Atec Anritsu_MS9720A - Manual (Page 5)

5
Insertion Loss Measurement
Isolation Measurement
By using the same setup, it is possible to measure the opti-
cal leakage between each channel of an optical coupler and
to measure the isolation. Moreover, when used in combina-
tion with an external light source, it is possible to measure
the directivity to evaluate the very weak optical leakage
between send and receive channels.
Return Loss Measurement
When the MS9720A is combined with the dedicated
MN9604C Optical Directional Coupler (sold separately) and
the total reflection optical fiber (sold separately), the return
loss can be measured.
The following screens show a measurement of the reflection
at the fiber input end (open) using a four-wave WDM light
source as the external light source.
DUT
Total reflection
optical fiber for
reference
MN9604C Optical
Directional Coupler
Built-in SLD or
external light
source
MS9720A
External light
COM
Tx1
Rx2
Tx3
Rx4
Tx5
Rx6
Tx7
Rx8
MS9720A
COM
Tx1
Rx2
Tx3
Rx4
Tx5
Rx6
Tx7
Rx8
MS9720A
Help Function
All the measurement procedures and set ups for applica-
tions are explained by easy-to-understand diagrams that are
displayed by pressing the Help key.