GP1FB201RK
Fig.3 Measuring Method of Jitter
Fiber optic cable
Standard transmitter
GP1FB201RK Unit to be measured
GND Vout
VCC
Vin
VCC GND
VCC
2.5V
Oscilloscope
CH1
Input
Tektronix7834
or 7934 type
Trigger : CH1
Storage mode
CH2
Input signal 3Mbps
Sweep : AUTO/NORM
biphase PRBS signal
Test item
Input signal
Test item Symbol
Test condition
50%
50%
Set the trigger on the rise of input signal
to measure the jitter of the rise of output
Jitter
Jitter
∆tj
∆tj
Set the trigger on the fall of input signal
to measure the jitter of the fall of output
GP1FB201RK
Notes (1) The fiber coupling light output set at −14.5dBm/−24.0dBm.
(2) The ocsilloscope is set on storage mode and write time shall be 3 seconds. But
do not allow the waveform to be distorted by increasing the brightness too much.
(3) VCC=2.5±0.05V (State of operating)
output
(4) The probe for the oscilloscope must be more than 1MΩ and less than 10pF.
∆tj
∆tj