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i have two modems, each modem Tx signal is converted to fiber optics.

can I combine the two Tx signals (signal A and signal B) with an optical coupler?
At each time data is transmitted by only on one of the modem Tx so that when :

A transmitting data and B doesn't transmit anything at the output of the coupler I'll receive A? and vice versa.

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  • \$\begingroup\$ Yes, it should be possible as per What's answer below. You are running in half-duplex mode (only one end transmitting at a time). Just make sure that there is no handshaking (XON / XOFF, for instance) going on in the background. \$\endgroup\$
    – Transistor
    Commented Dec 27, 2015 at 17:15

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Absolutely, but I suggest you do a bit of really elementary Googling before you ask this sort of question. Using "fiber optic splitter" or "fiber optic coupler will get you lots candidates. Newport, for instance has just what you need.

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  • \$\begingroup\$ And other sources have them for a LOT less money (I lost a lot of respect for newport (I used a lot of their hardware on optical tables decades ago) when I had to build a communications fiber optics system on a budget - and also when I read their truly out of touch advice to soak connectors in isopropyl before use. FIS (only a mostly happy customer) has these for less than half the lowest priced newport version. fiberinstrumentsales.com/assemblies/… \$\endgroup\$
    – Ecnerwal
    Commented Dec 28, 2015 at 2:04
  • \$\begingroup\$ Wont the laser of B will increase the noise levels when modem A is working? \$\endgroup\$
    – Alex V.
    Commented Dec 28, 2015 at 10:00

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