Document Outline
- Features
- Applications
- Description
- Absolute Maximum Ratings
- Performance Specifications
- Other Documentation
- Analog Specifications
- Fiber Pigtail
- Reliability Target
- Example of LSA2825-T All dimensions in mm.
- LSA3821 Specification All dimensions in mm.
- Ordering Information
- Laser Warning
- CDRH Certification
526
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
Applications
CATV/CCTV
Return Path Links
LANS/WANS
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.
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.
5965-7337E (5/97)
527
Limits
Parameter
Symbol
Test Condition
Min.
Max.
Units
Laser Forward Current
If
DC
120
mA
Laser Reverse Voltage
Vlr
DC
2
V
Photodiode Reverse Voltage
Vr
DC
20
V
Photodiode Forward Current
Ipf
DC
1
mA
Operating Temperature
Tc
Temperature measured at case
40
+85
C
Storage Temperature
Ts
40
+85
C
Relative Humidity
RH
noncondensing
%RH
Fiber Pull Strength
Three times; 10 sec.
10
N
Mechanical Shock
MIL-STD-883D, Method 2002,
500
G
Condition A
Vibration
MIL-STD-883D, Method 2007,
20
G
Condition A
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.
Performance Specifications
LSA2825
LSA3821
Parameter
Symbol
Test Condition
Min.
Max.
Units
LASER
CW, Tc = 40
C to +85
C, Po as
noted below unless otherwise
stated
Rated Optical Power
Po
CW
1.0
mW
Threshold Current
Ith
Tc = +25
C
3.5
10
mA
Threshold Current
Ith
1
30
mA
Slope Efficiency
Tc = +25
C
30
80
W/mA
Drive Current above Ith,
Id
Tc = +25
C
12.5
33.3
mA
Tc = 40
C to +85
C
10
55
mA
Forward Voltage
Vf
1.6
V
Center Wavelength
Tc = +25
C
1286
1336
nm
Tc = 40
C to +85
C
1260
1360
nm
Wavelength/Temperature
/
T
0.4
nm/
C
Coefficient
Spectral Width
One sigma, RMS
2.5
nm
MONITOR PHOTODIODE
Tc = +25
C, Vr = 5 V
Photocurrent
Im
200
1000
A
Dark Current
Id
Po = 0
W
20
nA
Capacitance
C
1 MHz
10
pF
Tracking Error
DP
Im = Im (Po, +25
C)
1
+1
dB
Tc + 40
C to + 85
C
for Im = Im (Po, +25
C)
528
Fiber Pigtail
Parameter
Minimum
Maximum
Units
Fiber Pigtail Length
1000
mm
Spot Size (Mode Radius)
4.5
5.5
m
Cladding Diameter
122
128
m
Core/Cladding Concentricity
1
m
Secondary Jacket Diameter
0.8
1
mm
Effective Cutoff Wavelength
1150
1240
nm
Reliability Target
Parameter
Condition
Min.
Max.
Units
Median Life
50% inc. in total drive current, Tc = +25
C
2x10
5
hours
Other Documentation
1. SMQW Laser Reliability Report Publication Number 5965-1293E
2. LST282X/292X Characterization Report Publication Number 5965-5374E
Analog Specifications
Parameter
Symbol
Test Conditions
Min.
Max.
Unit
Relative Intensity
RIN
Po = 1 mW, Tc = 40
C to +85
C
135
dB/Hz
Noise (RIN)
2nd Order Distortion
-
Tc = +25
C, Po = 1 mW, OMD = 35%
43
dBc
Two tone test: F
1
= 13 MHz, F
2
= 19 MHz,
20 km fiber, Total loss = 9 dB, F
1
F
2
3rd Order Distortion
-
Tc = +25
C, Po = 1 mW, OMD = 35%
50
dBc
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
529
H
N
I
L
M
F
K
G
P PIN DIAMETER
R
J
Q
B
C
O
A
D
OTHER FLANGE OPTIONS ARE AVAILABLE.
MIN.
TYP.
MAX.
11.8
2.4
12.5
7.4
17.0
3.7
12.2
2.6
12.9
A
B
C
D
E
F
MIN.
TYP.
12.0
2.1
5.3
2.0
1000
G
H
I
J
K
L
DIM.
DIM.
MIN.
TYP.
MAX.
0.4
0.9
5.3
2.0
0.5
1.25
0.5
M
N
O
P
Q
R
DIM.
E
Example of LSA2825-T
All dimensions in mm.
FUNCTION
MONITOR ANODE (-VE)
MONITOR CATHODE (+VE)
LASER CATHODE (-VE)
LASER ANODE (+VE)
1
2
3
4
PIN
4
1
3
2
CASE
LASER
LST2825
PHOTODIODE
PINOUT
530
A
B
C
D
H
TYP.
12.60
7.62
2.54
30.00
A
B
C
D
DIM.
4
3
2
1
5
6
7
8
C/L
E
PIN 1 INDICATOR
F
I
G
4
3
2
1
5
6
7
8
PHOTODIODE
LASER
CASE
FUNCTION
NO CONNECTION
MONITOR ANODE (-VE)
MONITOR CATHODE (+VE)
NO CONNECTION
NO CONNECTION
LASER CATHODE (-VE)
LASER ANODE (+VE)
1
2
3
4
5
6
7
PIN
(CONNECTED TO HEADER)
NO CONNECTION
8
TYP.
10.20
12.60
4.26
3.53
E
F
G
H
DIM.
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
K
J
TYP.
2.54
8.60
3.20
I
J
K
DIM.
OPTION 1
M
1000
M
LSA3821 Specification
All dimensions in mm.
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