Exfo IQS-12004B DWDM Passive Component Test System for Manual do Utilizador descarregar pdf (Página 420)

100

101

Definitions and Calculation Methods

408 IQS-12004B

Bandwidth (nm)

Bandwidth is the spectral width over which the transmission of the device

exceeds some stated loss value. The system can measure bandwidth at

three different power levels, called BW1, BW2, and BW3, relative to the

peak power level, as illustrated in the following diagram.

These levels are configurable by the user, but they are given the default

values of 1.0 dB, 3.0 dB, and 20.0 dB.

³ A BW1 bandpass filter (at 1.0 dB or 0.5 dB) is commonly referred to as

the passband or operating wavelength range of the device.

³ BW2 (at 3 dB) is the half-power bandwidth.

³ BW3 (at 20 dB or higher) is often used to describe the rejection or

isolation band. The BW1/BW3 ratio can be used as an indicator of

the filter shape.

IMPORTANT

The application uses BW1 for a number of calculations (IL, ripple,

and crosstalk), and the results will depend on the selected method.

Increasing loss

1.0 dB bandwidth (BW1)

3.0 dB bandwidth (BW2)

20.0 dB bandwidth (BW3)

Wavelength

1 2 ... 415 416 417 418 419 420 421 422 423 424 425 ... 436 437

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