EXFO FTB-5500B PMD Analyzer - Manual (Page 114)

Using Third-Party Broadband Light Sources
106 FTB-5500B
Uncertainty Formula
Note: Continuous random I/O-SOP scrambling can also be performed without
any synchronization with the instrument scans. Automatic, polarization
scramblers/controllers running continuously with time are inserted at the
input and output of the DUT (only one of these is not enough). The
bandwidth of the SOP scramblers must be at least a few Hz to ensure very
effective scrambling, and limited to a few kHz in order not to impair the
normal operation of the analyzer.
Note: The rms width of the auto-correlation interferogram, E(τ) is defined as
follows:
Equation 5
σ
0
τ
2 ∫
E τ ( ) τ d ⋅ ⋅
E τ ( ) τ d ⋅
∫
--------------------------------- ≡