Fiber Optics JUNE 2001
LO W POWER STL81004x / STL81005x
1550 nm FP Laser
FEATURES
• Designed for applications in fiber optic networks
• Laser Diode with Multi-Quantum W ell structure
• Suitable for bit rates up to 1 Gbit/s
• Ternary Photodiode at rear mirror for monitoring and
control of radiant power
• Hermetically se aled subcomponents, similar to TO 46
• SM pigtail with optional connector
Absolute Maxi mum Ratings
Module
Operating temperature range at case, TC............ –40°C to 85°C
Storage temperature range, Tstg ......................... –40°C to 85°C
Soldering temp erature tmax=10 s,
2 mm distance from bottom edge of case, TS...............260°C
Laser Diode
Direct forward current, IF max.................................... .....120 mA
Radiant power CW, PF, ra d................................................1 mW
Reverse Voltage, VR............................................................... 2 V
Monitor Diode
Reverse Voltage, VR..............................................................10 V
Forward Current, IF............. ...... ..... ...... ...... .........................2 mA
Dimensions in mm STL81005G
Fiber Optics S TL81004/ 5x, Low Powe r 1550nm FP Las er
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DESCRIPTION
Differ en c es between a Fa br y-Perot and a DFB Lase rdiode
A conventional laser consists of an amplifying medium and two
end mirrors. The cavity is longer than one wavele ngth, and a
standing wave is created. The number n of half wavelengths λ
is . If L >> λ then we sp eak of a Fabry-Perot Laser
because the laserdiode emits multi-longitudinal modes. Typi-
cally the laserdiode is 250 µm long. For λ=1310 nm/1550 nm
n is about 350. Therefore for many neighboring wavelengths
the "standing wavelength" condition s pecified above is ful filled.
For a DFB-Laser a special grating acts as a distributed filter
allowing only one of the cavity's longitudinal modes to propa-
gate. This can be described with a reduced oscillator length
which is in the rang e of λ. For such a reduced oscil lator length
the standing wave length condition will be fulfilled for n ≈ 2 what
means for only one wavelength.
Figure 1. Fabry-Perot Lase rd iode
Figure 2. D FB Laserdiode
TECHNICAL DATA
The electro-optical characteristics described in the following
tables are only valid for use within the specified maximum rat-
ings or unde r the recommended operating conditions.
Transmitter Electro-Optical Characteristics
Monitor Diode Electro-Optical Characteristics
Note
1. The tracking error TE is the maximum deviation of PF at constant
current Imon over a specified temperature range and relative to the
reference point: Imon,ref=Imon (T=25°C, PF=0.5 PF, max.). Thus,
TE is given by:
n = 2
x
L
λ
L
~
1
Wavelength
λ
Intensity
0012345
4
Wavelength
λ
Intensity
0012345
4
Parameter Symbol Min. Typ. Max. Units
Optical outpu t power
(maximum) PF, ma x 0.4 mW
Emission wavelength
center of range
PF=0.5 PF, max.
λtrans 1510 1590 nm
Spectral width (RMS) σλ5
Tempera tu re co effi -
cient of wavel ength TC 0.5 nm/K
Threshold current
(whole tempera ture
range)
Ith 245mA
Forward voltage
PF=0.5 PF, max. VF1.5 V
Radiant power at Ith Pth 10 µW
Slope efficienc y
(–40...85°C) η860mW/
A
Variation of 1st deriva-
tive of P/I
(0.1 to 0.4 mW)
Svar –30 30 %
Differential series resis-
tance RS8Ω
Rise time (10%–90%) tr100 200 ps
Fall time (10%–90%) tf270 500
Parameter Symbol Min. Typ. Max. Units
Da rk curr e n t, VR=5 V,
PF=0, T=Tmax IR500 nA
Photocurre nt , VR=5 V,
PF=0.5 PF, max. IP100 1000 µA
Capacitance, VR=5 V,
f=1 MHz C510 pF
Tracking error(1), VR=5 V TE –11dB
[] []
[]
C
T
dBTE c
F
F
x= 25
log10 P
P
o
Fiber Optics S TL81004/ 5x, Low Power 1550nm FP Laser
3
End of Life Time Characteristics
FIBER DATA
The mechanical f iber characteristics are described in the follow-
ing table.
Fiber Characteristics
Pin Description and Flange
Regulatory Compliance
EYE SAFETY
Ensure to avoid exposure of human eyes to high power laser
diode emitted laser beams. Especially do not loo k directly into
the laser diode or the collimated la ser beam when the diode is
activated.
CLASS 3B LASER PRODUCT according to IEC 60825-1
Required Labels
Class IIIb LASER PRODUCT according to FDA Regulations
complies with 21 CFR 1040.10 and 1040.11
Required Label
Laser Data
CONNECTOR OPTIONS
Parameter Symbol Min. Typ. Max. Units
Threshold cu r rent at
T=Tmax Ith 60 mA
Current above thresh-
old, over full tempera-
ture range, at
Imon,ref=Imon (T=25°C,
PF=0.5 PF, max., BOL)
∆IF770
Tracking Error TE –1.5 1.5 dB
Mon ito r D ark C urr e n t,
VR=2 V, T=Tmax IR1µA
Parameter Min. Typ. Max. Units
Mode Field Diameter 8 9 10 µm
Cladding Diameter 123 125 127
Mode Field/Cladding Concentricity
Error 1
Cladding Non-circularity 2 %
Mode Field Non-circularity 6
Cut off Wave le ngt h 12 70 nm
Jacket Diam et er 0.8 1 mm
Bending Radius 30
Tensile Streng th Fibe r Case 5 N
Length 0.8 1.2 m
Pinning (bottom view) Pin Description
Transmitter
Available Pinnings with and without Flange
Type Transmitter Flange
STL81004x 1 without
STL81005x 1 with
Feature Standard Comments
Electrostatic
Discharge (ESD) to
the Electrical Pins
MIL-S TD 883D
Method 3015.7 Class 1 (<500 V)
12
3
4
2.54 mm
1
4
2
3
MD
LD
Pinning 1
Wave len gt h 1550 nm
Maximum total output power less than 50 mW
Beam divergence (1/e2)10°
Model Connector Type
STL81004G
STL81005G SM FC/PC
STL81004N
STL81005N SM SC/PC 0°
STL81004Z
STL81005Z without
connector
INVISIBLE LASER RADIATION
AVOID EXPOSURE TO BEAM
Class 3B Laser Product
SEMICONDUCTOR LASER
INVISIBLE RADIATION
CLASS IIIb LASER PRODUCT
LASER RADIATION - AVOID
DIRECT EXPOSURE TO BEAM
Published by Infineon Technologies AG
© Infineon Technologies AG 2001
All Rights Reserved
Attention please!
The information herein is given to describe certain components and shall not be
considered as warranted characteristics.
Terms of delivery and rights to technical change reserved.
W e hereb y disclaim any and all warranties, including but not limited to w arranties
of non-infrin gem ent , regarding circuits, descri ptions and charts stated herein.
Infineon Technologies is an approved CECC manufacturer.
Information
For further information on technology, delivery terms and conditions and prices
please contact the Infineon Technologies offices or our Infineon Technologies
Representatives worldwide - see our webpage at
www.infineon.com/fiberoptics
Warnings
Due to technical requirements components may contain dangerous substances.
F or information on the types in question please contact your Infineon T echnologies
offices.
Infineon Technologies Components may only be used in life-support devices or
systems with the express written approval of Infineon Technologies, if a failure of
such components can reasonably be expected to cause the failure of that
life-support device or system, or to aff ect the saf ety or ef fectiveness of that device
or system. Life support devices or systems are intended to be implanted in the
human body, or to support and/or maintain and sustain and/or protect human life.
If they fail, it is reasonable to assume that the health of the user or other persons
may be endangered.
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Infineon Technologies, Inc. • Fiber Optics • 1730 North First Street • San Jose, CA 95112, USA
Infineon Technologies K.K. • Fiber Optics • Takanawa Park Tower • 20-14, Higashi-Gotanda, 3-chome, Shinagawa-ku • Tokyo 141, Japan
