公开(公告)号：US20200186247A1

公开(公告)日：2020-06-11

申请号：US16699964

申请日：2019-12-02

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Hyun Seo KANG ,  Chan Il YEO ,  Young Soon HEO ,  Kye Eun KIM ,  Sung Chang KIM ,  Ji Hyoung RYU ,  Si Woong PARK ,  Keo Sik KIM ,  Gi Hyeon MIN ,  Hyoung Jun PARK ,  Dong Hoon SON ,  Mun Seob LEE

IPC: H04B10/112 ,  H04B10/40

Abstract: A wireless optical communication apparatus for performing bi-directional optical transmission in a free space includes a first optical system configured to transmit data through a downlink scheme and a second optical system configured to receive the data from the first optical system and transmit a control signal to the first optical system through an uplink scheme, wherein each of the first optical system and the second optical system transmits and receives the data and the control signal through a single port.

公开(公告)号：US20190146296A1

公开(公告)日：2019-05-16

申请号：US15918718

申请日：2018-03-12

Applicant: Electronics and Telecommunications Research Institute

Inventor： CHAN IL YEO ,  Dong Hoon SON ,  Hyun Seo KANG ,  Keo-Sik KIM ,  Kyeeun KIM ,  Sung Chang KIM ,  Ji Hyoung RYU ,  Gi Hyeon MIN ,  Si Woong PARK ,  Hyoungjun PARK ,  Dongsoo LEE ,  Young Soon HEO

IPC: G02F1/163 ,  G02F1/133 ,  G02F1/157 ,  G02F1/1335

Abstract: Disclosed is a variable optical attenuator. The variable optical attenuator includes an electrochromic device having a reflective property or a transflective property, a lens configured to convert input light to focused light or collimated light and input the focused light or the collimated light to the electrochromic device, and an outputter configured to output light reflected from the electrochromic device, in which the electrochromic device is configured to attenuate an intensity of the input light by controlling a reflectivity and a transmissivity of the input light based on an element included in the electrochromic device and a voltage to be applied to the electrochromic device.

公开(公告)号：US20190128733A1

公开(公告)日：2019-05-02

申请号：US15870012

申请日：2018-01-12

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hyun Seo KANG ,  Kyeeun KIM ,  Keo-Sik KIM ,  Sung Chang KIM ,  Ji Hyoung RYU ,  Gi Hyeon MIN ,  Si Woong PARK ,  Hyoungjun PARK ,  Dong Hoon SON ,  CHAN IL YEO ,  Dongsoo LEE ,  Young Soon HEO

IPC: G01J3/02

Abstract: Disclosed is a spectroscopic device including a planar lightwave circuit to which light passing through an optical fiber is input, a wavelength divider configured to divide a wavelength of light passing through the planar lightwave circuit, a beam splitter configured to divide a traveling direction of light passing through the wavelength divider into an external sample inlet and an internal sample inlet and adjust power of the divided light, a charge-coupled device (CCD) image sensor configured to covert light transmitted from the internal sample inlet to an electrical signal or convert light reflected by the external sample inlet to an electrical signal, a control and signal processor configured to process the electrical signal to indicate a light intensity based on each wavelength, and an input and output interface configured to perform a spectrum analysis for each wavelength using the processed electrical signal.