IEC 61300-2-40:2000 pdf free download – Fibre optic interconnecting devicesand passive components – Basic test and measurement procedures
1.1 Scope and object
This part of lEC 61300 describes the test for screening single-mode tuned connectors againsttuning errors. lt is applicable to single-mode angled connectors which are equipped with atuning mechanism.The tests ensure that the plugs passing this test have attenuations lowerthan Amax when they are randomly mated to other connectors of the same type.
1.2General description
Attenuation is mainly caused by lateral misalignment of the respective fibre cores. Themisalignment is related to the lateral offsets of the fibre core centre to the ferrule axis of eachconnector plug.
In order to tune a connector, the plug shall have a lateral fibre core offset located in a specifiedadjusting sector. The screen test method described in the subsequent procedure is able toidentify plugs having the desired performance.
1.3 Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this part of lEC 61300.For dated references,subsequent amendmentsto,or revisions of，any of these publications do not apply. However，parties to agreementsbased on this part of iEC 61300 are encouraged to investigate the possibility of applying themost recent editions of the normative documents indicated below.For undated references, thelatest edition of the normative document referred to applies.Members of lEC and lSO maintainregisters of currently valid International Standards.
IEC 61300-3-4，Fibre optic interconnecting devices and passive components – Basic test andmeasurement procedures – Part 3-4:Examination and measurements – Attenuation
1.4 Adjusting sector
Each connector based on a “plug/adaptor/plug” structure defines an(Oy) axis around which thetwo plugs are in a symmetrical position.
In every angled connector, the polishing angle (a) is included in the plan (xOz).The adjustingsector is around this (Oy) axis.Only two options are possible.The ‘selected adjusting ‘sectorshall be defined in the relevant connector specification. The preferred orientation of theadjustment sector shall be the direction of the plug key (see figure 2).
2.5Screen plug for tuned connector (SP)
This is an angled polished plug which has a lateral offset of the fibre core eccentricallypositioned at a theoretical true position，with a tolerance from this theoretical true position.This reference plug shall be defined in the relevant connector specification. The preferred trueposition is located at 0,75 um from the ferrule axis, in the direction of the adjusting axis. Thefibre core is within 0,3 um around this true position (see figure 1).
In order to reduce dispersion in attenuation due to the mode field diameter difference thescreen plug should use the same fibre type as the plug to be screened.
2.6Reference adaptor (RA)
The reference adaptor shall be defined in the connector detail or product specification.
3Procedure
Preconditioning procedure:
The alignment and end surfaces of the plug ferrules and the adaptors shall be cleaned beforetest.The clean conditions shall be maintained during the test.
The attenuation measurement methods shall comply with lIEC 61300-3-4,Insertion method B,and shall be conducted at ambient temperature.No recovery procedures are required.
The attenuation limitA-e for screening the plug under test depends on the connectorconstruction.
Measure the attenuation A。 of the plug under test with a reference adaptor (RA) and a screenplug (SP).A。has to be smaller than a specific value Aref.
The relation between the maximum attenuation in random mating Amax that is expected forscreened plugs and Aref shall be defined in the connector detail or product specification. If not,Aref has to be specified in the test procedure.