Data Sheet
March 2006
D372-Type Digital, Uncooled DFB
Laser Module for 2.5 Gb/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 iso-
lated 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
µm
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 cou-
pled 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 configuration
(see Figure 1 and/ or Table 1) and is ideal for long-
reach (SONET) and other high-speed digital applica-
tions.
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.
This package is optimized for a 25
Ω
input impedance
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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D372-Type Digital, Uncooled DFB
Laser Module for 2.5 Gb/s Applications
Data Sheet
March 2006
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 Laser 2000 manufacturing
process from CyOptics Inc. Laser 2000 is a low-cost
platform that targets high-volume manufacturing and
tighter product distributions on all optical subassem-
blies. This platform incorporates an advanced optical
design that is produced on one of the highly automated
production lines at CyOptics’ manufacturing facility.
The Laser 2000 platform is qualified for the central
office and uncontrolled environments, and can be used
for applications 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
For additional information and latest specifications, see our website:
www.cyoptics.com
Data Sheet
March 2006
D372-Type Digital, Uncooled DFB
Laser Module for 2.5 Gb/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).
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 (resis-
tance = 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, 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
hazardous laser radiation exposure.
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 IIIb Laser Product
per CDRH, 21 CFR 1040
Max. Output: 10 mW
Wavelength: 1.3
µm
For additional information and latest specifications, see our website:
www.cyoptics.com
3
D372-Type Digital, Uncooled DFB
Laser Module for 2.5 Gb/s Applications
Data Sheet
March 2006
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
—
V
R‡
= 5 V
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
µW/mA
nm
nm
dB
dB
µW
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.
4
For additional information and latest specifications, see our website:
www.cyoptics.com
Data Sheet
March 2006
D372-Type Digital, Uncooled DFB
Laser Module for 2.5 Gb/s Applications
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
µW/mA
nm
nm
dB
dB
µW
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 Gb/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,
For additional information and latest specifications, see our website:
www.cyoptics.com
5
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