The fibre optic modem (or FOM), connects an electronic device such as a computer to some network or the Internet, provides electrical to optical conversion of electronic communication and data signals for transmission using tactical fiber optic cable assemblies.

How Does Fiber Optic Modem Work?

Fiber optic modems receive incoming optical signals over fiber optic cables and convert them back to their original electronic form for full duplex transmission. Together with the tactical fiber optic cables, the FOM supplies a rugged, secure, and simple deployable optical link.

What is the maximum distance that the fiber optic modem can go?

The utmost distance a modem will go is the distinction between receiver sensitivity and transmit power of the fiber optic modem, divided by the transmission loss of the fiber used. For example, a basic single-mode OSD815 video system?¡¥s transmitter power is larger than -10dBm and its receiver sensitivity is better than -29dBm therefore the difference of 19dB at 1310nm allows operation over at least 45km. Note this is very poor design because there is no allowance for any link margin.

What's Fiber Optic Modem Used For?

Fiber optic modems are often used in data communication systems to bridge long distances at high data rates. Fiber optic systems are particularly immune to electromagnetic interference and therefore very suitable for harsh industrial environments. They are able to transmit data at as much as 12 Mbit/s over distances as much as 80 km with respect to the fiber type. They range from simple devices with just a few ports to multiplexers capable of handling large-scale communication networks. For instance, fiber optic cables are utilized by a few networks for that server to building connection, while cat 7 cable is used for the wiring within the building. To transform these two types of cables you need a fiber optic modem.

What Are The Available Types Of Fiber Optic Modem?

Fiber optic modems are the ideal whenever using large amounts of information. Fiber optics allows data to be transferred efficiently. Available in single mode or multimode models, you need to choose the best one for your needs.

E1 fiber optic modem can be used for modulating a framing or non-framing E1 data signal straight into single mode or multimode optical fiber for a transmission via fiber optic cable line. At another end from the optic cable, optical signal is demodulated into a framing or non-framing E1 data signal. E1 interface might be directly associated with the E1 interfaces of image and knowledge terminals or the WAN ports of MUX, switch and router for a dedicated network setup or perhaps a LAN connection.

V35 fiber optic modem converts V 35 electrical signal into optical data stream for transport over single mode or multi-mode fiber optic cables. At the opposite end of the fiber, the optical stream is converted back to electrical signals of the appropriate interface such as G.703 & V.35. The fiber optic modem extends the transmission distance as much as more than 100Km. The frame format of MOD-V.35 is frame / unframed for E1, so it may be used to transmit E1 signal of frame video or unframed video.

RS232 converter, RS485 converter and RS422 converter (RS means "recommended standard") would be the standards introduced by The Electronics Industry Association to ensure compatibility from the data transmission between equipment produced by different manufacturers. RS232 Modem is perfect for single ended data transmission from one transmitter to 1 receiver at relatively slow data rates (as much as 20K bits/second) and short distances. RS232 Ethernet converter is widely used as possible see them in the common desk computer cases. RS422 converter may be the standard for extended data transmission distances and better Baud rates in contrast to RS232. R485 converter standard meets the requirements for a truly multi-point communications network, and also the standard specifies as much as 32 drivers and 32 receivers on a single (2-wire) bus.

Source from Things You Should Know About Fiber Optic Modem

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