Exfo PSO-100 Series Optical Sampling Oscilloscopes Bedienungsanleitung PDF herunterladen (Seite 113)

Optical Sampling Oscilloscope 105

B Burst Mode Measurements

The burst mode is very useful for example in circulating loop experiments.

For this function to work, you must have the external clock option.

In the figure below, we see an example with 42.3 Gb/s NRZ data

modulation that come in bursts from a circulating loop.

The first acousto-optic modulator (AOM) chops the data into bursts with a

duration to exactly fill the loop (in this case 31.3 km of fiber). The AOM

inside the loop is used for emptying the loop after N circulations, when a

new burst is injected into the loop.

In this way, a near continuous data stream is circulating in the loop. The

output signal from the loop constitutes of bursts originating from

circulation number 1,2,…,N. With the last AOM, you select which

circulation to monitor. The signal frequency (or sub-rate) clock (in this

case from the clock recovery circuit) is inserted on the external clock input

and the optical signal from the loop is inserted to the sampler.

Clock and

Data Recovery

(CDR)

EDFA

10 GHz clock

Optical

bandpass

filter

AOM

10 %

27 km SMF

40 Gb/s

Receiver

Driver Amplifier

Roundtrip

selector

Laser

1550 nm

Empty loop

EDFA

Chop data

into bursts

4.3 km DCF

Optical

bandpass

filter

AOM

10 %

10 GHz clock

40 Gb/s output

Agilent ParBERT 81250

Pattern Generator

Mach-Zender

modulator

EDFA

1 2 ... 108 109 110 111 112 113 114 115 116 117 118 ... 139 140

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