EN 61300-3-39:1997

SLOVENSKI STANDARD
01-maj-1999
Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 3-39: Examinations and measurements - PC
optical connector reference plug selection (IEC 61300-3-39:1997)
Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures -- Part 3-39: Examinations and measurements - PC optical
connector reference plug selection
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Grundlegende Prüf- und
Meßverfahren -- Teil 3-39: Untersuchungen und Messungen - Auswahl von PC optischen
Referenzsteckverbindern
Dispositifs d'interconnexion et composants passifs à fibres optiques - Méthodes
fondamentales d'essais et de mesures -- Partie 3-39: Examens et mesures - Choix d'une
fiche de référence pour connecteur optique PC
Ta slovenski standard je istoveten z: EN 61300-3-39:1997
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME
CEI
INTERNATIONALE
IEC
61300-3-39
INTERNATIONAL
Première édition
STANDARD
First edition
1997-08
Dispositifs d’interconnexion et composants
passifs à fibres optiques –
Méthodes fondamentales d’essais
et de mesures –
Partie 3-39:
Examens et mesures – Choix d’une fiche
de référence pour connecteur optique PC
Fibre optic interconnecting devices and
passive components –
Basic test and measurement procedures –
Part 3-39:
Examinations and measurements –
PC optical connector reference plug selection
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61300-3-39 © IEC:1997 – 3 –
CONTENTS
Page
FOREWORD . 5
Clause
1 General. 7
2 Definitions. 9
3 Reference plug selection. 11
4 Return loss plug measurement against the reference plug . 13
5 Details to be specified. 15
Annex A – Measurement of the return loss in physical contact optical connectors
using a reference plug . 17

61300-3-39 © IEC:1997 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
––––––––
FIBRE OPTIC INTERCONNECTING DEVICES AND
PASSIVE COMPONENTS – BASIC TEST AND
MEASUREMENT PROCEDURES –
Part 3-39: Examinations and measurements –
PC optical connector reference plug selection
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61300-3-39 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/985/FDIS 86B/1021/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.
IEC 61300 consists of the following parts, under the general title Fibre optic interconnecting
devices and passive components – Basic test and measurement procedures:
Part 1: General and guidance
Part 2: Tests
Part 3: Examinations and measurements
Annex A forms an integral part of this standard.

61300-3-39 © IEC:1997 – 7 –
FIBRE OPTIC INTERCONNECTING DEVICES AND
PASSIVE COMPONENTS – BASIC TEST AND
MEASUREMENT PROCEDURES –
Part 3-39: Examinations and measurements –
PC optical connector reference plug selection
1 General
1.1 Scope and object
The object of this part of IEC 61300 is to select Physical Contact (PC) optical connector plugs
to be used as the reference plug in the return loss RL measurement and to define an
acceptance return loss value RL to be used in plug acceptance testing. This procedure is
a
used to guarantee a certain return loss value RL when two plugs are randomly mated together.
1.2 General description
Return loss at mating points of PC optical connectors (not angled) occur due to multiple
reflection at thin damaged layers on the fibre surface due to the polishing process. The
refractive index of the damaged layers are higher than silica fibre. Because of this
consideration, it is possible to derive a simple composition law for predicting the return loss of
a connection formed by mating two plugs and to define a parameter that characterizes the
reflectance behaviour of each single plug.
In testing a plug against a reference one, the measured return loss depends on the
characteristics of the reference plug used. In order to guarantee that two plugs mated together
give a return loss greater than a minimum acceptable value RL , the following steps are
m
necessary:
– select the reference plug with well-defined characteristics;
– set a lower limit, RL , for the return loss of each plug measured against the reference
a
plug.
Due to the fact that the method does not consider the multiple reflection effects, a slight
random error is present, particularly for values greater than 50 dB. This error in some
cases could be over 1 dB and have a Gaussian distribution with standard deviation typically
below 0,5 dB.
1.3 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 61300. At the time of publication, the editions indicated
were valid. All normative documents are subject to revision, and 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. Members of IEC and ISO maintain
registers of currently valid International Standards.

61300-3-39 © IEC:1997 – 9 –
IEC 61300-1:1995, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 1: General and guidance
IEC 61300-3-6:1997, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-6: Examinations and measurements – Return loss
2 Definitions
2.1 Reference plug
A reference plug is defined as any plug in a group of plugs (minimum three) that, mated
together in each possible combination, give results with a specified value of return loss RL
ref
(see 3.2 for an operative method of reference plug selection). The value for RL and the
ref
relevant tolerance range shall be indicated in the detail specification. However, this value has
to be in the value range of the connectors that are measured with this reference.
2.2 Acceptance return loss value RL
a
To ensure that any tested plugs randomly mated give a return loss greater than allowed RL it
m
is necessary to find the limit of the minimum acceptable return loss value RL for the connector
a
set (two plugs mated by an adapter) composed of the reference plug and the plug under test.
This value is related to the RL of the reference
...