Optical amplifier technical reports - Part 2: Theoretical background for noise figure evaluation using the electrical spectrum analyzer

Applies to all commercially available optical amplifiers including optical fibre amplifiers using active fibres and semiconductor optical amplifiers using semiconductor gain media. The object is to provide the theoretical background to clause 6 (Calculation) of IEC 61290-3-2.

General Information

Status
Published
Publication Date
19-Jan-2003
Current Stage
PPUB - Publication issued
Start Date
20-Jan-2003
Completion Date
20-Jan-2003
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IEC TR 61292-2:2003 - Optical amplifier technical reports - Part 2: Theoretical background for noise figure evaluation using the electrical spectrum analyzer
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TECHNICAL IEC
REPORT
TR 61292-2
First edition
2003-01
Optical amplifier technical reports –
Part 2:
Theoretical background for noise figure evaluation
using the electrical spectrum analyzer
Reference number
IEC/TR 61292-2:2003(E)
---------------------- Page: 1 ----------------------
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
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---------------------- Page: 2 ----------------------
TECHNICAL IEC
REPORT
TR 61292-2
First edition
2003-01
Optical amplifier technical reports –
Part 2:
Theoretical background for noise figure evaluation
using the electrical spectrum analyzer
 IEC 2003  Copyright - all rights reserved

No part of this publication may be reproduced or utilized in any form or by any means, electronic or

mechanical, including photocopying and microfilm, without permission in writing from the publisher.

International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland

Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch

PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue
---------------------- Page: 3 ----------------------
– 2 – TR 61292-2  IEC:2003(E)
CONTENTS

FOREWORD .......................................................................................................................... 3

INTRODUCTION ....................................................................................................................4

1 Scope and object ............................................................................................................. 5

2 Normative references....................................................................................................... 5

3 Theoretical background of calibration ............................................................................... 5

3.1 Calculation for photocurrent measurement alternative ............................................. 7

3.2 Calculation of source RIN........................................................................................ 7

4 Theoretical background of noise factor calculation............................................................ 8

Annex A (informative) List of symbols and abbreviations .......................................................11

Figure 1 – Noise figure calibration setup ................................................................................. 5

Figure 2 – Equipment for electrical noise figure test ................................................................ 8

---------------------- Page: 4 ----------------------
TR 61292-2  IEC:2003(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL AMPLIFIER TECHNICAL REPORTS –
Part 2: Theoretical background for noise figure evaluation
using the electrical spectrum analyzer
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 specifications, 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 technical report may be the subject of

patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.

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 61292-2, which is a technical report, has been prepared by subcommittee 86C: Fibre optic

systems and active devices, of IEC technical committee 86: Fibre optics.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
86C/418/DTR 86C/474/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.

The committee has decided that the contents of this publication will remain unchanged until 2008.

At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
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– 4 – TR 61292-2  IEC:2003(E)
INTRODUCTION

This Technical Report should be read in conjunction with IEC 61290-3-2. To enhance the

clarity of this document, some of the text in document 61290-3-2 is repeated here. Definitions

of many terms and parameters contained in this Technical Report can be found in
IEC 61291-1.

Each abbreviation introduced in this Technical Report is generally explained in the text

the first time it appears. However, for an easier understanding of the whole text, a list

of the abbreviations used in this Technical Report is given in Annex A.
---------------------- Page: 6 ----------------------
TR 61292-2  IEC:2003(E) – 5 –
OPTICAL AMPLIFIER TECHNICAL REPORTS –
Part 2: Theoretical background for noise figure evaluation
using the electrical spectrum analyzer
1 Scope and object

This Technical Report applies to all commercially available optical amplifiers (Oas) including

optical fibre amplifiers (OFAs) using active fibres and semiconductor optical amplifiers (SOAs)

using semiconductor gain media.

The object of this Technical Report is to provide the theoretical background to Clause 6

(Calculation) of IEC 61290-3-2.
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 61290-3: Optical fibre amplifiers – Basic specification – Test methods for noise figure

parameters

IEC 61290-3-2: Optical fibre amplifier test methods – Part 3-2: Noise figure parameters –

Electrical spectrum analyzer method
IEC 61291-1: Optical fibre amplifiers – Part 1: Generic specification
3 Theoretical background of calibration
The calibration setup is shown in Figure 1.
Receiver module
Source module
Variable output El. spectrum
Variable input Detector
attenuator analyser
attenuator
ESA
dB dB
Optical
DFB laser Polarisation
Electrical
filter
with isolator controller
amplifier
(optional)
Possibly separable
Modulation
source
Optical
Power meter
power meter
jumper cable
IEC 2970/02
Figure 1 – Noise figure calibration setup
---------------------- Page: 7 ----------------------
– 6 – TR 61292-2  IEC:2003(E)

The following quantities are obtained during the calibration process; notice that all noise

measurement results are to be understood as ESA power levels after subtraction of the

thermal noise level:
P is optical input power at 0 dB setting of input attenuator.
in,0
S is electrical power of the modulation signal at 0 dB setting of
...

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