It is disclosed a pump energy source (20) for providing pump energy (E_p) to an optical transmission system (100) transmitting an optical signal along an optical fiber, in particular an optical transmission system (100) in which a beam of said pump energy (E_p) is introduced to said optical fiber so that said beam of said pump energy (E_p) copropagates with said optical signal.

 
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> Fiber distribution frame

~ 00316