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Agere Systems Inc.
D2570, D2526G, D2555 Wavelength-Selected
Direct Modulated Isolated DFB Laser Module
Data Sheet, Rev. 3
July 2001
D2570 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.
Table 7. Electrical Characteristics (at 25 °C laser temperature)
Parameter
Symbol
η
I
TH
V
LF
T
LASER
V
RMON
I
RMON
I
D
Z
IN
I
TC
—
R
TH
I
TEC
V
TEC
T
Test Conditions
L
F
= 10 mW (CW)
—
L
F
= 10 mW (CW)
—
—
P
OL
= 5 mW (CW)
I
F
= 0, V
RMON
= 5 V
—
—
—
T
L
= 25 °C
T
L
= 25 °C, T
C
= 70 °C
T
L
= 25 °C, T
C
= 70°C
T
C
= 70 °C
Min
0.12
—
—
20
3
0.25
—
—
10
9.1
9.5
—
—
—
Typ
0.15
14
1.3
—
5
0.7
0.01
25
—
—
—
0.6
1.3
—
Max
0.2
25
1.8
30
10
1.25
0.1
—
100
9.6
10.5
1.0
2.0
50
Unit
mW/mA
mA
V
°C
V
mA
μ
A
μA
—
k
A
V
°C
Slope Efficiency
Threshold Current
Laser Forward Voltage
Laser Submount Temperature
Monitor Reverse-bias Voltage*
Monitor Current
Monitor Dark Current
Input Impedance
Thermistor Current
Resistance Ratio
Thermistor Resistance
TEC Current
TEC Voltage
TEC Capacity
Table 8. Optical Characteristics (at 25 °C laser temperature)
Parameter
Symbol
P
PEAK
λ
c
Test Conditions
—
T
L
= 25 °C
CW wavelength
Modulated at 2.5 Gbits/s
at rated power
CW
T
C
= 0 °C to 70 °C
Tested over
25-year lifetime
0 °C
≤
T
C
≤
70 °C
Min
10
Typ
—
—
Max
—
1610.06
Unit
mW
nm
Peak Optical Output Power
Center Wavelength
(See Table 12.)
Line Width (3 dB full width)
1528.77
λ
—
2
10
MHz
Side-mode Suppression Ratio
Optical Isolation
Wavelength Drift (EOL)
SMSR
—
λ
30
30
—
—
—
—
—
—
±0.1
dB
dB
nm
Center Wavelength Drift with
Case Temperature
Wavelength Temperature Tuning
Coefficient
Tracking Error
λ
C
/
T
C
—
—
1
pm/°C
—
—
—
0.095
—
nm/°C
—
T
C
= –20 °C/25 °C/70 °C
—
—
1
dB
Table 9. Dispersion Performance
Parameter
Symbol
Test
Conditions
1800 ps/nm
Min
Typ
Max
Unit
Dispersion Penalty for Extended Reach
DP
—
—
2.5
dB
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