Analog Coaxial Pigtailed
Laser Module
Technical Data
LSA2825 - Analog
Coaxial Laser
LSA3821 - 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
• Convenient Variety of
Pinout and Mounting Flange
Options
Description
The LSAX82X is a compact
analog coaxial pigtailed laser
transmitter, operating in the
1300 nm wavelength region and
coupling light to single mode
fiber.
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.
Applications
• CATV/CCTV
• Return Path Links
• LANS/WANS
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.
526
5965-7337E (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
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
LSA2825
LSA3821
Min.
Max.
Parameter
LASER
Symbol
Rated Optical Power
Threshold Current
Threshold Current
Slope Efficiency
Drive Current above Ith,
for Im = Im (Po, +25°C)
Forward Voltage
Center Wavelength
Wavelength/Temperature
Coefficient
Spectral Width
MONITOR PHOTODIODE
Photocurrent
Dark Current
Capacitance
Tracking Error
Po
Ith
Ith
η
Id
Vf
λ
∆λ/∆T
σ
Im
Id
C
DP
Test Condition
CW, Tc = –40°C to +85°C, Po as
noted below unless otherwise
stated
CW
Tc = +25°C
Tc = +25°C
Tc = +25°C
Tc = –40°C to +85°C
Tc = +25°C
Tc = –40°C to +85°C
Units
1.0
3.5
1
30
12.5
10
1286
1260
10
30
80
33.3
55
1.6
1336
1360
0.4
2.5
mW
mA
mA
µW/mA
mA
mA
V
nm
nm
nm/°C
nm
µA
nA
pF
dB
One sigma, RMS
Tc = +25°C, Vr = 5 V
200
Po = 0
µW
1 MHz
Im = Im (Po, +25°C)
Tc + –40°C to + 85°C
–1
1000
20
10
+1
527
Other Documentation
1. SMQW Laser Reliability Report – Publication Number 5965-1293E
2. LST282X/292X Characterization Report – Publication Number 5965-5374E
Analog Specifications
Parameter
Relative Intensity
Noise (RIN)
2nd Order Distortion
Symbol
RIN
-
Test Conditions
Po = 1 mW, Tc = –40°C to +85°C
Tc = +25°C, Po = 1 mW, OMD = 35%
Two tone test: F
1
= 13 MHz, F
2
= 19 MHz,
20 km fiber, Total loss = 9 dB, F
1
±
F
2
Tc = +25°C, Po = 1 mW, OMD = 35%
Two tone test: F
1
= 13 MHz, F
2
= 19 MHz,
20 km fiber, Total loss = 9 dB,
2F
1
±
F
2
, 2F
2
±
F
1
Min.
Max.
–135
–43
Unit
dB/Hz
dBc
3rd Order Distortion
-
–50
dBc
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
528
Example of LSA2825-T
– All dimensions in mm.
A
I
K
H
G
B
C
O
F
M
N
L
Q
D
P – PIN DIAMETER
J
R
E
DIM.
A
B
C
D
E
F
MIN.
TYP.
7.4
17.0
MAX.
DIM.
G
H
I
J
K
L
MIN.
12.0
TYP.
DIM.
M
N
O
P
Q
R
MIN.
TYP.
0.9
5.3
2.0
MAX.
11.8
3.7
2.4
12.5
12.2
2.6
12.9
5.3
2.0
2.1
1000
0.4
0.5
1.25
0.5
OTHER FLANGE OPTIONS ARE AVAILABLE.
PINOUT
LST2825
CASE 4
LASER
1
PHOTODIODE
PIN
1
2
3
4
FUNCTION
MONITOR ANODE (-VE)
MONITOR CATHODE (+VE)
LASER CATHODE (-VE)
LASER ANODE (+VE)
3
2
529
LSA3821 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
3
2
1
PIN
5
LASER
6
7
8
OPTION 1
1
2
3
4
5
6
7
8
FUNCTION
NO CONNECTION
MONITOR ANODE (-VE)
MONITOR CATHODE (+VE)
NO CONNECTION
NO CONNECTION
LASER CATHODE (-VE)
LASER ANODE (+VE)
(CONNECTED TO HEADER)
NO CONNECTION
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.
ALL DIMENSIONS IN MILLIMETERS
530
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