How to extend distance of Serial/Ethernet communication via fiber?

Scenario 1 : Ethernet to Fiber Media Converter (MOXA IMC series, Ethernet Switches with Fiber ports)

Scenario 2 : Serial to Fiber Media Converter (MOXA TCF & ICF Series)

Scenario 3 : Serial to Ethernet Fiber Converter (MOXA NPort IA-5000 series)

Scenario 4 : Serial to Ethernet Fiber Converter (MOXA NPort IA-5150 Series)

Scenario 5 : Modbus Serial to Ethernet Fiber Converter (MOXA MGate MB3170 Series)