Document Outline
- Features
- Applications
- Benefits
- Description
- Absolute Maximum Ratings
- Handling Precautions
- Electro/Optical Characteristics
- Analog Operation
- Outline Diagram
- Qualification Information
- Laser Safety Information
- Ordering Information
- List of Figures
- Figure 1. A371-Type Analog Uncooled Isolated DFB Laser Module Schematic, Top View
- List of Tables
- Table 1. Pin Descriptions
- Table 2. Electro/Optical Characteristics
- Table 3. Analog Characteristics
- Table 4. A371-Type Laser Module Qualification Test Plan
- Table 5. Ordering Information
- Contact Us
Data Sheet
January 1999
A371-Type Analog Uncooled Isolated
DFB
FastLight
TM
Laser Module
The low-profile A371-Type Analog Laser Module is ideally
suited for CATV applications, particularly in systems where
long spans and superior reliability are the critical consider-
ations.
Features
s
Eight-pin package suitable for CATV applications
s
Narrow linewidth, distributed-feedback,
multiquantum-well (DFB-MQW)1.3
m laser with
single-mode fiber pigtail
s
Wide operating temperature range:
40
C to +85
C
s
Frequency range up to 1.0 GHz
s
No thermoelectric cooler required
s
Single- and double-isolated versions available
s
High output power: typically 2.0 mW peak power
coupled into single-mode fiber
s
Hermetically sealed active components
s
Internal back-facet monitor
s
Qualification program: Bellcore TA-983
Applications
s
Video and data applications
s
Downstream telephony and data
s
Return path systems
s
Mixed analog and digital modulation
s
Telecommunications
Benefits
s
Easily board mounted
s
Requires no lead bending
s
No additional heat sinks required
s
Pin compatible with industry-standard, 14-pin laser
module
s
Highly efficient DFB-MQW laser structure allows
for lower threshold and drive currents, and reduced
power consumption
s
High output power allows for longer system spans,
more fiber splits, and greater tolerance of fiber and
connector quality
s
Internal isolator minimizes spurious noise
A371-Type Analog Uncooled Isolated
Data Sheet
DFB
FastLight
Laser Module
January 1999
2
2
Lucent Technologies Inc.
Description
The A371-Type Uncooled Isolated Laser Module con-
sists of a laser diode coupled to a single-mode fiber
pigtail. The device is available in a standard, 8-pin con-
figuration (see Figure 1 and/or Table 1) and is ideal for
CATV applications.
The module includes a narrow linewidth (<1 nm), DFB-
MQW, single-mode laser and an InGaAs PIN photo-
diode back-facet monitor in a hermetically sealed pack-
age.
The device characteristics listed in this document are
met at 2.0 mW output power. Higher- or lower-power
operation is possible. Under conditions of a fixed pho-
todiode current, the change in optical output is typically
0.5 dB over an operating temperature range of 40
C
to +85
C.
This device incorporates the new Laser 2000 manufac-
turing process from the Optoelectronics unit of Lucent
Technologies Microelectronics Group. Laser 2000 is a
low-cost platform that targets high-volume manufactur-
ing and tight product distributions on all optical subas-
semblies. This platform incorporates an advanced
optical design that is produced on Opto's highly auto-
mated production lines. The Laser 2000 platform is
qualified for central office and uncontrolled environ-
ments, and can be used for applications requiring high
performance and low cost.
Figure 1. A371-Type Analog Uncooled Isolated DFB
Laser Module Schematic, Top View
Table 1. Pin Descriptions
Pin Number
Connection
1
NC
2
Case ground
3
NC
4
Photodiode cathode
5
Photodiode anode
6
Laser diode cathode
7
Laser diode anode
8
NC
5
6
8
7
4
3
1
2
1-900 (C)
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
* Rating varies with temperature.
Parameter
Symbol
Min
Max
Unit
Maximum Peak Laser Drive Current or
Maximum Fiber Power*
I
OP
P
MAX
--
--
150
10
mA
mW
Peak Reverse Laser Voltage:
Laser
Monitor
V
RL
V
RD
--
--
2
20
V
V
Monitor Forward Current
I
FD
--
2
mA
Operating Case Temperature Range
T
C
40
85
C
Storage Case Temperature Range
T
stg
40
85
C
Lead Soldering Temperature/Time
--
--
260/10
C/s
Relative Humidity (noncondensing)
RH
--
85
%
Data Sheet
A371-Type Analog Uncooled Isolated
January 1999
DFB
FastLight
Laser Module
3
Lucent Technologies Inc.
Handling Precautions
Caution: This device is susceptible to damage as a result of electrostatic discharge (ESD). Take proper
precautions during both handling and testing. Follow guidelines such as JEDEC Publication No.
108-A (Dec. 1988).
Although protection circuitry is designed into the device, take proper precautions to avoid exposure to ESD.
Electro/Optical Characteristics
* See Table 5 for more information.
V
R
= reverse voltage.
Table 2. Electro/Optical Characteristics
(over operating temperature range unless otherwise noted)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Operating Temperature
Range
T
--
40
--
85
C
Optical Output Power*
P
F
CW, nominal
--
2
--
mW
Threshold Current
I
TH
T = 25
C
T = full range
5
2
11
--
15
50
mA
mA
Drive Current Above
Threshold
I
MOD
CW, P
F
= 2.0 mW, T = 25
C
CW, I
MON
= const., T = full range
10
7.5
20
--
30
55
mA
Slope Efficiency
SE
CW, P
F
= 2.0 mW, T = 25
C
67
--
200
W/mA
Center Wavelength
C
P
F
= 2.0 mW, CW
1280
--
1335
nm
Spectral Width (20 dB)
P
F
= 2.0 mW
--
--
1
nm
Side-mode Suppression
Ratio
SMSR
CW, P
F
= 2.0 mW
30
40
--
dB
Tracking Error
TE
I
MON
= constant, CW
--
0.5
1.25
dB
Forward Voltage
V
F
CW
--
1.1
1.6
V
Input Impedance
R
--
3
--
8
Monitor Current
I
MON
V
R
= 5 V
100
--
1000
A
Monitor Dark Current
I
D
V
R
= 5 V
--
10
200
nA
Wavelength Temperature
Coefficient
--
--
--
0.09
0.1
nm/
C
A371-Type Analog Uncooled Isolated
Data Sheet
DFB
FastLight
Laser Module
January 1999
4
Lucent Technologies Inc.
Electro/Optical Characteristics
(continued)
Analog Operation
The A371-Type Laser Module has the capability of being used in a wide variety of analog operations. These may
include several channels of pure video signals, or a mix of video signals with digital data channels riding on analog
carriers. It is difficult to prepare a single battery of testing conditions that will satisfy all applications. The following
table contains a set of testing conditions that Lucent believes will give a broad indication of the performance of the
A371 Series Laser Module. Please contact your local Field Application Engineer if different testing conditions and
parametric limits are required.
The distortion characteristics are measured using a two-tone test. The frequencies are 13 MHz and 19 MHz. The
second-order distortion components are measured at f1 + f2 = 32 MHz and f1 f2 = 6 MHz. All third-order distor-
tion components are measured in the frequency range of 5 MHz--200 MHz, and they meet the required level. All
measurements are made with SC-SPC connectors on the laser module pigtails.
* See Table 5 for more information.
Double-isolated version.
Low-performance option.
Single- and double-isolated versions.
Table 3. Analog Characteristics
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Output Power*
P
O
CW, T = 40
C to +85
C
--
2.0
--
mW
Relative Intensity Noise
RIN
CW, P
F
= 2.0 mW,
Freq. = 5 MHz to 300 MHz;
no fiber loss, T = 40
C to +85
C
--
155
145
dB/Hz
Modulation Bandwidth
BW
3 dB, P
F
= 2.0 mW,
T = 40
C to +85
C
1.0
--
--
GHz
Second-order Distortions
--
T = 25
C, P
F
= 2.0 mW, OMI = 0.2;
Two-tone test: f1 = 13 MHz,
f2 = 19 MHz; 20 km of fiber,
(7 dB loss) plus connector loss,
f1
f2
--
54
58
46
50
54
42
dBc
dBc
dBc
Third-order Distortions
--
T = 25
C, P
F
= 2.0 mW, OMI = 0.2;
Two-tone test: f1 = 13 MHz,
f2 = 19 MHz; 20 km of fiber
(7 dB loss), plus connector loss,
all peaks from 5 MHz--50 MHz
meet this level
--
70
75
69
63
68
61
dBc
dBc
dBc
Spurious Noise
N
SP
T = 25
C, P
F
= 2.0 mW, OMI = 0.2;
ref. to one-tone: 5 MHz to 50 MHz,
20 km of fiber, (7 dB loss) plus
connector loss
--
63
61
60
58
dBc
dBc
Spurious Noise (carrier off)
N'
SP
T = 25
C, P
F
= 2.0 mW
--
50
54
45
45
50
40
dBc
dBc
dBc
RF Bandpass Flatness
B
P
F
Peak to valley, 5 MHz to 200 MHz
--
--
1.0
dB
Data Sheet
A371-Type Analog Uncooled Isolated
January 1999
DFB
FastLight Laser Module
5
Lucent Technologies Inc.
Outline Diagram
Dimensions are in inches (and millimeters).
0.010
(0.254)
0.30
(7.62)
0.29
(7.37)
0.085
(2.16)
0.17
(4.32)
0.20 (5.00)
0.165 (4.20)
0.016 (0.410)
0.100 (2.54)
0.300
(7.62)
0.110 (2.79)
0.045 (1.143)
4
3
2
1
5
6
7
8
39.37 (1000) MIN
PIGTAIL LENGTH
0.52 (13.2)
1.06 (27.0)
MIN
TRADEMARK, CODE, LASER SERIAL NUMBER,
AND/OR DATE CODE IN APPROXIMATE AREA SHOWN
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