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The noise spectrum of the unlocked Erbium-doped laser offset frequency was incorrect.
©2003 Optical Society of America
The phase noise spectral density of the unlocked laser offset frequency should be as shown in Fig. 1.
Fig. 1. Fiber laser offset frequency noise PSD, Sfo(v) (solid lines, left axis) and integrated frequency noise (dotted lines, right axis) vs. frequency offset from carrier. The blue (red) solid line is the PSD of the unlocked (locked) offset frequencies, respectively. The unlocked and locked PSD’s were compiled from three different spectra of decreasing span (each 800 points) and increasing resolution (span divided by the number of points) to obtain greater resolution close to the carrier (displayed here as zero frequency).
References and links
1. Jens Rauschenberger, Tara M. Fortier, David J. Jones, Jun Ye, and Steven T. Cundiff, “Control of the frequency comb from a mode-locked Erbium-doped fiber laser” Opt. Express 10, 1404–1410 (2002), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-24-1404 [CrossRef] [PubMed]
