Exfo FTB -5240S/5240BP Optical Spectrum Analyzer for FT Uživatelský manuál stáhnout pdf (Strana 71)

100

101

Setting Up the Instrument in WDM Mode

Optical Spectrum Analyzer 63

Setting Up WDM Analysis Parameters

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 under the

peak (In-Band).

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

uses 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.

4. Under Global analysis parameters, define the following parameters

as needed:

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Exfo FTB -5240S/5240BP Optical Spectrum Analyzer for FT Uživatelský manuál Strana 71

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