Infra red SMA fibre optic transmitter is efficient for mass transit applications

Able to deliver greater distance and lower power than existing transmitters, the FDE870HE industrial fibre optic transmitter LED can be used in applications as diverse as industrial, mass transit, power distribution and petrochemical equipment.

The FDE870HE can deliver up to four times more launch power into multi-mode fibre for the same current versus existing transmitter devices, says OMC. The transmitter contains a high-performance 870nm chip and micro-optic elements that gather and focus the emitted photons. The result is that is couples “considerably more” light into multi-mode optical fibres and enables data to be transmitted reliably over greater distances, or allows the system to use less power to achieve the same result. The Enhanced day-1 launch power and lower drive current requirements increase long term reliability, adds OMC.

The FDE870HE is optimised for use with small core. Multi-mode glass optical fibres in industrial systems. It can be supplied in a range of housings (including SMA and ST interfaces) with optical performance configured for different fibre core sizes – including 50/125, 62.5/125, 100/140 and 200/230, according to customer requirements.  Into 50 micron fibre, at the nominal 50mA drive current, it achieves a typical coupled power of 60 microW. This compares with around 30 microW at 100mA for existing transmitters currently available, says OMC, adding that this is twice the launch power for half the current, or four times the efficiency.

For other core sizes, launch power at 50mA drive current is around 1050 microW for 200 micron fibre, 260 microW for 100 micron fibre and 110 microW for 62.5 micron fibre. The device’s maximum rise and fall times at 50mA are 10ns, making the FDE870HE suitable for high speed industrial data transmission.

To achieve precise alignment of the emitter with the fibre optic interface when mounting the LED into a fibre-optic housing, OMC uses its proprietary Active Alignment technology, which helps ensure that every fibre optic datalink operates consistently over its, often very extended, lifetime. Not relying solely on the mechanical fit of the LED in the housing for alignment eliminates any variability caused by tolerances in, for example, the position of the LED chip on the leadframe, which can lead to inconsistent results.

Active Alignment techniques involve powering up the transmitter during the manufacturing process and optimising the position of the LED within strictly defined performance window required by each application. OMC also utilises the same process when manufacturing housed receiver devices, leading to a consistent optical link.

The first PCB-mount, housed variant of this transmitter, the H22DBE870HE, is now in full production, and features a precision-machined all-metal housing with SMA interface, locking-nut, and rugged screw-mount mechanical connection to the circuit board.

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