1,550nm Modulator
Integrated DFB Laser
FEATURES
FLD5F14CN-E
• Long transmission capability of over 10,000ps/nm in 2.5 Gb/s systems
• Modulator Integrated DFB Laser Diode Module
• CW operation of DFB laser section
• Modulation voltage applied only to modulator section
• 1,550nm peak wavelength region and very low wavelength chirping
• 14-pin high speed butterfly package with fiber pigtail
• Built-in optical isolator, monitor photodiode, thermistor, and
thermo-electric cooler
• Selected wavelength according to ITU-T grid available
APPLICATION
This MI laser is intended for application in 2.5 Gb/s long haul
transmission links over 10,000ps/nm (with Erbium Doped Fiber Amplifiers (EDFA)).
DESCRIPTION
The Modulator Integrated DFB Laser (MI DFB Laser) has an electro-absorption modulator
monolithically integrated with a conventional Distributed Feed-Back (DFB) laser. The modulation
voltage is applied to the modulator section while the laser section operates CW allowing extremely
low wavelength chirping. Transmission spans in excess of 10,000ps/nm are achievable. Extinction
ratios of greater than 10 dB are achievable with 2Vp-p modulation. The MI laser is installed in a butter
fly type package. The module incorporates a highly stable optical coupling system. The module
includes an optical isolator, monitor photodiode, thermistor and a thermo-electric cooler. Selected
wavelengths according to the ITU-T grid are available for Dense Wavelength Division Multiplexing
(DWDM) applications.
ABSOLUTE MAXIMUM RATINGS (Tc=25°C, unless otherwise specified)
Rating
Parameter
Operating Case Temperature
Storage Temperature
Optical Output Power
Laser Forward Current
Laser Reverse Voltage
Modulator Forward Voltage
Modulator Reverse Voltage
Monitor Diode Reverse Voltage
Monitor Diode Forward Current
TEC Voltage
TEC Current
Thermistor Temperature
Symbol
Top
Tstg
Pf
IF
VR
Vm
Vear
Vmonr
Imon
Vc
Ic
Tth
-
-
Cooling
Heating
Cooling
Heating
ATC Operation
Condition
-
-
CW
CW
CW
Min.
0
-40
-
-
-
-
-
-
-
-
-2.5
-
-0.9
0
Max.
+65
+70
5
150
2
1
5
20
1
+2.5
-
+1.4
-
+65
Unit
°
C
°
C
mW
mA
V
V
V
mA
V
V
A
°C
Edition 1.2
July 2004
1
FLD5F14CN-E
Parameter
Monitor Current
Monitor Dark Current
Monitor Diode Capacitance
Symbol
Im
Id
Ct
Test Condition
1,550nm Modulator
Integrated DFB Laser
Limits
Typ.
-
2
2
MONITOR DIODE CHARACTERISTICS (TL= Tset, Tc = 25°C, BOL, unless otherwise specified)
Min.
50
-
-
Max.
2,000
100
20
Unit
µA
nA
pF
CW, IF=Iop, Vm=Vo, VDR=5V
VDR=5V
VDR=5V, f=1 MHz
TEC AND THERMISTOR CHARACTERISTICS (TL= Tset, Tc = 25°C, BOL, unless otherwise specified)
Parameter
TEC Current
TEC Voltage
Symbol
Ic
Vc
Pc
Rtec
Rth
B
TE
Test Condition
CW, IF=Iop, Vm=Vo, TL=Tset, Tc=+65°C
CW, IF=Iop, Vm=Vo, TL=Tset, Tc=+65°C
CW, IF=Iop, Vm=Vo, TL=Tset, Tc=+65°C
CW, IF=Iop, Vm=Vo
Limits
Min. Typ. Max.
-
-
1.0
Unit
A
-
-
2.4
V
W
Ω
kΩ
TEC Power Consumption
TEC Resistance
-
2.0
-
2.3
2.4
3.2
Thermistor Resistance
TL=+15 to +35°C
-
CW, IF=Iop, Vm=Vo, Tc=0 to+65°C
6.3
-
15.4
Thermistor B Constant
Tracking Error
BOL: Beginning of Life
3,270 3,450 3,630
-0.5
-
+0.5
K
dB
2
1,550nm Modulator
Integrated DFB Laser
FLD5F14CN-E
Test Condition
-
-
CW, Vm=Vo
CW
Note (1)
CW, IF=Iop, Vm=Vo
CW, IF=Iop
CW, IF=Iop, Vm=Vo/(Vo-2)
Note (2)
Note (2)
Note (3)
Note (2), 20 to 80%
Note (2), 20 to 80%
CW, Vm<0
f=2.5 GHz, 50Ω Test Set,
Vm=Vo, IF=Iop
-3dB bandwidth, 50Ω Test
Set, Vm=Vo-0.5(Vmod), IF=Iop
f=2.5 GHz, Vm=Vo, IF=Iop,
ORL=>24dB
Tc=-20 to +65°C
33
-
-
-
-
10
3.5
-
25
Limits
Type
-
-
-
-
-
-
1.4
12
Note (4)
38
0.05
90
90
50
-
-
-
35
-
0.10
125
125
-
-
-
-145
-
Unit
°C
V
mA
mA
dB
dBm
V
dB
nm
dB
nm
ps
ps
Ω
dB
GHz
dB/Hz
dB
OPTICAL & ELECTRICAL CHARACTERISTICS (TL= Tset, Tc = 25°C, BOL, unless otherwise specified)
Parameter
Laser Set Temperature
On Level Modulation
Threshold Current
Operating Current
Dispersion Penalty
Optical Output Power
Forward Voltage
Extinction Ratio
Peak Wavelength (Note 4)
Sidemode Suppression Ratio
Spectral Width
Rise Time
Fall Time
Input Impedance
RF Return Loss
Cut-off Frequency
Relative Intensity Noise
Optical Isolation
Symbol
Tset
Vo
Ith
Iop
dP
Pf
VF
Rext
λ
p
SSR
∆λ
Tr
Tf
Z
S11
S21
RIN
Is
Min.
+15
-1
2
40
-
0
-
10
Max.
+35
0
40
90
1.5
-
2.0
-
Note (1) Eudyna Test System
23
2.48832Gb/s, PRBS=2 -1, Ib=Iop, Vm=Vo/(Vo-2)
Dispersion = 10,000ps/nm
-10
Dispersion penalty at bit - error - rate = 10
Note (2) Eudyna Test System
23
2.48832Gb/s, PRBS=2 -1, Ib=Iop, Vm=Vo/(Vo-2)
Note (3) Spectrum measurement equipment is "Monochrometer"
or "Fabry-Perot Etalon".
Spectral width at -20dB under the modulation condition of Note (2)
Note (4) The selected wavelengths available are listed in Fig. 9.
3
FLD5F14CN-E
Fig. 1 Lasing Spectrum
2.5 Gb/s
PRBS=2
23
-1
IF=Iop
Vm=Vo/(Vo-2)
1,550nm Modulator
Integrated DFB Laser
Fig. 2 Lasing Spectrum
2.5 Gb/s
PRBS=2
23
-1
IF=Iop
Vm=Vo/(Vo-2)
5.5 GHz
(0.045nm)
Wavelength (Span=1 GHz/div, Res.=100 MHz)
Relative Intensity (10 dB/div.)
Relative Intensity (5 dB/div.)
Wavelength (Span=1 nm/div, Res.=0.1nm)
Fig. 3 Temperature Dependance of
Wavelength (ACC)
1555
IF=Iop
Vm=Vo
1554
Wavelength (nm)
1553
1552
1551
1550
10
Fig. 4 Forward Current vs. Output Power and
Forward Current vs. Forward Voltage
4
4
Vm=Vo
TL=+25°C
3
3
2
Pf
VF
2
1
1
20
30
40
0
0
30
60
0
90
Laser Temperature, TL (°C)
Forward Current, IF (mA)
4
Forward Voltage,VF (V)
Output Power, Pf (mW)
1,550nm Modulator
Integrated DFB Laser
Fig. 5 Extinction Ratio
vs. Modulation Voltage
0
12
9
6
3
0
-3
-6
-9
-12
0
-25
0
0.5
1.0
1.5
2.0
2.5
FLD5F14CN-E
Fig. 6 Cut-off Frequency (S21)
Minus Extinction Ratio (dB)
-5
-10
-15
-20
Relative Output (dB)
2
4
6
8
10
Frequency (GHz)
Modulation Voltage (V)
Fig. 7 RF Return Loss (S11)
Fig. 8 Transmission Characteristics
10
-4
Return Loss (dB)
20
15
10
5
0
-5
-10
-15
-20
0
2
4
6
8
10
10
-12
-35
Bit Error Rate
2.48832Gb/s
PRBS=2
23
-1
0 km
10,000ps/nm
10
-6
10
-8
10
-10
Frequency (GHz)
-30
-25
Average Received Optical
Power (dBm)
5
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