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D372-Type Digital Uncooled DFB
Laser Module for 2.5 Gbits/s Applications
Data Sheet
December 2000
The low-profile D372-Type Laser Module is ideally suited for
OC-48 SONET and other high-speed digital applications.
Features
s
8-pin package suitable for SONET applications
s
Narrow linewidth, distributed feedback, multiquan-
tum-well (DFB-MQW)1.3
m laser with single-
mode fiber pigtail
s
Choice of wide operating temperature ranges:
40
C to +85
C or 0
C to +85
C
s
No TEC required
s
High output power: typical 2.0 mW peak power
coupled into single-mode fiber
s
Hermetically sealed active components
s
Internal back-facet monitor
s
Built-in thermistor and bias T
s
25
input impedance
s
Internal isolator
s
Qualification program:
Telcordia Technologies
*
TA-983
*
Telcordia Technologies
is a registered trademark of Telcordia
Technologies, Inc.
Applications
s
SONET OC-48/STM-16 systems
s
Telecommunications
s
Secure digital data systems
Benefits
s
Easily board mounted
s
Gull wing leads
s
No additional heat sinks required
s
Low-cost alternative to industry-standard, 14-pin
isolated laser module (ILM)
s
Highly efficient DFB-MQW laser structure allows
for lower threshold and drive currents, and reduced
power consumption
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
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.
D372-Type Digital Uncooled DFB
Data Sheet
Laser Module for 2.5 Gbits/s Applications
December 2000
2
2
Agere Systems Inc.
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.
Table 1. Pin Descriptions
Pin Number
Connection
1
Thermistor
2
Thermistor, package GND
3
Laser dc bias cathode () choke
4
Photodiode cathode
5
Photodiode anode
6
Laser diode anode (+)
7
Laser RF input cathode () 25
8
Laser diode anode (+)
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.
* 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
%
1-900.b
5
6
8
7
4
3
1
2
Data Sheet
D372-Type Digital Uncooled DFB
December 2000
Laser Module for 2.5 Gbits/s Applications
3
Agere Systems 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.
Electrical/Optical Characteristics
* 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.
Table 2. D372-20 Electrical/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, peak
--
2
--
mW
Threshold Current
I
TH
T = 25
C
T = full range
5
2
11
--
15
50
mA
mA
Modulation Current
I
MOD
CW, P
F
= 2.0 mW, T = 25
C
CW, I
MON
= const.,T = full range
13
7.5
20
--
33
55
mA
Slope Efficiency*
SE
CW, P
F
= 2.0 mW, T = 25
C
61
--
154
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
Spontaneous Emission
P
TH
I = (0.9) I
TH
--
--
50
W
Rise/Fall Times
t
R
, t
F
10%--90% pulse
, T = 25
C
--
0.125
0.150
ns
Dispersion Penalty
D
P
<60 km, 256 ps/nm
--
--
1.0
dB
Optical Return Loss
ORL
CW
18
--
--
dB
Forward Voltage
V
F
At bias coil
--
1.1
1.6
V
Input Impedance
R
--
--
25
--
Monitor Current
I
MON
V
R
= 5 V
100
--
1000
A
Monitor Dark Current
I
D
V
R
= 5 V
--
10
200
nA
Wavelength Tempera-
ture Coefficient
--
--
--
0.09
0.1
nm/
C
D372-Type Digital Uncooled DFB
Data Sheet
Laser Module for 2.5 Gbits/s Applications
December 2000
4
Agere Systems Inc.
Electrical/Optical Characteristics
(continued)
* 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,
Table 3. D372-21 Electrical/Optical Characteristics
(over operating temperature range unless otherwise noted)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Operating Temperature
Range
T
--
0
--
85
C
Optical Output Power
P
F
CW, peak
--
2
--
mW
Threshold Current
I
TH
T = 25
C
T = full range
5
2
11
--
15
50
mA
mA
Modulation Current
I
MOD
CW, P
F
= 2.0 mW, T = 25
C
CW, I
MON
= const.,T = full range
13
7.5
20
--
33
55
mA
Slope Efficiency*
SE
CW, P
F
= 2.0 mW, T = 25
C
61
--
154
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
(See Reliability Information, below)
30
--
--
dB
Tracking Error
TE
I
MON
= constant, CW
--
0.5
1.25
dB
Spontaneous Emission
P
TH
I = (0.9) I
TH
--
--
50
W
Rise/Fall Times
t
R
, t
F
10%--90% pulse
, T = 25
C
--
0.125
0.150
ns
Dispersion Penalty
D
P
<60 km, 256 ps/nm
(See Reliability Information, below)
--
--
1.0
dB
Optical Return Loss
ORL
CW
18
--
--
dB
Forward Voltage
V
F
At bias coil
--
1.1
1.6
V
Input Impedance
R
--
--
25
--
Monitor Current
I
MON
V
R
= 5 V
100
--
1000
A
Monitor Dark Current
I
D
V
R
= 5 V
--
10
200
nA
Wavelength Tempera-
ture Coefficient
--
--
--
0.09
0.1
nm/
C
Data Sheet
D372-Type Digital Uncooled DFB
December 2000
Laser Module for 2.5 Gbits/s Applications
5
Agere Systems Inc.
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
Conditions
Sample Size
Reference
Mechanical Shock
500 G
11
MIL-STD-883
Method 2002
Vibration
20 g, 20 Hz--2,000 Hz
11
MIL-STD-883
Method 2007
Solderability
--
11
MIL-STD-883
Method 2007
Thermal Shock
Delta T = 100
C
11
MIL-STD-883
Method 2003
Fiber Pull
1 kg; 3 times
11
Telcordia Technologies
983
Accelerated (Biased) Aging
85
C, 5,000 hrs.
25
Telcordia Technologies
983, Section 5.18
High-temperature Storage
85
C, 2,000 hrs.
11
Telcordia Technologies
983
Temperature Cycling
500 cycles
11
Telcordia Technologies
983, Section 5.20
Cyclic Moisture Resistance
10 cycles
11
Telcordia Technologies
983, Section 5.23
Damp Heat
40
C, 95% RH,
1344 hrs.
11
MIL-STD-202
Method 103
Internal Moisture
<5,000 ppm water vapor
11
MIL-STD-883
Method 1018
Flammability
--
--
TR357
Section 4.4.2.5
ESD Threshold
--
6
Telcordia Technologies
983, Section 5.22