Serial communication on optical fibre cables

There are a number of devices particularly in Plant automation and SCADA that communicate on serial protocols like RS-485/RS-422/RS-232 etc. Typically extending these serial communication signals on shielded cables has distance limitations apart from susceptibility to electromagnetic interference(EMI). To get over this limitation, we can incorporate Serial to Fibre optic converters that accept RS485/422/232 signals and convert them to optical signals for transmission over 2 Kms in the case of Multimode and 20 Kms in the case of Singlemode. The converters are transparent to the software protocols such as MODBUS-RTU, MODBUS-ASCI etc.  Here is a picture of a typical serial to optical converter:8247-Serial-to-FO-Converter

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Single mode to Multimode fiber converters

Have you come across a situation where you are stuck with singlemode cable and multimode converters and you have to establish fast ethernet communication ?

You can’t relay multimode cable or replace the multimode converters supplied with singlemode converters – What do you do ?

Well, you can install singlemode to multimode converters. These are active devices with two SFP slots that take a MM 100FX SFP on  one  and a SM 100FX SFP on the other. Hook up the LIU end with a SM patchcord to the singlemode SFP and the MM SFP to the MM media converter with a Multimode patchcord and power on the converters…Your link should be up and running !!

A smart way to get around cable and converter mismatches. Want to know more about our products and services ? Please visit We are all about passive and active fiber optic products.


Pigtails, Adapters & Patch cords


Pigtails are short pieces of 0.9mm buffered fibre connectorised at one end and the other end free to be spliced with the optical fibre cable. The No. of pigtails is generally equal to no of fibres in the cable unless some fibres in the cable are left unspliced. It is a good practice to splice all the fibres with pigtails and have all fibres ready for use.You will find the pigtails inside the LIU as you can see from the pictures in the attached file.

Adapters aka Mating sleeves aka couplers are mating points of the pigtail and patchcord. The pigtail is plugged into the adapter at the end inside the LIU and the patchcord is plugged into the end outside the LIU.

Patch cords are flexible fibre optic cable assemblies that facilitate connection between the LIU and the active equipment viz. Ethernet switches and media converters. Patch cords can be simplex or duplex. Simplex means one fibre and duplex means two fibres. Generally fibre optic communication is full duplex meaning a dedicated fibre for the transmit signal and a dedicated fibre for the the receive signal. Accordingly the patch cords are more often duplex than simplex particularly for data communications.

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Splice closures

Splice closures (aka Joint closures) are weatherproof enclosures used to splice 2 or more optical fibre cables. They come in either rectangular or cylindrical construction. The splice closures have  2 -4 cable entry ports to bring the the cables in, splice trays for joining the individual fibres of the cables to each other and properly routing the same. Upon splicing the cable entry ports are sealed with heat shrinkable sleeves. There is also a mechanical design which enables re-opening of the closure if required. The closures are made out of light weight plastic. Once properly sealed the closure is water proof and air tight. Hardware used in the closure is rust proof. The closure generally conforms to IP-68 and suitable for underground direct burial, aerial or duct burial applications.

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LIU – Lightguide Interface Unit


The LIU as you can see above is a meeting place for Fiber optic Cable, Fiber optic pigtails, Fiber optic adapters and Fiber optic patchcords.

The  Fiber optic cables are anchored rigidly in the LIU and the fibers spliced to pigtails and plugged into respective adapters. From the picture you will see 12 adapters which means 12 fibers are available for use. Now Fiber optic patchcords can be used to extend these fibers to the fiber optic port of the active device be it switch, media converter or any other product with inbuilt fiber optic ports.

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