High Speed 850nm VCSEL
Transmission Over Multimode Fiber
W.L. Gore & Associates
Frank Peters
Dave Welch
Mark Donhowe
Lucent Technologies
Giorgio Giaretta
Paul Kolesar
IEEE 802.3
Higher Speed Study Group
July ‘99
Project Objective
Evaluate the Performance of Gore High
Speed 850 nm VCSELs with Lucent
High Bandwidth Multimode Fiber
IEEE 802.3
Higher Speed Study Group
July ‘99
Gore High Speed 850 nm VCSELs
VCSEL Characteristics
12.5 Gb/s Eye Pattern
1.5
3
1
2
1.5
0.5
1
Voltage (V)
Output Power (mW)
2.5
0.5
0
0
0
5
10
15
20
25
Current (mA)
IEEE 802.3
Higher Speed Study Group
July ‘99
High Bandwidth Fiber Test Schematic
Pulse Pattern
Generator
2^7-1 PRBS
2200 MHz-km Fiber Lengths
Bias-T
300 m
25 m
75 m
Photoreceiver
Current
Source
Microwave
Probe
VCSEL
Wafer
Fiber
Probe
1 m Std
50 Micron
Fiber
IEEE 802.3
Higher Speed Study Group
July ‘99
High Speed
Oscilloscope
10 Gb/s Eye Patterns
Gore 850 nm VCSELs with
Lucent high bandwidth fiber
1 meter length
300 meter length
IEEE 802.3
Higher Speed Study Group
July ‘99
400 meter length
12.5 Gb/s Eye Patterns
Gore 850 nm VCSELs with
Lucent high bandwidth fiber
1 meter length
300 meter length
IEEE 802.3
Higher Speed Study Group
July ‘99
400 meter length
Conclusions
l
l
l
12.5 Gb/s Multimode Transmission Over
Reasonable Distances with 850 nm VCSELs
is Feasible
Transmission Distance of 400 Meters Has
Been Demonstrated at 12.5 Gb/s
More Work is Needed to Determine Robust
Bandwidth*Distance Performance
IEEE 802.3
Higher Speed Study Group
July ‘99