SIST EN 61977:2016
(Main)Fibre optic interconnecting devices and passive components - Fibre optic filters - Generic specification (IEC 61977:2015)
Fibre optic interconnecting devices and passive components - Fibre optic filters - Generic specification (IEC 61977:2015)
This International Standard applies to the family of fibre optic filters. These components have
all of the following general features:
– they are passive for the reason that they contain no optoelectronic or other transducing
elements which can process the optical signal launched into the input port;
– they modify the spectral intensity distribution in order to select some wavelengths and
inhibit others;
– they are fixed, i.e. the modification of the spectral intensity distribution is fixed and cannot
be tuned;
– they have input and output ports or a common port (having both functions of input and
output) for the transmission of optical power; the ports are optical fibre or optical fibre
connectors;
– they differ according to their characteristics. They can be divided into the following
categories:
• short-wave pass (only wavelengths lower than or equal to a specified value are
passed);
• long-wave pass (only wavelengths greater than or equal to a specified value are
passed);
• band-pass (only an optical window is allowed);
• notch (only an optical window is inhibited).
It is also possible to have a combination of the above categories.
This standard establishes uniform requirements for the following:
– optical, mechanical and environmental properties.
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Lichtwellenleiterfilter - Fachgrundspezifikation (IEC 61977:2015)
Dispositifs d'interconnexion et composants passifs fibroniques - Filtres fibroniques - Spécification générique (IEC 61977:2015)
L'IEC 61977:2015 s'applique à la famille des filtres fibroniques. Ces composants possèdent l'ensemble des caractéristiques générales suivantes:
- ils sont passifs du fait qu'ils ne contiennent aucun élément optoélectronique ou autres éléments transducteurs susceptibles de traiter le signal optique injecté dans le port d'entrée;
- ils modifient la distribution d'intensité spectrale afin de sélectionner certaines longueurs d'onde et en neutraliser d'autres;
- ils sont fixes, c'est-à-dire que la modification de la distribution de l'intensité spectrale est constante et ne peut donc être accordée;
- ils comportent des ports d'entrée et de sortie ou un port commun (comportant à la fois les fonctions d'entrée et de sortie) pour la transmission de la puissance optique;
- les ports correspondent à la fibre optique ou aux connecteurs à fibres optiques;
- ils comportent des différences selon leurs caractéristiques.
Ils peuvent être répartis selon les catégories suivantes:
- passe-bas (seules les longueurs d'onde inférieures ou égales à une valeur spécifiée sont transmises);
- passe-haut (seules les longueurs d'onde supérieures ou égales à une valeur spécifiée sont transmises);
- passe-bande (seule une fenêtre optique est autorisée);
- coupe-bande (seule une fenêtre optique est neutralisée).
Une combinaison des catégories ci-dessus est également possible. La présente norme établit les exigences uniformes suivantes: les propriétés optiques, mécaniques et d'environnement. Cette troisième édition annule et remplace la deuxième édition parue en 2010. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- harmonisation d'un certain nombre de termes et définitions avec d'autres spécifications génériques;
- suppression de l'article relatif à l'évaluation de la qualité.
Mots clés: filtres fibroniques spécification generique
Optični spojni elementi in pasivne komponente - Filtri za optična vlakna - Rodovna specifikacija (IEC 61977:2015)
Ta mednarodni standard velja za družino filtrov za optična vlakna. Te komponente imajo vse od naslednjih splošnih značilnosti:
– so pasivne, ker ne vsebujejo nobenih optoelektronskih ali drugih pretvorniških elementov, ki lahko obdelujejo optični signal, ki prihaja v vhodna vrata;
– spreminjajo distribucijo spektralne intenzitete in tako izbirajo določene valovne dolžine ter zavirajo druge;
– so fiksne, tj. spreminjanje distribucije spektralne intenzitete je fiksno in ga ni mogoče uravnavati;
– imajo vhodna in izhodna vrata ali skupna vrata (ki imajo skupno funkcijo vhoda in izhoda) za prenos optične moči; vrata so optična vlakna ali konektorji optičnih vlaken;
– razlikujejo se glede na svoje lastnosti. Razdeliti jih je mogoče v naslednje kategorije
• kratkovalovni prehod (prehajajo le valovne dolžine, krajše ali enake določeni vrednosti);
• dolgovalovni prehod (prehajajo le valovne dolžine, daljše ali enake določeni vrednosti);
• pasovni prehod (omogočeno je le določeno optično okno);
• zareza (le določeno optično okno je zaustavljeno).
Možna je tudi kombinacija zgoraj navedenih kategorij.
Ta standard vzpostavlja enotne zahteve za naslednje:
– optične, mehanične in okoljske lastnosti.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61977:2016
01-februar-2016
1DGRPHãþD
SIST EN 61977:2010
2SWLþQLVSRMQLHOHPHQWLLQSDVLYQHNRPSRQHQWH)LOWUL]DRSWLþQDYODNQD5RGRYQD
VSHFLILNDFLMD ,(&
Fibre optic interconnecting devices and passive components - Fibre optic filters - Generic
specification (IEC 61977:2015)
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Lichtwellenleiterfilter -
Fachgrundspezifikation (IEC 61977:2015)
Dispositifs d'interconnexion et composants passifs fibroniques - Filtres fibroniques -
Spécification générique (IEC 61977:2015)
Ta slovenski standard je istoveten z: EN 61977:2015
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
SIST EN 61977:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61977:2016
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SIST EN 61977:2016
EUROPEAN STANDARD EN 61977
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2015
ICS 33.180.20 Supersedes EN 61977:2010
English Version
Fibre optic interconnecting devices and passive components -
Fibre optic filters - Generic specification
(IEC 61977:2015)
Dispositifs d'interconnexion et composants passifs Lichtwellenleiter - Verbindungselemente und passive
fibroniques - Filtres fibroniques - Spécification générique Bauteile - Lichtwellenleiterfilter - Fachgrundspezifikation
(IEC 61977:2015) (IEC 61977:2015)
This European Standard was approved by CENELEC on 2015-10-02. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61977:2015 E
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SIST EN 61977:2016
EN 61977:2015
European foreword
The text of document 86B/3861/CDV, future edition 3 of IEC 61977, prepared by SC 86B "Fibre optic
interconnecting devices and passive components" of IEC/TC 86 "Fibre optics" was submitted to the
IEC-CENELEC parallel vote and approved by CENELEC as EN 61977:2015.
The following dates are fixed:
(dop) 2016-07-02
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2016-10-02
• latest date by which the national standards conflicting with
the document have to be withdrawn
This document supersedes EN 61977:2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 61977:2015 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60068 NOTE Harmonized in EN 60068 series.
IEC 61754 NOTE Harmonized in EN 61754 series.
IEC 61978-1 NOTE Harmonized as EN 61978-1.
IEC 62005 NOTE Harmonized in EN 62005 series.
2
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SIST EN 61977:2016
EN 61977:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60027 series Letter symbols to be used in electrical - -
technology
IEC 60050-731 - International Electrotechnical Vocabulary - - -
Chapter 731: Optical fibre communication
IEC 60617 series Graphical symbols for diagrams - -
IEC 60695-11-5 - Fire hazard testing - EN 60695-11-5 -
Part 11-5: Test flames - Needle-flame test
method - Apparatus, confirmatory test
arrangement and guidance
IEC 60825 series Safety of laser products EN 60825 series
IEC 61300 series Fibre optic interconnecting devices and EN 61300 series
passive components - Basic test and
measurement procedures
IEC/TR 61930 - Fibre optic graphical symbology - -
ISO 129-1 - Technical drawings - Indication of - -
dimensions and tolerances -
Part 1: General principles
ISO 286-1 - Geometrical product specifications (GPS) - EN ISO 286-1 -
ISO code system for tolerances on linear
sizes -
Part 1: Basis of tolerances, deviations and
fits
ISO 1101 - Geometrical product specifications (GPS) - EN ISO 1101 -
Geometrical tolerancing - Tolerances of
form, orientation, location and run-out
ISO 8601 - Data elements and interchange formats - - -
Information interchange - Representation
of dates and times
3
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SIST EN 61977:2016
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SIST EN 61977:2016
IEC 61977
®
Edition 3.0 2015-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic filters –
Generic specification
Dispositifs d'interconnexion et composants passifs fibroniques – Filtres
fibroniques – Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-2876-0
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 61977:2016
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CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
3.1 Basic terms . 7
3.2 Component terms. 7
3.3 Performance terms . 9
4 Requirements . 12
4.1 Classification . 12
4.1.1 General . 12
4.1.2 Type . 13
4.1.3 Style . 13
4.1.4 Variant . 14
4.1.5 Normative reference extensions. 14
4.2 Documentation . 15
4.2.1 Symbols . 15
4.2.2 Specification system . 15
4.2.3 Drawings . 16
4.2.4 Test and measurements . 17
4.2.5 Test report . 17
4.2.6 Instructions for use . 17
4.3 Standardisation system . 17
4.3.1 Interface standards . 17
4.3.2 Performance standards . 18
4.3.3 Reliability standards . 18
4.3.4 Interlinking . 19
4.4 Design and construction . 20
4.4.1 Materials . 20
4.4.2 Workmanship . 21
4.5 Performance requirements . 21
4.6 Identification and marking . 21
4.6.1 General . 21
4.6.2 Variant identification number . 21
4.6.3 Component marking . 21
4.6.4 Package marking . 21
4.7 Packaging . 22
4.8 Storage conditions . 22
4.9 Safety . 22
Annex A (informative) Example of etalon filter technology . 23
A.1 Operating principle of etalon filter . 23
A.2 Transmission characteristics of etalon filter . 23
Annex B (informative) Example of fibre Bragg grating (FBG) filter technology . 25
B.1 Operating principle of FBG . 25
B.2 Example of usage of an FBG . 25
Annex C (informative) Example of thin film filter technology . 27
C.1 Example of thin film filter technology . 27
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IEC 61977:2015 IEC 2015 – 3 –
C.2 Example of application of thin film filters . 27
Bibliography . 29
Figure 1 – Illustration of passband ripple . 9
Figure 2 – Illustration of a stopband . 10
Figure 3 – Illustration of maximum insertion loss within a passband . 11
Figure 4 – Illustration of minimum insertion loss within a passband . 11
Figure 5 – Illustration of X dB bandwidth . 12
Figure 6 – Optic filter style configurations . 14
Figure 7 – Standards currently under preparation . 20
Figure A.1 – Schematic diagram of an etalon . 23
Figure A.2 – Transmission characteristic of an etalon . 24
Figure B.1 – Technology of a fibre Bragg grating . 25
Figure B.2 – Application of an optical add/drop module . 26
Figure B.3 – Application of an OTDR sensor . 26
Figure B.4 – Application of the wavelength stabilizer for a 980 nm pump LD . 26
Figure C.1 – Structure of a multilayer thin-film . 27
Figure C.2 – Application for a GFF for an optical fibre amplifier . 28
Figure C.3 – Application for a BPF for an optical fibre amplifier . 28
Table 1 – Example of a typical filter classification . 13
Table 2 – The IEC specification structure . 15
Table 3 – Standards interlink matrix . 20
Table 4 – Quality assurance options . 20
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
FIBRE OPTIC FILTERS – GENERIC SPECIFICATION
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). 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. 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 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 IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61977 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition published in 2010. It constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) harmonization of a number of terms and definitions with other generic specifications;
b) deletion of the quality assessment level clause.
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SIST EN 61977:2016
IEC 61977:2015 IEC 2015 – 5 –
The text of this standard is based on the following documents:
CDV Report on voting
86B/3861/CDV 86B/3917/RVC
Full information on the voting for the approval of this standard 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
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.
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FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE
COMPONENTS – FIBRE OPTIC FILTERS – GENERIC SPECIFICATION
1 Scope
This International Standard applies to the family of fibre optic filters. These components have
all of the following general features:
– they are passive for the reason that they contain no optoelectronic or other transducing
elements which can process the optical signal launched into the input port;
– they modify the spectral intensity distribution in order to select some wavelengths and
inhibit others;
– they are fixed, i.e. the modification of the spectral intensity distribution is fixed and cannot
be tuned;
– they have input and output ports or a common port (having both functions of input and
output) for the transmission of optical power; the ports are optical fibre or optical fibre
connectors;
– they differ according to their characteristics. They can be divided into the following
categories:
• short-wave pass (only wavelengths lower than or equal to a specified value are
passed);
• long-wave pass (only wavelengths greater than or equal to a specified value are
passed);
• band-pass (only an optical window is allowed);
• notch (only an optical window is inhibited).
It is also possible to have a combination of the above categories.
This standard establishes uniform requirements for the following:
– optical, mechanical and environmental properties.
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.
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050-731, International Electrotechnical Vocabulary – Chapter 731: Optical fibre
communication (available at http://www.electropedia.org)
IEC 60617 (all parts), Graphical symbols for diagrams (available at http://std.iec.ch/iec60617)
IEC 60695-11-5, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method –
Apparatus, confirmatory test arrangement and guidance
IEC 60825 (all parts), Safety of laser products
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SIST EN 61977:2016
IEC 61977:2015 IEC 2015 – 7 –
IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures
IEC TR 61930, Fibre optic graphical symbology
ISO 129-1, Technical drawings – Indication of dimensions and tolerances – Part 1: General
principles
ISO 286-1, Geometrical product specifications (GPS) – ISO code system for tolerances on
linear sizes – Part 1: Basis of tolerances, deviations and fits
ISO 1101, Geometrical product specifications (GPS) – Geometrical tolerancing – Tolerances
of form, orientation, location and run-out
ISO 8601, Data elements and interchange formats – Information interchange –
Representation of dates and times
3 Terms and definitions
For the purposes of this document the terms and definitions given in IEC 60050-731 and the
following apply.
3.1 Basic terms
3.1.1
port
optical fibre or optical fibre connector attached to a passive component for the entry and/or
exit of the optical power (input and/or output port)
3.2 Component terms
3.2.1
BPF
band-pass filterfibre optic filter designed to allow signals between two specific wavelengths to
pass
Note 1 to entry: This note applies to the French language only.
3.2.2
etalon
device consisting of a transparent plane-parallel plate with two reflecting surfaces, or two
parallel reflecting mirrors
Note 1 to entry: The varying transmission function of an etalon is caused by interference between the multiple
reflections of light between the two reflecting surfaces.
Note 2 to entry: Annex A describes the outline of etalon technology.
3.2.3
FBG
fibre Bragg grating
fibre optic device which has a short periodic variation to the refractive index of the fibre core
along the fibre
Note 1 to entry: An FBG can reflect particular wavelengths of light and transmit other wavelengths.
Note 2 to entry: Annex B describes the outline of FBG technology.
Note 3 to entry: This note applies to the French language only.
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3.2.4
fibre optic filter
passive component used in fibre optic transmission to modify the spectral intensity distribution
of a signal in order to transmit or attenuate some wavelengths and block some others
Note 1 to entry: The wavelength band which transmits or attenuates the signal is called the passband. There may
be more than one passband.
3.2.5
GFF
GEQ
gain flattening filter
gain equalizer
device designed to have the inverse characteristic of the wavelength dependent insertion loss
of an optical device
Note 1 to entry: A GFF (GEQ) is used for the purpose of minimizing the wavelength dependent loss of a fibre
optic device.
Note 2 to entry: A GFF (GEQ) is typically used with (in) an optical amplifier.
Note 3 to entry: This note applies to the French language only.
Note 4 to entry: This note applies to the French language only.
3.2.6
long wavelength pass filter
LWPF
fibre optic filter that passes long wavelength signals but reduces the amplitude of short
wavelength signals
Note 1 to entry: This note applies to the French language only.
3.2.7
notch filter
fibre optic filter that passes all wavelengths except those in a stop band centred on a
particular wavelength
3.2.8
reflecting type fibre optic filter
fibre optic filter in which the input and output ports are coincident
3.2.9
short wavelength pass filter
SWPF
fibre optic filter that passes short wavelength signals but reduces the amplitude of long
wavelength signals
Note 1 to entry: This note applies to the French language only.
3.2.10
thin-film filter
TFF
fibre optic filter which passes particular wavelength band(s) and reflects all other
wavelengths by using the interference effect of thin-film
Note 1 to entry: One of the typical TFF is a dielectric multi-layer film filter. Annex C describes the outline of TFF
technology.
Note 2 to entry: This note applies to the French language only.
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IEC 61977:2015 IEC 2015 – 9 –
3.2.11
transmitting type fibre optic filter
fibre optic filter in which the input and output ports are separated
3.3 Performance terms
3.3.1
operating wavelength
nominal wavelength λ , at which a fibre optic filter operates with the specified performances
h
Note 1 to entry: The term "operating wavelength" includes the nominally transmitting wavelength, and designated
attenuation/isolation wavelength.
3.3.2
operating wavelength range
specified range of wavelengths including all operating wavelengths
Note 1 to entry: It includes all passbands and isolation wavelength ranges.
3.3.3
passband
wavelength range within which a passive optical component is required to operate with optical
attenuation less than or equal to a specified optical attenuation value
Note 1 to entry: There may be one or more passbands for a fibre optic filter.
3.3.4
passband ripple
maximum peak-to-peak variation of the insertion loss (absolute value) over the passband
Note 1 to entry: See Figure 1.
50
Passband
Passband
Passband ripple
0
Wavelength
IEC
a) – Passband ripple at band edges b) – Passband ripple in band
Figure 1 – Illustration of passband ripple
Note 2 to entry: For a WWDM (wide wavelength division multiplexing) fibre optic filter which has only one
passband, the term spectral ripple or flatness is used instead of passband ripple.
3.3.5
insertion loss
reduction of optical power in a passband, when transmitted between the ports of a two-port
fibre optic filter
Optical attenuation (dB)
Passband ripple
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Note 1 to entry: The insertion loss is expressed in decibels and defined as:
P
out
a = −10log
10
P
in
where
P is the optical power launched into one of the two ports
in
P is the optical power received from the other port
out
Note 2 to entry: The insertion loss is a function of wavelength.
3.3.6
free spectral range
in the case of a periodic spectral response of a fibre optic filter, difference between two
adjacent operating wavelengths
3.3.7
isolation wavelength
nominal wavelength λ (where λ ≠ λ ), that is nominally suppressed by a fibre optic filter
k h k
3.3.8
isolation wavelength range
stopband
specified range of wavelengths from λ to λ around the isolation wavelength λ , that
kmin kmax k
are nominally suppressed by a f
...
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