摘要:
A parallel-structured Raman optical amplifier includes a very wide gain band for use in Coarse Wavelength Division Multiplexing (CWDM) scheme—based optical transmission. The parallel-structured Raman optical amplifier for amplifying an input optical signal of a plurality of channels having different center wavelengths received via a single optical path includes: a demultiplexer for dividing the input optical signal into a plurality of optical signals, each of which is composed of at least one channel signal having an adjacent center wavelength, and outputting the divided optical signals to different output terminals; a plurality of Raman amplifiers for performing Raman-optical amplification upon the divided optical signals received from the demultiplexer; and a multiplexer for receiving individual optical signals from the plurality of Raman amplifiers, and outputting the received optical signals via a single optical path.
摘要:
Provided are an optical transmission apparatus and method using a light source for wavelength division multiplexing (WDM) optical communication that employs a Fabry-Perot laser diode (F-P LD) whose output wavelength is locked by an externally injected incoherent light, a multifiber, and a waveguide grating router. The light transmission apparatus includes: an incoherent light source (ILS) outputting incoherent light; a plurality of circulators (CIRs) connected to the ILS, receiving the incoherent light from the ILS, and outputting first optical signals; a first waveguide grating router (WGR) outputting the first optical signals output from each of the CIRs to optical fibers corresponding to each of the CIRs, and outputting second optical signals input from the optical fibers to the corresponding CIRs; a plurality of second WGRs corresponding to each of the CIRs, and demodulating the second optical signals output from each of the plurality of CIRs; and a plurality of receivers connected to the plurality of the second WGRs, and inputting the demultiplexed optical signals output from the plurality of second WGRs. A plurality of light sources for WDM optical communication whose output wavelength is locked can increase size and economical efficiency of a light transmission system (subscriber). The N×N WGR can produce a conventional light transmission system and accommodate many subscribers.
摘要:
Various apparatus and methods are provided for lubricating hard memory disks. A mandrel is provided in one embodiment with three rows of teeth and provides a stable, three-point engagement with the inside edge of the disks at the center aperture. When removing disks from a cassette, the mandrel preferably places a uniform space between the disks. In a second embodiment, the mandrel may be used to lubricate single-sided hard memory disks. The single-sided hard memory disk may be positioned on the mandrel in pairs in a gap merge orientation, or equally spaced apart.
摘要:
Disclosed is a vehicle using wind force. An object of the present invention is to provide a wind force power system driven by wind is provided within a hood panel of the vehicle, whereby the vehicle continuously charge a battery with electricity while being stopped or driving. The vehicle using wind force includes a wind force power system, the Power system comprising a ventilator that is rotated by the wind flowing along the roof panel in the rear of the vehicle, a shaft connected to the ventilator, a rotary gear connected to the shaft, a follower gear engaged with the rotary gear, and an electric generator for generating electricity as the follower gear rotates, wherein the electric generator of the wind force power system is electrically connected to the battery and the battery is electrically connected to the driving motor.
摘要:
A secondary battery having an increased winding area of the electrode assembly due to an absent positive electrode terminal. An electrode plate of the electrode assembly is directly welded to the can for electrical connection and to prevent the electrode assembly from floating inside the can. The secondary battery includes a hexahedronal can having an opening formed on a side and an electrode assembly contained in the can. The electrode assembly has a first electrode plate, a separator, and a second electrode plate laminated and wound together. The first electrode plate is connected to the inner surface of the can and the second electrode plate is connected to an electrode tab extending a predetermined distance to the exterior. A cap assembly has a cap plate coupled to the opening of the can to which the electrode is welded and an electrode terminal is coupled to the electrode terminal.
摘要:
An optical pickup having a blade including a first blade in which an objective lens is mounted and which is made of a reinforced plastics material, and a second blade in which driving coils are mounted and which is made of a magnesium alloy material. Since the first blade has a low thermal conductivity coefficient, the heat generated in the coils is prevented from being transferred to the objective lens, whereas the second blade having a high thermal conductivity coefficient radiates the heat generated by the coils to the outside. Thus, the heat distortion of the objective lens can be suppressed, and damages to the coils or rigidity reduction of the blade can be avoided.
摘要:
A system and method are used to allow high speed communication between a chip and an external device. The system and method include a PLL with multiple phased outputs configured to be controlled digitally, a deskew PLL configured to align a clock of controller circuitry to interface circuitry, and a phase interpolated voltage controlled delay line configured to phase shift incoming signals. Analog design techniques of phase interpolation accurately position clocks and strobe signals that are required for high speed interfaces. The high speed interface is for transmitting and receiving signals from the external device, for example, a DDR DRAM.
摘要:
An optical head with a heat sink. The optical head includes an optical bench; a laser diode combined with the optical bench; a first heat sink combined with a lower surface of the optical bench; and a second heat sink combined with an upper surface of the optical bench. A heat-dissipation structure of the laser diode with high output may be improved.
摘要:
The present invention relates to an electrolyte for a lithium ion rechargeable battery and a lithium ion rechargeable battery including the same. The electrolyte includes a non-aqueous organic solvent, a lithium salt, and triphenyl phosphate. A lithium ion rechargeable battery including the electrolyte has improved overcharge stability and shows excellent chemical properties including reducing swelling, high-temperature storage stability, and cycle life characteristics.
摘要:
Provided is a drum type washing machine combined with a dryer and employing an improved air passage structure that can enhance the drying efficiency and drying performance, in particular, that can prevent a tub from being deformed due to heat of a heater of the drying duct. The washing machine includes: a cylindrical plastic tub having a hot air inlet formed at a front upper portion thereof and a hot air outlet formed at a rear lower portion thereof; a drum rotatably installed inside the tub; a drying duct provided with a heater and a blower fan that are mounted on an inner air passage of the drying duct and fixed to an upper predetermined portion of an outer circumference of the tub; a condensation duct for removing moisture contained in hot air exhausted through the hot air outlet of the tub; and a heat shield interposed between the tub and the drying duct, for shielding heat of the drying duct from being transferred directly to the tub.