Standards Cheat Sheet

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OptoTest Standards Cheat Sheet

Insertion Loss Measurement Procedures

FOTP-171

FOTP-171 was rewritten to include EF for all methods.  It still includes overfilled launch conditions, and the mode filter launch conditions as alternatives.Method A:  Single cable reference.
Method B: Two cable method, with a recommendation to measure multimode cabling in two directions by swapping the ends.
Method C: Replacement method (golden cable) for hybrid cable styles.

IEC 61300-3-4

Insertion Method A:  Splice between loss.  DUT is spliced between a length of fiber for the measurement.
Insertion Method B: Single reference cable method.  DUT connected at end of reference cable for measurement.
Insertion Method C: Two reference cable method.  Two reference cables referenced together and DUT connected between them for measurement.

Equipment Requirements

FOTP-171 Source Requirements:

Nothing specifically stated.  Recommended mandrel sizes:

Table 1 – Mandrel Mode Filter Sizes
Fiber Core Diameter (microns)Mode Filter Diameter (mm)
5025
62.520
10025

Encircled Flux to be added in the future.

FOTP-171 OPM requirements:

Resolution:  0.05dB for loss >5dB, 0.01dB for loss <5dB.

IEC 61300-3-4

Source Requirements.

Table 1 – Preferred source conditions
No.TypeCentral wavelength
nm
Spectral width
nm
Source type
S1Multimode660 ± 30≥30Monochromator or LED
S2Multimode780 ± 30≥30Monochromator or LED
S3Multimode850 ± 30≥30Monochromator or LED
S4Multimode1300 ± 30≥30Monochromator or LED
S5Multimode1310 ± 30To be reportedLaser diode monochromator or LED
S6Multimode1550 ± 30To be reportedLaser diode monochromator or LED
S7Multimode1625 ± 30To be reportedLaser diode monochromator or LED

Stability shall be +/-0.01dB for SM assemblies over the duration of the measurement. For MM assemblies +/-0.02dB.
Source output power needs to be 20dB above the minimum power level.

Source launch conditions:  Encircled flux launch per IEC 61300-1 for
Optical Power Meter Requirements.

NumberTypeMaximum nonlinearity dBRelative uncertainty dB
D1Multimode± 0.05(-60dBm < input power < -5dBm)≤0.05
D2Single Mode± 0.01(attenuation < 10dB)± 0.05(10dB < attenuation < 60dB)≤0.02

NOTE 1: In order to ensure that all light exiting the fibre is detected by the power meter, the sensitive area of the detector and the relative position between it and the fibre should be compatible with the numerical aperture of the fibre.

NOTE 2: Common sources of relative uncertainty are polarization dependence and interference with reflections from the power meter and fibre connector surfaces. The sensitivity of the power meter to such reflections can be characterized by the parameter spectra ripple, determined as the periodic change in responsivity vs. the wavelength of a coherent light source.

Return Loss

IEC 61300-3-6:  Method 2, Return Loss measurement with OTDR.

Connector Loss/Geometry Specifications

FOTP-171

Table A1 – Recommended Multimode Reference Connector Criteria
ParameterSectionReference Criteria
Ferrule outside diameterA.2.1.12.4990 ± 0.0005mm
Connector endface geometry:
Radius of curvature
Apex offset
Fiber height
A.2.1.210 to 25mm
50 microns maximum
± 50nm
Polished ferrule lengthA.2.1.3Per applicable FOCIS document requirement
Reference connector lossA.2.1.4≤ 0.25dB at 850 and 1300nm
Beam exit angleA.2.1.6.5≤ 0.5 degree
Fiber core positionA.2.1.6.4Eccentricity ≤ 3 microns

A.2.2.1 Single Mode
The values in table A2 are recommended for the following Class IV single mode fiber types installed in non-angled physical contact connectors: 9.3/125, 1310/1550nm, 0.13 NA

Table A2 – Recommended Single Mode Reference Connector Criteria
ParameterSectionReference Criteria
Ferrule outside diameterA.2.1.12.4990 ± 0.0005mm
Connector endface geometry:Radius of curvature
Apex offset
Fiber height
A.2.1.2

10 to 25mm
50 microns maximum
± 50nm

Polished ferrule lengthA.2.1.3Per applicable FOCIS document requirement
Reference connector lossA.2.1.4≤ 0.15dB at 1310 and 1550nm
Beam exit angleA.2.1.6.5≤ 0.25 degree
Fiber core positionA.2.1.6.4Eccentricity ≤ 0.25 microns

IEC

Connector Loss Grades
Insertion Loss get grades of A, B, C, etc.

Table 2 – Single Mode attenuation grades at 1310nm and 1550nm (dB)
Attenuation gradeAttenuation (≥ 97%)*MeanNotes
AReserved for future application
B≤ 0.25≤ 0.12
C≤ 0.50≤ 0.25
D≤ 1.0≤ 0.50

* The probability of a random mated connector set of meeting or exceeding the specific level of attenuation will be ≥ 97%. This performance is reached considering a statistical distribution of connector’s parameters (MFD, eccentricity and tilt angle) and using a nominal value for wavelength.

Return Loss get grades of 1, 2, 3, etc.

Table 3 – Single Mode Return Loss grades at 1310nm and 1550nm (dB)
Return Loss gradeReturn Loss (mated)Notes
1≥ 60≥ 55dB in unmated condition (APC only)
2≥ 45
3≥ 35
4≥ 26

Reference Grade Connectors

IEC 61755-2-4, 61755-2-5

Table 1 – Single Mode attenuation grades at 1310nm
Reference grade**
Attenuation** (dB)Contribution to measurement uncertainty*** (dB)
R1≤ 0.1± 0.1
R2≤ 0.2± 0.2

** Under the assumption of worst case alignment with identical connector plug. Expected attenuation measured when connecting two plugs of the same grade may be higher due to significant measurement uncertainty.
*** As described in Clause 8.