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Registered Apparatus and Method for OLT and ONU for wavelength agnostic Wavelength-division multiplexed passive optical networks
이미지 확대
Apparatus and Method for OLT and ONU for wavelength agnostic Wavelength-division multiplexed passive optical networks
- Inventors
- Kim Byoung Whi, Park Manyong, Kim Bong Tae, Lee Woo-Ram, Kim Chulyoung, Jeong Geon, Jie Hyun Lee, Kim Dae Ung, Kang Byung Yong, Cho-Seung-Hyun
- Application No.
- 12445935 (2007.07.06)
- Publication No.
- 20110026923 (2011.02.03)
- Registration No.
- 8644711 (2014.02.04)
- Country
- UNITED STATES
- Project Code
- 07MT2800, Metro-Access Integrated Optical Network Technology, Kim Bong Tae
- 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.
- KSP Keywords
- Light sources, 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