L A S E R D I O D E
Laser diode
L8231/L7551 series
Receptacle type, 1.3 µm, 1.25, 2.5 Gbps
L8231 and L7551 series are high-speed infrared emitters specifically developed for 1.3 µm band optical fiber communications. These devices
incorporate a high-speed Fabry-Perot laser diode integrated in a receptacle module. Packages are available with various connectors and
mounting styles.
Features
Applications
High-speed Fabry-Perot laser diode
L8231 series: 1.25 Gbps
L7551 series: 2.5 Gbps
Optical fiber communications
Fiber channel
Gigabit ethernet
HDTV
Compatible with single/multi mode optical fibers
SDH
ꢀ Absolute maximum ratings (Ta=25 °C)
Parameter
Symbol
L8231 series
L7551 series
Ith + 16 (DC)
Unit
mA
mA
V
V
°C
°C
Ith + 14 (DC)
Forward current
IF
Ith + 28 (pulse) *1
Ith + 32 (pulse) *1
Reverse voltage (laserdiode)
Reverse voltage (photodiode)
Operating temperature
Storage temperature
VR
2
20
VRm
Topr
Tstg
-20 to +70
-40 to +70
*1: Duty ratio 50 %
ꢀ Electrical and optical characteristics (Typ. Ta=25 °C, IF=Ith +10 mA)
Parameter
Peak wavelength
Forward voltage
Threshold current
Fiber end output *2
Rise time
Symbol
L8231 series
L7551 series
Unit
µm
V
mA
mW
ps
Gbps
mA
1.31
1.1
6
0.2
250
1.25
0.4
1.31
1.1
9
0.2
200
2.5
0.5
λp
VF
Ith
PF
tr
Data rate
B
Monitor current (photodiode)
Im
*2: Measured using a single-mo de optical fiber (mode field diam eter 9.5 µm) w ith a master plug.
ꢀ Package lineup
L8231/L7551
Parameter
-21
-22
Board
FC
-23
-32
Panel
FC
-44
Mounting style
Connector
Board & panel
SC
MU
LC
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Dimensional outline
1