IEC 61300-3-45:2011

IEC 61300-3-45 ®
Edition 1.0 2011-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 3-45: Examinations and measurements – Attenuation of random mated
multi-fibre connectors
Dispositifs d'interconnexion et composants passifs à fibres optiques – Méthodes
fondamentales d'essais et de mesures –
Partie 3-45: Examens et mesures – Affaiblissement dû à l'accouplement de
connecteurs quelconques multifibres

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IEC 61300-3-45 ®
Edition 1.0 2011-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 3-45: Examinations and measurements – Attenuation of random mated
multi-fibre connectors
Dispositifs d'interconnexion et composants passifs à fibres optiques – Méthodes
fondamentales d'essais et de mesures –
Partie 3-45: Examens et mesures – Affaiblissement dû à l'accouplement de
connecteurs quelconques multifibres

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX N
ICS 33.180.20 ISBN 978-2-88912-483-1

– 2 – 61300-3-45  IEC:2011
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 5
3 General description . 5
3.1 Test methods . 5
3.2 Precautions . 6
4 Apparatus . 7
4.1 Source (S) . 7
4.2 Launch conditions (E) . 7
4.3 Detector (D). 7
5 Procedure . 8
5.1 Method 1 . 8
5.2 Method 2 . 10
5.3 Analysis of results . 13
6 Details to be specified . 13

Figure 1 – “Reference” cord measurement – Method 1 . 8
Figure 2 – Test cord measurement – Method 1 . 8
Figure 3 – Test matrix and labelling for measuring method 1 (2-fibre connector) . 9
Figure 4 – Test matrix and labelling for measuring method 1 (4-fibre connector) . 10
Figure 5 – Test matrix and labelling for measuring method 1 (8, 10, 12-fibre connector). 10
Figure 6 – “Reference” cord measurement (1) – Method 2 . 11
Figure 7 – Test cord measurement (1) – Method 2 . 11
Figure 8 – “Reference” cord measurement (2) – Method 2 . 12
Figure 9 – Test cord measurement (2) – Method 2 . 12
Figure 10 – Test matrix and labelling for measuring method 2 (2-fibre connector) . 12
Figure 11 – Test matrix and labelling for measuring method 2 (4-fibre connector) . 13
Figure 12 – Test matrix and labelling for measuring method 2 (8, 10, 12-fibre connector) . 13

Table 1 – Sample size for Method 1. 6
Table 2 – Sample size for Method 2. 6

61300-3-45  IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-45: Examinations and measurements –
Attenuation of random mated multi-fibre connectors

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61300-3-45 Ed.1.0 has been prepared by subcommittee 86B: Fibre
optic interconnecting devices and passive components, of IEC technical committee 86: Fibre
optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3177/FDIS 86B/3215/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

– 4 – 61300-3-45  IEC:2011
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The list of all parts of IEC 61300 series, published under the general title, Fibre optic
interconnecting and passive components – Basic test and measurement procedures, can be
found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until the
stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
61300-3-45  IEC:2011 – 5 –
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-45: Examinations and measurements –
Attenuation of random mated multi-fibre connectors

1 Scope
The purpose of this part of IEC 61300 is to describe the procedure required to measure the
statistical distribution and mean attenuation for random mated optical connectors with physical
contact (PC) and angled physical contact (APC) polished 1-row multi-fibre rectangular ferrules
as defined in the IEC 61754 series. This measurement method is applicable to cable
assemblies.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the
referenced document (including any amendments) applies.
IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
IEC 61300-3-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-1: Examinations and measurements – Visual examination
IEC 61300-3-35, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-35: Examinations and measurements – Fibre optic
connector endface visual and automated inspection
IEC 61754 (all parts), Fibre optic connector interfaces
3 General description
3.1 Test methods
Two test methods are described for measuring the attenuation of random mated optical
connectors. Both provide an estimate of the expected average performance that a group of
cable assemblies (including an adaptor, if applicable) selected from a batch will exhibit when
used in an optical system. The cable assemblies, and any adaptors, must be chosen at random
to ensure that the measurements provide a statistically unbiased estimate.
Method 1 describes the procedure using a sample of cable assemblies and adaptors specified
in Table 1. In this case the plugs (with pins) are used as “reference” plugs and the plugs
(without pins) are tested against them sequentially. The results, based on the number of
measurements specified in Table 1, are recorded in the test matrix shown in Figures 3 to 5.
Method 1 is intended to be part of a design approval exercise that may involve one or more
suppliers. Once approval is achieved, Method 2 would be relied on to maintain process control.
However, in the event of a dispute, Method 1 shall act as the reference measurement method.

– 6 – 61300-3-45  IEC:2011
Method 2 describes a procedure for the measurement of a sample of cable assemblies
specified in Table 2.
Three cable assemblies are selected from the sample as “reference” cable assemblies and
pins are fitted. The other test cable assemblies (without pins) are tested against each of the
three “reference cable assemblies” sequentially. This produces the number of measurements
specified in Table 2 and the results are recorded in the test matrix shown in Figures 10 to 12.
It is recognised that the number of measurements required by Method 1 may be excessive for
day-to-day routine checking of either in-house or supplier produced products. In this case, as
indicated above, Method 2 may be an alternative option.
NOTE In this measurement method, the terms “reference” plug or “reference” cord are used to define those
components chosen at random from a batch, against which a number of comparative measurements are made. It is
not intended that the terms should imply specially chosen or manufactured components, such as those used, for
example, in screen testing.
Table 1 – Sample size for Method 1
Connector Sample size
(n-fibre connector)
Cord and adaptors Measurements Fibres
2-fibre connector 15 210 420
4-fibre connector 12 132 528
8-fibre connector 10 90 720
10-fibre connector 10 90 900
12-fibre connector 10 90 1 080

Table 2 – Sample size for Method 2
Sample size
Connector
Cord and adaptors
(n-fibre connector) Measurements Fibres
Total Reference Test :N
2-fibre connector 12 3 9 54 108
4-fibre connector 8 3 5 30 120
8-fibre connector 6 3 3 18 144
10-fibre connector 6 3 3 18 180
12-fibre connector 6 3 3 18 216

3.2 Precautions
The following test requirements shall be met.
a) Precautions shall be taken to ensure that the cladding modes do not affect the
measurement. Cladding modes shall be stripped as a function of the fibre coating.
b) Precautions shall be taken to ensure that the position of the fibres in the test remains fixed
between the measurement of P and P to avoid changes in attenuation due to bending
1 2
losses.
c) The stability performance of the test equipment shall be ≤ 0,05 dB or 10 % of the
attenuation to be measured, whichever is the lower value. The stability shall be maintained
over the measurement time and operational temperature range. The required measurement
resolution shall be 0,01 dB for both multimode and single mode.

61300-3-45  IEC:2011 – 7 –
d) To achieve consistent results, clean and inspect all connectors and adaptors prior to
measurement. Visual examination shall be undertaken in accordance with IEC 61300-3-1
and IEC 61300-3-35.
NOTE A cladding mode stripper usually comprises a material having a refractive index equal to or greater than
that of the fibre cladding.
4 Apparatus
4.1 Source (S)
The source consists of an optical emitter, the means to connect to it and associated drive
electronics. In addition to meeting the stability and power level requirements, the source shall
have the following characteristics:
– Centre wavelength, as detailed in the performance and product standard;
– Spectral width, filtered light emitting diode (LED) ≤ 150 nm full width half maximum
(FWHM);
– Spectral width, laser diode (LD) < 10 nm FWHM.
For multimode fibres, broadband sources such as an LED shall be used.
For single mode fibres either an LED or LD may be used.
NOTE The interference of modes from a coherent source will create speckle patterns in multimode fibres. These
speckle patterns give rise to speckle or modal noise and are observed as power fluctuations, since their
characteristic times are longer than the resolution time of the detector. As a result, it may be impossible to achieve
stable launch conditions using coherent sources for multimode measurements. Consequently, lasers, including
optical time domain reflectometer (OTDR) sources, should be avoided in favour of LEDs or other incoherent
sources for measuring multimode components.
4.2 Launch conditions (E)
The launch condition shall be specified in accordance with IEC 61300-1.
4.3 Detector (D)
The detector consists of an optical detector, the means to connect to it and associated
electronics. The connection to the detector will be an adaptor that accepts a connector plug of
the appropriate design. The detector shall capture all light emitted by the connector plug.
In addition to meeting the stability and resolution requirements, the detector shall have the
following characteristics:
– Linearity of multimode, ≤ ±0,25 dB (over −5 dBm up to −60 dBm);
– Linearity of single mode, ≤ ±0,1 dB (over −5 dBm up to −60 dBm).
NOTE The power meter linearity should be referenced to a power level of −23 dBm at the operational wavelength.
Where the connection to the detector is broken between the measurement of P , the
and P
1 2
measurement repeatability shall be within 0,05 dB or 10 % of the attenuation to be measured,
whichever is the lower value. A large sensitive area detector may be used to achieve this.
The precise characteristics of the detector shall be compatible with the measurement
requirements. The dynamic range of the power meter shall be capable of measuring the power
level exiting from the device under test (DUT) at the wavelength being measured.

– 8 – 61300-3-45  IEC:2011
5 Procedure
5.1 Method 1
a) Randomly select the sample number of cable assemblies specified in Table 1. Sequentially
label the plugs under test as shown in Figures 3 to 5.
b) Randomly select the sample size of adaptors as specified in Table 1. Sequentially label the
adaptors under test as shown in Figures 3 to 5.
c) Set up the measurement system as shown in Figure 1, with cord 1as the “reference” cord
and with plug 1 as the “reference” plug. Measure power P to P for all fibres in the

1-1 1-n
cord.
“Reference” cord
Fan-out cord
Ch 1
D
S E
Plug Plug
1(without pins)
1(with pins)
Ch n
P
1-n
IEC  900/11
Figure 1 – “Reference” cord measurement – Method 1
d) Connect test cord 2 and adaptor 1 to the system and mate plug 1 (with pins) to plug 2
(without pins) as shown in Figure 2. Measure the power P to P for all fibres in the

2-1 2-n
cord.
Adaptor 1 Test cord
“Reference” cord
Ch 1 Fan-out cord
D
E
S
Plug 1 Plug 1 Plug 2 Plug 2
(without pins) (with pins) (without pins) (with pins)
Ch n
P
2-n
IEC  901/11
Figure 2 – Test cord measurement – Method 1
e) Calculate the attenuation of the mated plug pair 1 (with pins) / 2 (without pins) with adaptor
1, using Equation (1):
Attenuation = [-10 log (P /P )] - (A × L) dB (1)
2-i 1-i
Where
i is fibre number of Test cord.
A is fibre attenuation per km;
L is length of fibre in km.
NOTE The product A × L may be ignored for both single mode and multimode [50/125 µm and 62,5/125 µm] where
the cord length is small, i.e. < 10 m.
f) Record the attenuation results for each fibre into an appropriate matrix format.
NOTE An example of record table (for 4 fibre connectors) is shown in Figure 13.
g) Keeping plug 1 (with pins) and adaptor 1 as the “reference” configuration, replace test cord
2 by test cord 3 and mate plug 3 (without pins) with plug 1 (with pins).

61300-3-45  IEC:2011 – 9 –
h) Measure the power P to P and record the attenuation results for each fibre.

3-1 3-n
i) Repeat steps g) and h) until all the plugs (without pins) of the remaining test cable
assemblies have been tested against the “reference” plug 1 (with pins).
j) After step i) has been completed, replace the “reference” plug and adaptor so that plug 2
(with pins) and adaptor 2 are the “reference” configuration.
k) Measure the attenuation for all plugs against “reference” plug 2 (with pins) and adaptor 2.
l) Continue this process until all allocated plugs have been used as “reference” plugs.

Test cord and labelling
“Reference”
Plug (without pins)
Configuration
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Plug 1 (with pins) Adaptor 1
-
Plug 2 (with pins) Adaptor 2
-
Plug 3 (with pins)) Adaptor 3
-
Plug 4 (with pins) Adaptor 4
-
Plug 5 (with pins) Adaptor 5
-
Plug 6 (with pins) Adaptor 6
-
Plug 7 (with pins) Adaptor 7
-
Plug 8 (with pins) Adaptor 8
-
Plug 9 (with pins) Adaptor 9
-
Plug 10 (with pins) Adaptor 10

-
Plug 11 (with pins) Adaptor 11

-
Plug 12 (with pins) Adaptor 12

-
Plug 13 (with pins) Adaptor 13

-
Plug 14 (with pins) Adaptor 14

-
Plug 15 (with pins) Adaptor 15

-
IEC  902/11
Figure 3 – Test matrix and labelling for measuring Method 1 (2-fibre connector)

– 10 – 61300-3-45  IEC:2011
Test cord and labelling
“Reference”
Plug (without pins)
configuration
1 2 3 4 5 6 7 8 9 10 11 12
Plug 1 (with pins) Adaptor 1
-
Plug 2 (with pins) Adaptor 2
-
Plug 3 (with pins) Adaptor 3
-
Plug 4 (with pins) Adaptor 4
-
Plug 5 (with pins) Adaptor 5
-
Plug 6 (with pins) Adaptor 6
-
Plug 7 (with pins) Adaptor 7
-
Plug 8 (with pins) Adaptor 8
-
Plug 9 (with pins) Adaptor 9
-
Plug 10 (with pins) Adaptor 10
-
Plug 11 (with pins) Adaptor 11
-
Plug 12 (with pins) Adaptor 12
-
IEC  903/11
Figure 4 – Test matrix and labelling for measuring Method 1 (4-fibre connector)
Test cord and labelling
“Reference”
Plug (without pins)
configuration
1 2 3 4 5 6 7 8 9 10
Plug 1 (with pins) Adaptor 1
-
Plug 2 (with pins) Adaptor 2
-
Plug 3 (with pins) Adaptor 3
-
Plug 4 (with pins) Adaptor 4
-
Plug 5 (with pins) Adaptor 5
-
Plug 6 (with pins) Adaptor 6
-
Plug 7 (with pins) Adaptor 7
-
Plug 8 (with pins) Adaptor 8
-
Plug 9 (with pins) Adaptor 9
-
Plug 10 (with pins) Adaptor 10
-
IEC  904/11
Figure 5 – Test matrix and labelling for measuring Method 1 (8, 10, 12-fibre connector)
5.2 Method 2
a) Randomly select the sample number of cable assemblies specified in Table 2.
b) Choose three cable assemblies at random and sequentially label the plugs of each cord as
“reference” plugs. Sequentially label the plugs of the remaining cable assemblies as test
plugs. Sequentially label three adaptors 1 to 3 (as shown in Figures 10 to 12).
c) Set up the measurement system as shown in Figure 6, with “reference” cord 1 so that the
plug 1 (with pins) is the “reference” plug. Measure power P to P for all fibres in the

1-1 1-n
cord.
61300-3-45  IEC:2011 – 11 –
“Reference” cord
Fan-out cord
Ch 1
D
S E
Plug 1 Plug 1
(without pins)
(with pins)
Ch n
P
1-n
IEC  905/11
Figure 6 – “Reference” cord measurement (1) – Method 2
d) Connect test cord 2 and adaptor 1 to the measurement system and mate reference plug 1
(with pins) with test plug 2 (without pins) as shown in Figure 7. Measure the power P to

2-1
P .
2-n
Adaptor 1 Test cord
“Reference” cord
Ch 1 Fan-out cord
D
E
S
Plug 1 Plug 1 Plug 2 Plug 2
(without pins) (with pins) (without pins) (with pins)
Ch n
P
2-n
IEC  906/11
Figure 7 – Test cord measurement (1) – Method 2
e) Calculate the attenuation of the mated plug pair 1 (with pins) / 2 (without pins) with adaptor
1, using Equation (2):
Insertion loss = [-10 log (P /P )] - (A × L) dB (2)
2-i 1-i
Where
i is fiber number of Test cord
A is fibre attenuation per km
L is length of fibre in km
NOTE The product A × L may be ignored for both single mode and multimode [50/125 µm and 62.5/125 µm] where
the cord length is small, i.e. < 10 m.
f) Record the attenuation results for each fibre into an appropriate matrix format.
g) Repeat steps d) to f) until all test plugs (without pins) have been tested against “reference”
plug 1 (with pins) and adaptor 1.
h) After step g) has been completed, replace the “reference” plug and adaptor so that
“reference” plug 2 (with pins) and adaptor 2 are the “reference” configuration.
i) Measure the attenuation for all test plugs (without pins) against “reference” plug 2 (with
pins) and adaptor 2, using the procedures described above.
j) Continue this process until all allocated “reference” plugs (with pins) and adaptors have
been used and all test cable assemblies (without pins) have been tested.
k) Set up the measurement system shown in Figure 8, with “reference” cord 1 so that the plug
(without pins) 1 is the “reference” plug, Measure power P to P for all fibres in the cord.

1-1 1-n
– 12 – 61300-3-45  IEC:2011
“Reference” cord
Fan-out cord
Ch 1
D
S E
Plug 1 Plug 1
(with pins)
(without pins)
Ch n
P
1-n
IEC  907/11
Figure 8 – “Reference” cord measurement (2) – Method 2
l) Connect test cord 2 and adaptor 1 to the measurement system and mate “reference” plug 1
(without pins) with test plug 2 (with pins) as shown in Figure 9. Measure the power P to

2-1
P .
2-n
Adaptor 1
Test cord
“Reference” cord
Ch 1 Fan-out cord
D
E
S
Plug 1 Plug 1 Plug 2 Plug 2
(with pins) (without pins) (with pins) (without pins)
Ch n
P
2-n
IEC  908/11
Figure 9 – Test cord measurement (2) – Method 2
m) Calculate the attenuation of the mated plug pair 1 (without pins) / 2 (with pins) with adaptor
1, using the equation given above.
n) Record the attenuation results for each fibre into an appropriate matrix format.
o) Repeat steps l) to n) until all test plugs (with pins) have been tested against the “reference”
plug 1 (without pins) and adaptor 1.
p) After step m) has been completed, replace the “reference” plug and adaptor so that
“reference” plug 2 (without pins) and adaptor 2 are the “reference” configuration.
q) Measure the attenuation for all test plugs (with pins) against “reference” plug 2 (without
pins) and adaptor 2, using the procedures described above.
r) Continue this process until all allocated “reference” plugs (without pins) and adaptors have
been used and all test cable assemblies (with pins) have been tested.
Test cord and labelling
“Reference”
Test plug (without pins)
Configuration (1)
“Reference” Plug Adaptor 1 2 3 4 5 6 7 8 9
Plug 1 (with pins) Adaptor 1
Plug 2 (with pins) Adaptor 2
Plug 3 (with pins) Adaptor 3
Test cord and labelling
“Reference”
Test plug (with pins)
Configuration (2)
“Reference” Plug Adaptor 1 2 3 4 5 6 7 8 9
Plug 1 (without pins) Adaptor 1

Plug 2 (without pins) Adaptor 2

Plug 3 (without pins) Adaptor 3

IEC  909/11
Figure 10 – Test matrix and labelling for measuring Method 2 (2-fibre connector)

61300-3-45  IEC:2011 – 13 –
Test cord and labelling
“Reference”
Test plug (without pins)
Configuration (1)
“Reference” Plug Adaptor 1 2 3 4 5
Plug 1 (with pins) Adaptor 1
Plug 2 (with pins) Adaptor 2
Plug 3 (with pins) Adaptor 3
Test cord and labelling
“Reference”
Test plug (with pins)
Configuration (2)
“Reference” Plug Adaptor 1 2 3 4 5
Plug 1 (without pins) Adaptor 1

Plug 2 (without pins) Adaptor 2

Plug 3 (without pins) Adaptor 3

IEC  910/11
Figure 11 – Test matrix and labelling for measuring Method 2 (4-fibre connector)

Test cord and
“Reference”
labelling
Configuration (1)
Test plug (without pins)
“Reference” Plug Adaptor 1 2 3
Plug 1 (with pins) Adaptor 1
Plug 2 (with pins) Adaptor 2
Plug 3 (with pins) Adaptor 3
Test cord and
“Reference”
labelling
Configuration (2)
Test plug (with pins)
“Reference” Plug Adaptor 1 2 3
Plug 1 (without pins) Adaptor 1

Plug 2 (without pins) Adaptor 2

Plug 3 (without pins) Adaptor 3

IEC  911/11
Figure 12 – Test matrix and labelling for measuring Method 2 (8, 10, 12-fibre connector)
5.3 Analysis of results
The mean value and 97 % percentile values of the measurement data from all the fibres of
either Method 1 or Method 2, shall comply with the values specified in the relevant connector
performance standard.
6 De
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