Last Updated: July 5, 2022
There are two types of IEC standards for MT/MPO measurements using interferometry.
The first is the “Measurement Standard” and its primary purpose is to try and ensure that different instruments yield the same measurement results. This standard includes information on measurement techniques, measurement parameters, fitting regions, reference points, calculations and in some cases the algorithms used to define each parameter. This is a priority standard and its number is 61300-3-30. The link on the IEC website is https://webstore.iec.ch/publication/5223 . The reality is that this release is dated 2003 and has very little resemblance to the updated document currently making its way through the standards process - and scheduled for publication in 2016 – see images below.
US Conec is a member of the IEC WG4 along with 6 committees and have actively been working on the updated version of this standard for over a decade. Parameters do not exist in the current standards but much will change once the new standard is published this year and many new parameters will be implemented in 61300-3-30. Of course, standards such as 61755-3-31 may lag even further behind 61300-3-30 creating even more confusion.
Below you find some screenshots that share some of the standard work that has been going on.
The second is “Performance or Interface Standards” which relate to specific connector styles or groups. For example, there might be one for MT connectors and another for angled MT connectors. These documents refer to 61300-3-30 as the measurement technique and then continue to elaborate on specific parameters to be measured, ferrule dimensions, tolerances and pass/fail limits. These documents are aimed more towards companies manufacturing, polishing or purchasing connectors.
Although many documents are in development or maintenance, it does not appear that many of them have made it to publication. It is an unfortunate state of affairs that the standards often lag the industry by many years…..
Even though there are many new MT measurement parameters, it is important to note that most are not yet fully implemented for anything beyond single row MT 12 connectors.
Total Coplanarity and Fiber Line were critical building blocks in the process of building the new standard which is scheduled for release this year (2016) and it looks that Coplanarity will be replaced by Minus Coplanarity and Fiber Line will be encompassed in the GL calculation for the new release.
The reason for this parameter “failure” is more related to the interferometer manufacturer using the implementing test parameter ahead of the new standard release.
The current release is from 2003 and lacks behind the industry requirements. Many customers require more up-to-date (higher and better specifications), so it’s been implemented in this software of some suppliers. Ultimately it hasn’t been adopted yet and if you don’t see value in it, you may turn these test parameters off and still might be the standard.
However, if you want to prepare for the future, please review our MT polishing process (bit.ly/1W6R7jH) or feel free to contact us so we can arrange a visit to help evaluate your entire process.
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