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Operation
Applications
Figure 4-2. DFB Linewidth Measurement with Agilent 71400C
Chirp and FM Measurements
Figure 4-3
shows the experimental setup for chirp or FM measurement. The
presence of the gate function allows for the continuous addition of the laser in
its modulated and unmodulated states at the optical detector in a lightwave
signal analyzer. This results in the display of the homodyne spectrum of the
optical electric field.
Figure 4-4
shows a chirp measurement using this tech-
nique. This DFB laser chirped ±10 GHz under the applied 100 MHz sinusoidal
modulation. Note that, with the laser acting as a local oscillator, the minimum
optical resolution bandwidth of the measurement is limited by the laser line-
width, as shown in
Figure
4-5.
Equipment
Lightwave signal analyzer . . . . . . . Agilent 71400C (shown) or Agilent 83810A
Synthesized sweeper . . . . . . . . . . . . . . . . . . . . Agilent 8340/41 or Agilent 83620
Function generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Agilent 3312A
4-5
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