Does OpenWrt support the EPON/GPON function?

I actually wanted to discuss the functionality of the PON, not the support for SFP ports, shown on the left side of the figure below.

   -------------------------------------------
  |                                           |
  |                OpneWRT                    |
  |                                           |
   -------------------------------------------
  |  PON MAC    |             |  Ethernet MAC |
   -------------               ---------------
  |    PHY      |             |     PHY       |
   -------------               ---------------
       | S |                         | S |
       | F |                         | F | 
       | P |                         | P |  
       |   |                     ---------------
       |   |                    | Router/Switch | 
       |   |                     ---------------  
   -------------
  |   ISP OLT   |
   -------------

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