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PRODUCT INFORMATION
840nm
2B455
VCSEL Laser Diode
Datacom
This Vertical Cavity SurfaceEmitting Laser is designed for Fibre Channel, Gigabit Ethernet, ATM and general applications. It incorporates a photodiode to monitor the optical power and allow for feedback control.
Optical and Electrical Characteristics
PARAMETER SYMBOL MIN. TYP . MAX. UNIT
(25 C Case Temperature) TEST CONDITION
Fiber-Coupled Power Optical Power Slope Efficiency
(dPo/dIF)
Pfiber Po
1.3 0.9 1.7 200 15 3.0
mW mW
IF =12mA IF =12mA
(Note 1)
mW/A IF =12mA deg GHz 860 1 2.2 6 nm nm V mA A 30 nA IF =12mA, VR>1V VR=5V Full Width at 1/e2 IF =12mA IF =12mA IF =12mA IF =12mA
Beam Divergence Bandwidth
(3dBel )
fc
p
2 830 840 0.5
Peak Wavelength Spectral Width (FWHM) Forward Voltage (Fig.5) Threshold Current Monitor Current Monitor Dark Current Relative Intensity Noise
VF Ith Im Id RIN 20
1.9 3.5 30
-130
dB/Hz IF =12mA, f=1 GHz
Note 1: Fiber: 50/125 Graded Index, NA=0.2 or 62.5/125 Graded Index, NA=0.275. An external glass ball lens with 2 mm diameter is required.
O4.7 O2.55
Absolute Maximum Ratings
PARAMETER SYMBOL LIMIT
3.575
Storage Temperature Operating Temperature (derating: Fig.4)
14
Tstg Top Ptot IF IFRM VR Tsld
-55 to +125 C 0 to +70 C 35 mW 15 mA 25 mA 1.5 V 260 C
Electrical Power Dissipation (derating: Fig.4)
0.4
VCSEL Cathode MONITOR Anode
Continuous Forward Current (f Peak Forward Current (duty cycle
All dimensions in mm
10 kHz) 50%, f 1 MHz)
VCSEL
Anode
MONITOR
Cathode
VCSEL Reverse Voltage Soldering Temperature (2mm from the case for 10 sec)
2.5 5.47 CASE NOT CONNECTED
BOTTOM VIEW
Thermal Characteristics
PARAMETER SYMBOL MIN. TYP. MAX. UNIT
TO-46 Package With Flat Window
Thermal Resistance - Infinite Heat Sink
WARNING: Laser Radiation, avoid exposure to beam. Class 3B laser product, potential eye hazard. Warning labels in each box.
Rthjc Rthja d /dTj P Ith
500 800 0.06 0.7 0.6
C/W C/W nm/ C dB mA
Thermal Resistance - No Heat Sink Temp. Coefficient -W avelength Optical Power - Variation 0 to 70 C
13590.11 1999-04-01
Threshold Current - Variation 0 to 70 C
Europe: Tel (46) 8 58 02 45 00 Fax (46) 8 58 02 01 10 Tel (44) 1291 436180 Fax (44) 1291 436771
America: Tel 1-800-96MITEL Fax (613) 592-6909 Asia: Tel (65) 293 5312 Fax (65) 293 8527
VCSEL Laser Diode
2B455
840nm
%
120
Po vs T FIGURE 1
RELATIVE THRESHOLD CURRENT
%
120
Ith vs T FIGURE 2
%
100
FIGURE 3 Po vs If
100
100
80
RELATIVE OPTICAL POWER
80
80
RELATIVE OPTICAL POWER
0 20 40 60 80 100 C
60
60
60
40
40
40
20
20 0 20 40 60 80 100 C
20
0 0 4 8 12 16 20 mA
OPERATING TEMPERATURE
OPERATING TEMPERATURE
FORWARD CURRENT
mA
20
If
vs
Vf
MAX. ELECTRICAL POWER DISSIPATION
mW
50
FIGURE 5 Pel vs T
40
INFINITE HEAT SINK
FORWARD CURRENT
30
10
20
NO HEAT SINK
10
0 0 1 2 3V
0 0 20 40 60 80 100 C
FORWARD VOLTAGE
OPERATING TEMPERATURE
% 100
FIGURE 4 Po vs U
Functional Schematic
VCSEL CATHODE COMMON WITH MONITOR ANODE
RELATIVE OPTICAL POWER
50
VCSEL
MONITOR
VCSEL ANODE
MONITOR CATHODE
0 -15
-10
-5
0
+5
+10
+15
EMISSION ANGLE
FUNCTIONAL SCHEMATIC
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