
MITSUBISHI LASER DIODES 
ML9XX40 SERIES 
Notice : Some parametric limits are subject to change     2.5Gbps 
InGaAsP DFB LASER DIODE 
Feb. 2005
MITSUBISHI 
ELECTRIC
TYPE 
NAME
DESCRIPTION 
ML9XX40 series are uncooled DFB (Distributed Feedback) laser  
diodes for 2.5Gbps transmission emitting light beam at 1470~1610nm. 
λ
/4 shifted grating structure is employed to obtain excellent SMSR 
performance under 2.5Gbps modulation. Furthermore, ML9xx40 can 
operate in the wide temperature range from 0
C to 85 
C without any 
temperature control. They are well suited for light source in long 
distance digital transmission application of coarse WDM. 
ABSOLUTE MAXIMUM RATINGS 
Symbol 
Parameter 
Po 
Output power 
If 
Forward current (Laser diode) 
V
RL
Reverse voltage (Laser diode) 
I
FD
Forward current (Photo diode) 
V
RD
Reverse voltage (Photo diode) 
Tc 
Case temperature 
Tstg 
Storage temperature 
ELECTRICAL/OPTICAL CHARACTERISTICS (Tc=25oC)
Symbol 
Parameter 
Ith 
Threshold current 
APPLICATION 
· 
2.5Gbps long-haul transmission 
·
 Coarse WDM application
FEATURES 
· 
λ
/4 shifted grating structure 
· 
Wide temperature range operation (0
o
C to 85
o
C) 
· 
High side-mode-suppression-ratio (typical 45dB) 
·
 High resonance frequency (typical 11GHz)
Conditions 
CW 
--- 
--- 
--- 
--- 
--- 
--- 
Ratings 
6 
150 
2 
2 
20 
0 to +85 
-40 to +100 
Unit 
mW 
mA 
V 
mA 
V 
oC 
oC 
Test conditions 
Min. Typ. Max.
--- 
10 
--- 
35 
--- 
45 
--- 
35 
--- 
70 
--- 
90 
--- 
1.1 
0.17 
0.22 
0.15 
0.20 
<*4>,<*5> 
35 
45 
--- 
45 
--- 
25 
--- 
30 
Unit 
CW 
CW 
Tc=85
oC
CW, Po=5mW 
CW, Po=5mW 
Tc=85
oC
CW, Po=5mW 
CW, Po=5mW 
CW, Po=5mW <*3> 
CW, Po=5mW 
CW, Po=5mW, Tc=0 to 85
oC
2.48832Gbps,Ib=Ith, Ipp=40mA 
CW, Po=5mW  
CW, Po=5mW 
15 
40 
50 
45 
80 
100
1.5 
--- 
--- 
<*1> 
<*2> 
mA 
<*1> 
<*2> 
Iop 
Operation current 
mA 
Vop 
Operating voltage 
V 
η 
Slope efficiency 
mW/mA
λ
p 
Peak wavelength 
Side mode suppression ratio 
Side mode suppression ratio(RF) 
Beam divergence angle (parallel) <*6>
(perpendicular) <*6> 
nm 
dB 
deg. 
deg. 
--- 
--- 
--- 
--- 
SMSR 
θ 
// 
θ
┴
fr 
Resonance frequency 
2.48832Gbps,Ib=Ith, Ipp=40mA 
2.48832Gbps,Ib=Ith, Ipp=40mA 
20%-80% 
CW, Po=5mW,VRD=1V,RL=10
V
RD
=5V 
V
RD
=5V 
--- 
11 
--- 
GHz 
tr,tf 
Rise and Fall time <*7> 
--- 
80 
120
ps 
Im 
Id 
Ct 
<*1> Applied to ML9xx40-04~09 and -12~17. 
<*2> Applied to ML9xx40-10~11 and -18~19. 
<*3> Applied to ML925J40F and ML920L40S.   
<*6> Beam divergence is not applied to ML925J40F and ML920L40S. 
<*7> Except influence of the 18mm lead. 
Monitoring output current (PD) 
Dark current (PD) 
Capacitance (PD) 
0.1 
--- 
--- 
--- 
--- 
10 
1.0 
0.1 
20 
mA 
μ
A 
pF 
ML925B40F / ML920J40S  
ML925J40F / ML920L40S