IEC TR 62627-08:2016

IEC TR 62627-08 ®
Edition 1.0 2016-01
TECHNICAL
REPORT
colour
inside
Fibre optic interconnecting devices and passive components –
Part 08: Study of optical power blocking measurement methods for adaptors
with an optical power blocking shutter
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IEC TR 62627-08 ®
Edition 1.0 2016-01
TECHNICAL
REPORT
colour
inside
Fibre optic interconnecting devices and passive components –

Part 08: Study of optical power blocking measurement methods for adaptors

with an optical power blocking shutter

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.20 ISBN 978-2-8322-3119-7

– 2 – IEC TR 62627-08:2016 © IEC 2016
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Background to the measurement method of blocking characteristics for adaptors
with an optical power blocking shutter . 7
4.1 Laser safety requirement for optical fibre communication systems . 7
4.2 Required performance of the power blocking shutter . 8
4.3 Standard measurement conditions used to determine laser safety for optical
fibre communication systems . 8
5 Measurement methods used in this Technical Report . 8
5.1 Background. 8
5.2 Test . 8
5.2.1 Measurement set-up . 8
5.2.2 Study of dynamic range . 9
5.2.3 Light source and optical detector . 9
5.2.4 Measurement environment . 10
5.3 Measurement of the maximum emitted optical power . 10
5.4 Measuring system dynamic range . 10
5.5 Measuring the level of optical power blocking . 10
6 Demonstration of measurement . 11
6.1 Common measurement conditions . 11
6.2 Measurement set-up . 11
6.2.1 Method 1 . 11
6.2.2 Method 2 . 13
6.3 Dynamic range . 14
6.3.1 Method 1 . 14
6.3.2 Method 2 . 15
6.3.3 Samples measured . 15
6.4 Measurement results . 15
6.5 Study of the factors affecting measurement uncertainty . 17
7 Summary . 18
Annex A (informative) Observation of emitted light using a visible light source . 19
Annex B (informative) Detailed measured levels of blocking characteristics (Measured
values of light quantity shielded by adaptors with an optical power blocking shutter). 20
Bibliography . 24

Figure 1 – Example of measurement set-up for Method 1 . 9
Figure 2 – Example of measurement set-up for Method 2 . 9
Figure 3 – Measurement set-up, Method 1 . 13
Figure 4 – Measurement set-up, Method 2 . 14
Figure 5 – Comparison between average of optical power blocking and the standard
deviations (Type SC, wavelength of 1 310 nm) . 16

Figure 6 – Comparison between average of optical power blocking and the standard
deviations (Type SC, wavelength of 1 550 nm) . 16
Figure 7 – Comparison between average of optical power blocking and the standard
deviations (Type LC, wavelength of 1 310 nm) . 17
Figure 8 – Comparison between average of optical power blocking and the standard
deviations (Type LC, wavelength of 1 550 nm) . 17
Figure A.1 – Example of off-axis emitted visible light (Type LC duplex adaptor with an
optical power blocking shutter) . 19

Table 1 – Common measurement conditions . 11
Table 2 – Details of apparatus used for Method 1 . 12
Table 3 – Details of apparatus used for Method 2 . 14
Table 4 – Adaptors with an optical power blocking shutter . 15
Table B.1 – Measured values of optical power blocking (Type SC, measured
wavelength of 1 310 nm) . 20
Table B.2 – Measured values of optical power blocking (Type SC, measured
wavelength of 1 550 nm) . 21
Table B.3 – Measured values of optical power blocking (Type LC, measured
wavelength of 1 310 nm) for non-angled PC end face . 21
Table B.4 – Measured values of optical power blocking (Type LC, measured
wavelength of 1 310 nm) for 8 degree-angled PC end face . 22
Table B.5 – Measured values of optical power blocking (Type LC, measured
wavelength of 1 550 nm) for non-angled PC end face . 22
Table B.6 – Measured values of optical power blocking (Type LC, measured
wavelength of 1 550 nm) for 8 degree-angled PC end face . 23

– 4 – IEC TR 62627-08:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –

Part 08: Study of optical power blocking measurement
methods for adaptors with an optical power blocking shutter

FOREWORD
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example "state of the art".
IEC TR 62627-08, which is a Technical Report, has been prepared by subcommittee 86B:
Fibre optic interconnecting devices and passive components, of IEC technical committee 86:
Fibre optics.
The text of this Technical Report is based on the following documents:
Enquiry draft Report on voting
86B/3931/DTR 86B/3945/RVC
Full information on the voting for the approval of this Technical Report can be found in the
report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 62627 series, published under the general title Fibre optic
interconnecting devices and passive components, 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 website 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.
A bilingual version of this publication may be issued at a later date.

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– 6 – IEC TR 62627-08:2016 © IEC 2016
INTRODUCTION
In recent years, optical communication networks have made greater use of optical fibre
amplifiers and distributed Raman amplifiers. Optical communication equipment usually has an
adaptor on the front of the board as an optical input/output terminal. These adaptors
sometimes emit 100 mW or higher optical power. For the purpose of blocking such optical
power, an adaptor with an optical power blocking shutter is sometimes used.
This Technical Report details the proposed methods to evaluate the efficacy of these adaptor
shutters.
This Technical Report is based on Optoelectronic Industry and Technology Development
Association (OITDA) – Technical Paper (TP), TP19/CN-2014, Investigation of examinations
and measurements – Light-blocking performance of optical adaptor with shutter.

FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –

Part 08: Study of optical power blocking measurement
methods for adaptors with an optical power blocking shutter

1 Scope
This part of IEC 62627, which is a Technical Report, describes two methods used to measure
the blocking characteristics of adaptors with an optical power blocking shutter. This document
focuses on singlemode fibre (SMF) and two wavelengths, 1 310 nm and 1 550 nm.
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.
Void.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
adaptor with an optical power blocking shutter
adaptor defined in IEC 61274-1 that has a shutter to block optical power emitted from its
aperture
Note 1 to entry: An adaptor with a shutter may have a structure such that the shutter automatically moves to block
the aperture when the outer plug is removed. There are two commercially available types of optical adaptors with
shutters: one type blocks optical power and the other type blocks dust ingress. Products that focus on optical
power blocking may have a metal shutter.
3.2
optical power blocking
attenuation a calculated by measuring the maximum emitted optical power when the shutter
b
is fully open (or the shutter is removed) (P ) and the maximum emitted optical power when
0max
the shutter is closed (P )
1max
 P 
1max
 
a = −10 log (dB) (1)
b 10
 
P
0max
 
4 Background to the measurement method of blocking characteristics for
adaptors with an optical power blocking shutter
4.1 Laser safety requirement for optical fibre communication systems
The safety of laser products are defined in IEC 60825-1 which prescribes the acceptable
optical power as the laser safety class. IEC 60825-2, a subdivision standard, provides the
safety standards for optical fibre communication systems. Optical communication equipment

– 8 – IEC TR 62627-08:2016 © IEC 2016
manufacturers sometimes use an adaptor with an optical power blocking shutter to comply
with these laser safety standards.
4.2 Required performance of the power blocking shutter
IEC 60825-2, hazard level 3B, limits optical power at 1 550 nm to 500 mW. However, hazard
level 1, the optical power allowed to be seen by the naked eye or with a magnifying scope, is
limited to 10,2 mW. If equipment manufacturers ensure laser safety only by using an adaptor
with an optical power blocking shutter, the required level of optical power blocking for the
shutter is 17 dB, i.e. the ratio of 500 mW to 10,2 mW.
4.3 Standard measurement conditions used to determine laser safety for optical fibre
communication systems
IEC 60825-2 defines the measurement conditions used to determine the hazard level of
optical fibre communication systems. For wavelengths greater than 1 400 nm, an aperture
diameter of 7 mm is used at a measurement distance of 28 mm from the radiating end of the
optical fibre. For wavelengths less than or equal to 1 400 nm, the aperture diameter is also
7 mm, but the measurement distance is 70 mm from the radiating end of the optical fibre.
5 Measurement methods used in this Technical Report
5.1 Background
The following two methods have been studied.
Method 1: measuring with an aperture diameter of 7 mm, an integrating sphere and an optical
detector.
Method 2: measuring with an optical detector only, having an aperture diameter of less than
7 mm.
In this Technical Report only the 1 310 nm and 1 550 nm wavelengths have been focused
upon as these are the ones most commonly used for optical fibre communication systems.
5.2 Test
5.2.1 Measurement set-up
The measurement set-up for Method 1 and Method 2 is as follows.
a) Method 1
Figure 1 shows an example of measurement set-up for Method 1. Light emitted from an
adaptor with an optical power blocking shutter arrives at the aperture plate, diameter d, in
front of the integrating sphere, and passes through into the integrating sphere. Distance, l,
and aperture diameter, d, are as follows:
– distance, l: 70 mm (at the wavelength of 1 310 nm);
28 mm (at the wavelength of 1 550 nm);
– aperture diameter, d: 7mm.
Adaptor with an optical
power blocking shutter
Aperture plate
Integrating sphere
Optical connector plug
Optical detector
Direction y
Light
source
Direction x l
Optical fibre cord
Optical power
meter
IEC
Figure 1 – Example of measurement set-up for Method 1
b) Method 2
Figure 2 shows an example of the measurement set-up for Method 2. Light emitted from
the adaptor with an optical power blocking shutter arrives at the aperture plate attached
directly to the optical detector. The size of the aperture diameter is different for each of
the two chosen wavelengths, and in each case is calculated in order to maintain the same
ratio of distance l to the aperture diameter d as is used in Method 1.
Adaptor with an optical
power blocking shutter
Aperture plate
Optical connector plug
Direction y
Light
source
Direction x
l
Optical detector
Optical fibre cord
Optical power
meter
IEC
Figure 2 – Example of measurement set-up for Method 2
5.2.2 Study of dynamic range
The optical power of the light source, the sensitivity of the optical detector and any
background noise should all be taken into account to achieve an adequate dynamic range for
the measurement of optical power blocking greater than 17 dB with a small measurement
uncertainty. A dynamic range greater than 30 dB is therefore recommended.
5.2.3 Light source and optical detector
In the case of Method 1, a t
...