Sumitomo Electric Industries, Ltd.
Part No.: SLT2A70-xR Series
Document No.: HUW0424144-01C
Date of issue: December 25, 2007
Page 1 of 7
Technical Specification
of
1.3µm MQW-FP Laser Diode Module
for 4.25Gb/s transmission:
(Transmitter Optical Sub-assembly in Small PKG)
SLT2A70-xR Series
RoHS Compliant
Sumitomo Electric Industries, Ltd.
Part No.: SLT2A70-xR Series
Document No.: HUW0424144-01C
Date of issue: December 25, 2007
Page 2 of 7
1. General
SLT2A70-xR Series are 1.31µm InGaAsP/InP MQW-FP laser diode modules designed for
fiber optic communication systems. This module is a transmitter optical sub-assembly with low
threshold current and high performance at high temperature, and is ideally suitable for a long
distance at 4.25Gbps transmission applications.
A laser diode is mounted into a φ3.8mm coaxial package integrated with an InGaAs monitor PD, a
singe-mode fiber-stub and a solid sleeve for the optical connector with φ1.25mm ferrule.
2. Package dimension and pin assignment
(See attached the outline drawing.)
3. Absolute maximum ratings
Parameter Symbol Ratings Unit
Storage temperature Tstg -40~+85 °C
Operating case temperature Top -40~+85 °C
Fiber output power Pf 5 mW
Forward current (LD) IfL 150 mA
Reverse voltage (LD) VrL 2 V
Reverse voltage (PD) VrP 15 V
Reverse current (PD) IrP 2 mA
Soldering temperature (<10s) Stemp 260 °C
Sumitomo Electric Industries, Ltd.
Part No.: SLT2A70-xR Series
Document No.: HUW0424144-01C
Date of issue: December 25, 2007
Page 3 of 7
4. Electrical and optical characteristics (Pf=0.4mW, SMF(10/125µm), Tc=+25±2°C, unless otherwise noted.)
Parameter Symbol Condition Min. Typ. Max. Unit
CW — 5 15 Threshold current
Ith
CW, Tc=-40~+85°C 1 — 30 mA
CW, If=Ith+20mA 0.25 0.40 0.65Optical output power Pf CW, If=Ith+20mA, Tc=-40~+85°C 0.125 — — mW
Forward voltage Vf CW, Tc=-40~+85°C — — 1.6 V
Slope efficiency Se CW, Tc=-40~+85°C 0.00625 — — mW/mA
Peak wavelength λp CW, Tc=-40~+85°C 1275 — 1350 nm
Wavelength temp coef. λct CW, Tc=-40~+85°C — — 0.5 nm/°C
Spectral width Δλ CW, RMS — — 2.5 nm
Tracking error
ΔPf Im hold(@Pf=0.4mW(25°C))
CW, Tc=-40~+85°C -1.5 — 1.5 dB
Rise time tr — — 0.08
Fall time tf 4.25Gbps, PRBS=2^31-1,
ER=6dB, 20-80%, Tc=-40~+85°C — — 0.08 ns
Monitor current Im CW, VrP=5V, 50 — — µA
VrP=5V — 1 10 Monitor dark current Id VrP=5V, Tc=-40~+85°C — — 100 nA
Monitor capacitance C VrP=5V, f=1MHz — — 10 pF
Connector repeatability — CW, SEI master plug -1 — +1 dB
Sumitomo Electric Industries, Ltd.
Part No.: SLT2A70-xR Series
Document No.: HUW0424144-01C
Date of issue: December 25, 2007
Page 4 of 7
5. Ordering information
Part number Pin assignment Number of pin Pin cercle diameter
SLT2A70-LR TypeA 4 1.35±0.20
SLT2A76-LR TypeC 4 1.35±0.20
SLT2A79-LR TypeE 3 1.27±0.20
6. Precaution
(1) Radiation emitted by laser devices can be dangerous to the eyes. Avoid eye or skin exposure to
direct or scattered radiation.
(2) The modules should be handled in the same manner as ordinary semiconductor devices to
prevent the electro-static damages. For safe keeping and carrying, the modules should be
packaged with ESD proof material. To assemble the modules on PCB, the workbench, the
soldering iron and the human body should be grounded.
(3) Please pay special attention to the atmosphere condition because the dew on the module may
cause some electrical damages.
(4) Under such a strong vibration environment as in automobile, the performance and reliability are
not guaranteed.
7. RoHS Compliancy
On January 27, 2003, the European Parliament and the Council of the European Union issued the
directive 2002/95/EC on the restriction of the use of certain hazardous substances in electrical and
electronic equipment (RoHS).
Member States shall ensure that, from July 1, 2006, new electrical and electronic equipment put on
the market does not contain lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls
(PBB) or polybrominated diphenyl ethers (PBDE).
Applications listed in the Annex are exempted.
This product is compliant with RoHS 6/6 directive with exemptions “Lead in glass of cathode ray tubes,
electronic components and fluorescent tubes” and “Lead as an alloying element in steel containing up
to 0.35 % lead by weight, aluminium containing up to 0.4 % lead by weight and as a copper alloy
containing up to 4 % lead by weight”.
Sumitomo Electric Industries, Ltd.
Part No.: SLT2A70-xR Series
Document No.: HUW0424144-01C
Date of issue: December 25, 2007
Page 5 of 7
Pin No. Pin function
for typeE
1 LD anode/PD cathode
(CASE)
2 LD cathode
3 PD anode
Code Fiber-sleeve type Code Pin assignment Pin circle (D1) Pin No. Pin function Pin No. Pin function
L LC 0 Type A φ
1.35±0.20 for typeA for typeC
6 Type C φ
1.35±0.20 1 LD anode (CASE) 1 (CASE)
9 Type E φ
1.27±0.20 2 LD cathode 2 LD cathode
3 PD cathode 3 PD anode
4 PD anode 4 LD anode/PD cathode
Appendix
Part No.: SLT228 - N/
Unit: mm
Tolerance: ±0.1mm, unless otherwise noted.
Pin assignment and pin circle
(Customize code)
Fiber-sleeve type
LC fiber-sleeve
φ4.0
φ3.8
1.0
7.0±0.5
7.0
3.9±0.4
0.7
0.70.70.5 1
2
3
4
Type A
P.C.D D1 (See the table.)
P.C.D φ1.35±0.20
P.C.D φ1.27±0.20
2
3
1
TypeE
1
2
3
4
TypeC
P.C.D φ1.35±0.20
ORP
4.05
φ1.25
φ2.92
3-φ 0.35±0.03
4-φ0.30±0.03
SLT2A7
3.4±0.4
R/
Sumitomo Electric Industries, Ltd.
Part No.: SLT2A70-xR Series
Document No.: HUW0424144-01C
Date of issue: December 25, 2007
Page 6 of 7
8. For More Information
U.S.A.
ExceLight Communications Inc.
4021 Stirrup Creek Drive, Suite 200, Durham NC, 27703
U.S.A.
Tel. (919) 361-1600
Fax. (919) 361-1619
E-mail: info@excelight.com
URL: http://www.excelight.com
Europe
Sumitomo Electric Europe Ltd.
220 Centennial Park, Centennial Avenne, Elstree, Herts, WD6 3SL
United Kingdom
Tel. (020) 8953-8118
Fax. (020) 8207-5950
URL: http://www.sumielectric.com
Japan
Sumitomo Electric Industries, Ltd. (Opto-electronic Products Sales Div.)
3-12, Moto-Akasaka 1-chome, Minato-ku Tokyo, 107-8468
Japan
Tel. (03) 3423-5031
Fax. (03) 3423-5247
E-mail: product_info@ppd.sei.co.jp
URL: http://www.sei.co.jp/Electro-optic/index_e.html
Sumitomo Electric Industries, Ltd.
Part No.: SLT2A70-xR Series
Document No.: HUW0424144-01C
Date of issue: December 25, 2007
Page 7 of 7
Revision Record
Document No. Date of issue Description Incorporated by Checked by Approved by
HUW0424144-01A
Dec./08/04 Preliminary issue. M. Furumai T. Kounosu
Y. Yamasaki M.Yoshimura
HUW0424144-01B
May/15/06 Added RoHS compliancy. Y. Yamasaki
M. Furumai
T. Kounosu M.Yoshimura
HUW0424144-01C
Dec./25/07 Changed RoHS compliancy
expression.
Removed expression
“Preliminary”.
T. Takagi N. Fukushima
Y. Yamasaki
H. Michikoshi
