4

Agere Systems Inc.

D2570, D2526G, D2555 Wavelength-Selected

Data Sheet, Rev. 3

Direct Modulated Isolated DFB Laser Module

July 2001

D2526 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 testing

requirements.

* Standard operating condition is 5.0 V reverse bias.

† Ratio of thermistor resistance at 0 °C to thermistor resistance at 50 °C.

Table 1. Electrical Characteristics (at 25 °C laser temperature)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Slope Efficiency

η

0.06

0.09

0.13

mW/mA

Threshold Current

——

14

30

mA

Laser Forward Voltage

—

1.3

1.8

V

Laser Submount Temperature

—20

—

30

°C

Monitor Reverse-bias Voltage*

—3

5

10

V

Monitor Current

0.1

0.3

1.5

mA

Monitor Dark Current

—

0.01

0.1

µA

Input Impedance

——

25

—

Ω

Thermistor Current

—

10

—

100

µA

—

—

9.1

—

9.6

—

Thermistor Resistance

9.5

—

10.5

k

Ω

TEC Current

—

0.6

1.0

A

TEC Voltage

—

1.3

2.0

V

TEC Capacity

—

—

50

°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

(See Table 10.)

CW wavelength

1528.77

—

1610.06

nm

Line Width (3 dB full width)

∆λ

Modulated at 2.5 Gbits/s

at rated power

—2

10

MHz

Side-mode Suppression Ratio

SMSR

CW

30

—

—

dB

Optical Isolation

—

30

—

—

dB

Wavelength Drift (EOL)

∆λ

Tested over

25-year lifetime

——

±0.1

nm

Center Wavelength Drift with

Case Temperature

0 °C

—

—

1

pm/°C

Wavelength Temperature Tuning

Coefficient

—

—

—

0.095

—

nm/°C

Tracking Error

—

—

—

1

dB

Table 3. Dispersion Performance

Parameter

Symbol

Test

Conditions

Min

Typ

Max

Unit

Dispersion Penalty for Extended Reach

DP

1800 ps/nm

—

—

2.0

dB