48results about How to "Suitable for long-distance transmission" patented technology

A device applying optical fiber communication technique on data communication of photoelectric theodolite consists of orientation shaft, the first and the second connection frames, the first and the second optical collimator tail fibers, the first and the second optical collimator tube shells, the first and the second optical collimator lens sets and base of theodolite. The device not only can raise transmission rate but also can avoid electromagnetic-wave interference on signal.

The invention discloses a photonic crystal optical fiber methane sensing device based on modular interference. The device is composed of a broadband light source, an optical circulator, a photonic crystal optical fiber methane sensor cladding an air hole coated polymer sensitive film, a testing air chamber, a switching valve, a quality flow controller, a spectrum analyzer and a computer, wherein the optical fiber methane sensor consists of a single mode fiber, a photonic crystal optical fiber and a welding area of the two fibers; the adopted photonic crystal optical fiber refers to an endless single mode solid core photonic crystal optical fiber; the polymer sensitive film refers to a polycarbonate resin methane sensitive film containing a cage molecule E-(OC2H5)6, and the inner wall of the cladding air hole of the photonic crystal optical fiber is coated with the film by virtue of an air pressure driving device; when the to-be-tested methane gas acts with the sensitive film on the inner wall of the cladding air hole of the photonic crystal optical fiber, the refractive index of the sensitive film changes, the reflection interference spectrum characteristic wavelength of the sensor is moved, the average movement amount shown in the description of the reflection interference spectrum characteristic wavelength before and after contacting the sensor with the methane gas is analyzed, so that the concentration of the to-be-tested methane gas can be obtained. The device disclosed by the invention has the characteristics of high sensitivity, high stability, high selectivity and the like.

The invention provides an intelligent electricity grid, which comprises an optical-signal transmitting master station, a power-generation master station, a transformer station, a comprehensive treatment center, intelligent distribution terminals and use terminals, wherein optical signals transmitted by the optical-signal transmitting master station and electric energy of the power-generation master station are simultaneously transmitted to the transformer station through composite optical cables formed by glass optical fibers and cables, and are transmitted to the comprehensive treatment center after electric power distribution through the transformer station; and the electric energy transmitted through the composite optical cable is optimized in the comprehensive treatment center, the optical signals carried by the glass optical fibers are accessed to the Internet to carry out optical signal processing, and then the electric energy and the processed optical signals are transmitted to the intelligent distribution terminals through the composite optical cables formed by glass optical fibers and cables, and are simultaneously transmitted to the corresponding use terminals by the intelligent distribution terminals through plastic optical-fiber bunched optical cables integrated by plastic optical fibers and cables. The intelligent electricity grid provided by the invention has the advantages of low cost, high efficiency, and simpleness and easiness in maintenance.

The invention discloses a long-distance PCIe extension system and a data transmission method of the long-distance PCIe extension system. The long-distance PCIe extension system comprises a host end interface device, an extension line and an equipment end interface device, wherein the host end interface device is in the disguise of PCIe equipment according to the configuration information, sent by the equipment end interface device, of the PCIe equipment; the equipment end interface device is in the disguise of a host according to received commands; and the extension line is a high-speed connecting line and is used for receiving and sending data between the host end interface device and the equipment end interface device according to a user-defined format. According to the long-distance PCIe extension system and the data sending method of the long-distance PCIe extension system provided by the invention, an embedded system is adopted; an FPGA (Field Programmable Gate Array) does not need to be adopted for carrying out conversion on a PCIe protocol; and the system and the method have the beneficial effects of simple and convenient design and low cost, and are suitable for long-distance transmission.

The invention discloses an all-optical single side band (SSB) up conversion generator based on a silicon-based micro ring resonator, comprising a central station and a base station, wherein the central station is composed of a pumping signal optical generating system, a tri-frequency component detection signal optical generating system, a silicon-based micro ring resonator system, a first opticalamplifier, an adjustable narrow-band filter and an uplink data receiver; and the base station is composed of an optical fiber bragg grating, a photoelectric detector, a first Mach-Zehnder modulator and an uplink data source. The invention injects pumping light in a silicon-based micro ring to generate a free carrier, and the silicon-based micro ring resonance peak is subjected to blue shift due to the dispersion effect of the free carrier, so as to modulate signals on detection light to realize the all-optical single side band (SSB) up conversion. The used device has small volume and is easy to integrate; and the used SSB modulation is influenced small by optical fiber dispersion, the system cost is reduced and the system structure is simplified due to the characteristics of quad-frequency technology and needless of an uplink light source of the base station.