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Calibration System 57

A Calibration Methods

This chapter presents the methods, on which are based the procedures of

the IQS-12002B Calibration System., for the calibration of power meters

and OTDRs.

Power Meter

The calibration of a power meter includes the calibration of its absolute

power and, for a high-end unit (e.g., IQS power meter), the calibration of

its linearity.

Absolute Power Calibration

Power meter calibration is performed by comparing it with an

IQS-1502 Calibration Power Meter (working standard). Comparison

between the two is done by measuring the output power of a laser source,

such as the IQS-2400 (usually a DFB laser), having excellent wavelength

and power stability.

In order to improve accuracy, the system can integrate a polarization

scrambler, which reduces the uncertainty due to the polarization

dependant response (PDR) of photo detectors.

For calibration at the 850-nm wavelength, the IQS-2400 uses a stabilized FP

laser with the mandatory mode scrambler in order to obtain a stable laser

source.

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Exfo IQS-12002B Calibration System Manuale Utente Pagina 61