Coaxial Pigtailed Laser Module
Preliminary Technical Data
LST2425X, LST3421X
Features
• Compact Coaxial Package
• Strained Multi Quantum
Well Distributed Feedback
(DFB) Laser Chip
• Low Thresholds Current and
Operating Currents
• Wide Operating Tempera-
ture -40
°
C to +85
°
C
• Excellent Wavelength
Stability with Temperature
~0.1 nm/
°
C
• Narrow Line Width
<1 nm @ -20 dB
• Side Mode Suppression
Ratio >-30 dB
• Modulation Capability up to
622 Mb/s
• Convenient Variety of
Pinout and Mounting Flange
Options
• SONET/SDH
• Datacommunications
• Switches
Description
Products in the LST242X family
are compact coaxial pigtailed
DFB laser transmitters, operating
in the 1300 nm wavelength
region and coupling light to
single mode fiber. They are
designed for use in short,
medium and long distance
networks with bit rates up to
622 Mb/s.
The device features a high
reliability SMQW-DFB laser diode
and rear facet monitor photo-
diode. These are electrically
connected to four pins in an
industry-standard configuration.
Environmental performance is
designed to be compatible with
the requirements of Bellcore’s
TA-NWT-000983 document.
Options within the LST242X
family offer pinouts and pin
rotational orientations designed
to match existing products
available on the market. We also
offer a comprehensive range of
alternative mounting flanges
including a dual in line option.
If the specific arrangement or
performance you require is not
listed, please contact your local
representative as our highly
flexible design and manufacturing
processes allow both physical and
electro-optical customization to
meet your needs.
Applications
• Telecommunications
• Fiber in the Loop
• Inter/Intra Office
Preliminary Product Disclaimer
This preliminary data sheet is provided to assist you in the evaluation of engineering samples of the product which is under development
and targeted for release during 1997. Until Hewlett-Packard releases this product for general sales, HP reserves the right to alter prices,
specifications, features, capabilities, function, manufacturing release dates, and even general availability of the product at any time.
Laser Safety Warning
This device is a Class IIIb (3b) Laser Product. It may emit invisible laser radiation if operated with the fiber pigtail disconnected. To avoid
possible eye damage do not look into an unconnected fiber pigtail during laser operation. Do not exceed specified operating limits.
514
(5/97)
Absolute Maximum Ratings
Absolute limiting (maximum) ratings mean that no catastrophic damage will occur if the product is subjected to these ratings for short periods,
provided that each limiting parameter is in isolation and all other parameters have values within the performance specification. It should not be
assumed that limiting values of more than one parameter can be applied to the product at the same time.
Parameter
Laser Forward Current
Laser Reverse Voltage
Photodiode Reverse Voltage
Photodiode Forward Current
Operating Temperature
A
B
Storage Temperature
Relative Humidity
Fiber Pull Strength
Mechanical Shock
Vibration
Symbol
If
Vlr
Vr
Ipf
Tc
Ts
RH
Test Condition
DC
DC
DC
DC
Temperature measured at case
Three times; 10 sec.
MIL-STD-883D, Method 2002,
Condition A
MIL-STD-883D, Method 2007,
Condition A
Limits
Min.
Max.
120
2
20
1
–40
+85
0
+70
–40
+85
noncondensing
10
500
20
Units
mA
V
V
mA
°C
°C
°C
%RH
N
G
G
Performance Specifications
LST242X
LST3421
Min.
Max.
Parameter
LASER
Symbol
Rated Optical Power
Threshold Current
Threshold Current
Coupled Power in “Off” State
Drive Current above Ith,
for Im = Im (Po, +25°C)
Forward Voltage
Center Wavelength
Wavelength/Temperature
Coefficient
Spectral Width
Side Mode Suppression Ratio
Rise and Fall Time
MONITOR PHOTODIODE
Photocurrent
Dark Current
Capacitance
Tracking Error
Po
Ith
Ith
Pth
Id
Vf
λ
∆λ/∆T
σ
SMSR
τ
Test Condition
CW, over operating temperature
range, Po, as noted below unless
otherwise stated and –20 dB ORL
Tc = ranges specified above, CW
Tc = +25°C
Over operating temperature range
If = Ith – 2 mA
Tc = +25°C
Over operating temperature range
Over operating temperature range
Units
2
4
2
0
12.5
-
1280
15
40
10
25
40
1.6
1335
0.1
1
mW
mA
mA
µW
mA
mA
V
nm
nm/°C
nm
dB
ns
At –20 dB
+30
10-90%, Ith to Po
Tc = +25°C, Vr = 5 V,
Po = Rated Power
50
Po = 0
µW
1 MHz
Im = Im (Po, +25°C)
Tc + –40°C to + 85°C
0.5
Im
Id
C
∆R
–1
1000
20
10
1
µA
nA
pF
dB
515
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