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등록 파장 비의존 WDM 수동형 광가입자망를 위한 OLT 및 ONU 장치 및 방법

파장 비의존 WDM 수동형 광가입자망를 위한 OLT 및 ONU 장치 및 방법
이미지 확대
발명자
김병휘, 박만용, 김봉태, 이우람, 김철영, 정건, 이지현, 강병용, 김대웅, 조승현
출원번호
12445935 (2007.07.06)
공개번호
20110026923 (2011.02.03)
등록번호
8644711 (2014.02.04)
출원국
미국
협약과제
07MT2800, 메트로-액세스 전광 통합망 기술개발, 김봉태
초록
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. It is possible to improve the quality and reliability of downstream transmission by sufficiently increasing an extinction ratio, and improve the quality and reliability of upstream transmission by sufficiently flattening an input downstream optical signal in a semiconductor optical amplifier.
KSP 제안 키워드
Light source, Optical amplifier, Optical line terminal(OLT), Optical network, Optical network unit(ONU), Optical signal, Optical transmitters, PON system, Passive optical network, Semiconductor optical amplifiers(SOAs), Upstream transmission, Wavelength Division Multiplexing(WDM), Wavelength-division, Wavelength-division-multiplexing passive optical network(WDM-PON), extinction ratio