1.5 µm D2500-Type Digital
Isolated DFB Laser Module
Data Sheet
February 2000
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.
Table 1. Electrical Characteristics (at 25 °C Laser Temperature)
Parameter
Laser Forward Voltage
Slope Efficiency
Symbol
VLF
η
Test Conditions
Min
—
Typ
1.3
0.10
12
Max
1.8
—
Unit
V
LF = 2 mW (CW)
LF = 2 mW (CW)
0.025
—
mW/mA
mA
V
Threshold Current
ITH
—
50
Monitor Reverse-bias Voltage*
Monitor Current
VRMON
IRMON
ID
—
3
5
10
PO = 1 mW (CW)
0.1
—
1.0
0.01
25
2.0
0.1
—
mA
µA
Monitor Dark Current
Input Impedance
IF = 0, VRMON = 5 V
ZIN
—
—
—
—
Ω
Thermistor Current
ITC
10
—
100
9.6
µA
Resistance Ratio†
—
8.6
—
—
Thermistor Resistance
RTH
ITEC
TL = 25 °C
9.5
—
—
10.5
1.0
kΩ
TL = 25 °C, TC = 70 °C
0.6
A
TEC Current
VTEC
TL = 25 °C, TC = 70 °C
TC = 70 °C
—
1.3
—
2.0
—
V
TEC Voltage
TEC Capacity
∆T
50
°C
* Standard operating condition is 5.0 V reverse bias.
†Ratio of thermistor resistance at 0 °C to thermistor resistance at 50 °C.
Table 2. Optical Characteristics (at 25 °C Laser Temperature)
Parameter
Peak Optical Output Power
Center Wavelength
Symbol
PPEAK
λC
Test Conditions
Min
Typ
—
Max
Unit
mW
nm
—
—
2.0
—
1530
—
1570
Spectral Width:
∆λ
Full Width at –3 dB
Full Width at –20 dB
Modulated at 2.5 Gbits/s at
rated power
—
—
0.20
0.8
0.30
1.0
nm
nm
Side-mode Suppression Ratio
Optical Isolation
SMSR
—
Modulated at 2.5 Gbits/s
30
30
—
—
—
—
dB
dB
0 °C to 65 °C
Table 3. Dispersion Performance (examples of dispersion penalty specifications)
Parameter
Dispersion Penalty:*
Symbol
Test Conditions
Min
Typ
Max Unit
D2502
D2511
D2517
DP
DP
DP
1350 ps/nm
1800 ps/nm
3000 ps/nm
—
—
—
—
—
—
2.0
2.0
2.0
dB
dB
dB
* Other dispersion penalties at various dispersions available.
4
Lucent Technologies Inc.
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