Agere Systems D371 DATA SHEET

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Data Sheet

January 1999

D371-Type Digital Uncooled DFB
Laser Module

Applications

■

Long-reach SONET OC-3/OC-12 systems

■

Telecommunications

■

Secure digital data systems

Benefits

The low-profile D371-Type Laser Module is ideally suited for
short- and long-haul SONET and other high-speed digital
applications.

Features

■

Eight-pin package suitable for SONET applications

■

Narrow linewidth, distributed-feedback, multiquan­tum-well (DFB-MQW)1.3 µ m laser with single­mode fiber pigtail

■

Wide operating temperature range:
–40 ° C to +85 ° C

■

No TEC required

■

High output power: typical 2.0 mW peak power
coupled into single-mode fiber

■

Hermetically sealed active components

■

Internal back-facet monitor

■

Easily board mounted

■

Requires no lead bending

■

No additional heat sinks required

■

Pin compatible with industry-standard, 14-pin laser
module

■

Highly efficient DFB-MQW laser structure allows
for lower threshold and drive currents , and reduced
power consumption

Description

The D371-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
applications.

The laser diode is a narrow linewidth (<1 nm) DFB­MQW single-mode laser and an InGaAs PIN photo­diode back-facet monitor in an epoxy-free, hermeti­cally sealed package.

■

Qualification program:
TA-983

*

T elcordia Technologies

Technologies, Inc.

Telcordia Technologies

is a registered trademark of Telcordia

*

Data

Sheet

±

°

°

D371-Type Digital Uncooled DFB Laser Module January 1999

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 typically

0.5 dB over an operating temperature range of –40 ° C

to +85 ° C.
This device incorporates the new Laser 2000 manufac-

turing process developed by the Optoelectronic unit of
Agere Systems Inc. Laser 2000 is a low-cost platform
that targets high-volume manufacturing and tighter
product distributions on all optical subassemblies. The
platform incorporates an advanced optical design that
is produced on a highly automated production line. 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.

43 12

Table 1. Pin Descriptions

Pin Number Connection

1 NC/reserved
2 Case ground
3 NC/reserved
4 Photodiode cathode
5 Photodiode anode
6 Laser diode cathode
7 Laser diode anode
8 NC/reserved

56 87

1-900 (C)

Figure 1. D371-Type Digital Uncooled DFB 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 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

Maximum Peak Laser Drive Current or

Maximum Fiber Power*

Peak Reverse Laser Voltage:

Laser

Monitor
Monitor Forward Current I
Operating Case Temperature Range T
Storage Case Temperature Range T
Lead Soldering Temperature/Time — — 260/10 ° C/s
Relative Humidity (noncondensing) RH — 85 %

OP

I

MAX

P

RL

V

RD

V

FD

C

stg

—
—

—
—

150

10

2

20

mA

mW

V
V

—2mA
–40 85
–40 85

C
C

* Rating varies with temperature.

22

Agere Systems Inc.

Data

Sheet

°

∆λ

Ω

µ

January 1999 D371-Type Digital Uncooled DFB Laser Module

Handling Precautions

Caution: This device is susceptible to dama ge as a result of electrostatic disc harge (ESD). T ake pr oper pre-

cautions during both handling and testing. Follow guidelines such as JEDEC Pub lication No. 108­A (Dec. 1988).

Although protection circuitry is designed into the device, take proper precautions to avoid exposure to ESD.

Electro/Optical Characteristics

Table 2. Electro/Optical Characteristics (over operating temperature range unless otherwise noted)

Parameter Symbol Test Conditions Min Typ Max Unit

Operating Temperature

Range
Optical Output Power* P
Threshold Current I

Modulation Current I

Slope Efficiency

†

Center Wav elength
Spectral Width (–20 dB)
Side-mode Suppression

Ratio
Tracking Error TE I
Spontaneous Emission P
Rise/Fall Times t

Forward Voltage V
Input Impedance R — 3 — 8
Monitor Current I
Monitor Dark Current I
Wav elength Tempera-

ture Coefficient

* 1 mW power option also available. See Table 4 for more information.
† 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.

‡V

= reverse voltage.

R

T — –40 — 85

F

TH

MOD

CW, P

CW, I

SE CW, P

C

λ

SMSR CW, P

TH

, t

R

F

CW, nominal — 2 — mW

T = 25 ° C

T = full range

F

= 2.0 mW, T = 25 ° C

MON

= const. T = full range

F

= 2.0 mW, T = 25 ° C 67 — 200 µ W/mA

F

P

= 2.0 mW, CW 1280 — 1335 nm

P

F

= 2.0 mW, 622 Mbits/s — — 1 nm

= 2.0 mW 30 40 — dB

F

MON

= constant, CW — 0.5 — dB

I = (0.9) I

TH

10%—90% pulse

4
2

10

7.5

11
—

20
—

15
50

30
55

——50
— 0.25 0.5 ns

T = 25 ° C

F

MON

D

CW — 1.1 1.6 V

‡

V

= 5 V 50 — 1000

R

‡

R

V

= 5 V — 10 200 nA

— — — 0.09 0.1 nm/ ° C

C

mA
mA

mA

µ

W

A

Agere Systems Inc.

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