
MITSUBISHI LASER DIODES
ML9XX31 SERIES
InGaAsP DFB-LASER DIODE WITH EA MODULATOR
TYPE 
NAME
ML9SM31 
DESCRIPTION 
ML9XX31 series are DFB (Distributed Feedback) laser diodes with a 
monolithically integrated EA modulator, suitable light source for 10Gbps 
or 2.5Gbps application (Single channel / DWDM).  
Available wavelengths are from 1530nm to 1565nm with 0.8nm spacing. 
ML9SM31 is supplied with the chip-on-carrier type package.  
FEATURES 
 Available distance  
ML9SM31-01 series : 50km(Max) at 10Gbps  
ML9SM31-02 series : 700km(Max) at 2.5Gbps  
 High extinction ratio (Min. 11dB at 2.5Gbps, Typ. 11dB at 10Gbps)
 High - side mode suppression ratio (Typ. 40dB) 
 High speed response (Typ. 30psec) 
APPLICATION 
2.5Gbps long-haul transmission system 
10Gbps transmission system 
ABSOLUTE MAXIMUM RATINGS 
Symbol 
I
F
V
RL
V
EA
Tc 
Tstg 
Parameter 
Conditions 
CW 
- 
- 
- 
- 
Ratings 
200 
2 
-3 
+15 to +35 
-40 to +100 
Unit 
mA 
V 
V 
degC 
degC 
Forward current (Laser diode) 
Reverse voltage (Laser diode) 
Reverse voltage (Modulator) 
Case temperature 
Storage temperature 
ELECTRICAL/OPTICAL CHARACTERISTICS (Tc=25degC) 
Symbol 
Parameter 
Ith 
Threshold current 
Iop 
Operation current 
Vop 
Operating voltage 
λ
p 
Peak wavelength 
θ
//
Beam divergence angle (parallel) 
Beam divergence angle  
(perpendicular) 
Pm 
Test Conditions 
Min. 
--- 
--- 
--- 
-0.4 
--- 
Typ. 
10 
60 
1.2 
code list
30 
Max. 
30 
90 
1.8 
+0.4 
--- 
Unit 
mA 
mA 
V 
nm 
deg. 
CW, Vmod=0V 
CW, Po=5mW, Vmod=0V 
CW, Po=5mW, Vmod=0V 
CW, If>Iop, Vmod=0V 
CW, Po=5mW, Vmod=0V 
θ⊥ 
CW, Po=5mW, Vmod=0V 
--- 
45 
--- 
deg. 
CW, Po=5mW, Vmod=0V 
--- 
1.0 
--- 
mW 
ML9SM31-01 series for 10Gbps 
fc 
Cut off frequency 
tr,tf 
Rise and fall time (10%-90%) 
SMSR 
Side mode suppression ratio 
Ex 
Extinction ratio 
CW, If>Iop, Vmod=-1V 
9.95328Gbps, NRZ, PRBS 223-1 
If>Iop, Vpp=2.5V,  
Voffset=0 to -1.0V 
ditto 
SMF 50km @BER=10-10 
10 
--- 
35 
10 
14 
30 
40 
11 
--- 
40 
--- 
--- 
GHz 
psec 
dB 
dB 
Pp 
Dispersion penalty 
--- 
--- 
2.0 
dB 
ML9SM31-02 series for 2.5Gbps 
fc 
Cut off frequency 
tr,tf 
Rise and fall time (10%-90%) 
SMSR 
Side mode suppression ratio 
Ex 
Extinction ratio 
CW, If>Iop, Vmod=-1V 
2.48832Gbps, NRZ, PRBS 2
23
-1 
If>Iop, Vpp=2.5V,  
Voffset=0 to -1.0V 
ditto 
SMF 700km @BER=10
-10
4 
--- 
35 
11 
--- 
--- 
40 
--- 
--- 
120 
--- 
--- 
GHz 
psec 
dB 
dB 
Pp 
Dispersion penalty 
--- 
--- 
2.0 
dB 
MITSUBISHI
ELECTRIC
May 2004 
Notice: Some parametric limits are subject to change
.