Using the Optical Spectrum Analyzer

The System Menus

Note

The optical spectrum analyzer compensates for temperature-related current drift between each sweep. Although this “zeroing” increases amplitude accuracy, it increases the time between sweeps. If amplitude accuracy is not critical to your measurement, you can turn off zeroing. Refer to “Auto Zero” on page 3-12for additional information.

The optical spectrum analyzer performs a more complete zeroing when the instrument is first turned on. You can run this more complete routine anytime by pressing the ZERO NOW softkey.

To set the grating order mode

1Press the front-panel System key.

2Press the More System Functions.... softkey.

3Press the Service Menu.... softkey.

4Press the Adv Service Functions.... softkey.

5Press the Grating Order softkey.

6Toggle between 1 and AUTO.

The Grating Order function lets you choose between 1st order grating only and the Automatic setting. The Automatic mode selects 2nd order mode if the stop wavelength is less than 900 nm. The 2nd order grating mode provides a slightly higher measurement sensitivity. Note that the 10 nm resolution bandwidth is not available when using the 2nd order grating mode. The grating order is listed in the OSA State Information. See “To display the OSA State information panel” on page 3-47for more information.

To set the wavelength limit

1Press the front-panel System key.

2Press the More System Functions.... softkey.

3Press the Service Menu.... softkey.

4Press the Adv Service Functions.... softkey.

3-51