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Operation
Applications
Figure 4-5
shows the Bessel-function nature of the modulated DFB laser. Null-
ing the first or second Bessel sideband-occurring at FM modulation indexes of
2.4 and 3.8, respectively—allow full FM characterization of the single-line
laser. Note that the width of each sideband is the linewidth of the laser. Thus,
linewidth can be viewed with laser modulation away from the 0 Hz axis.
Figure 4-5. FM Sidebands Shown by Low-Level Chirp
(Modulation frequency = 500 MHz)
4-7
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