copper wire double-layer braided structure; and both the sheath and the filling strip are made of an ethylene-tetrafluoroethylene copolymer. The aerospace-used star quad communication cable provided by the invention can perform gigabit transmission, and has the advantages of high radiation resistance, high electromagnetic shielding performance, light weight, good flexibility, high temperature resistance, low delay, low attenuation, impact resistance and the like.

This invention provides an optical transmission system which allows to perform high-quality transmission of each of a plurality of signal channels multiplexed. In the optical transmission system, signal light in which a plurality of signal channels with an optical frequency spacing of 400 GHz or more but 12.5 THz or less is transmitted from an optical transmitter to a Raman amplifier through an optical fiber transmission line. In the Raman amplifier, pumping light from a pumping light source unit is supplied to an optical fiber through an optical coupler. The multiplexed signal light inputted to the Raman amplifier arrives at the optical fiber through an optical isolator and optical coupler, and Raman-amplified by the optical fiber. The Raman-amplified multiplexed signal light is outputted from the Raman amplifier through an optical coupler and optical isolator.

In an optical transmission system, an optical terminal transmits a plurality of tone signals corresponding to a plurality of gain bands, where the frequencies of the plurality of tone signals are different from each other, and each of the plurality of tone signals has a characteristic which is varied according to detected power of optical signals in the corresponding gain band. Each optical repeater receives the plurality of tone signals, extracts the characteristics of the plurality of tone signals, and compares a signal representing each characteristic with a reference signal. The optical repeater controls the gains of optical amplification in the plurality of gain bands based on the comparison result so as to equalize the gains in the plurality of gain bands.

The invention provides a computer, an external device thereof and a radio transmission method of service data. The computer comprises a data acquisition module, a first service data processing module,a second service data processing module and a transmission module, wherein the data acquisition module is used for acquiring and processing service data comprising first service data and second service data; the first service data processing module is connected with the data acquisition module and used for generating first protocol data; the second service data processing module is connected withthe data acquisition module and used for generating second protocol data; and the transmission module is respectively connected with the first service data processing module and the second service data processing module and used for transmitting the first protocol data and the second protocol data. The invention ensures the bandwidth for video service data signal transmission based on a radio technology and also ensures the normal working of other service data.

Provided is an optical fiber cable which allows for high-quality signal transmission in short-distance transmission. The optical fiber cable is designed for use in optical communication based on transmitting an optical beam from a light-emitting device, to a light-receiving device. The optical fiber cable has: a proximal end which is one end thereof on the side of the light-emitting device, and a distal end which is the other end thereof on the side of the light-receiving device, wherein an optical beam returning from the side of the distal end toward the side of the light-emitting device has an M² factor of 1.7 or more; and a length of 50 m or less.

In an optical transmitter-receiver module for performing optical transmission and reception by using a single-core optical fiber, a light-tight partition plate unit 506 for separation between an optical path of a transmission signal light and an optical path of a reception signal light is held between a jack section 508 for detachably holding an optical plug 240 and a light emitting/receiving unit 505 having an LED 514 and a PD 515 positioned and fixed in place and molded in one piece.

The invention belongs to the technical field of circuit board manufacturing, and particularly relates to a high-precision ultrathin PCB preparation method which comprises the following steps: forminga mask on the surface of a substrate; etching the mask according to a pre-designed printed circuit trend to form a pattern with a concave region and a convex region; injecting a nickel-based metal ionpolyethylene glycol methacrylate resin mixture into the sunken area to form a priming coat; depositing Cu layers on the surface of the priming coat and the convex region; removing the Cu layer located in the convex region and the residual mask; and forming a flat insulating layer to obtain the high-precision ultrathin PCB. Polyethylene glycol methacrylate resin is added to form a mixture with nickel-based metal ions, so that the bonding strength of a priming coat and a base material is improved, the Cu layer is deposited on the priming coat, the bonding strength of the Cu layer and the priming coat is enhanced, the bonding strength of a copper circuit and the base material is finally realized, and the problem of short circuit or open circuit caused by tilting of the copper circuit does not exist. High-quality transmission of PCB signals is ensured.