Electronics and Telecommunications Research Institute

Lg Energy Solution, Ltd.

Yong-Hwan Kwon

Eun Soo Nam

Joong-Seon Choe

Chun Ju Youn

Jong-Hoi Kim

Jae-Sik Sim

Kwang-Seong Choi

Bongki Mheen

Kisoo Kim

Duk Jun Kim

Myoungsook Oh

Dong-Wook Kim

Ju-Nam Son

Seo-Hyeon Chae

Hae Cheon Kim

Hyung Sup Yoon

Jong Min Lee

Ho Kyun Ahn

Jong-Won Lim

Dong Min Kang

Byoung-Gue Min

Sang-Heung Lee

Dong-Young Kim

Dae Kon Oh

Mi-Ran Park

Seong Il Kim

Kyu Jun Cho

Hyun Wook Jung

Jae Won Do

Eun-Soo Nam

Young-Jun Chong

Bong-Ki Mheen

Kyoungwoo Heo

Myungsook Oh

Ki-Jun Sung

A cylindrical battery includes an electrode assembly and a cylindrical battery housing. The electrode assembly includes a core and an outer circumference. The cylindrical battery includes a first fan-shaped region and a second fan-shaped region. The first fan-shaped region is surrounded by a first straight line and a second straight line passing from a center of the core through a core side end of the first and second electrodes, respectively, and the outer circumference is defined as a stress vulnerable region. The second fan-shaped region is surrounded by a third straight line and a fourth straight line passing from the center of the core through an outer circumference side end of the first and second electrodes, respectively, and the outer circumference is defined as a stress amplification region. A battery pack and vehicle including the same are also provided.

Cylindrical battery, battery pack and vehicle

A cylindrical battery includes a battery housing accommodating an electrode assembly having a first electrode, a second electrode, and a separator spirally wound about a central axis in a core of the electrode assembly such that the first and second electrodes each have an inner end and an outer end. A stress vulnerable sector is defined by an arc of an outer circumference of the electrode assembly between a first radius and a second radius extending from the central axis through the inner end of the first electrode and the second electrode, respectively. A stress amplification sector is defined by an arc of the outer circumference between a third radius and a fourth radius extending from the central axis through the outer end of the first electrode and the second electrode, respectively. At least the outer end of the first electrode is not positioned within the stress vulnerable sector.

A high electron mobility transistor includes a substrate including a first surface and a second surface facing each other and having a via hole passing through the first surface and the second surface, an active layer on the first surface, a cap layer on the active layer and including a gate recess region exposing a portion of the active layer, a source electrode and a drain electrode on one of the cap layer and the active layer, an insulating layer on the source electrode and the drain electrode and having on opening corresponding to the gate recess region to expose the gate recess region, a first field electrode on the insulating layer, a gate electrode electrically connected to the first field electrode on the insulating layer, and a second field electrode on the second surface and contacting the active layer through the via hole.

High electron mobility transistor and fabrication method thereof

Disclosed are a method and an apparatus for transmitting and receiving coherent optical OFDM. The apparatus includes: a transmitted OFDM digital signal processing unit outputting an in-phase (I) component digital signal and a quadrature phase (Q) component digital signal; a digital-analog converter converting the in-phase (I)-component digital signal and the quadrature-phase (Q)-component digital signal into an in-phase (I)-component analog signal and a quadrature-phase (Q)-component analog signal, respectively; an adder adding an additional pilot tone signal to each of the in-phase (I)-component analog signal and the quadrature-phase (Q)-component analog signal outputted from the digital-analog converter; and an optical I/Q modulator up-converting the in-phase (I)-component analog signal added with the additional pilot tone signal and the quadrature-phase (Q)-component analog signal added with the additional pilot tone signal to an optical domain to output a coherent optical OFDM signal including the additional pilot tone signal.

Method and apparatus for transmitting and receiving coherent optical OFDM

Disclosed are a laser radar system and a method for acquiring an image of a target, and the laser radar system includes: a beam source to emit the laser beam; a beam deflector disposed between the beam source and the target, and configured to deflect the laser beam emitted from the beam source in a scanning direction of the target as time elapses; and an optical detector configured to detect the laser beam reflected from the target, which is provided a plurality of beam spots having a diameter D; and a receiving optical system disposed between the target and the optical detector and configured to converge the laser beam reflected from the target, and the optical detector includes a detecting area having a diameter Dthat satisfies an equation of &#x221a;{square root over (2)}&#xd7;P+2&#xd7;D&#x2266;D&#x2266;2&#xd7;Dand an equation of (4/&#x3c0;)&#xd7;&#x3bb;&#xd7;F_number&#x3c;D&#x3c;D.

Laser radar system and method for acquiring 3-D image of target

Disclosed is a system of a dynamic range three-dimensional image, including: an optical detector including a gain control terminal capable of controlling an optical amplification gain; a pixel detecting module for detecting a pixel signal for configuring an image by receiving an output of the optical detector; a high dynamic range (HDR) generating module for acquiring a dynamic range image by generating a signal indicating a saturation degree of the pixel signal and combining the pixel signal based on the pixel signal detected by the pixel detecting module; and a gain control signal generating module generating an output signal for supplying required voltage to the gain control terminal of the optical detector based on the magnitude of the signal indicating the saturation degree of the pixel signal.

Dynamic range three-dimensional image system

Provided is an apparatus and method for measuring IQ imbalance, and in particular, is an apparatus and method for measuring IQ imbalance for an optical receiver. The apparatus for measuring IQ imbalance for an optical receiver includes a light generating unit generating optical and reference signals to provide the optical and reference signals to an optical receiver, a graph creating unit creating a Lissajous figure by using an in-phase (I) signal and a quadrature-phase (Q) signal output from the optical receiver in response to the optical and reference signals, and a calculating unit calculating IQ imbalance for the optical receiver with reference to the Lissajous figure.

Apparatus and method for measuring IQ imbalance for optical receiver

Provided is a method of measuring signal transmission time difference of a measuring device. The measuring device according to embodiments, by measuring a skew on two optical paths through signal delays of sufficient sizes for skew measurement on the optical paths, even a skew having a minute size can be measured within a measurable range.

Measuring device and method of measuring signal transmission time difference thereof

An apparatus for measuring performance of a coherent optical receiver includes a beam splitter splitting light into first and second paths, a first optical modulator modulating the first path light, a variable optical attenuator controlling an optical power of the first optical modulator, a first polarization controller transmitting a signal controlling polarization of an output of the variable optical attenuator to the coherent optical receiver, a second optical modulator modulating the second path light, a variable optical delay line delaying time of an output of the second optical modulator, a second polarization controller transmitting a signal controlling polarization of an output of the variable optical delay line to the coherent optical receiver, a network analyzer measuring performance of the coherent optical receiver and controlling the optical modulators, and a controller transmitting a control signal to the optical modulators.

Apparatus for measuring performance of coherent optical receiver

Provided is a photo detector. The photo detector includes: an avalanche photodiode; a bias circuit supplying a bias voltage to one end of the avalanche photodiode; a detection circuit connected to the other end of the avalanche photodiode and detecting a photoelectric current occurring in the avalanche photodiode; and a coupling capacitor connected to the one end or the other end of the avalanche photodiode and supplying a coupling voltage to drive the avalanche photodiode in a Geiger mode.

Photo detector having coupling capacitor

The inventive concept provides avalanche photo diodes and methods of manufacturing the same. The avalanche photo diode may include a substrate, a light absorption layer formed on the substrate, a clad layer formed on the light absorption layer, an active region formed in the clad layer, a guard ring region formed around the active region, and an insulating region formed between the guard ring region and the active region.

Avalanche photo diode and method of manufacturing the same

Provided is a polarization division multiplexed optical OFDM transmitter. The polarization division multiplexed optical OFDM transmitter includes a data demultiplexer, a training symbol generation unit and an optical up-converter and polarization division multiplexing unit. The data demultiplexer divides a transmission signal into a plurality of groups. The training symbol generation unit allocates a plurality of training symbols for each OFDM data which is included in the respective multiplexed groups, and allocates repetitive data in a time domain for the respective training symbols for data of 0 to periodically appear for the respective training symbols in a frequency domain. The optical up-converter and polarization division multiplexing unit performs optical frequency band conversion and polarization division multiplexing on an output of the training symbol generation unit to output a polarization division multiplexed optical OFDM signal corresponding to a plurality of polarization components.

Polarization division multiplexed optical orthogonal frequency division multiplexing transmitter and receiver

Provided is an optical OFDM receiver. The optical OFDM receiver receives an optical signal dependent on the nonlinearity of a transmitter. The optical OFDM receives includes an optical down converter, a nonlinearity compensator, and an OFDM demodulator. The optical down converter converts the optical signal into an electrical signal. The nonlinearity compensator filters the electrical signal, for compensating distortion which is added to the optical signal when the transmitter performs optical modulation. The OFDM demodulator demodulates the distortion-compensated electrical signal in an OFDM scheme.

Optical orthogonal frequency division multiplexing receiver and optical signal receiving method thereof

Provided are an adapter assembly and method for compensating optical fibers for a length difference. The adapter assembly includes a first adapter, a second adapter, and a member. The first adapter is configured to be connected to at least one optical communication unit. The second adapter is configured to be connected to at least another optical communication unit and be coupled to the first adapter. The member is configured to be interposed between the first and second adapters for providing an optical signal transmission path between the optical communication units. Owing to the member, a length difference between optical fibers can be compensated for.

Adapter assembly and method for compensating optical fibers for length difference

Provided are an optical receiver and a method of forming the same. The optical receiver includes a lens, a photo detector, and a hetero-junction bipolar transistor. The lens is attached to a backside of a substrate. The photo detector is disposed on a top surface of the substrate. The hetero-junction bipolar transistor is disposed on the top surface of the substrate. The lens condenses an incident optical signal to transmit the condensed optical signal to the photo detector.

Growing community of inventors

Daejeon, South Korea

Yong-Hwan Kwon