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Low-Noise DFB Laser System
1.4.2
Graphs
The Lorentzian / instantaneous linewidth may be estimated from the high-frequency white noise level of the noise
plot, according to:
where the white noise level is measured in hertz/sqrt(hertz). The linewidth at longer integration times may be
estimated using the method described in:
Gianni Di Domenico, Stéphane Schilt, and Pierre Thomann, "Simple approach to the relation between laser
frequency and laser line shape", Applied Optics, vol. 49, no. 25, pp. 4801 - 4807, 2010.
Page 4
DFB13TK Relative Intensity Noise (RIN)
-90
-110
-130
-150
-170
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2
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Figure 1
Typical Low-Frequency Relative Intensity Noise (RIN)
DFB13TK Frequency Noise Spectral Density
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10
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10
2
10
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Figure 2
Lorentzian Linewidth = π × (White Noise Level)
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10
10
10
Frequency (Hz)
106 kHz Linewidth
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5
10
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10
10
Frequency (Hz)
Example Frequency Noise
Chapter 1: Introduction
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10
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2
,
TTN339662-D02
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