Data Sheet

D372-Type Digital Uncooled DFB

December 2000

Laser Module for 2.5 Gbits/s Applications

3

Agere Systems Inc.

Handling Precautions

Caution: This device is susceptible to damage as a result of electrostatic discharge (ESD). Take proper

precautions during both handling and testing. Follow guidelines such as JEDEC Publication No.

108-A (Dec. 1988).

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

Electrical/Optical Characteristics

* 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.

† Corrected for electrical pulse fall time.

Table 2. D372-20 Electrical/Optical Characteristics (over operating temperature range unless otherwise noted)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Operating Temperature

Range

T

—

–40

—

85

°C

Optical Output Power

CW, peak

—

2

—

mW

Threshold Current

T = 25

°C

T = full range

5

2

11

—

15

50

mA

mA

Modulation Current

°C

13

7.5

20

—

33

55

mA

Slope Efficiency*

SE

°C

61

—

154

µW/mA

Center Wavelength

1280

—

1335

nm

Spectral Width (–20 dB)

∆λ

—

—

1

nm

Side-mode Suppression

Ratio

SMSR

30

40

—

dB

Tracking Error

TE

—

0.5

1.25

dB

Spontaneous Emission

——

50

µW

Rise/Fall Times

°C

—

0.125

0.150

ns

Dispersion Penalty

<60 km, 256 ps/nm

—

—

1.0

dB

Optical Return Loss

ORL

CW

18

—

—

dB

Forward Voltage

At bias coil

—

1.1

1.6

V

Input Impedance

R

—

—

25

—

Ω

Monitor Current

100

—

1000

µA

Monitor Dark Current

—

10

200

nA

Wavelength Tempera-

ture Coefficient

—

—

—

0.09

0.1

nm/

°C