IEC 62148-22:2023

IEC 62148-22
®

Edition 1.0 2023-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Fibre optic active components and devices – Package and interface standards –
Part 22: 25 Gbit/s directly modulated laser packages with temperature control
unit

Composants et dispositifs actifs fibroniques – Normes de boîtier et d’interface –
Partie 22: Boîtiers pour laser à modulation directe 25 Gbit/s équipés d’une unité
de régulation de température

IEC 62148-22:2023-02(en-fr)

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IEC 62148-22

®


Edition 1.0 2023-02




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Fibre optic active components and devices – Package and interface standards –

Part 22: 25 Gbit/s directly modulated laser packages with temperature control

unit



Composants et dispositifs actifs fibroniques – Normes de boîtier et d’interface –

Partie 22: Boîtiers pour laser à modulation directe 25 Gbit/s équipés d’une unité


de régulation de température













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.180.20 ISBN 978-2-8322-6528-4




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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– 2 – IEC 62148-22:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 8
4 Specification of the optical interface . 8
4.1 Optical connector interface . 8
4.2 Pigtail interface . 8
5 Specification of electrical interface . 8
5.1 General . 8
5.2 Electrical interface specifications for DML TO-can package . 9
5.2.1 5-pin . 9
5.2.2 7-pin . 9
5.2.3 8-pin . 10
5.3 Electrical interface specifications for DML TOSA module packages . 11
5.3.1 5-pin . 11
5.3.2 7-pin . 11
5.3.3 8-pin . 12
6 Outline. 12
6.1 General . 12
6.2 Outline of DML TO-can package . 12
6.2.1 Drawing of case outline . 12
6.2.2 Dimensions of DML TO-can packages . 14
6.3 Outline of DML TOSA module package with an LC connector . 15
6.3.1 Drawing of case outline . 15
6.3.2 Dimensions of DML TOSA module package with LC connector . 17
6.3.3 Dimensions of LC type optical receptacle . 18
6.4 Outlines of DML pigtail package . 18
6.4.1 Drawing of case outline . 18
6.4.2 Dimensions of DML pigtail package . 19
6.4.3 Optical connector. 21
Bibliography . 22

Figure 1 – Electrical terminal numbering assignments for 5-pin type TO-can packages
with temperature control unit . 9
Figure 2 – Electrical terminal numbering assignments for 7-pin type TO-can packages
with temperature control unit . 10
Figure 3 – Electrical terminal numbering assignments for 8-pin type TO-can packages
with temperature control unit . 10
Figure 4 – Electrical terminal numbering assignments for 5-pin TOSA module packages
with temperature control unit . 11
Figure 5 – Electrical terminal numbering assignments for 7-pin TOSA module packages
with temperature control unit . 12
Figure 6 – Electrical terminal numbering assignments for 8-pin TOSA module packages
with temperature control unit . 12

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IEC 62148-22:2023 © IEC 2023 – 3 –
Figure 7 – Case outline of TO-can with spherical lens . 13
Figure 8 – Case outline of TO-can with aspherical lens . 13
Figure 9 – Pin configuration for 5-pin TO-can . 13
Figure 10 – Pin configuration for 7-pin TO-can . 14
Figure 11 – Pin configuration for 8-pin TO-can . 14
Figure 12 – Schematic diagram of DML TOSA module packages with LC connector . 17
Figure 13 – Schematic diagram and pin-out of DML pigtail package . 19

Table 1 – Pin function definitions for 5-pin type DML TO-can packages . 9
Table 2 – Pin function definitions for 7-pin type DML TO-can packages . 10
Table 3 – Pin function definitions for 8-pin type DML TO-can packages . 11
Table 4 – Dimensions of DML TO-can package . 15
Table 5 – Dimensions of DML TOSA module package with LC connector . 17
Table 6 – Pin out terminals of DML TOSA module packages with LC connector and
with flexible printed circuit board . 18
Table 7 – Dimensions of DML pigtail package . 20
Table 8 – Pin out terminals of DML pigtail package . 21

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– 4 – IEC 62148-22:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

FIBRE OPTIC ACTIVE COMPONENTS AND DEVICES –
PACKAGE AND INTERFACE STANDARDS –

Part 22: 25 Gbit/s directly modulated laser packages
with temperature control unit

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
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6) All users should ensure that they have the latest edition of this publication.
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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.
IEC 62148-22 has been prepared by subcommittee 86C: Fibre optic systems and active devices,
of IEC technical committee 86: Fibre optics. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
86C/1851/FDIS 86C/1859/RVD

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 International Standard is English.

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IEC 62148-22:2023 © IEC 2023 – 5 –
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 of the IEC 62148 series, published under the general title Fibre optic active
components and devices – Package and interface standards, 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,
• replaced by a revised edition, or
• amended.

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– 6 – IEC 62148-22:2023 © IEC 2023
INTRODUCTION
Fibre optic laser devices are used to convert electrical signals into optical signals. This
document covers the physical dimensions and interfaces for directly modulated laser (DML)
packages which are intended to be applied to 25 Gbit/s transceivers.

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IEC 62148-22:2023 © IEC 2023 – 7 –
FIBRE OPTIC ACTIVE COMPONENTS AND DEVICES –
PACKAGE AND INTERFACE STANDARDS –

Part 22: 25 Gbit/s directly modulated laser packages
with temperature control unit



1 Scope
This part of IEC 62148 defines the physical dimensions and interface specifications for directly
modulated laser (DML) devices used in optical telecommunication and optical data transmission
applications.
The intent of this document is to adequately specify the physical requirements for DML devices
so as to enable mechanical interchangeability of laser devices or transmitters complying with
this document both at the printed circuit board and for any panel-mounting requirements.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for
class B single-mode fibres
IEC 61753 (all parts), Fibre optic interconnecting devices and passive components –
Performance standard
IEC 61754 (all parts), Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces
IEC 61755 (all parts), Fibre optic interconnecting devices and passive components – Fibre optic
connector optical interfaces
IEC 61754-20, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 20: Type LC connector family
IEC 62148-1, Fibre optic active components and devices – Package and interface standards –
Part 1: General and guidance
3 Terms, definitions and abbreviated terms
For the purposes of this document, the terms and definitions given in IEC 62148-1 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp

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– 8 – IEC 62148-22:2023 © IEC 2023
3.1 Terms and definitions
3.1.1
pigtail package
package type of photonic devices which has a length of fibre attachment for both optical input
and output ports
[SOURCE: IEC 62148-15:2021, 3.1.1]
3.1.2
TOSA module
optical module that converts electrical signals into optical signals and that is connected to an
optical fibre
[SOURCE: IEC 62148-18:2014 , 3.1.1]
3.2 Abbreviated terms
CAN airtight sealed metal container (see IEC 60747-1)
DML directly modulated laser
LD laser diode
MPD monitor photodiode
NC not connected
PD photodiode
RH heat resistor
RTH thermistor resistor
TEC thermo-electric cooler
TO transistor outline
TOSA transmitter optical subassembly
4 Specification of the optical interface
4.1 Optical connector interface
This document applies to the LC optical connector interfaces. Detailed dimensions of the optical
receptacle are specified in IEC 61754-20.
4.2 Pigtail interface
All single-mode optical fibres defined in IEC 60793-2-50 shall apply.
All optical connectors defined in the IEC 61753 series, IEC 61754 series, and IEC 61755 series
are applicable when a pigtail shall be terminated with an optical connector.
5 Specification of electrical interface
5.1 General
The specifications for the electrical interfaces of DML TO-can packages are described in 5.2.
The specifications for the electrical interfaces of DML for TOSA module and DML pigtail
packages are described in 5.3. The electrical interface specifications define only the basic
functionality of each pin.

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IEC 62148-22:2023 © IEC 2023 – 9 –
5.2 Electrical interface specifications for DML TO-can package
5.2.1 5-pin
The electrical terminal numbering assignments for 5-pin type TO-can packages with
temperature control unit are shown in Figure 1. There are two different configurations.
Figure 1 a) shows the first configuration, where pin 1 is offset from the centre of the TO-can,
and Figure 1 b) shows the second configuration with a centred pin 1. The pin function definitions
for the two 5-pin TO-can packages are specified in Table 1.

a) With offset ground pin 1 b) With centred ground pin 1

Figure 1 – Electrical terminal numbering assignments for 5-pin type
TO-can packages with temperature control unit
Table 1 – Pin function definitions for 5-pin type DML TO-can packages
Function
Pin number Option 1 Option 2
1 Ground, MPD anode, and RH cathode Ground and RH cathode
2 LD anode LD anode
3 RH anode RH anode and MPD anode
4 MPD cathode MPD cathode
5 LD cathode LD cathode

5.2.2 7-pin
The electrical terminal numbering assignments for 7-pin type TO-can packages with
temperature control unit are shown in Figure 2. There are two different configurations.
Figure 2 a) shows the configuration with a centred pin 1, and Figure 2 b) shows the
configuration where pin 1 is offset from the centre. The pin function definitions for the two 7-pin
TO-can packages are specified in Table 2.

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– 10 – IEC 62148-22:2023 © IEC 2023

a) With centred ground pin 1 b) With offset ground pin 1

Figure 2 – Electrical terminal numbering assignments for 7-pin type
TO-can packages with temperature control unit
Table 2 – Pin function definitions for 7-pin type DML TO-can packages
Function
Pin number
Option 1 Option 2 Option 3
Ground, RTH cathode, and Ground, RTH cathode, and
1 Ground
MPD cathode MPD anode
2 LD anode LD anode LD anode
3 RTH anode MPD cathode RTH anode
4 TEC anode TEC anode TEC cathode
5 TEC cathode TEC cathode TEC anode
6 MPD anode MPD anode MPD cathode
7 LD cathode LD cathode LD cathode

5.2.3 8-pin
The electrical terminal numbering assignments for 8-pin type TO-can packages with
temperature control unit are shown in Figure 3. The pin function definitions for 8-pin TO-can
packages are specified in Table 3.

Figure 3 – Electrical terminal numbering assignments for 8-pin type
TO-can packages with temperature control unit

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IEC 62148-22:2023 © IEC 2023 – 11 –
Table 3 – Pin function definitions for 8-pin type DML TO-can packages
Function
Pin number
Option 1 Option 2 Option 3
Ground and RTH cathode Ground, RTH cathode, and Ground, RTH cathode, and
1
MPD anode MPD anode
2 RTH anode RTH anode RTH anode
3 MPD cathode MPD cathode MPD cathode
4 TEC cathode TEC cathode TEC cathode
5 TEC anode TEC anode TEC anode
MPD anode Ground, RTH cathode, and NC
6
MPD anode
7 LD cathode LD cathode LD cathode
8 LD anode LD anode LD anode

5.3 Electrical interface specifications for DML TOSA module packages
5.3.1 5-pin
The pin number assignments for 5-pin TOSA module packages are shown in Figure 4.
Figure 4 a) shows the configuration where pin 1 is offset from the centre, and Figure 4 b) shows
the configuration with pin 1 centred. The pin function definitions for DML TOSA module
packages are the same as specified in Table 1 for DML TO-can packages.

a) With offset ground pin 1 b) With centred ground pin 1

Figure 4 – Electrical terminal numbering assignments for 5-pin
TOSA module packages with temperature control unit
5.3.2 7-pin
The pin number assignments for 7-pin TOSA module packages are shown in Figure 5.
Figure 5 a) shows the configuration with pin 1 centred, and Figure 5 b) shows the configuration
with pin 1 offset from the centre. The pin function definitions for DML TOSA module packages
are the same as specified in Table 2 for DML TO-can packages.

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– 12 – IEC 62148-22:2023 © IEC 2023

a) With centred ground pin 1 b) With offset ground pin 1

Figure 5 – Electrical terminal numbering assignments for 7-pin
TOSA module packages with temperature control unit
5.3.3 8-pin
The pin number assignments for 8-pin TOSA module packages are shown in Figure 6. The pin
function definitions for DML TOSA module packages are the same as specified in Table 3 for
DML TO-can packages.

Figure 6 – Electrical terminal numbering assignments for 8-pin
TOSA module packages with temperature control unit
6 Outline
6.1 General
The outline dimensions and electrical interface dimensions for DML TO-can packages are
specified in 6.2, those for DML TOSA module packages with LC connector are specified in 6.3,
and those for DML pigtail package are specified in 6.4.
6.2 Outline of DML TO-can package
6.2.1 Drawing of case outline
Figure 7 shows the case outline for DML TO-can packages with spherical lens, whereas
Figure 8 shows the case outline for DML TO-can packages with aspherical lens.

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IEC 62148-22:2023 © IEC 2023 – 13 –

Figure 7 – Case outline of TO-can with spherical lens

Figure 8 – Case outline of TO-can with aspherical lens
Figure 9 a) and b) show the pin configuration for DML TO-can packages with 5 pins, Figure 10
a) and b) show the pin configuration for DML TO-can packages with 7 pins, and Figure 11 shows
the pin configuration for DML TO-can packages with 8 pins.

a) With offset ground pin 1 b) With centred ground pin 1

Figure 9 – Pin configuration for 5-pin TO-can

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– 14 – IEC 62148-22:2023 © IEC 2023

a) With centred ground pin 1 b) With offset ground pin 1

Figure 10 – Pin configuration for 7-pin TO-can

Figure 11 – Pin configuration for 8-pin TO-can
6.2.2 Dimensions of DML TO-can packages
The dimensions of the various DML TO-can packages are specified in Table 4.

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IEC 62148-22:2023 © IEC 2023 – 15 –
Table 4 – Dimensions of DML TO-can package
Dimensions
Reference Remarks
Minimum Maximum
5,5 mm 5,7 mm For TO-56
φD
5,92 mm 6,05 mm For TO-60
3,50 mm 3,62 mm For spherical lens
φD
1
4,8 mm 5,2 mm For aspherical lens
A 6,26 mm 6,46 mm —
K 0,05 mm 0,25 mm —
A 3,77 mm 4,99 mm Only for spherical lens
1
A 4,36 mm 5,73 mm
2
φb 0,25 mm 0,35 mm —
L 7,0 mm 10,5 mm —
φc 0,65 mm 0,75 mm Only for 5-pin type
φa 2,39 mm 2,69 mm Only for 5-pin type
β 40° 60° Only for 5-pin type
n 1,15 mm 1,50 mm Only for 7-pin type
p 1,1 mm 1,5 mm Only for 7-pin type
q 0,55 mm 0,75 mm Only for 7-pin type
B 0 mm 0,08 mm Only for 5-pin type
1
B 0 mm 0,08 mm Only for 7-pin type
2
x 0,03 mm 0,13 mm Only for 7-pin type
y 0,95 mm 1,15 mm Only for 7-pin type
z 1,65 mm 1,95 mm Only for 7-pin type
Φc 0,2 mm 0,3 mm Only for 8-pin type
1
Φb 0,25 mm 0,35 mm Only for 8-pin ty
...