Single Mode Operation of An Er Doped Fiber Ring Laser with Polarization Mode stability:Experiment

概要

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Recently there is a considerable interest in developing rare-earth-doped fiber lasers for applications in optical fiber communications and sensors. However, there are few work discussing the polarization behaviors in the fiber lasers. In a fiver ring resonator, there are two orthogonal resonant states of polarizations, that is, the eigenstate of polarizations(ESOP). The separation between the two ESOP's resonances has a random value and is varied as the birefringence changes, which can be induced by the external perturbations (e.g.,by the temperature fluctuation). We have proposed a novel structure of Er doped fiber ring laser which uses only the ordinary Er doped fiber to suppress this polarization instability. The resonator is composed of a twisted Er doped fiber and a coiled fiberλ/2 element. The eigenmodes in the twisted fiber, the right-hand and the left-hand rotated circular waves induced by the twisting, are exchanged by a fiber type λ/2 element. The separation between the two ESOP's resonances can thus be fixed symmetrically each other. In this paper, we further investigate the single mode operation of this novel Er doped fiber ring laser.
社団法人電子情報通信学会の論文
1994-09-26