Wavelength-Selected High-Power D2587P-Type (with
Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules

Data Sheet, Rev. 2

July 2001

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, Rev. 2

Locker)/D2547P-Type Isolated DFB Laser Modules

July 2001

Agere Systems Inc.

Description

(continued)

Principles of Operation (Controlled Wave-
length)

The single-channel, wavelength-selected DFB (ILM) pack-
age contains internal wavelength-discriminating optics, i.e.,
two etalons and associated photodiodes. The output con-
sists of analog signals suitable for controlling the electrical
current of the thermoelectric cooler (TEC) and the DFB
laser.

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
25 °C to +70 °C. The laser temperature is monitored by
the internal thermistor, which can be used with external cir-
cuitry to control the laser chip temperature.

Controlled Power

An internal, InGaAs, PIN photodiode functions as the back-
facet 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 output 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

loose tube jacketed fiber 900

m in diameter. Figure 1

shows the orientation of polarization in the fiber.

Agere Systems' optoelectronic components are being qual-
ified to rigorous internal standards that are consistent with

Telcordia Technologies

TR-NWT-000468. All design and

manufacturing operations are

ISO

9001 certified. The

module is being fully qualified for central office applications.

Fujikura

is a registered trademark of Fujikura Ltd.

Telcordia Technologies

is a trademark of Telcordia Technologies

Inc.

ISO

is a registered trademark of The International Organization for

Standardization.

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

Laser dc Bias
(Cathode) ()

Back-facet Monitor
Anode ()

Back-facet Monitor
Cathode (+)

TEC (+)

TEC ()

Case Ground

Photodiode 2 Anode

Case Ground

Photodiode 1 Anode

Case Ground

Laser Anode (+)

RF Laser Input
Cathode ()

Laser Anode (+)

Case Ground

CORE

STRESS ROD

PRINCIPLE POLARIZATION

AXIS

CLADDING

INNER COATING

OUTER COATING

(SILICON & ACRYLATE)

1-771(C).a

Data Sheet, Rev. 2

Wavelength-Selected, High-Power D2587P-Type (with Wavelength

July 2001

Locker)/D2547P-Type Isolated DFB Laser Modules

Agere Systems Inc.

Description

(continued)

Top view.

Figure 2. D2547P Circuit Schematic

Figure 3. D2587P Circuit Schematic

Block Diagram

1-567

TEC

140 nH

ISOLATOR

R1
20

PACKAGE

GROUNDS

10 k

TEC

PM FIBER PIGTAIL

WAVE

POWER

RFC

DFB

SILICON 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, Rev. 2

Locker)/D2547P-Type Isolated DFB Laser Modules

July 2001

Agere Systems Inc.

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.

* Does not apply to shipping container.

Parameter

Symbol

Min

Max

Unit

Laser Reverse Voltage

RLMAX

dc Forward Current

FLMAX

225

Operating Case Temperature Range

°C

Storage Case Temperature Range*

stg

°C

Photodiode Reverse Voltage

RPDMAX

Photodiode Forward Current

FPDMAX

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 Systems 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 com-
parison purposes. 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 4. Fillister Head Screw

Parameter Value Unit

Human-body Model

>400

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, Rev. 2

Wavelength-Selected, High-Power D2587P-Type (with Wavelength

July 2001

Locker)/D2547P-Type Isolated DFB Laser Modules

Agere Systems Inc.

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.

* Standard operating condition is 5.0 V reverse bias.
Ratio of thermistor resistance at 0 °C to thermistor resistance at 50 °C.

* Custom wavelengths available.
The

ferrule key is not aligned to slow axis of fiber. Connector is intended for testing purposes only.

Table 2. D2587-Type Electrical Characteristics (at 25 °C laser temperature)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Threshold Current

Drive Current

= 20 mW

165

Laser Forward Voltage

= 20 mW (CW)

2.5

Monitor Reverse-bias Voltage*

RMON

Monitor Current:

Back-facet Monitor

Photodiode 1

Photodiode 2

RMON

PD1

PD2

= 20 mW (CW)

0.003
0.003
0.003

--
--
--

0.06
0.06
0.06

mA
mA
mA

Monitor Dark Current

= 0, V

RMON

= 5 V

0.01

0.1

Input Impedance

Filter Slope

0.5

/nm

Frequency Capture Range

Measured from

ITU

toward increasing

and

decreasing

GHz

Thermistor Current

100

Resistance Ratio

9.1

9.6

10.1

Thermistor Resistance

= 25 °C

9.5

10.5

Laser Submount Temperature

SET

°C

TEC Current

TEC

= 25 °C, T

= 70 °C

1.7

TEC Voltage

TEC

= 25 °C, T

= 70 °C

2.8

TEC Capacity

= 70 °C

°C

Table 3. D2587-Type Optical Characteristics (at 25 °C laser temperature)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Peak Optical Output Power

20.0

Center Wavelength*

(See Ordering Information, page 9.)

= T

SET

ITU

± 0.1 nm

1528.77

1610.06

Line Width (3 dB full width)

CW, P

= 20.0 mW

MHz

Side-mode Suppression Ratio

SMSR

Relative Intensity Noise

RIN

CW, P

= 20 mW

200 MHz < f < 10 GHz

135

dB/Hz

Optical Isolation

= 0 °C to 75 °C

Optical Polarization Extinction Ratio

0 °C to 75 °C

FM Efficiency

MOD

= 30 kHz,

= 20 mW

100

MHz/mA

Wavelength Drift (EOL)

Tested over

25-year lifetime

±2.5

GHz

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