Data Sheet

February 2000

Lucent Technologies Inc.

3

Isolated DFB Laser Module

1.5

µm D2500-Type Digital

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 performance characteristics 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

—2

V

dc Forward Current

—

150

mA

Operating Case Temperature Range

–

40

70

°C

Storage Case Temperature Range*

–

40

85

°C

Photodiode Reverse Voltage

—

10

V

Photodiode Forward Current

—1

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).

Lucent 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

Ω, 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 30 mm (1.18 in.).

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 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 2. Fillister Head Screw

Parameter

Value

Unit

Human-body Model

>400

V

1-532

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)