Measurement capabilities
3dB cut-off frequency (S21),
Responsivity (S21),
Electrical reflection (S11 or S22),
Group Delay vs. frequency,
Insertion Loss (IL),
Transmission bandwidth,
all electrical S-parameter measurements.
Target test devices
Transmitter (E/O)
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Receiver (O/E)
PIN diodes
Avalanche photodiodes (APD)
Receiver optical subassemblies (ROSA)
Optical (O/O)
Passive optical components
Optical fibers and filters
Optical transmission systems
Agilent N4375B Specifications
Measurement conditions
Modulation frequency range from 10 MHz to 20.0 GHz
Foreward RF power +5 dBm,
option -312, -314, -392, -394
Foreward RF power +3 dBm, option -322, -382
Reverse RF power 0 dBm
Number of averages: 1
100 Hz IFBW (“Reduce IF bandwidth at low frequency”
enabled) with modulation frequency step size 10 MHz
and measurement points on a 10 MHz raster (if not
differently stated)
Network analyzer set to “stepped sweep – sweep
moves in discrete steps”
All network-analyzer ports configured in standard
coupler configuration (“CPLR ARM” to “RCVB B in”,
“SOURCE OUT” to “CPLR THRU”)
After full two-port electrical calibration using an
Electronic Calibration Module, Agilent N4691B, at
constant temperature (±1° C)
Modulator bias optimization set to “every sweep”
Measurement frequency grid equals electrical
calibration grid
DUT signal delay ≤ 0.1/IF-BW
Specified temperature range: +20° C to +26° C.
After warm-up time of 90 minutes
Using high quality electrical and optical connectors
and RF cables in perfect condition
Using internal laser source
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