Coaxial Pigtailed Laser Module
Technical Data
LST252X - 200
µ
W Coaxial Laser
LST282X - 1 mW Coaxial Laser
LST292X - 1.6 mW Coaxial Laser
LST3X21 - Dual-in-Line Package
Features
• Compact Coaxial Package
• Strained Multi Quantum
Well (SMQW) Laser Chip
• Low Thresholds Current and
Operating Currents
• Wide Operating Tempera-
ture -40
°
C to +85
°
C
• Optical Power May Be
Customized up to 2 mW
• Modulation Capability up to
622 Mb/s
• Convenient Variety of
Pinout and Mounting Flange
Options
Description
Products in the LST2X2X family
are compact coaxial pigtailed
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 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.
Options within the LST2X2X
family offer pinouts and pin
rotational orientations designed
to match existing products
Applications
•
•
•
•
•
•
Telecommunications
Fiber in the Loop
Inter/Intra Office
SONET/SDH
Datacommunications
Switches
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.
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.
520
5965-7336E (4/97)
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
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
–40
+85
noncondensing
10
500
20
Units
mA
V
V
mA
°C
°C
%RH
N
G
G
Performance Specifications
LST252X LST282X LST292X
LST3521
LST3821
LST3921
Min. Max. Min. Max. Min. Max. Units
Parameter
LASER
Symbol
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
Center Wavelength
Wavelength/
Temperature
Coefficient
Spectral Width
Rise and Fall Time
Po
Ith
Ith
Pth
η
Id
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
0.2
3.5
1.5
10
30
10
16
20
33.3
1.0
3.5
1.5
10
30
10
80
20
33.3
1.6
3.5
1
10
30
10
mW
mA
mA
µW
10
12.5
10
50
12.5
10
80
12.5
10
128
µW/mA
20
33.3
mW
mA
Vf
λ
∆λ/∆T
σ
τ
Tc = +25°C
Tc = –40°C to +85°C
1.6
1.6
1.6
V
1286 1336 1286 1336 1286 1336 nm
1260 1360 1260 1360 1260 1360 nm
0.4
0.4
0.4 nm/°C
One sigma, RMS
10-90%, Ith to Po
2.5
0.5
2.5
0.5
2.5
0.5
nm
ns
521
Performance Specifications (continued)
LST252X LST282X LST292X
LST3521
LST3821
LST3921
Min. Max. Min. Max. Min. Max. Units
Parameter
MONITOR
PHOTODIODE
Photocurrent
Dark Current
Capacitance
Tracking Error
Rise and Fall Time
Symbol
Test Condition
Tc = +25°C, Vr = 5 V,
Po = Rated Power
Po = 0
µW
1 MHz
Im = Im (Po, +25°C)
Tc + –40°C to + 85°C
10-90%, Ith to Po
Im
Id
C
DR
tr
200 1000
20
10
–1
+1
2
200
–1
1000
20
10
+1
2
200
–1
1000
20
10
+1
-
µA
nA
pF
dB
ns
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
Units
mm
µm
µm
µm
mm
nm
Reliability Target
Parameter
Median Life
Condition
50% inc. in total drive current, Tc = +25°C
Min.
2x10
5
Max.
Units
hours
Other Documentation
SMQW Laser Diode Reliability Datasheet
LST282X/LST292X/LST3821/LST3921
Interim Qualification Report
Publication number 5965-1293E
Publication number 5965-5374E
522
LST3X21 Specification
– All dimensions in mm.
D
M
4
3
A
B
C
2
1
5
6
C/L
7
8
J
K
PIN 1 INDICATOR
F
E
G
H
I
CASE
4
PHOTODIODE
PIN
5
LASER
FUNCTION
NO CONNECTION
MONITOR ANODE (-VE)
MONITOR CATHODE (+VE)
NO CONNECTION
NO CONNECTION
LASER CATHODE (-VE)
LASER ANODE (+VE)
(CONNECTED TO HEADER)
NO CONNECTION
1
2
3
4
5
6
7
8
3
2
1
6
7
8
OPTION 1
DIM.
A
B
C
D
TYP.
12.60
7.62
2.54
30.00
DIM.
E
F
G
H
TYP.
10.20
12.60
4.26
3.53
DIM.
I
J
K
M
TYP.
2.54
8.60
3.20
1000
NOTE:
PINS 1, 4, 5, AND 8 ARE ISOLATED
FROM THE INTERNAL CIRCUITRY,
BUT ARE ELECTRICALLY CONNECTED
TO EACH OTHER.
PINS 1, 4, 5, & 8 – 0.51 x 0.38 NOM.
PINS 2, 3, 6, & 7 – 0.4/0.5 DIA.
524
ADI Reference Circuit
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