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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 7,
  • Issue 11,
  • pp. 1018-1021
  • (2009)

Coherent combining of tunable erbium-doped fiber lasers by a single-mode fiber feedback loop

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Abstract

We experimentally demonstrate the coherent combining of two tunable erbium-doped fiber lasers by using a single-mode fiber feedback loop configuration. A single-mode fiber is arranged in the feedback loop to filter the far-field pattern, and the energy of desired in-phase mode is collected and injected into the resonators of two component fiber lasers. The coherently combined laser is tunable over a wide spectrum ranging from 1536 to 1569 nm, which means that the combining scheme is compatible with wavelength tuning. The effects and necessity of whether adopting polarization controlling measures or not in component lasers are investigated in detail. The results indicate that adding polarization controlling can improve the array's coherence, whereas it will decrease the output power and efficiency simultaneously.

© 2009 Chinese Optics Letters

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