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3-12 Measuring Laser Separation
Measuring Laser Separation
To measure channel separation 3-13
You can use relative power measurements to measure
flatness (pre-emphasis) in a WDM system. Simply
select one carrier as the reference and measure the
remaining carriers relative to the reference level. The
power difference represents the system flatness.
It is often important to measure the wavelength and
power separation between multiple laser lines. This is
especially true in wavelength-division-multiplexed
(WDM) systems where channel spacing must be
adhered to. The WDM channel analyzer can display the
wavelength and amplitude of any laser line relative to
another. In fact, the following types of relative measure-
ments can be made compared to the reference:
• Relative wavelength, absolute power
• Relative power, absolute wavelength
• Relative wavelength and power
Suppose you want to measure separation on a system
having the spectrum shown in the following figure.
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