Data Sheet
December 2000
D372-Type Digital Uncooled DFB
Laser Module for 2.5 Gbits/s Applications
Applications
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SONET OC-48/STM-16 systems
Telecommunications
Secure digital data systems
Benefits
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Easily board mounted
Gull wing leads
No additional heat sinks required
Low-cost alternative to industry-standard, 14-pin
isolated laser module (ILM)
Highly efficient DFB-MQW laser structure allows
for lower threshold and drive currents, and reduced
power consumption
The low-profile D372-Type Laser Module is ideally suited for
OC-48 SONET and other high-speed digital applications.
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Features
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8-pin package suitable for SONET applications
Narrow linewidth, distributed feedback, multiquan-
tum-well (DFB-MQW)1.3
µ
m laser with single-
mode fiber pigtail
Choice of wide operating temperature ranges:
–40
°
C to +85
°
C or 0
°
C to +85
°
C
No TEC required
High output power: typical 2.0 mW peak power
coupled into single-mode fiber
Hermetically sealed active components
Internal back-facet monitor
Built-in thermistor and bias T
25
Ω
input impedance
Internal isolator
Qualification program:
Telcordia Technologies
*
TA-983
Description
The D372-type uncooled laser module consists of a
laser diode coupled to a single-mode fiber pigtail.
The device is available in a standard, 8-pin configu-
ration (see Figure 1 and/or Table 1) and is ideal for
long-reach (SONET) and other high-speed digital
applications.
The module includes a narrow linewidth (<1 nm),
DFB-MQW single-mode laser and an InGaAs PIN
photodiode back-facet monitor in a hermetically
sealed package.
This package is optimized for a 25
Ω
input imped-
ance and allows for dc biasing through an internal
bias T. A thermistor has been included for feedback
to board-level bias circuitry, if needed.
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*
Telcordia Technologies
is a registered trademark of Telcordia
Technologies, Inc.
D372-Type Digital Uncooled DFB
Laser Module for 2.5 Gbits/s Applications
Data Sheet
December 2000
Table 1. Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
Connection
Thermistor
Thermistor, package GND
Laser dc bias cathode (–) choke
Photodiode cathode
Photodiode anode
Laser diode anode (+)
Laser RF input cathode (–) 25
Ω
Laser diode anode (+)
Description
(continued)
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
photodiode current, the change in optical output is typi-
cally
±
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 Optoelectronic Products unit of
Agere Systems Inc.. Laser 2000 is a low-cost platform
that targets high-volume manufacturing and tighter
product distributions on all optical subassemblies. This
platform incorporates an advanced optical design that
is produced on one of the highly automated production
lines at the Opotelectronic manufacturing facility. The
laser 2000 platform is qualified for the central office and
uncontrolled environments, and can be used for appli-
cations requiring high performance and low cost.
4
3
2
1
5
6
7
8
1-900.b
Figure 1. D372-Type Digital Uncooled DFB Mini 8-Pin Laser Module Schematic, Top View
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
Agere Systems Inc.
Data Sheet
December 2000
D372-Type Digital Uncooled DFB
Laser Module for 2.5 Gbits/s Applications
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.
Electrical/Optical Characteristics
Table 2. D372-20 Electrical/Optical Characteristics
(over operating temperature range unless otherwise noted)
Parameter
Operating Temperature
Range
Optical Output Power
Threshold Current
Modulation Current
Slope Efficiency*
Center Wavelength
Spectral Width (–20 dB)
Side-mode Suppression
Ratio
Tracking Error
Spontaneous Emission
Rise/Fall Times
Dispersion Penalty
Optical Return Loss
Forward Voltage
Input Impedance
Monitor Current
Monitor Dark Current
Wavelength Tempera-
ture Coefficient
Symbol
T
P
F
I
TH
I
MOD
SE
λ
C
∆λ
SMSR
TE
P
TH
t
R
, t
F
D
P
ORL
V
F
R
I
MON
I
D
—
Test Conditions
—
CW, peak
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
I = (0.9) I
TH
10%—90% pulse
†
, T = 25
°
C
<60 km, 256 ps/nm
CW
At bias coil
—
‡
=5V
V
R
V
R‡
= 5 V
—
Min
–40
—
5
2
13
7.5
61
1280
—
30
—
—
—
—
18
—
—
100
—
—
Typ
—
2
11
—
20
—
—
—
—
40
0.5
—
0.125
—
—
1.1
25
—
10
0.09
Max
85
—
15
50
33
55
154
1335
1
—
1.25
50
0.150
1.0
—
1.6
—
1000
200
0.1
Unit
°
C
mW
mA
mA
mA
µ
W/mA
nm
nm
dB
dB
µ
W
ns
dB
dB
V
Ω
µ
A
nA
nm/
°
C
* The slope efficiency is used to calculate the modulation current for a desired output power. This modulation current plus the threshold current
comprise the total operating current for the device.
† Corrected for electrical pulse fall time.
‡ V
R
= reverse voltage.
Agere Systems Inc.
3
D372-Type Digital Uncooled DFB
Laser Module for 2.5 Gbits/s Applications
Data Sheet
December 2000
Electrical/Optical Characteristics
(continued)
Table 3. D372-21 Electrical/Optical Characteristics
(over operating temperature range unless otherwise noted)
Parameter
Operating Temperature
Range
Optical Output Power
Threshold Current
Modulation Current
Slope Efficiency*
Center Wavelength
Spectral Width (–20 dB)
Side-mode Suppression
Ratio
Tracking Error
Spontaneous Emission
Rise/Fall Times
Dispersion Penalty
Optical Return Loss
Forward Voltage
Input Impedance
Monitor Current
Monitor Dark Current
Wavelength Tempera-
ture Coefficient
Symbol
T
P
F
I
TH
I
MOD
SE
λ
C
∆λ
SMSR
TE
P
TH
t
R
, t
F
D
P
ORL
V
F
R
I
MON
I
D
—
Test Conditions
—
CW, peak
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
(See Reliability Information, below)
I
MON
= constant, CW
I = (0.9) I
TH
10%—90% pulse
†
, T = 25
°C
<60 km, 256 ps/nm
(See Reliability Information, below)
CW
At bias coil
—
V
R‡
= 5 V
V
R‡
= 5 V
—
Min
0
—
5
2
13
7.5
61
1280
—
30
—
—
—
—
18
—
—
100
—
—
Typ
—
2
11
—
20
—
—
—
—
—
0.5
—
0.125
—
—
1.1
25
—
10
0.09
Max
85
—
15
50
33
55
154
1335
1
—
1.25
50
0.150
1.0
—
1.6
—
1000
200
0.1
Unit
°
C
mW
mA
mA
mA
µ
W/mA
nm
nm
dB
dB
µ
W
ns
dB
dB
V
Ω
µA
nA
nm/°C
* The slope efficiency is used to calculate the modulation current for a desired output power. This modulation current plus the threshold current
comprise the total operating current for the device.
† Corrected for electrical pulse fall time.
‡ V
R
= reverse voltage.
Reliability Information
Note, the D372-21 product does not undergo any routine dynamic testing.
A 2000-piece sample was tested at 2.5 Gbits/s for SMSR at 0
°
C. In that sample, 99.5% of the devices had SMSR
values greater than 30 dB. Within the failures, 90% were for inability to achieve an extinction ration of 10 dB or
more.
Surveillance samples are tested to verify that the failure rate has not changed,
4
Agere Systems Inc.
Data Sheet
December 2000
D372-Type Digital Uncooled DFB
Laser Module for 2.5 Gbits/s Applications
Qualification Information
The D372-type laser module is scheduled to complete the following qualification tests and meets the intent of
Tel-
cordia Technologies
TR-NWT-000468 for interoffice environments and TA-TSY-000983 for outside plant environ-
ments.
Table 4. D372-Type Laser Module Qualification Test Plan
Qualification Test
Mechanical Shock
Vibration
Solderability
Thermal Shock
Fiber Pull
Accelerated (Biased) Aging
High-temperature Storage
Temperature Cycling
Cyclic Moisture Resistance
Damp Heat
Internal Moisture
Flammability
ESD Threshold
Conditions
500 G
20 g, 20 Hz—2,000 Hz
—
Delta T = 100
°C
1 kg; 3 times
85
°C,
5,000 hrs.
85
°C,
2,000 hrs.
500 cycles
10 cycles
40
°C,
95% RH,
1344 hrs.
<5,000 ppm water vapor
—
—
Sample Size
11
11
11
11
11
25
11
11
11
11
11
—
6
Reference
MIL-STD-883
Method 2002
MIL-STD-883
Method 2007
MIL-STD-883
Method 2007
MIL-STD-883
Method 2003
Telcordia Technologies
983
Telcordia Technologies
983, Section 5.18
Telcordia Technologies
983
Telcordia Technologies
983, Section 5.20
Telcordia Technologies
983, Section 5.23
MIL-STD-202
Method 103
MIL-STD-883
Method 1018
TR357
Section 4.4.2.5
Telcordia Technologies
983, Section 5.22
Agere Systems Inc.
5
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