DATASHEET | APRIL 2012
FIBER OPTICS
EMCORE’s Model 3955 DFB laser in TO-can offers a low cost solution for linear
fiberoptic links. These components can be cooled with external thermo-electric
coolers for high stability, or run without TEC’s to reduce power consumption. The
DFB laser in TO-can builds upon Ortel’s long history of high performance, leading
edge designs in CATV, CWDM, wireless, and high speed digital applications. The
laser diode chip is mounted on a compact hermetic TO-can assembly together
with monitor photodiode and isolator, for flexible integration into the pigtail
package configuration.
Applications
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Performance Highlights
Parameters
Operating Case Temperature Range
Frequency Range
Slope Efficiency
Center Wavelength
Side Mode Suppression Ratio, CW
Min
-40
5
0.35
1467
30
Typical
-
-
-
-
-
Max
85
4000
-
1610
-
Units
°C
MHz
mW/mA
nm
dB
Features
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| REV 2012.04
DATASHEET | APRIL 2012
FIBER OPTICS
Absolute Maximum Ratings
1
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress
ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the
operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect
device reliability.
Parameters
Storage Temperature
Operating Case Temperature
Laser Diode Forward Current
Laser Diode Reverse Voltage
Photodiode Forward Current
Photodiode Reverse Voltage
Average RF Input Power
Lead Soldering Temperature/Time
Relative Humidity
ESD
Symbol
T
STG
T
OP
I
OP
V
R
I
MPD
V
MPD,R
PIN
-
RH
-
Condition/Notes
Non-Operating
Continuous
CW
Continuous
Continuous
Continuous
60 Seconds
-
Continuous
Human Body Model
Min
-40
-40
-
-
-
-
-
-
-
-500
Max
85
85
150
1.0
2
10
62
260/10
85
+500
Unit
o
o
C
C
mA
V
mA
V
dBmV
o
C/sec
%
V
1. Absolute maximum data are limited to system design only; proper device performance is not guaranteed over rating
listed above. Operation beyond these maximum conditions may degrade device performance, lead to device failure, shorter
lifetime, and will invalidate the device warranty.
Electrical/Optical Characteristics
Parameters
Series Resistance
Forward Voltage
Threshold Current
Slope Efficiency
Monitor Current
Monitor Dark Current
Linearity
Center Emission Wavelength
Spectral Width
Side Mode Suppression Ratio
Symbol
R
S
V
F
I
Th
SE
I
Mon
I
Mon,dark
Lη
λ
C
∆λ
SMSR
Conditions/Notes
Between I
F
= 20 and 80 mA
At laser threshold
-
-
I
f
= 40 mA, V
MPD
= 5 Vdc
V
MPD
= 5 Vdc
Between 30 and 80 mA
Iop, Top = 25ºC
-
Min
2
-
-
0.35
200
-
Typ
-
-
8
-
-
-
Max
8
1.8
15
-
2000
50
1
Unit
Ohm
V
mA
W/A
µA
nA
Note
1
2
±2 nm
nm
dB
3,4
3,4
3,4
-
-
30
-
-
40
-
1.0
-
-
1. Slope efficiency is measured in a current range between I
th
+ 5 mA and I
th
+ 65 mA.
2. Linearity is calculated by first determining slopes of five sequential pairs of points along the linear portion of the
P
OC
vs. I
F
curve (η
1
, η
2
, ... , η
5
) in the drive current range (30mA and 80 mA). The difference between the maximum and
minimum of these slopes divided by the slope efficiency (defined as the slope of linear regression) defines Linearity.
L
η
=
Max
{
1
,
η
2
,.....,
η
5
}
−
Min
{
1
,
η
2
,.....,
η
5
}
η
η
η
3. Spectrum is measured using an optical spectrum analyzer with a spectral resolution better than 0.1 nm.
4. Lot sample test at 20%.
| REV 2012.04
DATASHEET | APRIL 2012
FIBER OPTICS
Package Outline Drawing
8.6mm Focal Length Option
10.1mm Focal Length Option
1. All the isolated pins (2, 3, and 4) shall be completed isolated from the case, no shortage between the ground pin
(pin 1)and all other three pins.
2. Dimensional tolerances
a.Chip location in relative to the TO header center shall be within +/-30um in both X & Y direction, and +/-30 um in
z-direction (axial).
b. Cap concentricity in relative to the TO header shall be within 50 um in radius.
c. Lead length: 14mm +/-0.5mm
All parts will have ink marking on the side of the base of the TO-56 with the following description.
Ink Marking
A38
A41
A46
A47
Part Description
TO-can, CWDM DFB, RoHS, 8.6mm, Pinout A
TO-can, CWDM DFB, RoHS, 8.6mm, Pinout C
TO-can, CWDM DFB, RoHS, 10.1mm, Pinout A
TO-can, CWDM DFB, RoHS, 10.1mm, Pinout C
| REV 2012.04
DATASHEET | APRIL 2012
FIBER OPTICS
Pinout Configurations
Schematic and Pinout A
3
PD
4
2
LD
1
Pin Definitions for Pinout A
Pin
1
2
3
4
Description
LD Anode, Case Ground
LD Cathode
PD Cathode
PD Anode
Pinout A
Bottom View
Schematic and Pinout C
Pin Definitions for Pinout C
Pin
1
2
3
4
Description
Case
LD Cathode
PD Anode
LD Anode, PD Cathode
Bottom View
| REV 2012.04
DATASHEET | APRIL 2012
FIBER OPTICS
Laser Safety
This product meets the appropriate standard in Title 21 of the Code of Federal Regulations (CFR). FDA/CDRH Class 1 laser
product. This device has been classified with the FDA/CDRH under accession number 0220191.
All Versions of this laser are Class 1 laser product, tested according to IEC 60825-1:2007/EN 60825-1:2007
Wavelength = 1.5
µm.
Maximum power = 50 mW.
Because of size constraints, laser safety labeling (including an FDA class 1 label) 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
AVOID DIRECT EXPOSURE TO BEAM
Wavelength: 1.5
µ
m
Max. Output: 30 mW,
Class 1 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 1 Laser Product IEC-60825-1:20007 Max. Output:30 mw
Wavelength: 1.5
µ
m
| REV 2012.04
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