IEC TR 61292-8:2019

IEC TR 61292-8 ®
Edition 1.0 2019-01
TECHNICAL
REPORT
colour
inside
Optical amplifiers –
Part 8: High-power amplifiers
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IEC TR 61292-8 ®
Edition 1.0 2019-01
TECHNICAL
REPORT
colour
inside
Optical amplifiers –
Part 8: High-power amplifiers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.10, 33.180.30 ISBN 978-2-8322-6421-8

– 2 – IEC TR 61292-8:2019  IEC 2019
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 6
4 General . 7
5 Configuration . 7
5.1 EDFAs using combined single-mode pump laser diodes . 7
5.2 Cladding pumped fibre amplifier . 9
5.2.1 General . 9
5.2.2 Cladding-pumped methodology . 9
6 Test method . 13
7 Special considerations for high-power optical amplifiers . 14
7.1 Design considerations . 14
7.2 Handling and safety consideration . 14
Annex A (informative)  Application of high-power OAs . 15
A.1 General . 15
A.2 Power amplifier for FTTH PON systems . 15
A.3 Ultra-long-haul DWDM transport system . 15
Annex B (informative) IEC documents on high optical power . 16
Bibliography . 17

Figure 1 – Schematic diagram of EDFA using multiplexed single-mode pump lasers . 7
Figure 2 – Output characteristics of a high-power EDFA . 8
Figure 3 – Schematic diagram of an EDFA using a cascaded Raman resonator . 8
Figure 4 – Schematic diagram of a cladding-pumped fibre amplifier . 9
Figure 5 – Schematic of cladding pumping . 9
Figure 6 – Schematic structure of end-pumping . 10
Figure 7 – Schematic structure of a fibre bundle power combiner. 10
Figure 8 – V-groove side pumping arrangement . 11
Figure 9 – Schematic diagram of a cross section of an example of double-
cladding fibre . 11
Figure 10 – Cross-section of the hole-assisted double cladding fibre . 12
Figure 11 – Typical optical output power vs drive current on 980-nm multimode pump
laser modules . 12
Figure 12 – Configuration of double-cladding pumped amplifier . 13
Figure 13 – Typical power conversion efficiency (PCE) of erbium - ytterbium co-doped
double-clad (DC) fibre amplifier . 13
Figure 14 –Test setup to measure optical output power and gain . 14
Figure A.1 – Schematic diagram of FTTH system adapted high-power OA . 15

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL AMPLIFIERS –
Part 8: High-power amplifiers
FOREWORD
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The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a Technical Report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC TR 61292-8, which is a technical report, has been prepared by subcommittee 86C: Fibre
optic systems and active devices, of IEC technical committee 86: Fibre optics.
Optoelectronics Industry and Technology Development Association (OITDA), Technical Paper
OITDA/TP 26/AM, General information for high power optical amplifier has served as the
basis for the elaboration of this Technical Report.

– 4 – IEC TR 61292-8:2019  IEC 2019
The text of this Technical Report is based on the following documents:
Draft TR Report on voting
86C/1534/DTR 86C/1549/RVDTR
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 document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61292 series, published under the general title Optical amplifiers,
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 "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document 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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INTRODUCTION
Optical amplifiers (OAs) are necessary components as booster, line and pre-amplifiers for
current optical network systems. IEC TC 86/SC 86C, therefore, has published many standards
for OAs. Since the mid-2000s, high optical output power amplifiers have been used for
applications in passive optical network (PON) and community access television (CATV)
systems.
Although OAs with optical power greater than 500 mW are deployed in the field, there are
very few documents addressing high optical power applications.
This document provides a better understanding of high-power amplifiers, especially those
based on cladding pump technology, and addresses the handling of high optical power.

– 6 – IEC TR 61292-8:2019  IEC 2019
OPTICAL AMPLIFIERS –
Part 8: High-power amplifiers
1 Scope
This document deals with high-power optical amplifiers. It provides general information
relating to high-power optical amplifiers with an output power greater than 500 mW for the
fibre communication field. It covers the following aspects:
– general information;
– example of the optical amplifier's configuration realizing high optical output power;
– test method for optical output power and gain;
– considerations on high-power optical amplifiers.
Potential applications of hig
...