WDM type passive optical network

Details WDM type passive optical network WDM type passive optical network

2008-11-25

2010-06-15

Li, Shi K (Department: 2613)

Optical communications

Multiplex

Broadcast and distribution system

C398S072000

Reexamination Certificate

active

07738790

ABSTRACT:
In a WDM type PON system, each ONU comprises an optical transmitter capable to transmit optical signals with variable wavelengths, an optical signal receiving filter variable its receiving wavelength, and a control unit. An OLT selects in response to a wavelength allocation request from each ONU, a transmitting wavelength and a receiving wavelength out of currently free wavelengths and allocates these wavelengths to the requester ONT. The control unit of the ONU switches the transmitting wavelength of the optical transmitter and the receiving wavelength of the optical signal receiving filter to the wavelengths specified in a response message from the OLT and starts data communication.

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United States Office Action issued in U.S. Appl. No. 12/323,059 dated Aug. 7, 2009.

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