A data communications system which provides multiple logical channels on a passive optical network (PON) using subcarrier multiple access (SCMA). The PON includes multiple optical network units (ONU) which each communicate with a head-end over a logical channel. Collisions among upstream transmissions are thereby avoided and high speed Ethernet service over large distances is made possible.

 
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< Dynamic passive optical network (PON) using a distributed optical cross connect and dense wavelength division multiplexing

< Optical fiber communication systems having simultaneous compensation of polarization mode dispersion and chromatic dispersion

> Network controlled fast cell switching

> Method and system for providing failure protection in a ring network that utilizes label switching
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