Experimental setup: DBR diode: distributed Bragg reflection diode laser with independently controlled gain section (ga), phase section (ph), and grating section (DBR); : double-stage Faraday isolator with isolation each; Yb fiber: Yb-doped double clad fiber; DM: dichroic mirror and pump diode: at wavelength of .
(a): Output power of the diode-fiber MOPA system vs in-coupled pump power. Inset shows the arctanh modulation applied to the DBR diode laser at (frequency) . (b) Power spectrum of the amplified output showing ASE background suppression, when the MOPA system operates at maximum output power. Inset shows the Gaussian-shaped diode laser spectrum, resulting from the modulation depicted in inset (a), with at .
Optical spectral properties of the diode with modulation of the diode’s phase section current. (a1) Sinusoidal modulation at and . (a2) The asymmetry between the peaks for sinusoidal modulation increases with laser bandwidth. (b1) Triangular modulation at and . (b2) Best fit of ripple shows linear increase for triangular modulation with laser bandwidth. (c1) Inverse hyperbolic tangent modulation and and (c2) root-mean-square deviation from Gaussian spectrum as a function of laser bandwidth.
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