2

SWS directly measures IL, PDL and average loss as a function of wavelength. RL

is measured with the optional RL modules (SWS20005). Using the raw IL and

PDL data, the application software provides a comprehensive set of analysis tools

that calculate:

• Loss at peak

• Center wavelength, from x dB threshold

• Loss at center wavelength

• Bandwidth at x dB threshold

• Crosstalk, left/right and cummulative

• Flatness

These parameters are calculated relative to the measured peak, ITU grid or user-

defined grid.

The SWS is delivered with a set of DLLs that can be used to develop software to

suit custom testing requirements. The DLLs function through the SWS receiver

hardware, allowing access to all SWS functionality. Using the supplied

DLLs, applications may be developed in Visual Basic

LabView environments.

With a 4-State polarization controller located within the SOM, PDL and average

loss are measured quickly as a function of wavelength. Four polarization states at

0°, 90°, - 45° and circular polarization are measured, and the Mueller matrix

analysis is used to accurately determine PDL at all wavelengths scanned.

When the very highest accuracy PDL measurements are required, a special version

of the detector module should be used. The SWS15107-A contains specially

selected and tuned components to allow PDL measurement to an accuracy of

better than ± 0.01 dB. This module is supplied with a fixed FC/APC connector.

All specifications listed are met simultaneously. No change in wavelength accuracy

(± 2 pm) or scan speed (20 nm/s) is required to obtain a 70 dB dynamic range.

SWEPT WAVELENGTH SYSTEM (SWS2000)

Continued

Typical Application of SWS2000