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Optica Publishing Group
  • CLEO/Europe and EQEC 2009 Conference Digest
  • (Optica Publishing Group, 2009),
  • paper CJ3_2

All-fiber Coherent Combining of Er-doped Amplifiers via Refractive Index Control in Yb-doped Fibers by Two-wavelengths Optical Signal

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Abstract

Non-linear effects can significantly reduce power levels available with standard single-mode fiber devices. One of the ways to overcome this limitation is to use coherent combining of single mode fiber amplifiers. The general idea of this approach is to split a coherent beam into many beams which are then amplified by a parallel array of similar power amplifiers and finally re-combined to a single diffraction limited beam. To combine the power of all the channels in one single-mode output the fiber amplifiers must be phase-locked together. The effect of refractive index changes (RICs) induced in single mode Yb-doped optical fibers by resonance pumping (that is essentially a side effect of the population inversion) [1] offers a simple solution for all-fiber coherent combining of intense laser beams at any IR wavelength far from Yb-doped ion resonances. Here we report a coherent combining of two 500-mW EDFAs operating at 1550nm with a dynamical phase control provided either by one low-power laser diode at 980nm alone or in combination with a laser at 1060nm both stimulating electron transitions in an Yb-doped optical fiber. Two wavelengths scheme improves the dynamical range and the response time of the phase control loop.

© 2009 IEEE

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