Optical communication systems

Infra-red technology to provide totally secure short-range voice communication systems.

Our infra-red transmissions are practically impossible to detect so Azdec systems are used where security is a primary concern or where radio signals may adversely affect sensitive electronic systems or flammable atmospheres.

Link Microtek purchased Azdec Ltd in 2009 and continues to use Azdec as a brand name. Azdec was founded in 1986 manufacturing infra-red based control systems and developed the first Azdec infra-red voice communication system in 1997.

Today the Azdec team is fully integrated in the Link Microtek company structure and we continue to provide Azdec systems for naval vessels, air traffic control, training and control room applications in the UK and around the world.


System Overview

The Azdec system is a short range digitally encoded infra-red communication system primarily for secure and interference free voice communication although data can also be transferred.

The system allows operators to be fully mobile whilst communicating, with full duplex voice, with each other and/or a central communication system without the use of radio. Single channel, enhanced or multi-channel systems provide coverage from small selective areas such as a ship’s bridge or operations room to complete buildings, ships, vehicles and aircraft. The system allows complete freedom of movement and exceptionally clear digital communication. The low powered infra-red signal poses no ocular or other health hazard.

The envelope of reception is totally predictable and so well contained that signals are impossible to detect when compared with even low powered radio systems. The equipment emits no electrical signals to interfere with sensitive electronic systems, flammable atmospheres or munitions. By return the system is not susceptible to interference so provides clear voice communication in areas of high electrical (or acoustic) noise. Mobile users can be provided with noise attenuating, single sided or ultra lightweight headsets. Systems are supplied for either defence or commercial use.

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Optical Comms


The Azdec system can be installed throughout a ship or submarine or even used underwater.

Typical applications include use on a ship’s bridge, operations room, RAS deck, engineering and machinery spaces. The underwater system provides divers with voice communication. The outdoor variant is perfectly suited for bridge wing or helideck applications. Because there is no risk of inadvertent interaction with detection systems or explosive devices the system can be safely employed on minesweepers or submarine torpedo rooms.

Operators have complete freedom of movement and can speak to each other or link into the ship’s main communications system via a central base station. The system provides exceptionally clear audio as it is completely immune to electromagnetic interference – even severe energy pulses. It is not only secure but provides no conventional means of detection and is impossible to jam by any practical method.

There are no radio-frequency emissions from the system so it will meet TEMPEST requirements and will not cause interference with radio, radar or other electronic equipment. The system can be operated under radio silence or EMCON conditions and can be operated in areas on board ship where even relatively low power radio systems would cause interference or risk of explosion around munitions or fuel.

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