https://www.fiber-mart.com/wdm-networks-pon-fiber-splitters-c-6_652.html

https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=12771

https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=12771&pn=TDE1315HF


FTT handbook str. 143 - ten z roku 2017  
     tady je planární splitter, ukázat 
http://ozeas.sdb.cz/panska/4A/optika/FTTH_Handbook_2017_V8_FINAL.pdf     

Splitting ratios are not typically 1x2 but rather 1x16, 1x32, or 1x64, increasing the splitter
loss. For example, the typical loss of a 1x64 splitter is 18-20 dB.
str.  185