4

Lucent Technologies Inc.

Data Sheet

February 2000

Isolated DFB Laser Module

1.5

µm D2500-Type Digital

Characteristics

Minimum and maximum values are testing requirements. Typical values are characteristics of the device and are

the result of engineering evaluations. Typical values are for information purposes only and are not part of the test-

ing requirements.

* Standard operating condition is 5.0 V reverse bias.

† Ratio of thermistor resistance at 0

°C to thermistor resistance at 50 °C.

* Other dispersion penalties at various dispersions available.

Table 1. Electrical Characteristics (at 25

°C Laser Temperature)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Laser Forward Voltage

—

1.3

1.8

V

Slope Efficiency

η

0.025

0.10

—

mW/mA

Threshold Current

—

—

12

50

mA

Monitor Reverse-bias Voltage*

—3

5

10

V

Monitor Current

0.1

1.0

2.0

mA

Monitor Dark Current

—

0.01

0.1

µA

Input Impedance

—

—

25

—

Ω

Thermistor Current

—

10

—

100

µA

—

—

8.6

—

9.6

—

Thermistor Resistance

°C

9.5

—

10.5

k

Ω

TEC Current

—

0.6

1.0

A

TEC Voltage

—

1.3

2.0

V

TEC Capacity

—

—

°C

Table 2. Optical Characteristics (at 25

°C Laser Temperature)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Peak Optical Output Power

—

2.0

—

—

mW

Center Wavelength

—

1530

—

1570

nm

Spectral Width:

Full Width at –3 dB

Full Width at –20 dB

∆λ

Modulated at 2.5 Gbits/s at

rated power

—

—

0.20

0.8

0.30

1.0

nm

nm

Side-mode Suppression Ratio

SMSR

Modulated at 2.5 Gbits/s

30

—

—

dB

Optical Isolation

—

0

°C to 65 °C30

—

—

dB

Table 3. Dispersion Performance (examples of dispersion penalty specifications)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Dispersion Penalty:*

D2502

D2511

D2517

DP

DP

DP

1350 ps/nm

1800 ps/nm

3000 ps/nm

—

—

—

—

—

—

2.0

2.0

2.0

dB

dB

dB