D372-Type Digital Uncooled DFB
Laser Module for 2.5 Gbits/s Applications
Data Sheet
December 2000
Electrical/Optical Characteristics (continued)
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
Optical Output Power
Threshold Current
Modulation Current
Slope Efficiency*
Center Wavelength
Spectral Width (–20 dB)
Side-mode Suppression
Ratio
Tracking Error
Spontaneous Emission
Rise/Fall Times
Dispersion Penalty
Optical Return Loss
Forward Voltage
Input Impedance
Monitor Current
Monitor Dark Current
Wavelength Tempera-
ture Coefficient
T
PF
ITH
IMOD
SE
λC
∆λ
SMSR
TE
PTH
tR, tF
DP
ORL
VF
R
IMON
ID
—
—
0
CW, peak
T = 25 °C
T = full range
CW, PF = 2.0 mW, T = 25 °C
CW, IMON = const.,T = full range
CW, PF = 2.0 mW, T = 25 °C
PF = 2.0 mW, CW
PF = 2.0 mW
CW, PF = 2.0 mW
(See Reliability Information, below)
IMON = constant, CW
I = (0.9) ITH
10%—90% pulse†, T = 25 °C
<60 km, 256 ps/nm
(See Reliability Information, below)
CW
At bias coil
—
VR‡ = 5 V
VR‡ = 5 V
—
—
5
2
13
7.5
61
1280
—
30
—
—
—
—
18
—
—
100
—
—
—
2
11
—
20
—
—
—
—
—
0.5
—
0.125
—
—
1.1
25
—
10
0.09
85
°C
—
15
50
33
55
154
1335
1
—
mW
mA
mA
mA
µW/mA
nm
nm
dB
1.25
dB
50
µW
0.150 ns
1.0
dB
—
1.6
—
1000
200
0.1
dB
V
Ω
µA
nA
nm/°C
* 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.
‡ VR = reverse voltage.
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,
4
Agere Systems Inc.