Agilent-technologies 83438A Manual de usuario descargar pdf (Pagina 23)

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Making Measurements

Performing Stimulus-Response Measurements

This section shows you how to perform stimulus-response measurements. The

combination of using the Agilent 83438A for broadband stimulus and the opti-

cal spectrum analyzer for selective response provides the following benefits:

• All wavelengths are available simultaneously

• Fast measurement speeds

• Small coherence length

• High dynamic range and high resolution

Measurements for DWDM systems

The following figure shows a system which is well suited for characterizing

dense wavelength-division multiplexed (DWDM) components. Because of the

high-power density of the Agilent 83438A, you can easily characterize such

items as the crosstalk of dimultiplexers and the reverse path of optical isola-

tors.

The polarization controller is used to characterize polarization dependencies

of a device. For example, the center wavelength shift or the polarization

dependent loss of a demultiplexer. If your instrument has Option 009 installed,

it contains a built-in polarizer.

Increasing wavelength accuracy

When measuring deep-notch filters, increased absolute wavelength accuracy

may be required. To increase wavelength accuracy, the combination of an

Agilent 8168E/F tunable laser source and the Agilent 86120A multi-wave-

length meter can be used to calibrate the optical spectrum analyzer. Simply

enter the difference between the two wavelength readings (optical spectrum

analyzer and multi-wavelength meter) into the optical spectrum analyzer as a

correction factor. Refer to the user’s guide for the optical spectrum analyzer to

learn how to enter correction factors. If you use this technique, be aware that

the Agilent 8168E/F measures wavelength in a vacuum and the optical spec-

trum analyzer measures wavelength in air unless you change its settings.

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Agilent-technologies 83438A Manual de usuario Pagina 23