Exfo FTB-5500B PMD Analyzer Manual do Utilizador descarregar pdf (Página 113)

Using Third-Party Broadband Light Sources

Polarization Mode Dispersion Analyzer 105

Uncertainty Formula

The following formula can be used to determine the mean uncertainty as a

function of the auto-correlation rms width, , the measured PMD value,

and the number of measurements performed with distinct I/O-SOPs (using

scramblers at the input and output of the DUT),

³ all cases:

Equation 4

³ large PMD:

when

Note: The uncertainty on the mean-PMD is decreased considerably when

performing a sufficient number N of measurements with distinct I/O-SOPs.

For randomly distributed I/O-SOPs, the uncertainty is decreased by a factor

of according to Equation 3 on page 104. However, using an

appropriate, deterministic set of I/O-SOPs covering the Poincaré sphere

with a regularly spaced grid, the improvement factor tends toward

instead, which is much more efficient.

PMD

--------------

----

3π

------

–

⎝⎠

⎛⎞

---

PMD

-------------

⎝⎠

⎛⎞

⋅+

------------------------------------------

⋅=

PMD

--------------

----

PMD

-------------

⋅

0.55

∼

PMD

-------------

1»

1N⁄

1 2 ... 108 109 110 111 112 113 114 115 116 117 118 119 120 121

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