Maximum Rf Modulation Frequency (Mhz) - Agilent Technologies 86038B User Manual

Maximum RF Modulation Frequency (MHZ)

Table 2-1. Maximum RF Modulation Frequency (MHz) for <90° phase steps
∆τ RGD
(ns/nm)
0.1
0.5
1
5
10
50
100
500
1000
5000
10000
50000
64
Diagnosing a phase wrapping error is not always easy, because
the extent to which phase wrapping affects the shape of the
measured relative group delay curve depends upon the details
of both the test device and the measurement setup parameters.
Be conservative in the use of
phase wrapping errors to go entirely unnoticed. In addition to
the display of maximum CD in the Sens/Res setup panel, Agilent
provides a similar calculation in an Excel spreadsheet
calculator for estimating the maximum allowable step size. It is
called the Wavelength Step Calculator for Modulation Phase
Shift CD Measurements and can be found in the Library section
of the public Agilent product web page for the 86038B.
The following table lists recommended modulation frequencies.
Any modulation smaller than that listed will give correct results
(that is, no phase wrapping). Smaller modulation frequencies
will have more noise and better resolution. Table cells that have
an arrow symbol ( ) indicate that you must decrease the
wavelength increment to achieve the desired ∆τ RGD.
∆λ Wavelength Increment (nm)
0.001 0.005 0.01
any any any
any any any
any any any
any any any
any any 2500
any 1000 500
2500 500 250
500 100 50
250 50 25
50 10 5
25 $
5
5 $ $
Equation
f
0.05 0.1
any any
any any
any 2500
1000 500
500 250
100 50
50 25
10 5
5 $
$ $
$ $
$ $
Agilent 86038B Photonic Dispersion and Loss Analyzer, Second Edition
6, as it is possible for
1 ⁄ 4 × Δτ × Δλ
f =
=
90
90
0.5 1 5
any 2500 500
1000 500 100
500 250 50
100 50 10
50 25 5
10 5 $
5 $ $
$ $
$ $ $
$ $ $
$ $ $
$ $ $