Data Sheet
October 2005
A371-Type Analog, Uncooled, Isolated DFB
Laser Module
Applications
Video and data applications
Downstream telephony and data
Return path systems
Mixed analog and digital modulation
Telecommunications
Benefits
Easily board mounted
Requires no lead bending
The low-profile A371-type analog laser module is ideally suited
for CATV applications.
No additional heat sinks required
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
Features
Eight-pin package suitable for CATV applications
Narrow linewidth, distributed-feedback,
multiquantum-well (DFB-MQW)1.3
µm
laser with sin-
gle-mode fiber pigtail
Wide operating temperature range:
–40
°C
to +85
°C
Frequency range up to 1.0 GHz
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:
Telcordia Technologies™
TA-
983
A371-Type Analog, Uncooled, Isolated DFB
Laser Module
Data Sheet
October 2005
4
3
2
1
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 CyOptics Laser 2000
manufacturing process. Laser 2000 is a low-cost plat-
form that targets high-volume manufacturing and tight
product distributions on all optical subassemblies. This
platform incorporates an advanced optical design that
is produced on highly automated production lines. The
Laser 2000 platform is qualified for central office and
uncontrolled environments, and can be used for appli-
cations requiring high performance and low cost.
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6
7
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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 pe-
riods 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
For additional information and latest specifications, see our website:
www.cyoptics.com
Data Sheet
October 2005
A371-Type Analog, Uncooled, Isolated DFB
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).
CyOptics employs a human-body model (HBM) for ESD-susceptibility testing and protection-design evaluation.
ESD voltage thresholds are dependent on the critical parameters used to define the model. A standard HBM
(resistance = 1.5 kΩ, capacitance = 100 pF) is widely used and can be used for comparison purposes.
Laser Safety Information
Class IIIb Laser Product
FDA/CDRH Class IIIb laser product. All versions are Class IIIb laser products per CDRH, 21 CFR 1040 Laser
Safety requirements. All versions are classified Class 3B laser products consistent with
IEC
®
60825-1: 1993. This
device family has been classified with the FDA under accession number 8720010. Measurements were made to
classify the product per
IEC
60825-1: 1993.
This product complies with 21 CFR 1040.10 and 1040.11.
8.3
µm
single-mode pigtail or connector
Wavelength = 1.3
µm
Maximum power = 10 mW
Because of size constraints, laser safety labeling is not affixed to the module but attached to the outside of the
shipping carton.
Product is not shipped with power supply.
Caution: Use of controls, adjustments, and procedures other than those specified herein may result in haz-
ardous laser radiation exposure.
DANGER
INVISIBLE LASER RADIATION
AVOID DIRECT EXPOSURE TO BEAM
Wavelength: 1.3
µm
Max. Output: 10 mW,
Class IIIb Laser Product
DANGER
INVISIBLE LASER RADIATION
IS EMITTED FROM THE END
OF FIBER OR CONNECTOR
Avoid direct exposure to beam
Do not view beam directly with
optical instruments
INVISIBLE LASER RADIATION EMITTED FROM END OF FIBER OR CONNECTOR
Avoid exposure to beam
Class 3R Laser Product
Max. Output: 10 mW
Wavelength: 1.3
µm
For additional information and latest specifications, see our website:
www.cyoptics.com
3
A371-Type Analog, Uncooled, Isolated DFB
Laser Module
Data Sheet
October 2005
Electrical/Optical Characteristics
Table 2. Electrical/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 Tempera-
ture Coefficient
* V
R
= reverse voltage.
Symbol
T
OP
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
µW/mA
nm
nm
dB
dB
V
Ω
µA
nA
nm/°C
4
For additional information and latest specifications, see our website:
www.cyoptics.com
Data Sheet
October 2005
A371-Type Analog, Uncooled, Isolated DFB
Laser Module
Electrical/Optical Characteristics
(continued)
Analog Operation
The A371-type laser module can be used in a wide variety of analog operations. These may include several chan-
nels 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 CyOptics believes will give a broad indication of the performance of the A371 series laser
module.
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.
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 = 25
°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
B
P
F
Peak to valley, 5 MHz to 200 MHz
—
–50
–54
*
–45
—
–45
–50
*
–40
†
1.0
dBc
dBc
dBc
dB
* Double-isolated version (see Table 5 for ordering information).
† Low-performance option
‡ Single- and double-isolated versions.
For additional information and latest specifications, see our website:
www.cyoptics.com
5
