Abstract: Tongs for holding a cooking container includes: a body being of a shape adequate to be held by a hand and extending by a predetermined length in a longitudinal direction thereof, the body having a fixed holding part being in contact with the high-cut outer peripheral wall of the cooking container at the end portion thereof and a receiving chamber formed in the interior thereof; a movable member having a movable holding part being in contact with the high-cut inner peripheral wall of the cooking container at the end portion thereof in order to hold the cooking container in relation to the fixed holding part of the body, the movable member received within the receiving chamber and having one end connected to a spring mechanism installed in the body, thus to be disposed within the body forwardly and backwardly relative to the fixed holding part; an operating lever supported rotatably on the body at the one end thereof, thus to be inserted and drawn into/from the interior and exterior of the receiving chamber; an

Abstract: A parallel optical fiber amplifier having a configuration in which a C-band silica-based erbium-doped fiber amplifier (EDFA) stage and an L-band EDFA stage are coupled together in parallel in such a fashion that a reverse amplified spontaneous emission (ASE) light emitted from the C-band and/or L-band EDFA stage is reused as a secondary pumping source for an amplification in the L-band EDFA stage. In the optical fiber amplifier of the present invention, the reverse ASE light emitted from the C-band EDFA stage and the reverse ASE light emitted from the L-band EDFA stages supplied to the L-band EDFA stage so that they can be reused for improving the power conversion efficiency of the entire system and for reducing the noise factor thereof.

Abstract: A long-period fiber grating filter device which includes a core having refractive index modulations formed therein at every predetermined distance, a cladding surrounding the core, a coating covering the cladding portion not adjacent to the long-period fiber gratings, a recoating covering the cladding portion adjacent to the long-period fiber gratings, a long-period fiber grating where a coupling wavelength exhibits a negative wavelength shift with respect to temperature change according to the amount of a dopant added to the core, and a recoating material where the refractive index decreases with temperature increase and the coupling wavelength exhibits a positive wavelength shift by the effect of the recoating material, wherein the negative wavelength shift in long-period fiber grating itself and the positive wavelength shift by the effect of the recoating material balance each other to eliminate temperature control in the long-period grating filter device.

Abstract: A diversity antenna distance determining method in radio telecommunications base station is provided. The method comprising the step of determining an allowable correlation coefficient of signals received through the first and the second antennas in a first frequency band which provides good diversity performance; determining a first distance d1 between the antennas which satisfies the determined correlation coefficient in the first frequency band; and, determining a second distance d2 between the two antennas based on d1 in a second frequency band, which is different from the first frequency band. In the present invention, an optimal distance between antennas at one frequency is calculated using the data measured at another frequency to compensate the fading within a coverage area.

Abstract: A disk antenna for use in a PCMCIA card or the like having a disk made from conventional moldable plastics and a radiating element that has a low capacitive impedance relative the inductance of the antenna feed such that the tuning element is capacitive. The disk antenna maximizes the ratio of bandwidth to disk size by maximizing the surface area of the radiating element. The antenna is application specific in that it can be adapted for various environmental resonant variations.

Abstract: The present invention relates to a modulated signal generator for testing the working functions of a wideband code division multiple access (CDMA) in a wireless local loop (WLL) system.

Abstract: A long-band optical fiber amplifier with enhanced power conversion efficiency including a first optical fiber part provided with a pumping light source, a second optical fiber part connected with the first optical fiber part, the second optical fiber part being not provided with the pumping light source, and a reuse circuit coupled between the first optical fiber part and the second optical fiber part for utilizing amplified spontaneous emission (ASE) as a secondary pumping light source from the first optical fiber part. Preferably, the reuse circuit comprises a WDM coupler connected between the first and second optical fiber parts, and a light pumping device connected with the WDM coupler to provide the pumping light source. The first and second optical fiber parts consist of erbium-doped optical fiber, and the erbium-doped optical fiber is adjusted so as to produce a gain in the L-band.

Abstract: A method for adding frequency assignment in a mobile telecommunication system is disclosed. The method according to the present invention includes a step of getting a mobile station to receive the communication services through the presently serviceable FAs in such a way that the BTS transmits the channel list including the information of the presently serviceable FAs to the mobile station; a step of adding a new FA by the BTS; a step of generating a first channel list having only information for the added FA; a step of optimizing the new FA by getting the operating mobile station to be provided with the communication services through only the new FA; a step of generating a second channel list including the information of all FAs, which are presently serviceable by the BTS and the new FA after completion of the optimization of the new FA; and, a step of getting the mobile station to be provided with the communication services through all the FAs to the mobile station based on the second channel list.

Abstract: An optical wavelength multiplexer/demultiplexer, capable of exhibiting flat spectral response characteristics while minimizing insertion loss, is proposed. The optical wavelength multiplexer/demultiplexer, used in WDM systems, includes a first slab waveguide for dividing powers of input optical signals coupled from the input optical waveguides, an arrayed waveguide grating for guiding the optical signals from the first slab waveguide therethrough in such a fashion that the optical signals have constant phase difference in neighboring waveguides, a second slab waveguide in which the optical signals from the arrayed waveguide grating converge into the focal positions according to their wavelengths, and a taper waveguide interposed between the second slab waveguide and output waveguides and adapted to obtain a flat spectral response while minimizing an insertion loss.

Abstract: The present invention discloses a method for improving a call quality by increasing the output of a mobile station over the reverse link by adjusting threshold range of a system's predetermined E.sub.b /N.sub.o value in the event that the transmission output of the mobile station is stopped in a reverse power control of a cellular system, and by comparing the measured E.sub.b /N.sub.o ratio to a predetermined threshold E.sub.b /N.sub.o ratio to increase/decrease the mobile station transmit power. The method includes steps of adjusting the predetermined threshold E.sub.b /N.sub.o ratio by monitoring the call quality in a forward frame, and repeatedly increasing/decreasing the mobile station transmit power accordingly.