AGERE D2587P910, D2587P9095, D2587P909, D2587P9085, D2587P908 Datasheet

Data Sheet, Rev. 2

July 2001

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

Applications

■

Telecommunications:
— Dense WDM
— SONET/SDH OC-192/STM-64
— Extended and ultralong reach
— Undersea systems

■

Digital video

Description

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) appli­cations.

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

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

Description

(continued)

Principles of Operation (Controlled W ave­length)

The single-channel, wavelength-selected DFB (ILM) pack­age contains internal wavelength-disc riminating optics , i.e . ,
two etalons and associated photodiodes. The output con­sists 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 sup­presses optical feed back in laser-based, fiber-optic sys­tems. 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 heat ing and cooling of the laser chip to
maintain a temperature of 25 °C for ca se temperatures fro m
–25 °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.

Agere Systems’ optoelectronic components are being qual­ified to rigorous internal standards that are consistent with

Telcordia Technologies

manufacturing oper ations are

†

TR-NWT-000468. All design and

§

9001 certified. The

ISO

module is being fully qualified for central office applications.

*
†

§

is a registered trademark of Fujikura Ltd.

Fujikura
Telcordia Technologies

Inc.

is a registered trademark of The International Organization for

ISO

Standardization.

is a trademark of Telcordia Technologies

CORE
STRESS ROD

PRINCIPLE POLARIZATION
AXIS

CLADDING
INNER COATING

(SILICON & ACRYLATE)
OUTER COAT ING

1-771(C).a

Figure 1. Polarization-Maintaining Fiber

Pin Information

Table 1. Pin Descriptions

Controlled Power

An internal, InGaAs, PIN photodiode functions as the back­facet monitor. The photodiode monitors emission from the
rear facet of the laser and, when used in conjun ct io n with
control circuitry, can control optic al power launched into the
fiber. Normally, this configuration is used in a feedbac k
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 p ath from the RF input. The RF input
has a nominal 25 Ω impedance.

The laser module is equipped with

Fujikura

maintaining fiber (PMF). The fiber is PANDA type an d is the
same fiber that is used on the Agere Systems Inc. lithium
niobate modulators. It has a mode field diameter of

10.5 µm, a cladding diameter of 125µm ±3 µm, and a
loose tube jacketed fiber 900 µm in diameter. Figure 1
shows the orientation of polarization in the fiber.

* polarization-

Pin D2587P-Type D2547P-Type

1 Thermistor Thermistor
2 Thermistor Thermistor
3 Laser dc Bias

(Cathode) (–)

4 Back-facet Monitor

Anode (–)

5 Back-facet Monitor

Cathode (+)
6TEC (+)
7TEC (–)

1
1

Laser dc Bias
(Cathode) (–)

Back-facet Monitor
Anode (–)

Back-facet Monitor
Cathode (+)

TEC (+)
TEC (–)

1
1

8 Case Ground Case Ground
9

Photodiode 2 Anode

λ

10λ Photodiode 1 Anode
11 Laser Anode (+)

2

12 RF Laser Input

Cathode (–)

13 Laser Anode (+)

2

14 NC

1.A positive current through the thermoelectric heat pump cools the
laser.

2.Both leads should be grounded for optimum performance.

Case Ground
Case Ground

Laser Anode (+)
RF Laser Input

Cathode (–)
Laser Anode (+)

Case Ground

2

2

22

Agere Systems Inc.

Data Sheet, Rev. 2 Wavelength-Selected, High-Power D2587P-Type (with Wavelength
July 2001 Locker)/D2547P-Type Isolated DFB Laser Modules

Description

(continued)

76 54 32 1

–+ +– –

L1

TEC

PACKAGE

GROUNDS

8 9 10 11 12 13

140 nH

+–+

R1
20

TH

10 k

ISOLATOR

Ω

Ω

NC

14

1-567

Top view .

Figure 2. D2547P Circuit Schematic

7654321

R

TEC

PD

WAVE

PD

WAVE

PD

POWER

LD

RFC

R

RF

TH

PM FIBER PIGTAIL

Block Diagram

A TO D

CONVERTER

MICROPROCESSOR

8 9 10 11 12 13 14

Figure 3. D2587P Circuit Schematic

DUAL

ETALON

THERMISTOR

EEPROM

D TO A

CONVERTER

THERMOELECTRIC COOLER

SUGGESTED
ELECTRONICS MODULE (CUSTOMER SUPPLIED)

VOLTAGE PROPORTIONAL TO WAVELENGTH
VOLTAGE PROPORTIONAL TO OPTICAL POWER
VOLTAGE PROPORTIONAL TO TEMPERATURE

DFB

SILICON SUBMOUNT

1-1130(F)

LASER MODULE

ISOLATOR AND

FIBER COUPLING

OPTICS

Agere Systems Inc.

1-1129(F)

3

Wavelength-Selected, High-Power D2587P-Type (with Wavelength Data Sheet, Rev. 2
Locker)/D2547P-Type Isolated DFB Laser Modules July 2001

Absolute Maximum Ratings

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 operations sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.

Parameter Symbol Min Max Unit

Laser Reverse Voltage V
dc Forward Current I
Operating Case Temperature Range T
Storage Case Temperature Range* T
Photodiode Reverse Vo lta ge V
Photodiode Forward Current I

* Does not apply to shipping container.

RLMAX

FLMAX

C

stg

RPDMAX

FPDMAX

—2 V

— 225 mA
–25 70 °C
–40 70 °C

—10 V

—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 han­dling 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 kΩ, capacitance = 100
pF) is widely used and, therefore, can be used for com­parison 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 µin. (0.8 µm), and the surface flatness
must be better than 0.001 in. (25.4 µm). Using ther­mal conductive grease is optional; however, thermal
performance can be improved by up to 5% if conduc­tive 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 Out­line 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.

0.062 (1.58)

0.031 (0.79)

0.140
(3.56)

Note: Dimensions are in inches and (millimeters).

0.118
(3.00)

0.086
(2.18)

0.129 (3.28) R

0.041 (1.04)

1-532(C)

Parameter Value Unit

Human-body Model >400 V

4

Figure 4. Fillister Head Screw

Agere Systems Inc.

Data Sheet, Rev. 2 Wavelength-Selected, High-Power D2587P-Type (with Wavelength
July 2001 Locker)/D2547P-Type Isolated DFB Laser Modules

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.

Table 2. D2587-Type Electrical Characteristics

(at 25 °C laser temperature)

Parameter Symbol Test Conditions Min Typ Max Unit

Threshold Current I

TH

Drive Current — L

RMON

RMON

I

λ

PD1

I

λ

PD2

I

LF

D
IN

LF = 20 mW (CW) — 2 2.5 V

PO = 20 mW (CW)

IF = 0, V

Laser Forward Voltage V
Monitor Reverse-bias Voltage* V
Monitor Current:

Back-facet Monitor

Photodiode 1

λ

Photodiode 2

λ

Monitor Dark Current I
Input Impedance Z

— — 15 40 mA

F

= 20 mW — — 165 mA

—3510V

0.003

0.003

0.003

RMON

= 5 V — 0.01 0.1 µA

—
—
—

0.06

0.06

0.06

——25—Ω
Filter Slope — — 0.5 — 8 /nm
Frequency Capture Range — Measured from λ

ITU

15 — — GHz

toward increasing λ and

decreasing λ
Thermistor Current I
Resistance Ratio

†

Thermistor Resistance R
Laser Submount Temperature T
TEC Current I
TEC Voltage V
TEC Capacity ∆TT

TC

— 10 — 100 µA

— — 9.1 9.6 10.1 —

TH

SET

TEC

TEC

TL = 25 °C 9.5 — 10.5 kΩ

—20—35°C
TL = 25 °C, TC = 70 °C — — 1.7 A
TL = 25 °C, TC = 70 °C — — 2.8 V

C

= 70 °C — 50 °C

mA
mA
mA

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

Table 3. D2587-Type Optical Characteristics

(at 25 °C laser temperature)

Parameter Symbol Test Conditions Min Typ Max Unit

Peak Optical Output Power P
Center Wavelength*

(See Ordering Information, page 9.)

Line Width (3 dB full width) ∆λ CW, P

P

C

λ

λ

—20.0——mW

SET

TL = T

C

ITU

= λ

± 0.1 nm

F

= 20.0 mW — 2 10 MHz

1528.77 — 1610.06 nm

Side-mode Suppression Ratio SMSR CW 35 45 — dB
Relative Intensity Noise RIN CW, P

= 20 mW

F

— — –135 dB/Hz

200 MHz < f < 10 GHz
Optical Isolation — T
Optical Polarization Extinction Ratio

†

— 0 °C to 75 °C 20 — — dB

FM Efficiency FM f

Wavelength Drift (EOL) ∆λ

C

C

= 0 °C to 75 °C 30 — — dB

MOD

= 30 kHz,

F

P

= 20 mW

Tested over

—100—MHz/mA

——±2.5GHz

25-year lifeti me

* Custom wavelengths available.
† The

®

ST

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

Agere Systems Inc.

5