155/622 Mb/s SMQW Pigtailed
Laser Modules
Technical Data
LST2525 - 200 µW Coaxial Laser
LST2825 - 1 mW Coaxial Laser
Features
• Strained Multi Quantum
Well (SMQW) Fabry Perot
laser chip
• Low threshold and
operating current
• Wide Operating
Temperature Range
• Optical Power up to 1 mW
• Modulation Capability up to
622 Mb/s
Description
Products in the SMQW pigtailed
laser module family consist of a
coaxial style package 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 Fabry Perot
laser diode and rear facet monitor
photodiode. 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.
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/lntra Office
SONET/SDH
Datacommunications
Switches
Laser Safety Warning
This device is a Class IIIa (3a) 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.
2
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause catastrophic damage to the device. Limits apply to each parameter in isolation,
all other parameters having values within the recommended operating conditions. It should not be assumed that limiting values of more than one
parameter can be applied to the product at the same time. Exposure to the absolute maximum ratings for extended periods can adversely affect
device reliability.
Parameter
Laser Forward Current
Laser Reverse Voltage
Photodiode Reverse Voltage
Photodiode Forward Current
Operating Temperature
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
Limits
Min. Max.
120
2
20
1
+85
+85
10
500
20
Unit
mA
V
V
mA
°C
°C
%RH
N
G
G
-40
-40
noncondensing
Three times; 10 sec.
MIL-STD-883E, Method 2002, Condition A
MIL-STD-883E, Method 2007, Condition A
Performance Specifications
Parameter
LASER
Symbol
Test Condition
CW, Tc = -40°C to +85°C,
Po as noted below
unless otherwise stated
Tc = ranges specified
above, CW
Tc = +25°C
If = Ith - 2 mA
Tc = +25°C
Tc = +25°C
Tc = -40°C to +85°C
Vf
10
12.5
10
LST2525
Min.
Max.
LST2825
Min.
Max.
Unit
Rated optical power
Threshold current
Threshold current
Coupled Power in "Off"
state
Slope efficiency
Drive current above Ith,
for Im = Im (Po, +25°C)
Forward voltage - LST
Forward voltage
- HFCT
Centre wavelength
Wavelength/temperature
coefficient
Spectral width
Rise and fall time
Po
Ith
Ith
Pth
0.2
3.5
1.5
10
30
12
16
20
33.3
1.6
3.0
1336
1360
0.4
2.5
380
1
3.5
1.5
10
30
12
100
20
33.3
1.6
3.0
1336
1360
0.4
2.5
380
mW
mA
mA
µW
µW/mA
mA
mA
V
V
nm
nm
nm/°C
nm
ps
h
Id
50
10
7.5
l
Dl
/
D
T
s
t
Tc = +25°C
Tc = -40°C to +85°C
1286
1260
1286
1260
One sigma, RMS
10 - 90%, Ith to Po
3
Performance Specifications (Continued)
Parameter
MONITOR
PHOTODIODE
Photocurrent
Dark current
Capacitance - LST
Capacitance
- HFCT
Tracking Error
Rise and fall time
Symbol
Test Condition
Tc = +25°C Vr = 5 V,
Po = Rated Power
Im
Id
C
200
Po = 0 µW
1 MHz
Im = Im (Po, +25°C) Tc +
-40°C to +85°C
10 - 90%, Ith to Po
1000
20
10
20
±1
2
200
1000
20
10
20
±1
2
µA
nA
pF
pF
dB
ns
LST2525
Min.
Max.
LST2825
Min.
Max.
Unit
D
R
t
r
Fiber Pigtail
Parameter
Fiber Pigtail Length
Spot Size (Mode Radius)
Cladding Diameter
Core/Cladding Concentricity
Secondary Jacket Diameter
Effective Cutoff Wavelength
Minimum
1000
4.5
122
0.8
1150
Maximum
5.5
128
1
1
1240
Unit
mm
µm
µm
µm
mm
nm
Reliability
Parameter
Median Life
Condition
50% inc. in total drive current, Tc = +25°C
Minimum
2 x 10^5
Maximum
Unit
hours
Other documentation
SMQW Laser Diode Reliability Datasheet
LST252X/LST282X Qualification Report
Publication number 5965-1293E
Publication number 5965-8894E
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