| 摘要 |
The present invention refers to a method for applying spatial division multiplexing "SDM" on the signals transmitted from an optical line terminal "OLT" (5) to the optical network units "ONUs'" (11) of a passive optical network "PON" (3) through at least one few mode fiber "FMF" (1) linked to a SDM demultiplexer (7) comprising a plurality of outputs associated respectively to a spatial mode, a selected output of the SDM demultiplexer (7) being linked to at least one ONU (11) wherein the method comprises the following steps:
- transmitting configuration signals from ONUS (11) connected to the selected outputs of the SDM demultiplexer (7) toward the OLT (5),
- receiving and detecting the transmitted configuration signals at the OLT (5),
- determining, within the OLT (5), the channel transfer function of the modes associated with the configuration signals received from the ONUs (11),
- computing the inverse of the determined channel transfer function,
- modulating the data optical field using the computed inverse transfer function to produce the optical signals associated with the different modes,
- multiplexing spatially the modulated signals,
- transmitting the multiplexed signals to the at least one FMF (1) toward the ONUs (11). |
