The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 2014
Filed:
Jul. 06, 2007
Byoung-whi Kim, Daejeon, KR;
Manyong Park, Seoul, KR;
Woo-ram Lee, Daejeon, KR;
Bong-tae Kim, Daejeon, KR;
Seung-hyun Cho, Daejeon, KR;
Jie-hyun Lee, Daejeon, KR;
Geon Jeong, Daejeon, KR;
Chulyoung Kim, Gwangju, KR;
Dae-ung Kim, Daejeon, KR;
Byung-yong Kang, Daejeon, KR;
Byoung-Whi Kim, Daejeon, KR;
Manyong Park, Seoul, KR;
Woo-Ram Lee, Daejeon, KR;
Bong-Tae Kim, Daejeon, KR;
Seung-Hyun Cho, Daejeon, KR;
Jie-Hyun Lee, Daejeon, KR;
Geon Jeong, Daejeon, KR;
Chulyoung Kim, Gwangju, KR;
Dae-Ung Kim, Daejeon, KR;
Byung-Yong Kang, Daejeon, KR;
Abstract
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.