Anritsu MS9740B - Measuring DFB-LD (Distributed Feedback Laser Diode)

5.1 Measuring DFB-LD (Distributed Feedback Laser Diode)
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Measurement Functions
5.1 Measuring DFB-LD (Distributed Feedback Laser
Diode)
A DFB–LD is a semiconductor laser diode that generates a single
spectrum.
The following items can be measured by the DFB-LD measurement
functions.
● Peak: Peak wavelength and peak level
● 2nd Peak: Side mode wavelength and level
● SMSR: Side Mode Suppression Ratio
● Mode Offset: Difference between side mode wavelength and
peak wavelength
● Stop Band: Difference between peak wavelength and both
side mode wavelengths
● Center Offset: Difference between peak wavelength and
average of both side mode wavelengths
● σ: Standard deviation
● Kσ: Spectrum width using RMS method
● ndB Width: Spectrum width at specified cut level
Figure 5.1-1 DFB-Test Example