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. 2015 Jan 12;15(1):1342-53.
doi: 10.3390/s150101342.

Frequency noise suppression of a single mode laser with an unbalanced fiber interferometer for subnanometer interferometry

Radek Šmíd  1 , Martin Čížek  2 , Břetislav Mikel  3 , Ondřej Číp  4
Affiliations

Frequency noise suppression of a single mode laser with an unbalanced fiber interferometer for subnanometer interferometry

Radek Šmíd et al. Sensors (Basel). .

Abstract

We present a method of noise suppression of laser diodes by an unbalanced Michelson fiber interferometer. The unstabilized laser source is represented by compact planar waveguide external cavity laser module, ORIONTM (Redfern Integrated Optics, Inc.), working at 1540.57 nm with a 1.5-kHz linewidth. We built up the unbalanced Michelson interferometer with a 2.09 km-long arm based on the standard telecommunication single-mode fiber (SMF-28) spool to suppress the frequency noise by the servo-loop control by 20 dB to 40 dB within the Fourier frequency range, remaining the tuning range of the laser frequency.

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Figures

Figure 1.
Figure 1.
Scheme of the unbalanced interferometer for frequency stabilization: RIO (Redfern Integrated Optics) ORIONTM module; laser module, 90/10 and 50/50 fiber splitters; FM, Faraday mirror; AOM1, AOM2, acousto-optic modulators; VCO, voltage control oscillator; PD, photodetector; DSP, digital signal processor; LPF, low-pass filter; BPF, band-pass filter; RFSA, RF signal analyzer.
Figure 2.
Figure 2.
Single sideband frequency noise analysis of the ORION laser module. Comparison of the free-running, stabilized laser and the noise data from the manufacturer's datasheet [14].
Figure 3.
Figure 3.
Normalized power spectra of the RF beat-note signal produced by mixing the optical outputs of two uncorrelated ORION laser modules. Free running lasers (“free-run.”) are represented by the blue line, whereas lasers stabilized to the unbalanced Michelson interferometer (“stab. lasers”) are red. Lorentzian function fits (“free-run. Lorentz. fit” for free running lasers and “stabl. lasers Lorentz. fit” for lasers stabilized to the unbalanced Michelson interferometer) for estimating the linewidth were supplemented to both datasets. Top left is the zoomed inset of the single-sideband normalized power spectra plot with logarithmic frequency axis.
Figure 4.
Figure 4.
Out-of-loop measurement for stabilized and free-running ORION laser module.
See this image and copyright information in PMC

References

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