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| Number | Title | Issue Date |
| 6714341 | Wavelength converter and optical cross-connect system using the same This invention provides a wavelength converter and an optical cross-connect system using the same. The inventive system enables one multi-wavelength light source to provide each wavelength converter with the necessary tuned wavelength, without using individual light... | 03/30/2004 |
| 6698054 | Method for fabricating high-purity silica glass using sol-gel processing Disclosed is a method for fabricating high-purity silica glass using a sol-gel processing that includes the steps of: (a) mixing a deionized water with a fluorine compound and a dispersion agent to prepare an aqueous premix solution; (b) mixing the aqueou... | 03/02/2004 |
| 6684033 | Bit rate detection circuit and algorithm for optical networks A receiver in an optical network with a bit rate detection circuit for automatically detecting input signal data bit rates to automatically adjust the frequency of a voltage controlled oscillator in the receiver is disclosed. The receiver has a data rate ... | 01/27/2004 |
| 6680911 | Device for controlling data flow in ethernet and method thereof An apparatus and method for controlling the data flow of the Ethernet hub in a half-duplex mode, wherein the hub includes a switch to control data packets flowing through a plurality of communication ports. The system includes a destination address (DA) d... | 01/20/2004 |
| 6678451 | Multimode optical fiber having a structure to reduce scattering loss Disclosed is a multimode optical fiber having a structure to reduce scattering loss which includes a core divided into a central region having the optimal refractive index according to an optimal core shape index minimizing the scattering loss of the mult... | 01/13/2004 |
| 6678433 | Apparatus and method for measuring residual stress and photoelastic effect of optical fiber An apparatus and method for measuring residual stress and photoelastic effect of an optical fiber is disclosed. The apparatus includes a rotating light diffuser for providing temporally averaged uniform image by restraining spatial coherence of light emit... | 01/13/2004 |
| 6677555 | Optical device module using integral heat transfer module An optical device module using an integral heat transfer module. The heat transfer module has an integrally formed heat source and a temperature sensor for reading temperature. A heat transfer path is simplified in packaging the optical device module, so ... | 01/13/2004 |
| 6676846 | Device and method for fabricating diffractive gratings There is provided a grating fabrication device and method to form gratings on a semiconductor substrate. The substrate is loaded into a reactor filled with an etchant solution, and an array of parallel light of interference light with different periods is... | 01/13/2004 |
| 6674723 | Apparatus and method of monitoring a queue state in an asynchronous transfer mode switch Disclosed is an apparatus and method of monitoring the queue state of a switch in the subscriber board of an asynchronous transfer mode switching system. A difference value between the present time value and a previous input time value stored in a memory ... | 01/06/2004 |
| 6674570 | Wide band erbium-doped fiber amplifier (EDFA) An optical amplifier with improved output power utilizing less optical fiber components and reduced noise is disclosed. A first optical fiber amplifier is pumped by a first light source prior to splitting into a number of sub-bands, and a second optical f... | 01/06/2004 |
| 6674250 | Backlight including external electrode fluorescent lamp and method for driving the same The present invention discloses a backlight including external electrode fluorescent lamps and a method for driving the backlight. The backlight includes fluorescent lamps having external electrodes made of an electrically conductive material for wrapping... | 01/06/2004 |
| 6671506 | Mobile communication system for home-zone service and method thereof A mobile communication system for providing a home zone service and a method thereof. In the mobile communication system, a home zone signal generator generates a home zone signal, a mobile radio terminal receives the home zone signal and determines wheth... | 12/30/2003 |
| 6664573 | Avalanche photodiode An avalanche photodiode capable of generating a minimal surface leakage current as well as achieving a uniform electrical field. The avalanche photodiode includes a semiconductor substrate provided with a lower electrode underneath it, an amplification la... | 12/16/2003 |
| 6661569 | Semiconductor optical amplifier module with monitoring device The present invention discloses a semiconductor optical amplifier module with a monitoring device. The amplifier module includes a housing having a window on both sides of the opposite walls for forming a path of a first optical fiber and a second optical... | 12/09/2003 |
| 6660672 | Alkali halide-doped sulfide glasses for optical amplifier and fabricating method thereof There is provided alkaloid halogen-doped sulfide glasses for an optical amplifier and a fabricating method thereof. An alkaloid halogen-doped sulfide glass is formed of silica doped with a Ge--Ga--S three-component system, Pr3+, and an alkaloid... | 12/09/2003 |
| 6647181 | Long period fiber grating package There is provided a package for holding long-period fiber gratings formed on an optical fiber from which an outer coating is partially removed to form the gratings thereon. A recoating is then applied to the long-period fiber gratings to maintain the opti... | 11/11/2003 |
| 6647162 | Apparatus and method for measuring residual stress and photoelastic effect of optical fiber Disclosed is an apparatus for measuring a residual stress and a photoelastic effect of an optical fiber, which includes: a light source; a rotary type optical diffuser distanced from the light source in a predetermined distance for suppressing the spatial... | 11/11/2003 |
| 6646796 | Wide band erbium-doped fiber amplifier (EDFA) The proposed amplifier structure and associated method of optical signal amplification efficiently utilizes the limited length of rare earth-doped optical amplifier. A multi-stage of amplification stages, which includes a first erbium-doped fiber amplifie... | 11/11/2003 |
| 6633425 | Electro-absorption typed optical modulator An improved electro-absorption semiconductor modulator using an external modulation, in which a multi-quantum well (MQW) structure for absorbing a light beam is provided to increase an optical absorption capability according to an electric field, thus inc... | 10/14/2003 |
| 6631266 | Method for calculating the coverage area according to the antenna patterns in a sector base station A method for determining a coverage area according to antenna patterns in a sector base station system provided that the antenna gain of the omni base station is identical to the antenna gain of the sector base station. The method includes the steps of ca... | 10/07/2003 |
| 6631262 | Method for updating sector list of home zone database for home zone service A method for adding to a sector list substitute information about a sector excluded from the sector list due to low strength of a corresponding PN signal transmitted from a base station. The coordinates of adjacent bins relative to the location of the mob... | 10/07/2003 |
| 6628944 | Apparatus for constructing a zone data base for home zone service and method therefor A method for constructing a zone database for providing home zone services to the subscribers of a mobile communications system, comprises the steps of dividing a service area into a plurality of home service zones; simulating the communication coverage o... | 09/30/2003 |
| 6628863 | Long-period optical fiber grating Disclosed is a long-period optical fiber grating according to the present invention. The long-period optical fiber grating includes a plurality of sections. The sections have a different grating periodicity. The distribution of the grating periodicity is ... | 09/30/2003 |
| 6628613 | Flow control method in packet switched network A flow control method in an Ethernet switch being a downstream device using a full duplex mode in a packet switched network of the type having a plurality of input ports connected to a plurality of Ethernet switches being upstream devices and a common mem... | 09/30/2003 |
| 6625473 | Method of sharing load in mobile switching system Disclosed is a method of sharing a load and processing a half call in a mobile switching center which includes the steps of: processing a calling party's half call to designate a high-ranked processor determined by the call distinct code of a request mess... | 09/23/2003 |
| 6625279 | Apparatus and method of estimating echo path delay Disclosed is an echo path delay estimating apparatus and method for estimating the echo path delay using decimators and an adaptive filter, so that a short computation time is used by the echo canceller. The apparatus comprising: a first low pass filter f... | 09/23/2003 |
| 6625137 | Method for operating supplemental code channel for high speed data service in radio telecommunication system A method for operating the supplemental code channels (SCC) for a high-speed data service in a radio telecommunication system, which includes the steps of connecting a call between a mobile station and a base station; sending, by the mobile station, the n... | 09/23/2003 |
| 6624080 | Method of fabricating nickel etching mask There is provided a metal etching mask fabrication method. Chrome is first sputtered on a silica layer and a photoresist, which is thicker than the chrome layer, is deposited on the chrome layer. The photoresist layer is patterned, a first nickel is sputt... | 09/23/2003 |
| 6624054 | Multi-layer structure for reducing capacitance and manufacturing method thereof The invention relates to a multi-layer structure used in an optical communication field and its manufacturing method in which the capacitance effect between the metal patterns of a Silicon Optical Bench (SiOB) is significantly reduced. The multi-layer str... | 09/23/2003 |
| 6600863 | Method for fabricating alloy-coated optical fiber An alloy-coated optical fiber and a fabricating method. In the alloy-coated optical fiber, a core is formed of a light transmitting material, a clad surrounds the outer circumferential surface of the core, and an indium-tin-silver coating layer is formed ... | 07/29/2003 |
| 6597918 | Apparatus and method for transmitting/receiving long message in digital portable terminal There are provided an apparatus and method for transmitting/receiving a long message by SMS (Short Message Service) in a digital portable terminal. Upon request of the SMS message transmission, a message inputted by a user is read. The read message is div... | 07/22/2003 |
| 6597910 | Method for making network direct system selection in a cellular communication system A method for performing the network direct system selection (NDSS) of a mobile station (MS) in a cellular communications system that includes the steps of: making a base station (BS) to include a dialed phone number designated for the NDSS in a CM SERVICE... | 07/22/2003 |
| 6588229 | Method for controlling heat treatment in process of fabricating high purity silica glass Disclosed is a method for controlling a heat treatment in the process of fabricating a high purity silica glass via a sol-gel process using a low temperature heater having an inhalation line and an exhaust line. Accordingly, the method includes the steps ... | 07/08/2003 |
| 6584323 | Control device for displaying a short message in real time in a digital mobile station and method therefor A control device for displaying the received short public notice or advertisement message in real time in a digital mobile station, which is equipped with a short message service (SMS) function, comprising a volatile memory for temporarily storing the sho... | 06/24/2003 |
| 6580553 | Automatic gain control device of optical fiber amplifier An automatic gain control device of an optical fiber amplifier that outputs a compensation signal to control a gain value of the optical fiber amplifier is disclosed. The device includes: a first optical detector for partially converting an input optical ... | 06/17/2003 |
| 6580263 | Bit rate discrimination device with temperature compensation function Disclosed is a bit rate discrimination device that accurately discriminates a bit rate regardless of variations in the operating temperature. A photoelectric converter converts an input optical signal into an electric signal, and a bit rate detector detec... | 06/17/2003 |
| 6577674 | Channel compensator for DS-CDMA receiver A channel compensator for estimating and for compensating a phase change and a residual frequency offset of a despreaded signal, prior to synchronous demodulation in a DS-CDMA receiver. In the channel compensator, a first integrator accumulates input sign... | 06/10/2003 |
| 6574410 | Planar light waveguide circuit with landmarks A planar light waveguide circuit includes a plurality of landmarks arranged on the planar light waveguide circuit at intervals of a specific gap starting from a cut section of the planar light waveguide circuit so as to increase the uniformity of a coupli... | 06/03/2003 |
| 6574196 | Circuit call generator for testing functions of interworking function system and method therefor A circuit call generator (load box) for functional testing of interworking function (IWF) system and a method for testing the functions of the IWF system are provided. The circuit call generator includes a trunk interface unit for performing communication... | 06/03/2003 |
| 6570686 | Reference wavelength providing device for performance monitor in WDM optical transmission system A device for providing a reference wavelength which is used in monitoring the performance of a WDM optical transmission system which includes a light emitting diode (LED) generating light in a predetermined wavelength band, a filter receiving the light fr... | 05/27/2003 |
