Keyed SMA fibre optic system from OMC ensures consistent mated performance

Combining features from different connector styles, OMC says its Keyed SMA connector and diode receptacle systems eliminates rotational variation.

The optoelectronics designer and manufacturer has released the Keyed SMA (KSMA) connector and diode receptacle system for its range of fibre optic transmitters and receivers which offers the rotational consistency of a keyed connector alongside the security and reliability for which the SMA connector is renowned.

The KSMA fibre optic connector system combines a new connector and diode housing design, which OMC believes delivers “the best of all worlds”. Unlike the standard SMA connector, which can be inserted at any rotation about the ferrule axis, OMC’s KSMA system incorporates a mechanical keyway mechanism, thus eliminating rotational variation when a cable is mated to the transmitter or receiver. The connector continues to feature the secure hexagonal lock-nut fixing of OMC’s standard SMA connector, ensuring maximum long-term integrity of the connection.

Controlling rotational variation is important because if a cable is disconnected and then reconnected, traditional non-keyed SMA devices can rotate throughout the full 360 degrees. This introduces the possibility of performance variations and limits repeatability, which can be problematic in optically demanding applications. OMC says that the KSMA connector system ensures that the link will always deliver consistent, repeatable performance.

The industrial sector generally finds the SMA (H22) style devices useful because the connector lock-nut, once tightened, ensures that the fibre is firmly secured in place. Other styles, for example sprung devices, can allow the fibre to pull back and change the attenuation of the link if any tension is brought to bear on the cable. The KSMA diode housing also retains another major benefit of OMC’s traditional PCB mount SMA (H22 style) housing, the rugged, all-metal design.

The KSMA connector system suits industrial applications, particularly if cables will be required to be disconnected and reconnected, or if performance criteria are critical to the application. Installation of the KSMA connector is through the use of new, high precision CNC machining capabilities. The keyway mechanism is engineered to couple smoothly and without effort. As with OMC’s standard SMA connector, a small hex spanner is used to gently tighten the lock nut after installation. As well as securing the link, this reduces the likelihood of casual tampering or unintentional demating. OMC’s full range of transmitter (Tx) and receiver (Rx) devices can be incorporated into KSMA housings.


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