Patents by Inventor Byoung-whi Kim
Byoung-whi Kim has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9341770Abstract: An optical fiber connector embedded with a Bragg grating includes: a ferrule formed with a reception unit for inserting and fixing a temperature compensation connection port from one end, a space unit extended from the reception unit toward inside, and an optical fiber insertion hole penetrating a side surface of the other end along a center of an axial direction from an inclined surface gradually narrowed toward inside of the space unit; the temperature compensation connection port formed with a connection unit contacting with the reception unit of the ferrule, an optical fiber support unit having an outer diameter smaller than an inner diameter of the space unit of the ferrule from the connection unit and protruding to be spaced apart from an inlet of the ferrule by a predetermined distance to form a space for accommodating the Bragg grating and support an optical fiber, and the optical fiber insertion hole penetrating both ends along the center of the axial direction to insert the optical fiber; an opticalType: GrantFiled: April 28, 2011Date of Patent: May 17, 2016Assignee: MEL TELECOM INC.Inventors: Byoung Whi Kim, Mahn Yong Park, Gil Dong Lee, Geon Jeong
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Patent number: 9008513Abstract: The present invention proposes a wavelength division multiplexing-passive optical network (WDM-PON) system which transmits downstream data to an optical network unit (ONU) as an optical line termination (OLT) receives seed light from a spectrum-sliced external light source module. One characteristic of the proposed WDM-PON system is that optical transmitters of the OLT and ONU are operated regardless of optical wavelength. Another characteristic of the proposed WDM-PON system is that a conventional TDMA-PON (E-PON or G-PON) ONU can be accommodated without a change.Type: GrantFiled: October 16, 2008Date of Patent: April 14, 2015Assignee: Electronics and Telecommunications Research InstituteInventors: Byoung Whi Kim, Han Hyub Lee, Jie Hyun Lee, Bong Tae Kim
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Patent number: 8705969Abstract: An optical backhaul network for a wireless broadband service is provided. The optical backhaul network for a wireless broadband service includes: a plurality of optical network units for outputting an uplink optical signal having a multiplexed wavelength; an optical line termination for outputting a downlink optical signal of a single mode in order to transmit the downlink optical signal to the plurality of the optical network units in a broadcasting form; and a plurality of remote nodes for outputting a part of the downlink optical signal to the plurality of the optical network units and for outputting the uplink optical signal to the optical line termination. Therefore, one center and a plurality of access points can be efficiently connected.Type: GrantFiled: July 7, 2008Date of Patent: April 22, 2014Assignee: Electronic and Telecommunications Research InstituteInventors: Byoung Whi Kim, Han Hyub Lee, Man Yong Park, Bong Tae Kim
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Patent number: 8649691Abstract: Disclosed are an apparatus and method for detecting optical signals. The optical signal detection apparatus includes: a signal receiver to convert a received optical signal into an electrical signal; a threshold decision unit to establish a mathematical model based on the electrical signal and to decide an optimized threshold value based on the mathematical model; and a signal detector to detect the electrical signal based on the optimized threshold value. Hence, since threshold values optimized adaptively according to received signals are used, a bit error rate may be lowered and accordingly detection performance may be improved.Type: GrantFiled: January 14, 2010Date of Patent: February 11, 2014Assignee: Electronics and Telecommunications Research InstituteInventors: Eui-suk Jung, Dong-min Seol, Byoung-whi Kim, Sang-soo Lee, Seung-hyun Cho
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Patent number: 8644711Abstract: In a Wavelength-Division-Multiplexed Passive Optical Network (WDM-PON) utilizing a conventional downstream optical signal reusing method, there is an inventory problem that different optical transmitter types need to be provided for the operation, management, replacement, etc. of a system. A WDM-PON system according to the present invention, includes: a seed light (SL) unit generating a seed light whose wavelength intervals and center wavelengths are adjusted using at least one seed light source; an optical line terminal (OLT) receiving the wavelength-multiplexed seed light from the seed light unit, transmitting a downstream optical signal to a subscriber of the WDM-PON, and receiving a upstream optical signal from the subscriber; and an optical network unit (ONU) receiving the downstream optical signal from the OLT, flattening and modulating the downstream optical signal with upstream data so that the downstream optical signal is reused for carrying upstream data.Type: GrantFiled: July 6, 2007Date of Patent: February 4, 2014Assignee: Electronics and Telecommunications Research InstituteInventors: Byoung-Whi Kim, Manyong Park, Woo-Ram Lee, Bong-Tae Kim, Seung-Hyun Cho, Jie-Hyun Lee, Geon Jeong, Chulyoung Kim, Dae-Ung Kim, Byung-Yong Kang
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Patent number: 8494366Abstract: Provided are a wavelength division multiplexing-passive optical network (WDM-PON) in which a reflective semiconductor optical amplifier (RSOA) is used as each optical transmitter of an optical line termination (OLT) and an optical network unit (ONU) and additional spectrum-sliced light is injected into RSOAs of each of the OLT and the ONU, and a WDM-PON that is combined with time division multiple access (TDMA) technology, by which the number of included ONUs increases and conventional TDMA ONUs can be used.Type: GrantFiled: December 16, 2008Date of Patent: July 23, 2013Assignee: Electronics and Telecommunications Research InstituteInventor: Byoung Whi Kim
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Patent number: 8488977Abstract: Provided is a time division multiple access over wavelength division multiplexed passive optical network (TDM-over-WDM-PON) system. According to the TDM-over-WDM-PON system, a downstream optical signal is separated according to a wavelength in a remote node, transmitted to an optical amplifying device located in subscriber equipment, amplified in the optical amplifying device, transmitted back to the remote node, and then transmitted to the subscriber equipment. Also, an upstream optical signal is transmitted to a wavelength converting device located in the subscriber equipment from the remote node, wavelength-converted in the wavelength converting device, returned back to the remote node, and then transmitted to a central office.Type: GrantFiled: August 14, 2008Date of Patent: July 16, 2013Assignee: Electronics and Telecommunications Research InstituteInventors: Byoung Whi Kim, Han Hyub Lee, Bong Tae Kim
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Patent number: 8422124Abstract: A spectrum-sliced seed light module for a wavelength division multiplexing passive optical network (WDM PON) is provided. The seed light module includes an optical amplifier to amplify seed light, an optical wavelength filter to transmit broadband light, which is output in opposite direction to an output direction of the seed light, at periodic frequency intervals, and a reflective mirror to reflect light which is spectrum-sliced through the optical wavelength filter to the optical wavelength filter.Type: GrantFiled: September 3, 2009Date of Patent: April 16, 2013Assignee: Electronics and Telecommunications Research InstituteInventors: Han-hyub Lee, Byoung-whi Kim, Jea-hoon Yu, Mahn Yong Park, Jai-sang Koh
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Publication number: 20130044984Abstract: An optical fiber connector embedded with a Bragg grating includes: a ferrule formed with a reception unit for inserting and fixing a temperature compensation connection port from one end, a space unit extended from the reception unit toward inside, and an optical fiber insertion hole penetrating a side surface of the other end along a center of an axial direction from an inclined surface gradually narrowed toward inside of the space unit; the temperature compensation connection port formed with a connection unit contacting with the reception unit of the ferrule, an optical fiber support unit having an outer diameter smaller than an inner diameter of the space unit of the ferrule from the connection unit and protruding to be spaced apart from an inlet of the ferrule by a predetermined distance to form a space for accommodating the Bragg grating and support an optical fiber, and the optical fiber insertion hole penetrating both ends along the center of the axial direction to insert the optical fiber; an opticalType: ApplicationFiled: April 28, 2011Publication date: February 21, 2013Inventors: Byoung Whi Kim, Mahn Yong Park, Gil Dong Lee, Geon Jeong
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Patent number: 8320763Abstract: In the manufacture and application of a PLC-ECL type wavelength tunable light source, provided is a wavelength tunable mechanism with improved performance and stability, a light source with improved packaging performance and mass productivity, and a light source applied to a WDM-PON with initialization and stabilization functions. The wavelength tunable light source having a PLC (planar lightwave circuit)-ECL (external cavity laser) structure includes a first housing in which a semiconductor optical gain medium is mounted, a second housing in which a PLC device is mounted, and a third housing in which an optical fiber is mounted. The first, second, and third housings make an optical axis alignment through an optical coupling lens and combined in a laser welding method.Type: GrantFiled: October 31, 2007Date of Patent: November 27, 2012Assignee: Electronics and Telecommunications Research InstituteInventors: Byoung-Whi Kim, Manyong Park, Kyung-Hyun Park, Hyun-Ho Yun
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Patent number: 8285143Abstract: In a method of allocating a bandwidth of a passive optical network, downward data are transmitted by varying a wavelength based on a wavelength division method and upward data are transmitted using a time division method. Thereby, by efficiently allocating a network bandwidth, data can be transmitted and by realizing statistical multiplexing, transmission efficiency can be improved.Type: GrantFiled: September 19, 2008Date of Patent: October 9, 2012Assignee: Electronics and Telecommunications Research InstituteInventors: Tae Yeon Kim, Kang bok Lee, Eui Suk Jung, Jea Hoon Yu, Byoung Whi Kim
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Publication number: 20120121252Abstract: Provided is an optical communication system including: a remote control device for generating OAM (Operation, Administration, and Maintenance) signal including OAM information for equipment, converting the OAM signals to OAM optical signals, overlaying the OAM optical signals and communication upstream signals transmitted to a Communication Stations device, and controlling the transmission of the overlaid signals to the Communication Stations device; and the Communication Stations device for generating OAM control signals, converting the OAM control signal to OAM optical control signals, overlaying the OAM optical control signals and optical communication downstream signals transmitted to the remote control device, and controlling the transmission of the overlaid control signals to the remote control device.Type: ApplicationFiled: July 23, 2009Publication date: May 17, 2012Applicant: MELInventors: Byoung Whi Kim, Mahn Yong Park, Hyun Ho Yoon
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Publication number: 20120099611Abstract: Provided is a wavelength tunable external cavity semiconductor laser module by a thermo-optic effect of a semiconductor optical waveguide. The wavelength tunable external cavity semiconductor laser module includes: a light source generating wideband light; a semiconductor optical waveguide having one end optically coupled to the light source; a Bragg grating formed on the optical waveguide; a thin film heater provided at an upper portion of the Bragg grating and controlling a reflection band of the Bragg grating by a thermo-electric effect; a first temperature sensor provided at an upper portion of the optical waveguide; a thermoelectric cooler (TEC) provided at a lower portion of the optical waveguide; a heat insulating layer provided between the optical waveguide and the TEC; and an optical fiber optically coupled to the other end of the optical waveguide.Type: ApplicationFiled: June 15, 2009Publication date: April 26, 2012Applicant: MELInventors: Byoung Whi Kim, Mahn Yong Park, Geon Jeong
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Patent number: 8125707Abstract: A Reflective Semiconductor Optical Amplifier (RSOA) for compensating for light loss in an optical link, an RSOA module for improving polarization dependency using the RSOA, and a Passive Optical Network (PON) for increasing economical efficiency and practical use of a bandwidth using the RSOA are provided. The PON includes a central office comprising a plurality of optic sources transmitting a downstream signal and a plurality of first receivers receiving an upstream signal; at least one optical network terminal (ONT) including a second receiver receiving the downstream signal and an RSOA which receives the downstream signal, remodulates the downstream signal into the upstream signal, and transmits the upstream signal in loopback mode; and a remote node interfacing the central office with the ONT. The upstream signal and the downstream signal are transmitted between the remote node and the ONT via a single optical fiber. The remote node includes an optical power splitter at its port connected to the ONT.Type: GrantFiled: May 4, 2010Date of Patent: February 28, 2012Assignee: Electronics and Telecommunications Research InstituteInventors: Byoung Whi Kim, Mahn Yong Park, Woo-Ram Lee, Tae Yeon Kim
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Patent number: 8086102Abstract: Provided is a passive optical network (PON) based on a reflective semiconductor optical amplifier (RSOA). In the PON, seed-light-injection RSOAs are used in an optical line terminal (OLT) to achieve the color-less management of the wavelengths of OLT optic sources, and wavelength reuse RSOAs are used to achieve the color-less management of the wavelengths of ONTs. Therefore, problems related to ONT wavelength management can be eliminated by the wavelength reuse RSOAs, and problems related to OLT wavelength management can be eliminated by the seed-light-injection RSOAs.Type: GrantFiled: May 8, 2007Date of Patent: December 27, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Byoung-Whi Kim, Mahn-Yong Park, Seung-Hyun Cho, Woo-Ram Lee
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Patent number: 8054172Abstract: The present invention relates to an apparatus with reconfiguration function and signal gathering function. The apparatus with reconfiguration function and signal gathering function according to the present invention comprises a signal gathering unit which gathers at least one alarm digital alarm signal, an alarm signal address setting unit where the address of the alarm signal gathering unit is setup; and an alarm signal collection controller which outputs the at least one digital alarm signal through serial bus. Therefore, address is allocated to a plurality of digital signals and thus the number of necessary components decreases and the embodiment area decreases, as well.Type: GrantFiled: December 12, 2008Date of Patent: November 8, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Eui Suk Jung, Tae Yeon Kim, Kang Bok Lee, Jea Hoon Yu, Byoung Whi Kim
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Patent number: 8050554Abstract: Provided are a fault localization apparatus based on an optical communication network and a method thereof. In the fault localization apparatus according to the present invention, a downstream light source is used as a monitoring optical signal instead of using an additional monitoring light source and a subcarrier multiplexing (SCM) monitoring pulse signal of a certain frequency band having no interference with a frequency band of a downstream data signal is used and thus a fault position may be detected at low cost.Type: GrantFiled: October 30, 2007Date of Patent: November 1, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Seung-Hyun Jang, Chul-Soo Lee, Eui Suk Jung, Byoung Whi Kim
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Patent number: 8045261Abstract: A Reflective Semiconductor Optical Amplifier (RSOA) for compensating for light loss in an optical link, an RSOA module for improving polarization dependency using the RSOA, and a Passive Optical Network (PON) for increasing economical efficiency and practical use of a bandwidth using the RSOA are provided. The PON includes a central office comprising a plurality of optic sources transmitting a downstream signal and a plurality of first receivers receiving an upstream signal; at least one optical network terminal (ONT) including a second receiver receiving the downstream signal and an RSOA which receives the downstream signal, remodulates the downstream signal into the upstream signal, and transmits the upstream signal in loopback mode; and a remote node interfacing the central office with the ONT. The upstream signal and the downstream signal are transmitted between the remote node and the ONT via a single optical fiber. The remote node includes an optical power splitter at its port connected to the ONT.Type: GrantFiled: May 4, 2010Date of Patent: October 25, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Byoung Whi Kim, Mahn Yong Park, Woo-Ram Lee, Tae Yeon Kim
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Patent number: 8036529Abstract: Provided are a wavelength conversion apparatus in a Time Division Multiplexing Passive Optical Network (TDM-PON) system based on a Wavelength Division Multiplexing (WDM) system, and an optical transmission method using the wavelength conversion apparatus. Each subscriber does not need to have its own wavelength but transmits an uplink signal using a wavelength band used in the TDM-PON system and routs optical network unit (ONU) uplink signals belonging to the same ONU to a wavelength conversion apparatus positioned in a subscriber area. The wavelength conversion apparatus converts the ONU uplink signals into wavelengths and uplinks the wavelengths of an optical line terminal (OLT) of a central office (CO) so as to enable a WDM transmission. Thus, a method of constituting a wavelength conversion apparatus and a remote node (RN) using the wavelength conversion apparatus can be suggested to realize a hybrid-PON system into which TDM-PON system and WDM systems are combined.Type: GrantFiled: October 25, 2007Date of Patent: October 11, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Byoung Whi Kim, Youngil Park
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Publication number: 20110222855Abstract: The present invention proposes a wavelength division multiplexing-passive optical network (WDM-PON) system which transmits downstream data to an optical network unit (ONU) as an optical line termination (OLT) receives seed light from a spectrum-sliced external light source module. One characteristic of the proposed WDM-PON system is that optical transmitters of the OLT and ONU are operated regardless of optical wavelength. Another characteristic of the proposed WDM-PON system is that a conventional TDMA-PON (E-PON or G-PON) ONU can be accommodated without a change.Type: ApplicationFiled: October 16, 2008Publication date: September 15, 2011Inventors: Byoung Whi Kim, Han Hyub Lee, Jie Hyun Lee, Bong Tae Kim