EXFO PSO-100 Series Optical Sampling Oscilloscopes - Manual (Page 47)

Setting up and Using the Optical Sampling Oscilloscope
Optical Sampling Oscilloscope 39
Selecting Sync Format
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The DPSK (differential phase-shift keying) formats selection (PSO-102
model only) allow you to measure either RZ-DPSK or NRZ-DPSK
formats after a delay interferometer that is used to demodulate the
phase encoded data.
You can also select the balanced detection type for the two outputs
from the delay interferometer, with a manual delay on channel B to
make sure that the sampling occurs simultaneously on both channels.
This selection also applies to NRZ-DQPSK and RZ-DQPSK.
Note: In the case of the PSO-101, it is of course possible to look at a single-ended
detection of DPSK and DQPSK by measuring one output from the
demodulator, and then use the NRZ format for NRZ-DPSK (and
NRZ-DQPSK) and the RZ format for RZ-DPSK (and RZ-DQPSK).
To select a data format:
1. From the main window, select the Setup menu, then Sync Format.
2. From the list, select the desired format.