BS/EN 61755-3-32-2016 pdf download.Fibre optic interconnecting devices and passive components Connector optical interfaces Part 3-32: Connector parameters of non-dispersion shifted single mode physically contacting fibres — Angled thermoset epoxy rectangular ferrules.
This part of IEC 61755 defines certain dimensional limits of an angled PC rectangular thermoset (TS) ferrule optical interface in order to meet specific requirements for fibre-to-fibre interconnection. Ferrules made from the material specified in this standard are suitable for use in categories C, U, E, and 0 as defined in IEC 61753-1.
Ferrule interface dimensions and features are contained in the IEC 61754 series, which deals with fibre optic connector interfaces.
2 Normative references
The following documents, In whole or in part, are normatively referenced in this document and are indispensable for Its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60793-2-50. Optical fibres — Part 2-50: Product specifications — Sectional specification for class B single-mode fibres
IEC 6 1300-3-30, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-30: Examinations and measurements — Polish angle and fibre position on single ferrule multifibre connectors
IEC 61 300-3-52, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-52: Examinations and measurements — Guide hole and alignment pin deformation constant, CD for 8 degree angled PC rectangular ferrule, single mode fibres
IEC 61754 (all parts), Fibre optic interconnection devices and passive components — Fibre optic connector interfaces
IEC 61754-5:2005. Fibre optic connector interfaces — Part 5: Type MT connector family
IEC 6 1754-7:2008, Fibre optic interconnecting devices and passive components — Fibre optic connector interfaces — Part 7: Type MPO connector family
IEC 61754-7-1:2014, Fibre optic interconnecting devices and passive components — Fibre optic connector interfaces — Part 7-1: Type MPO connector family — One fibre row
IEC 61755-1, Fibre optic connector optical interfaces — Part 1: Optical interface for single mode non dispersion shifted fibres — General and guidance
Parameters influencing the lateral and angular offset of the optical fibre axes include the following:
— fibre hole deviation from designated location:
— fibre cladding diameter relative to fibre hole clearance:
— fibre hole angular misalignment:
— fibre core concentricity relative to the cladding diameter;
— alignment pin diameter relative to the guide hole clearance.
Parameters influencing the longitudinal offset of the optical fibre axes include the o’Iowing:
— fibre protrusion:
— fibre array minus coplanarity;
— adjacent fibre height differential:
— end face angle in the x-axis;
— end face angle in the y-axis;
— end face radius in the x-axis;
— end face radius in the y-axis;
— fibre tip spherical radii;
— axial force on ferrule end face;
— ferrule and fibre material constants:
— frictional force of alignment pins in ferrule guide holes.
4 Interface parameters
This standard defines the dimensional limits of angled PC rectangular ferrules with a single row of up to 12 fibres. The fibre centres are spaced with a nominal alignment pitch of 0,25 mm. Interface variants, which identify nominal ferrule cross-sections and applicable fibre counts, are given in Table 1. The fibre numbering conventions are illustrated En Figure 1.
Optical interface dimensions related to lateral and angular offset are defined in Figure 2 and the alignment pin geometry Is shown in Figure 3. The end face geometry parameters that influence longitudinal offset are outlined in Figure 4.
The parameter values related to lateral and angular offset are given in Table 2. End face geometry limits associated with longitudinal offset are specified In Table 3.
To establish limits of acceptance on end face geometry, a mathematical system model was developed to estimate the minimum normal force required to achieve physical contact across an array of mated fibres. This model takes into account various factors including:
— fibre tip compression and axial stiffness:
— elastic, foundational deflection of the ferrule structure:
— rotational stiffness of the system:
— frictional resistance between the alignment pins and holes:
— variation in end face geometry dimensions,
For a ferrule with a single row of fibres, there are three dominant end face dimensions that influence the minimum mating force needed to assure physical contact:
— X-slope angle of the end face. SX;
— minus coplanarity of the fibre array, CI:
— Fibre tip spherical radius of curvature, RF.
These parameters were systematically varied to determine their interrelationships with mating force. As a result of the analysis, a geometry limit, GL, can be used to quantitatively assess the acceptability of an end face. This term is a calculated merit function, which relates X-slope angle, coplanarity, and fibre tip radii in comparison to the defined ferrule compression force. For a specific end face condition, lower calculated values for GL Indicate a better geometry. For instance, GL is zero for interfaces with perfectly coplanar fibres and null X-slope angle. A maximum allowable limit can therefore be placed on GL to serve as a bound for unacceptable geometries. BS/EN 61755-3-32-2016 pdf download.
BS/EN 61755-3-32-2016 pdf download
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