Wavelength-Selected High-Power D2587P-Type (with
Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules
Data Sheet
January 2003
Featuring wavelength selection and locking capabilities, the
D2587P Laser Module is ideally suited for use with external
lithium niobate modulators, and in high-power (20 mW) appli-
cations.
Features
High-performance, multiquantum-well (MQW),
distributed-feedback (DFB) laser
D2587P-Type is offered on 50 GHz ITU grid
wavelengths ranging from 1528.77 nm--
1610.06 nm
D2547P-Type is offered on 100 GHz ITU grid
wavelengths ranging from 1528.77 nm--
1610.06 nm
Polarization-maintaining fiber pigtail
For use with lithium niobate modulators
High optical power (20 mW, CW)
Hermetic, 14-pin package
Applications
Telecommunications:
-- Dense WDM
-- SONET/SDH OC-192/STM-64
-- Extended and ultralong reach
-- Undersea systems
Digital video
Description
The D2587P-Type DFB laser module is designed for
use with an external lithium niobate modulator and
also in applications where high power (20 mW) is
required.
The use of an internal wavelength locker greatly
enhances long-term reliability and reduces chirp and
mode dispersion when used in conjunction with LN
modulators at OC-192 data rates.
A companion device, the D2547P high-power DFB
laser module, is also designed for use with a lithium
niobate external modulator, but without the use of an
internal wavelength locker.
Wavelength-Selected, High-Power D2587P-Type (with Wavelength
Data Sheet
Locker)/D2547P-Type Isolated DFB Laser Modules
January 2003
2
2
For additional information and latest specifications, see our website: www.triquint.com
Description
(continued)
Controlled Wavelength (D2587-Type)
The single-channel, wavelength-selected DFB (ILM) pack-
age contains internal wavelength-discriminating optics, i.e.,
two etalons and two associated photodiodes. The output
consists of analog signals suitable for controlling the electri-
cal current of the thermoelectric cooler (TEC) and the DFB
laser. To maintain constant laser frequency, the ratio of the
etalon detector signal to that of the power detector, R_R
REF
(the response ratio), must be kept constant.
Agere provides the beginning-of-life values for six parame-
ters: laser drive current; the single target ITU channel fre-
quency; laser thermistor resistance for the single specified
operating point; the etalon (1 or 2), which is qualified for use
with the module, R_R
REF
; and the sign of local etalon slope
at ITU point.
Controlled Feedback
The module contains an internal optical isolator that sup-
presses optical feedback in laser-based, fiber-optic sys-
tems. Light reflected back to the laser is attenuated a
minimum of 30 dB.
Controlled Temperature
An integral TEC provides stable thermal characteristics.
The TEC allows for heating and cooling of the laser chip to
maintain a temperature of 25 C for case temperatures from
5 C to +70 C. The laser temperature is monitored by the
internal thermistor, which can be used with external circuitry
to control the laser chip temperature.
Controlled Power
A third internal, InGaAs, unfiltered PIN photodiode functions
as the back-facet power monitor. The photodiode monitors
emission from the rear facet of the laser and, when used in
conjunction with control circuitry, can control optical power
launched into the fiber. Normally, this configuration is used
in a feedback arrangement to maintain consistent laser out-
put power.
Standard Package
The laser module is fabricated in a 14-pin, hermetic, metal/
ceramic butterfly package that incorporates a bias tee that
separates the dc-bias path from the RF input. The RF input
has a nominal 25
impedance.
The laser module is equipped with Fujikura
polarization-
maintaining fiber (PMF). The fiber is PANDA type and is the
same fiber that is used on the Agere Systems Inc. lithium
niobate modulators. It has a mode field diameter of
10.5
m, a cladding diameter of 125 m 3 m, and a tight-
buffered outer jacket diameter of 900
m. Figure 1 shows
the orientation of polarization in the fiber.
Agere Systems' optoelectronic components are being quali-
fied to rigorous internal standards that are consistent with
Telcordia Technologies
TM
TR-NWT-000468. All design and
manufacturing operations are ISO
9001 certified. The
module is being fully qualified for central office applications.
Figure 1. Polarization-Maintaining Fiber
Pin Information
1. A positive current through the thermoelectric heat pump cools the
laser.
2. Both leads should be grounded for optimum performance.
Table 1. Pin Descriptions
Pin D2587P-Type
D2547P-Type
1 Thermistor
Thermistor
2
Thermistor
Thermistor
3
Laser dc Bias
(Cathode) ()
Laser dc Bias
(Cathode) ()
4
Back-facet Monitor
Anode ()
Back-facet Monitor
Anode ()
5
Back-facet Monitor
Cathode (+)
Back-facet Monitor
Cathode (+)
6
TEC (+)
1
TEC (+)
1
7
TEC ()
1
TEC ()
1
8
Case Ground
Case Ground
9
Photodiode 2 Anode
Case Ground
10
Photodiode 1 Anode
Case Ground
11
Laser Anode (+)
2
Laser Anode (+)
2
12 RF Laser Input
Cathode ()
RF Laser Input
Cathode ()
13 Laser Anode (+)
2
Laser Anode (+)
2
14 NC
Case Ground
CORE
STRESS ROD
PRINCIPLE POLARIZATION
AXIS
CLADDING
INNER COATING
OUTER COATING
(SILICON & ACRYLATE)
1-771(C).a
Data Sheet
Wavelength-Selected, High-Power D2587P-Type (with Wavelength
January 2003
Locker)/D2547P-Type Isolated DFB Laser Modules
3
For additional information and latest specifications, see our website: www.triquint.com
Functional Description
6
Top view.
Figure 2. D2547P Circuit Schematic
Figure 3. D2587P Circuit Schematic
Figure 4. Block Diagram
1-567
TEC
L1
140 nH
ISOLATOR
R1
20
PACKAGE
GROUNDS
+
+
+
+
7
6
5
4
3
2
1
8
9
10
11
12
13
TH
10 k
NC
14
TEC
R
TH
PM FIBER PIGTAIL
7
6
5
4
3
2
1
8
9
10
11
12
13
14
PD
WAVE
PD
WAVE
PD
POWER
LD
R
RF
RFC
DFB
SUBMOUNT
THERMOELECTRIC COOLER
DUAL
ETALON
THERMISTOR
ISOLATOR AND
FIBER COUPLING
OPTICS
A TO D
CONVERTER
MICROPROCESSOR
D TO A
CONVERTER
EEPROM
VOLTAGE PROPORTIONAL TO WAVELENGTH
VOLTAGE PROPORTIONAL TO OPTICAL POWER
VOLTAGE PROPORTIONAL TO TEMPERATURE
LASER MODULE
SUGGESTED
ELECTRONICS MODULE (CUSTOMER SUPPLIED)
1-1129(F)
1-1130(F)
Wavelength-Selected, High-Power D2587P-Type (with Wavelength
Data Sheet
Locker)/D2547P-Type Isolated DFB Laser Modules
January 2003
4
For additional information and latest specifications, see our website: www.triquint.com
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.
1. Does not apply to shipping container.
2. Maximum 2000 hrs. at extreme conditions.
Parameter
Symbol
Min
Max
Unit
Laser dc Reverse Voltage
V
RLMAX
--
2
V
Laser dc Forward Current
I
FLMAX
--
225
mA
Operating Case Temperature Range
T
C
5
70
C
Storage Case Temperature Range
1
T
stg
40
85
2
C
Photodiode dc Reverse Voltage
V
RPDMAX
--
10
V
Photodiode dc Forward Current
I
FPDMAX
--
2
mA
Handling Precautions
Power Sequencing
To avoid the possibility of damage to the laser module
from power supply switching transients, follow this
turn-on sequence:
1. All ground connections
2. Most negative supply
3. Most positive supply
4. All remaining connections
Reverse the order for the proper turn-off sequence.
Electrostatic Discharge
CAUTION: This device is susceptible to damage as
a result of electrostatic discharge. Take
proper precautions during both han-
dling and testing. Follow guidelines
such as JEDEC Publication No. 108-A
(Dec. 1988).
Agere 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 k
, capacitance = 100 pF) is widely
used and, therefore, can be used for comparison pur-
poses. The HBM ESD threshold presented here was
obtained using these circuit parameters:
Mounting Instructions
The minimum fiber bend radius is 1.0 in. (25.4 mm).
To avoid degradation in performance, mount the mod-
ule on the board as follows:
1. Place the bottom flange of the module on a flat heat
sink at least 0.5 in. x 1.180 in. (12.7 mm x 30 mm) in
size. The surface finish of the heat sink should be
better than 32
in. (0.8 m), and the surface flatness
must be better than 0.001 in. (25.4
m). Using ther-
mal conductive grease is optional; however, thermal
performance can be improved by up to 5% if conduc-
tive grease is applied between the bottom flange and
the heat sink.
2. Mount four #2-56 screws with Fillister heads
(M2-3 mm) at the four screw hole locations (see Out-
line Diagram). The Fillister head diameter must not
exceed 0.140 in. (3.55 mm). Do not apply more than
1 in.-lb. of torque to the screws.
Note: Dimensions are in inches and (millimeters).
Figure 5. Fillister Head Screw
Parameter Value Unit
Human-body Model
400
V
0.118
(3.00)
0.062 (1.58)
0.140
(3.56)
0.031 (0.79)
0.129 (3.28) R
0.086
(2.18)
0.041 (1.04)
1-532(C)
Data Sheet
Wavelength-Selected, High-Power D2587P-Type (with Wavelength
January 2003
Locker)/D2547P-Type Isolated DFB Laser Modules
5
For additional information and latest specifications, see our website: www.triquint.com
Characteristics
Minimum and maximum values are testing requirements. Typical values are device characteristics and are results
of engineering evaluations; they are for information purposes only and are not part of the testing requirements. All
parameters are beginning of life, unless otherwise specified.
1. Standard operating condition is 5.0 V reverse bias.
2. The (relative) etalon slope is defined as the local slope (in GHz 1) at the Agere-specified ITU operating point, divided by the R_R
REF
(the
response ratio) value at the ITU operating point for the particular module under consideration. Note that the value of this (relative) slope pro-
vides information on the precision required by the customer to maintain control of the R_R
REF
ratio to provide frequency locking. For exam-
ple, 1%/GHz minimum would mean that the R_R
REF
ratio must be controlled to < 2.5% of its BOL Agere-specified value in order to provide
2.5 GHz frequency stability for the module. The local etalon slope may be either positive or negative.
3. Ratio of thermistor resistance at 0 C to thermistor resistance at 50 C.
Table 2. D2587-Type Electrical Characteristics (at 25 C laser temperature)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Threshold Current
I
TH
--
--
15
40
mA
Drive Current
--
L
F
= 20 mW
--
--
165
mA
Laser Forward Voltage
V
LF
L
F
= 20 mW (CW)
--
2
2.5
V
Monitor Reverse-bias Voltage
1
V
RMON
--
3
5
10
V
Monitor Current:
Back-facet Monitor
Photodiode 1
Photodiode 2
I
RMON
I
PD1
I
PD2
P
O
= 20 mW (CW)
6
6
6
--
--
--
200
200
200
A
A
A
Monitor Dark Current
I
D
I
F
= 0, V
RMON
= 5 V
--
0.01
0.1
A
Input Impedance
Z
IN
--
--
25
--
Etalon Slope ()
2
--
--
0.5
--
8
%/GHz
Frequency Capture Range
--
Measured from f
ITU
toward increasing f and
decreasing f
15
--
--
GHz
Thermistor Current
I
TC
--
10
--
100
A
Resistance Ratio
3
--
--
9.1
9.6
10.1
--
Thermistor Resistance
R
TH
T
L
= 25 C
9.5
--
10.5
k
Laser Submount Temperature
T
SET
--
20
--
35
C
TEC Current
I
TEC
T
L
= 25 C, T
C
= 70 C
--
--
1.7
A
TEC Voltage
V
TEC
T
L
= 25 C, T
C
= 70 C
--
--
2.8
V
TEC Capacity
T
T
C
= 70 C
--
50
C
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