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Frequency and Intensity Noise of Single Frequency Fiber Bragg Grating Lasers

✍ Scribed by Erlend Rønnekleiv

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
306 KB
Volume
7
Category
Article
ISSN
1068-5200

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✦ Synopsis

The relative intensity (RIN) and optical frequency (ν rms ) noise of Er-doped fiber Bragg grating lasers are investigated theoretically and experimentally. For a 1480-nm pumped fiber distributed feedback (DFB) laser with 170-µW output power we observe a typical RIN floor of -118 dB Hz/ √ Hz for frequencies above 10 Hz, with a strong relaxation oscillation resonance peak at 222 kHz reaching -77 dB Hz/ √ Hz. ν rms ranges from 26 dB Hz/ √ Hz at 1 kHz to 2 dB Hz/ √ Hz at 1 MHz, with a sharp peak at the relaxation oscillation frequency. Below 1 kHz 1/f noise is observed in ν rms . Negative feedback to the pump laser from the fiber laser output power is found to eliminate the relaxation oscillation noise peaks both from RIN and ν rms spectra. By comparing measured intensity and frequency fluctuations at the relaxation oscillation frequency, we estimate the linewidth broadening factor of two investigated lasers to be 2.1 and 3.6, as compared to typically between 3 and 7 for semiconductor lasers.

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