公开(公告)号：US20190090726A1

公开(公告)日：2019-03-28

申请号：US16041427

申请日：2018-07-20

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

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

IPC: A61B1/00 ,  A61B1/06 ,  A61B1/04

Abstract: Disclosed is an optical device. The optical device includes: a first WDM filter for dividing an optical signal transmitted through and reflected from a measured subject into an optical signal of an infrared band and a first optical signal through wavelength division multiplexing; a first LC tunable wavelength filter disposed at an output end of the first WDM filter, and selectively filtering the optical signal of the infrared band; a second WDM filter for dividing the first optical signal into an optical signal of a first visible light band and a second optical signal through wavelength division multiplexing; and a second LC tunable wavelength filter disposed at an output end of the second WDM filter, and selectively filtering the optical signal of the first visible light band.

公开(公告)号：US20170279527A1

公开(公告)日：2017-09-28

申请号：US15461214

申请日：2017-03-16

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Geun Yong KIM ,  Hark YOO ,  Sung Chang KIM ,  Dongsoo LEE

IPC: H04B10/079 ,  H04B10/27

CPC classification number: H04B10/27 ,  H04B10/0795 ,  H04B10/272 ,  H04J14/0227 ,  H04Q11/0067

Abstract: A method and an apparatus for setting a quiet window in a passive optical network system are provided. A first response time from a time after an optical line terminal (OLT) transmits a serial number request up to a time in which the OLT receives a first response signal to the serial number request is measured, and a second response time up to a time in which the OLT receives a final response signal to the serial number request is measured. In addition, distance information of an optical network unit (ONU) including the first response time and the second response time is acquired.

公开(公告)号：US20180128978A1

公开(公告)日：2018-05-10

申请号：US15804653

申请日：2017-11-06

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Hyun Seo KANG ,  Eun Kyoung JEON ,  Jaisang KOH ,  Keo-Sik KIM ,  Sung Chang KIM ,  Jeong Eun KIM ,  Ji Hyoung RYU ,  Hyoungjun PARK ,  Dong Hoon SON ,  Chan Il YEO ,  Dongsoo LEE ,  Seihyoung LEE ,  Young Soon HEO

IPC: G02B6/12 ,  H04J14/02

CPC classification number: G02B6/12009 ,  G02B27/00 ,  H04J14/0202 ,  H04J14/0215 ,  H04J14/022 ,  H04J14/0256

Abstract: Disclosed is a multi-wavelength transmission apparatus including a wavelength divider to divide an optical signal by wavelength and output wavelength-divided optical signals to different positions, the optical signal being received from an optical circulator, a first cylindrical lens to diverge the wavelength-divided optical signals along an X axis and a Y axis and allow the wavelength-divided optical signals to be promoted in a Z-direction, a second cylindrical lens to diverge optical signals output from the first cylindrical lens along the X axis and the Y axis and allow the output optical signals to be promoted in the Z-direction, and a reflector to reflect optical signals output from the second cylindrical lens toward the second cylindrical lens, the first cylindrical lens being identical in shape to the second cylindrical lens and rotated by 90° in an Y-axial direction based on the second cylindrical lens.