Electronics and Telecommunications Research Institute

Byung-Yong Kang

Seung-Hyun Cho

Bong-Tae Kim

Jie-Hyun Lee

Woo-Ram Lee

Byoung-Whi Kim

Geon Jeong

Manyong Park

Chulyoung Kim

Dae-Ung Kim

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.

Apparatus and method for OLT and ONU for wavelength agnostic wavelength-division multiplexed passive optical networks

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Daejeon, South Korea

Byung-Yong Kang