Passive Optical Network and Optical Line Terminal
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United States of America Patent
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Issued Date -
Aug 27, 2015
app pub date -
Feb 6, 2015
filing date -
Feb 27, 2014
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Abstract
A passive optical network comprises at least two optical line terminals (OLTs), a remote node (RN), and a plurality of optical node units (ONUs). Each OLT has a WDM working port, the RN has a number M WDM ports and a number N distribution ports, and each ONU has a communication port. Each OLT WDM working port is connected to a dedicated RN WDM port by a respective working feeder fiber, and each ONU communication port is connected to a dedicated RN distribution port by a respective distribution fiber. The RN comprises a passive optical filter device having a spectral and spatial filter property of an M×N arrayed waveguide grating and defining the M WDM ports and the N distribution ports. Each OLT communicates to a respective ONU using optical channel signals at a downstream wavelength defined by the passive optical filter device making up the RN.
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