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Optical line terminal arrangement, apparatus and methods

  • US 9,014,562 B2
  • Filed: 03/05/2008
  • Issued: 04/21/2015
  • Est. Priority Date: 12/14/1998
  • Status: Expired due to Fees
First Claim
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1. A wavelength division multiplexed (WDM) optical communication system comprising:

  • a first optical line terminal having an input line-side interface adapted to receive a WDM optical communication signal communicated to the system across an optical fiber, a first transponder, an optical splitter coupled to the first transponder, a first all-optical pass-through interface, and a second all-optical pass-through interface;

    a second optical line terminal having an output line-side interface adapted to transmit a WDM optical communication signal from the system across an optical fiber, an optical switch that can be used to select a wavelength to couple to said output line-side interface, and a first all-optical pass-through interface; and

    a third optical line terminal having an output line-side interface adapted to transmit a WDM optical communication signal from the system across an optical fiber, and a first all-optical pass-through interface;

    the first all-optical pass-through interface of said first optical line terminal being connected to the first all-optical pass-through interface of said second optical line terminal to couple a first wavelength from the input line-side interface of said first optical line terminal through said splitter to said first transponder and, if said switch selects said wavelength, through said splitter and said switch to the output line-side interface of said second optical line terminal,the second all-optical pass-through interface of said first optical line terminal being connected to the first all-optical pass-through interface of said third optical line terminal to couple a second wavelength from the input line-side interface of said first optical line terminal to the output line-side interface of said third optical line terminal,said second optical line terminal further comprising a second transponder, wherein said switch couples a wavelength from said second transponder to the output line-side interface of said second optical line terminal through said switch if said switch alternatively selects said wavelength.

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