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Apparatus and method for olt and onu for wavelength agnostic wavelength-division multiplexed passive optical networks

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.
Owner:ELECTRONICS & TELECOMM RES INST

Fiber reinforced polymer composite bridge deck of tubular profile having vertical snap-fit connection

A fiber reinforced polymer composite deck module is used to form a deck constructed by assembling the deck modules. The deck module comprising an upper plate having an upper extension at its one side, a lower plate having a lower extension at its one side opposite to the side of the upper plate, and an interlink plate therebetween, forming therein a plurality of divisional portions of polygonal tubular cross-sectional shape, wherein at one side, including a first interlocking piece protruded downward at the end of the extension of the upper plate and a second interlocking piece protruded downward at a lower outer surface of the interlink plate, and at the other side, including a third interlocking piece protruded upward at an upper outer surface of the interlink plate and a fourth interlocking piece protruded upward at the end of the extension of the lower plate, wherein upon assembling the deck modules with each other, the first and second interlocking pieces of one module are detachably and mechanically snap-fit coupled to the third and fourth interlocking pieces, respectively, of the other module, and wherein the interlocking pieces coupled to each other have protrusions with a shape corresponding to each other for mutual mechanical engagement so that neighboring deck modules are detachably and mechanically snap-fit coupled in a vertical direction to each other to form a deck.
Owner:LEE SUNG WOO
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