Exfo FTB -5240S/5240BP Optical Spectrum Analyzer for FT Instrukcja Użytkownika Pobierz pdf (Strona 303)

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Managing Results

Optical Spectrum Analyzer 295

Managing WDM Test Results

³ Noise for OSNR: indicates which calculation method to use for OSNR

value.

Fixed range IEC based (IEC): The IEC method uses the interpolation

of noise measured on both sides of the signal to estimate the noise

level. The position at which the noise is estimated from the center

wavelength is given by the OSNR distance.

In-Band (InB): The In-Band method uses a series of scans having

different polarization states to calculate the noise level in band.

In-Band narrow filter (InB nf): The In-Band narrow filter method

uses the In-Band method with additional processing to provide an

accurate OSNR value for the narrow carved noise. This is because with

narrow filters, the noise level under the peak is not uniform and the

OSNR value depends on the processing width selected.

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Exfo FTB -5240S/5240BP Optical Spectrum Analyzer for FT Instrukcja Użytkownika Strona 303

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