D372-Type Digital Uncooled DFB

Data Sheet

Laser Module for 2.5 Gbits/s Applications

December 2000

4

Agere Systems Inc.

* 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.

Reliability Information

Note, the D372-21 product does not undergo any routine dynamic testing.

A 2000-piece sample was tested at 2.5 Gbits/s for SMSR at 0

°C. In that sample, 99.5% of the devices had SMSR

values greater than 30 dB. Within the failures, 90% were for inability to achieve an extinction ration of 10 dB or

more.

Surveillance samples are tested to verify that the failure rate has not changed,

Table 3. D372-21 Electrical/Optical Characteristics (over operating temperature range unless otherwise noted)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Operating Temperature

Range

T—

0

—

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

(See Reliability Information, below)

30

—

—

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

(See Reliability Information, below)

—

—

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