8163A/B, 8164A/B, 8166A/B User’s Guide 143Tunable Lasers 5How to Set the WavelengthThere are three ways to set the wavelength of the Tunable Laser.• You can set the wavelength (λ) directly,• You can set the wavelength from a base wavelength and an offset in thefrequency domain, or• You can set a wavelength range for the instrument to “sweep”.Wavelength RangeEvery Tunable Laser module has a specified wavelength range. This rangeis available for all Tunable Laser modules. See the "Specifications" chapterof your Tunable Laser User’s Guide to find your module’s specified range.Every Tunable Laser module has a permitted wavelength range. This rangeis greater than the specified range. The permitted wavelength range variesfor each Tunable Laser module. You can set the wavelength to any valuewithin the permitted wavelength range.Figure 82 on page -143 shows an example of specified and permittedwavelength range.Figure 82 Specified and Permitted Wavelength RangeHow to Set the Wavelength DirectlyYou can set a constant wavelength.To set the wavelength to 1545.500 nm:1 Move to the Tunable Laser channel.2 Move to the wavelength parameter, [λ], and press Enter.3 Enter 1545.500 and press Enter.l [nm]Specified RangePermitted Range1460 1580 16001450Not to Scale
