Electronics and Telecommunications Research Institute

Intellectual Discovery Co., Ltd.

Jai Sang Koh

Hyun Seo Kang

Mun Seob Lee

Byung-Tak Lee

Byung Tak Lee

Young Sun Kim

Sung Chang Kim

Hark Yoo

Geun Yong Kim

Dong Soo Lee

Young Soon Heo

Jeong Eun Kim

Jong Deog Kim

Hyoung Jun Park

Kwon-Seob Lim

Ji Hyoung Ryu

Keo Sik Kim

Eun Kyoung Jeon

Kwon Seob Lim

Young Suk Lee

Ilkyun Park

Jong Jin Lee

Seihyoung Lee

Nac Woo Kim

Hong Yeon Yu

Dae Won Choi

Hyoung Bok Lee

Sangkyune Kim

Byongkwon Moon

Kyunghun Kim

Nao Woo Kim

Seokkap Ko

Jeong Wook Won

Moon Seob Lee

Moon Seop Lee

Il Kyun Park

Disclosed herein are an astral lamp device having detachable and angle-controllable LED module blocks and a method of setting the same. The astral lamp device having detachable and angle-controllable LED module blocks, includes a plurality of LED module blocks having one end attached to and disposed on a central frame; and an angle control part configured to control an angle of the LED module block attached to the central frame.

Astral lamp device having detachable and angle-controllable LED module blocks and method of setting the same

Provided herein is an optical module including: an optical receptacle including a first lens and a second lens; a lens module including a lens unit facing the second lens of the optical receptacle; and an optical element configured to receive a beam emitted from the lens module or form a beam to be emitted to the lens module. A horizontal length and a vertical length of a cross-section of the first lens may differ from each other, and a horizontal length and a vertical length of a cross-section of the second lens may differ from each other.

Wavelength division multi-channel optical module and manufacturing method thereof

Provided is an optical line terminator (OLT) to recover packet data and a clock from an optical signal including a silent interval. The OLT may receive packet data and a clock from at least one optical network unit (ONU). Even in a silent interval in which the at least one ONU does not transmit packet data, the OLT may successfully recover the clock.

Method and apparatus for burst mode clock and data recovery

Provided are a channel server, a channel prediction server, a terminal, and a method for a fast channel switching. The channel server may generate at least one delay multicast stream from an original multicast stream by applying a different delay value based on channel preference information, and may determine an optimal multicast stream from the at least one delay multicast stream, and transmit, to a terminal, response information associated with the optimal multicast stream in response to query information associated with the original multicast stream received from the terminal.

Channel server, channel prediction server, terminal, and method for fast channel switching using plurality of multicasts interoperating with program rating prediction

Disclosed is a broadcast advertisement service system based on media ID matching, including: a broadcast-contents receiving terminal for receiving broadcast contents from a broadcasting system for a TV broadcaster and displaying the broadcast contents; a server for an AR advertisement broadcaster for receiving the broadcast contents from the broadcasting system for the TV broadcaster, generating a first media ID lookup table from the broadcast contents, and searching for AR advertisement data linked with on-air broadcast contents by referring to the first media ID lookup table; and a user terminal for acquiring the on-air broadcast contents in real time from the broadcast-contents receiving terminal, generating a second media ID lookup table from the acquired on-air broadcast contents, receiving the AR advertisement data linked with the on-air broadcast contents from the server for the AR advertisement broadcaster, and mixing and displaying the acquired on-air broadcast contents and the received AR advertisement data in real time.

Broadcast augmented reality advertisement service system and method based on media ID matching

The present inventive concept herein relates to multi-channel optical modules, and more particularly, to a multi-channel optical module capable of processing a plurality of signals having different optical wavelengths. The multi-channel optical module may include a stem including one or more cavities; at least one lead pin formed in one or more cavities; a plurality of optical devices formed in the one or more cavities; and a filter portion forming an optical path between the plurality of optical devices and an optical fiber by separating a plurality of optical signals according to a wavelength. According to the inventive concept, processing capacity of the optical module may be improved. Also, according to the inventive concept, electrical and optical cross talk of the optical module may be reduced.

Multi-channel optical module

A method of transmitting an Operations, Administration and Maintenance (OAM) message and of processing an error in a Passive Optical Network (PON) system is provided. Using an OAM packet format that may be used in common in the PON system, a process of transmitting or receiving an OAM message may be simplified, an efficiency of the process may be increased, and an Optical Network Unit (ONU) may be managed at a high speed.

Method for transmitting OAM message and processing error in PON system

An optical communication module which uses a single optical fiber to enable bidirectional communication or multiplexing communication is provided. The optical communication module includes a platform configured to have a through-hole therein which vertically passes through the platform; an optical receiver configured to be provided on the platform and include a light-receiving element; an optical transmitter configured to be provided on the platform and include a light-emitting element; and an optical filter configured to be provided on one surface of the platform to correspond to the through-hole, transmit light from the light-emitting element to an optical line, and transmit light input through the optical line to the light-receiving element, where one of the light-receiving element and the light-emitting element is provided on one surface of the platform on an opposite side of the optical line with the optical filter interposed therebetween, and the other is provided on the other surface of the platform to correspond to the through-hole. Accordingly, it is possible to reduce the manufacturing cost, minimize the optical or electrical crosstalk, and maximize the optical coupling efficiency.

Optical communication module

Disclosed is a multicast controlling apparatus and method in a multi hop network. The multicast controlling apparatus in the multi hop network includes a packet determining unit to receive a packet from a group management query device or a station, and to determine whether the received packet is a group management protocol packet, a packet type distinguishing unit to distinguish a type of the received packet when the received packet is determined as the group management protocol packet, and a packet transmitting unit to transmit the packet to a second port excluding a first port that receives the query message, when the received packet is determined as the query message.

Apparatus and method for controlling multicast in multi hop networks

A wavelength division multiplexing passive optical network system is provided. A central office generates a multi-mode light having a mode interval equal to a period interval of a multiplexing filter of the remote node and the multi-mode light is used to control a wavelength of an uplink transmission optical signal of the optical network unit. A remote node multiplexes the multi-mode light with the multiplexing filter to transmit the multiplexed multi-mode light to the optical network unit and demultiplexes the uplink transmission optical signal to transmit the demultiplexed uplink transmission optical signal to the central office. An the optical network unit generates the uplink transmission optical signal by modulating a data signal with a Fabry-Perot laser which uses the multiplexed multi-mode light as an injection optical source. Accordingly, it is possible to control a wavelength of a transmitter of the optical network unit by using the injection optical source generated by the central office.

Wavelength division multiplexing passive optical network system and method of generating optical source

Provided are a passive optical network system and a method of transmitting a broadcasting signal in the same system. A central office (CO) generates a broadcasting signal and a downstream optical data signal using a coding method guaranteeing a run-length, multiplexes the downstream optical data signal and the broadcasting signal, and transmits the multiplexed downstream optical data signal and broadcasting signal. A remote node (RN) transmits the multiplexed downstream optical data signal and broadcasting signal received from the CO to one or more optical network units (ONUs). A gain medium, which is located on a transmission line between the CO and the RN, amplifies the broadcasting signal using the downstream optical data signal as a pump light source. Accordingly, a high gain can be obtained by amplifying the broadcasting signal using the gain medium located on the transmission line without a separate pump light source.

Passive optical network system and method of transmitting broadcasting signal in same

An apparatus for remotely determining a fault of subscriber terminals and a method thereof, and more specifically, an apparatus by which in a passive optical network (PON) system, a central office determines a remote fault of subscriber terminals, and a method thereof are provided. The apparatus for determining a remote fault of subscriber terminals includes: a frequency analysis unit recognizing a fault occurrence of a subscriber terminal from an upstream signal and analyzing the frequency spectrum of the upstream signal; and a fault determination unit selecting a specific frequency corresponding to the shape of the spectrum, determining a diagnosis signal corresponding to the specific frequency, transmitting a message requesting to upward transmit the diagnosis signal to each ONT, finding a peak frequency from the frequency spectrum of the diagnosis signal transmitted by the ONT, determining a fault of the subscriber terminal by comparing the peak frequency with the selected specific frequency.

Apparatus for remotely determining fault of subscriber terminals and method thereof

A system and a method for drawing a patent map using a technical field word are disclosed. In the system and the method, a word to be used for drawing a patent map is extracted by calculating weight values of significant words which are gotten by removing unnecessary words from patent data, and this extracted word is matched with a patent to draw the patent map.

Growing community of inventors

Gwangju, South Korea

Jai Sang Koh