Abstract

We report the design and performance of a single frequency all-fiber distributed feedback (DFB) laser sources employing fiber Bragg gratings (FBGs) emitting in the 2- $\mu$ m region. Output powers up to 65 mW CW and optical signal-to-noise ratios of $>$ 65 dB/0.05 nm are obtained. The emission wavelength of the DFB–FBG laser can be fine-tuned with picometer accuracy over a range of 0.6 nm by controlling the pump power and laser temperature. The single frequency source is amplified with polarization-maintaining Ho- or Tm-doped fiber amplifiers to an output power of 1 W CW at 2051 nm or 0.7 W CW at 2039 nm. Heterodyne measurements yield instantaneous laser linewidths of 5 kHz FWHM for both native and amplified signals.

25  W 2  μm broadband polarization-maintaining hybrid Ho- and Tm-doped fiber amplifier

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2.05 kW all-fiber high-beam-quality fiber amplifier with stimulated Brillouin scattering suppression incorporating a narrow-linewidth fiber-Bragg-grating-stabilized laser diode seed source

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kW-level narrow linewidth fiber amplifier seeded by a fiber Bragg grating based oscillator

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Ultra-wideband all-fiber tunable Tm/Ho-co-doped laser at 2 μm

Guanghui Xue, Bin Zhang, Ke Yin, Weiqiang Yang, and Jing Hou
Opt. Express 22(21) 25976-25983 (2014)