One of the main reasons why clients entrust TXO Optics with provision of optical transceivers is the care and the steps that we take in relation to pre-testing within our own testing lab before making shipment to the client.

Functionality testing whereby the optical parameters of the transceiver are tested is an important part of this. The other key element is compatibility testing, which is documented here.

For this part of the process the transceiver is tested to check that the output power of the laser and the receive sensitivity is as per the specification presented on the data sheet. In order to do this TXO uses instruments such as an optical power meter and variable attenuator. The readings are taken and recoded on a test report that accompanies the shipment of products.

EXFO testing instruments
EXFO testing instruments

TXO Optics is also able to provide more rigorous testing, to meet your exact requirements. Testing procedures are generally devised in consultation with the client in order to produce an agreed protocol. This can include a traffic test using EXFO instruments. Here the full line is tested using two EXFO instruments plus one or more relevant hardware devices and transceivers. This means that TXO Optics can provide test reports to show that the optic has been tested in conjunction with the intended hardware and has passed either a BERT or RFC 2544 test in order to provide assurance in relation to packet loss / bit error rate. For some clients it is necessary to run the test for an extended period e.g. 12 hours or more.

 

Optical transceiver traffic testing procedure
Testing procedure

A variation of this test is to include testing over a suitable length of fibre.  We have 3 x 40km fibre spools available which means that TXO Optics can demonstrate that the transceiver is capable of operating over 40km, 80km or even 120km distances.

In addition, TXO also uses EXFO testing instrument FTB-1V2-PRO with FTB890NGE card. This device is loaded with the iOptics tool which is a self contained specialist optics testing package. Once inserted the transceiver is subjected to a battery of tests looking at optical parameters as well as a BERT test in order to check for any pattern loss. This tool can test SFP, SFP+, QSFP, QSFP28 and CFP4 modules. The tool can output a detailed testing report based on user – defined or autonomously discovered thresholds. Read more information about the iOptics tool here.

 

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