Data Sheet
January 1999
A371-Type Analog Uncooled Isolated
DFB
FastLight
™
Laser Module
s
s
s
No thermoelectric cooler required
Single- and double-isolated versions available
High output power: typically 2.0 mW peak power
coupled into single-mode fiber
Hermetically sealed active components
Internal back-facet monitor
Qualification program: Bellcore TA-983
s
s
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Applications
s
s
s
s
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Video and data applications
Downstream telephony and data
Return path systems
Mixed analog and digital modulation
Telecommunications
Benefits
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Easily board mounted
Requires no lead bending
No additional heat sinks required
Pin compatible with industry-standard, 14-pin laser
module
Highly efficient DFB-MQW laser structure allows
for lower threshold and drive currents, and reduced
power consumption
High output power allows for longer system spans,
more fiber splits, and greater tolerance of fiber and
connector quality
Internal isolator minimizes spurious noise
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.
s
s
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Features
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Eight-pin package suitable for CATV applications
Narrow linewidth, distributed-feedback,
multiquantum-well (DFB-MQW)1.3
µ
m laser with
single-mode fiber pigtail
Wide operating temperature range:
–40
°
C to +85
°
C
Frequency range up to 1.0 GHz
s
s
s
s
A371-Type Analog Uncooled Isolated
DFB
FastLight
Laser Module
Data Sheet
January 1999
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.
4
3
2
1
5
6
7
8
1-900 (C)
Figure 1. A371-Type Analog Uncooled Isolated DFB
Laser Module Schematic, Top View
Table 1. Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
Connection
NC
Case ground
NC
Photodiode cathode
Photodiode anode
Laser diode cathode
Laser diode anode
NC
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.
Parameter
Maximum Peak Laser Drive Current or
Maximum Fiber Power*
Peak Reverse Laser Voltage:
Laser
Monitor
Monitor Forward Current
Operating Case Temperature Range
Storage Case Temperature Range
Lead Soldering Temperature/Time
Relative Humidity (noncondensing)
* Rating varies with temperature.
Symbol
I
OP
P
MAX
V
RL
V
RD
I
FD
T
C
T
stg
—
RH
Min
—
—
—
—
—
–40
–40
—
—
Max
150
10
2
20
2
85
85
260/10
85
Unit
mA
mW
V
V
mA
°
C
°
C
°
C/s
%
2
Lucent Technologies Inc.
Data Sheet
January 1999
A371-Type Analog Uncooled Isolated
DFB
FastLight
Laser Module
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
Table 2. Electro/Optical Characteristics
(over operating temperature range unless otherwise noted)
Parameter
Operating Temperature
Range
Optical Output Power*
Threshold Current
Drive Current Above
Threshold
Slope Efficiency
Center Wavelength
Spectral Width (–20 dB)
Side-mode Suppression
Ratio
Tracking Error
Forward Voltage
Input Impedance
Monitor Current
Monitor Dark Current
Wavelength Temperature
Coefficient
* See Table 5 for more information.
† V
R
= reverse voltage.
Symbol
T
P
F
I
TH
I
MOD
SE
λ
C
∆λ
SMSR
TE
V
F
R
I
MON
I
D
—
Test Conditions
—
CW, nominal
T = 25
°
C
T = full range
CW, P
F
= 2.0 mW, T = 25
°
C
CW, I
MON
= const., T = full range
CW, P
F
= 2.0 mW, T = 25
°
C
P
F
= 2.0 mW, CW
P
F
= 2.0 mW
CW, P
F
= 2.0 mW
I
MON
= constant, CW
CW
—
V
R†
= 5 V
V
R†
= 5 V
—
Min
–40
—
5
2
10
7.5
67
1280
—
30
—
—
3
100
—
—
Typ
—
2
11
—
20
—
—
—
—
40
0.5
1.1
—
—
10
0.09
Max
85
—
15
50
30
55
200
1335
1
—
1.25
1.6
8
1000
200
0.1
Unit
°
C
mW
mA
mA
mA
µ
W/mA
nm
nm
dB
dB
V
Ω
µ
A
nA
nm/
°
C
Lucent Technologies Inc.
3
A371-Type Analog Uncooled Isolated
DFB
FastLight
Laser Module
Data Sheet
January 1999
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.
Table 3. Analog Characteristics
Parameter
Output Power*
Relative Intensity Noise
Symbol
P
O
RIN
Test Conditions
CW, T = –40
°
C to +85
°
C
CW, P
F
= 2.0 mW,
Freq. = 5 MHz to 300 MHz;
no fiber loss, T = –40
°
C to +85
°
C
–3 dB, P
F
= 2.0 mW,
T = –40
°
C to +85
°
C
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
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
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
T = 25
°
C, P
F
= 2.0 mW
Min
—
—
Typ
2.0
–155
Max
—
–145
Unit
mW
dB/Hz
Modulation Bandwidth
Second-order Distortions
BW
—
1.0
—
—
–54
–58
†
–46
—
–50
–54
†
–42
‡
GHz
dBc
dBc
dBc
Third-order Distortions
—
—
–70
–75
†
–69
–63
–68
†
–61
‡
dBc
dBc
dBc
Spurious Noise
N
SP
—
–63
–61
–60
§
–58
‡
dBc
dBc
Spurious Noise (carrier off)
N'
SP
—
RF Bandpass Flatness
* See Table 5 for more information.
† Double-isolated version.
‡ Low-performance option.
§ Single- and double-isolated versions.
B
P
F
Peak to valley, 5 MHz to 200 MHz
—
–50
–54
†
–45
—
–45
–50
†
–40
‡
1.0
dBc
dBc
dBc
dB
4
Lucent Technologies Inc.
Data Sheet
January 1999
A371-Type Analog Uncooled Isolated
DFB
FastLight
Laser Module
Outline Diagram
Dimensions are in inches (and millimeters).
TRADEMARK, CODE, LASER SERIAL NUMBER,
AND/OR DATE CODE IN APPROXIMATE AREA SHOWN
4
3
2
1
5
6
7
8
1.06 (27.0)
MIN
0.52 (13.2)
39.37 (1000) MIN
PIGTAIL LENGTH
0.045 (1.143)
0.20 (5.00)
0.010
(0.254)
0.29
(7.37)
0.165 (4.20)
0.016 (0.410)
0.100 (2.54)
0.300
(7.62)
0.110 (2.79)
0.085
(2.16)
0.17
(4.32)
0.30
(7.62)
1-899.f
Lucent Technologies Inc.
5
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