IEC TR 62150-7:2024

Fibre optic active components and devices – Test and measurement procedures – Part 7: Calculation methodology of laser safety class for optical transceivers and transmitters

IEC TR 62150-7: 2024 which is a technical report, provides simple calculation guidelines for the laser safety class of optical transceivers and transmitters, whose baseline standard is IEC 60825-1. The calculation methodology for Class 1 and Class 1M safety levels is the main scope of this document, because most of optical transceivers and transmitters are specified for these classifications. The calculations and classifications in this document follow IEC 60825-1, which specifically advises that laser safety classifications be based on tests that consider any reasonably foreseeable single-fault condition in the application of a transceiver or transmitter. More information can be found in IEC 60825-1:2014, 5.1.

General Information

• Status: Published
• Publication Date: 16-Sep-2024
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86C - Fibre optic systems and active devices
• Current Stage: PPUB - Publication issued
• Start Date: 04-Oct-2024
• Completion Date: 17-Sep-2024

Standards Content (Sample)

IEC TR 62150-7 ®
Edition 1.0 2024-09
TECHNICAL
REPORT
colour
inside
Fibre optic active components and devices – Test and measurement procedures –
Part 7: Calculation methodology of laser safety class for optical transceivers and
transmitters
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IEC TR 62150-7 ®
Edition 1.0 2024-09
TECHNICAL
REPORT
colour
inside
Fibre optic active components and devices – Test and measurement procedures –

Part 7: Calculation methodology of laser safety class for optical transceivers

and transmitters
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.20  ISBN 978-2-8322-9657-8

– 2 – IEC TR 62150-7:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Calculation methodology. 7
4.1 General . 7
4.2 Wavelength . 8
4.3 Time base . 8
4.4 Hazard for eye and skin . 8
4.5 Class categories . 9
4.6 Measurement conditions 1, 2, and 3 . 9
4.7 Correction factors . 12
4.8 Class 1 and Class 1M power calculations . 13
5 Example of calculations . 14
5.1 Class 1 power for MMF applications between 700 nm and 1 050 nm
wavelength . 14
5.2 Class 1 power for SMF applications between 1 200 nm and 1 400 nm
wavelength . 15
5.3 Class 1 power for SMF applications between 1 400 nm and 1 650 nm
wavelength . 16
6 Specific interface applications . 17
6.1 Applications with wavelength-division multiplexing (WDM) . 17
6.2 Fibre array applications. 17
Annex A (informative) Hazard level calculations . 19
A.1 General . 19
A.2 Example of calculations . 19
A.2.1 MMF applications at wavelengths between 700 nm and 1 050 nm . 19
A.2.2 SMF applications at wavelengths between 1 200 nm and 1 400 nm . 21
A.2.3 SMF applications at wavelengths between 1 400 nm and 1 650 nm . 22

Figure 1 – Graphic illustration of distance to source and aperture stop . 9
Figure 2 – Class 1 power P for MMF applications . 15
imax
Figure 3 – Class 1 power P for SMF applications (1 200 nm < λ < 1 400 nm) . 16
imax
Figure 4 – Class 1 power P for SMF applications (1 400 nm < λ < 1 650 nm) . 16
imax
Figure A.1 – Maximal power in MMF for Class 1 and Hazard level 1 (700 nm to
1 050 nm) . 21
Figure A.2 – Maximal power in SMF for Hazard levels 1 and 1M (1 200 nm to
1 400 nm) . 22
Figure A.3 – Maximal power in SMF for Hazard levels 1 and 1M (1 400 nm to
1 650 nm) . 23

Table 1 – Laser wavelength categorization for each specific parameter . 8
Table 2 – Wavelength ranges for fibre optic telecommunication systems . 8
Table 3 – Class 1 and Class 1M power criteria . 9

Table 4 – Measurement aperture diameters and distances for evaluation. 10
Table 5 – Values of 1/η under Conditions 1, 2 and 3 for MMFs . 11
Table 6 – Values of d/r under Conditions 1, 2 and 3 for SMFs . 11
Table 7 – Values of C and T for an extended light source . 13
6 2
Table 8 – Values of the correction factors C and C . 13
4 7
Table 9 – Accessible Emission Limits (AEL) . 13
Table A.1 – Power limits for Hazard levels 1 and 1M. 19
Table A.2 – Related parameters for MMF applications . 20
Table A.3 – AEL values for Classes 1 and 1M and Hazard levels 1 and 1M . 20

– 4 – IEC TR 62150-7:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC ACTIVE COMPONENTS AND DEVICES –
TEST AND MEASUREMENT PROCEDURES –

Part 7: Calculation methodology of laser safety class for
optical transceivers and transmitters

FOREWORD
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IEC TR 62150-7 has been prepared by subcommittee 86C: Fibre optic active components and
devices, of IEC technical committee 86: Fibre optics. It is a Technical Report.
The text of this Technical Report is based on the following documents:
Draft Report on voting
86C/1934/DTR 86C/1940/RVDTR
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Report is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 62150 series, published under the general title Fibre optic active
components and devices – Test and measurement procedures, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
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