IEC 61300-2-40:2000 pdf download.Fibre optic interconnecting devices and passive components一Basic test and measurement procedures
1.1 Scope and object
This part of IEC 61300 describes the test for screening single-mode tuned connectors against tuning errors. It is applicable to single-mode angled connectors which are equipped with a tuning mechanism. The tests ensure that the plugs passing this test have attenuations lower than Amax when they are randomly mated to other connectors of the same type.
1.2 General description
Attenuation is mainly caused by lateral misalignment of the respective fibre cores. The misalignment is related to the lateral offsets of the fibre core centre to the ferrule axis of each connector plug.
In order to tune a connector, the plug shall have a lateral fibre core offset located in a specified adjusting sector. The screen test method described in the subsequent procedure is able to identify 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 IEC 61300. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC 61300 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards.
2.5 Screen plug for tuned connector (SP)
This is an angled polished plug which has a lateral offset of the fibre core eccentrically positioned 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 true position is located at 0,75 um from the ferrule axis, in the direction of the adjusting axis. The fibre core is within 0,3 μm around this true position (see figure 1).
In order to reduce dispersion in attenuation due to the mode field diameter difference the screen plug should use the same fibre type as the plug to be screened.
3 Procedure
Preconditioning procedure:
The alignment and end surfaces of the plug ferrules and the adaptors shall be cleaned before test.' The clean conditions shall be maintained during the test.
The attenuation measurement methods shall comply with IEC 61300-3-4，Insertion method B,and shall be conducted at ambient temperature. No recovery procedures are required.IEC 61300-2-40 pdf download.