摘要:
Provided are an apparatus and a method for interfacing a 10 Gbps small form factor pluggable (XFP) optical transceiver with a 300-pin multi-source agreement (MSA)_optical transceiver. The apparatus includes: a direct interface providing direct interfacing paths through which signals that can be directly interfaced with one another between the XFP optical transceiver and the 300-pin MSA optical transponder; and a processor converting clock signals and data between the XFP optical transceiver and the 300-pin MSA optical transponder so that formats of the clock signals and the data coincide with one another.
摘要:
A method for operating a polymer electrolyte membrane fuel cell at temperatures below the freezing point of water and an apparatus thereof are provided to prevent damage and performance degradation of the membrane-electrode assemblies. Non-humidified gas flows for several seconds before temperature of the polymer electrolyte membrane fuel cell falls below the freezing temperature of water when operation of the polymer electrolyte membrane fuel cell stops. Simultaneously, anode of the polymer electrolyte membrane fuel cell is filled with a solution having a low freezing point to prevent the temperature of a polymer electrolyte membrane fuel cell falling below the freezing point of water due to the lower ambient temperature in the winter. When the polymer electrolyte membrane fuel cell is restarted, the cell performance is not degraded reflecting that the present invention stably preserves the fuel cell.
摘要:
A multi-dimensional optical cross-connect switching system. The system is capable of multi-dimensionally using wavelength resources, such as in the forms of optical fibers, optical wavelength bands and optical wavelengths. The system can three-dimensionally use the wavelength resources by being matched with an optical transport network through the optical fiber layer, optical wavelength band layer and optical wavelength layer. In addition, the multi-dimentional optical cross-connect switching system is constructed in such a way that two cross-connect switches are symmetrically arranged and an insertion/extraction switch is added to switch addition/dropping links between the two switches.
摘要:
Disclosed is a variable optical attenuator comprising: a transmitting fiber for transmitting light; a receiving fiber concentrically placed with said transmitting fiber for absorbing light; a shutter between said transmitting fiber and said receiving fiber for absorbing light to adjust optical transmittance; and an actuator for driving said shutter. The size and price of the optical attenuator is remarkably reduced compared to a conventional mechanical connector-type attenuator to provide an article excellent in competitive edge.
摘要:
An optical packet header processing apparatus for processing a header of an optical packet expressing an address of a destination node to control a switching operation of an optical packet switch. The optical packet header processing apparatus comprises a beam splitter for splitting the optical packet header into a predetermined number of optical packet header elements, and a plurality of time interval detectors. Each of the time interval detectors receives a corresponding one of the optical packet header elements from the beam splitter and outputs a detect optical pulse if a pair of optical pulses having a predetermined time interval therebetween are present in the received optical packet header element. A plurality of optical pulse detectors are adapted to convert the detect optical pulses from the time interval detectors into electrical signals and transfer the converted electrical signals to the optical packet switch, respectively. Therefore, the optical packet switch determines the destination node in response to the electrical signals from the optical pulse detectors and outputs the optical packet to an output port corresponding to the determined destination node.
摘要:
A multichannel light source wavelength and strength stabilizing apparatus and a method thereof are disclosed. The apparatus includes a first proportional/integrator for receiving an output signal from the error detector, detecting a value proportional thereto, integrating the detected proportional value, generating a signal corresponding to the optimum feedback circuit, and outputting to the temperature controller; a current controller for providing the current capable of controlling the light strength in accordance with the signal inputted to the light source and stabilizing the light strength; a second optical coupling unit for dividing the output signal from the first optical coupling unit; a photodetector for converting the strength of a light among the output signals from the second optical coupling unit into an electrical signal; and a second proportional/integration unit for detecting a proportional value of the output signal from the optical detector, integrating the detected proportional value, generating a signal corresponding to the optimum feedback circuit, and outputting to the current controller.
摘要:
An optical switch selectively transmits an optical signal to one of multiple optical paths for use in an optical communication. The optical switch includes a mobile structure provided with a mirror surface at one end surface of the mobile structure to change the optical path by moving the mobile structure backward and forward along an axis parallel to the mirror surface. It has at least a pair of leaf springs in the form of a shallow arch, wherein each of the leaf springs is connected to both side surfaces of the mobile structure in a leaf spring axis perpendicular to the mirror surface, respectively, thereby obtaining a latch-up function and an actuator for moving the mobile structure. In the optical switch, elastic bodies are introduced into connection portions of the leaf springs, respectively, to give rise to a degree of freedom to the connection portions in the direction of the leaf spring axis. The elastic body can be an I-shape beam, a multiple spring with a curvature and an S-shape beam allowing angle deflection.
摘要:
The present invention relates to a circuit for searching a fault location in a device having a number of ASIC's, including a first BIP(Bit Interleaved Parity) generating unit, which is coupled to the input stage of the ASIC where a fault will be detected, for calculating and outputting BIP for the specific byte, which is one of overhead bytes that were already utilized, i.e., not in use in transmission line, during a certain period; a BIP extraction unit, which is in parallel connected with the first BIP generating unit, for extracting the same byte as said specific byte from overhead bytes, which are generated and inserted in the previous-stage ASIC, in order to compare with BIP inputted into the first BIP generating unit during a certain period; a BIP comparison unit for simply comparing the result outputted from the first BIP generating unit with the result outputted from the BIP extraction unit; a BIP accumulation unit for accumulating the results outputted by the BIP comparison unit; a BIP threshold interrupt processing unit for comparing the results accumulated by the BIP accumulation unit with the threshold value which is used as the reference for generating an interrrupt, and then externally outputting the compared result; a second BIP generating unit, which is coupled to the output stage of the ASIC, for calculating and then outputting BIP for all the bytes within the transmission line(HBUS) during a certain period in order to inspect the signal of HBUS to the next-stage ASIC; and a BIP inserting unit for inserting the result generated from the second BIP generating unit into the specific byte location whithin said transmission line.
摘要:
An amplifier and an amplifying method are provided. The amplifier includes: an amplifying unit amplifying and transferring a transmission target signal to a TDD switch; the TDD switch transferring a signal received from the amplifying unit to a filter unit when the amplifier operates in a TDD mode, and transferring a signal received from the filter unit to a duplex mode selection switch; the duplex mode selection switch transferring a signal received from the filter unit to a receiving side; and a controller controlling the duplex mode selection switch to transfer the signal received from the filter unit to the receiving side without passing through the TDD switch when the received duplex mode selection signal is a FDD mode selection signal.
摘要:
Disclosed is a gasket for reducing stress concentration in a fuel cell stack, which prevents damage or deformation of a separator and further prevents a position shift of the gasket by reducing stress concentration formed at a specific region by deformation of the gasket due to a compression force. In particular, the gasket includes a T-shaped or cross-shaped gasket joint to form hydrogen, air and coolant manifolds, and the gasket joint has a structure in which two joint branches forming an angle of 180° in the opposite direction to each other are joined at one point with a particular angles which reduce stress concentration formed due to compression force by deformation of the gasket.