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Polarisation dependence of the phase shift of 2×2 single-mode fibre directional couplers

Polarisation dependence of the phase shift of 2×2 single-mode fibre directional couplers

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Phase shift variations of 2×2 couplers caused by polarisation changes of the input lightwaves have been investigated. Non-negligible deviations from the ideal phase shift value of 180° occur, especially when unequal states of polarisation are excited at the input ports of the coupler. This effect must be considered in interferometric applications.

Inspec keywords: optical couplers; optical fibres; directional couplers; light polarisation; oscillations

Other keywords: polarisation dependence; 2×2 singlemode fibre directional couplers; ideal phase shift; interferometric applications; input ports; phase shift; input lightwaves

Subjects: Fibre optics; Fibre couplers and connectors; Other fibre optical properties

References

    1. 1)
      • F. Schliep , R. Hereth , G. Schiffner . Phase sensitive investigations of 3×3 singlemode couplers. Electron. Lett. , 1
    2. 2)
      • R. Hereth , G. Schiffner . Broad-band optical directional couplers and polarisation splitters. J. Lightwave Technol.
    3. 3)
      • I. Sanz , M.A. Muriel . Measurement technique for characterization of 2×2 couplers. Electron. Lett. , 14
    4. 4)
      • F. Schliep , R. Hereth . Phase sensitive measurement technique for singlemode fibre directionalcouplers. Electron. Lett. , 16
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