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The longitudinal mode-field components in strongly confining crystalline-silicon waveguides cause a forward-backward asymmetry of the stimulated Raman effect. This nonreciprocity can be used to realise isolators with dynamically reconfigurable isolation direction.
We propose a novel multimode silicon waveguide Raman amplifier consisting of collinearly propagating pump and amplified Stokes beams with self-imaging of Stokes beam due to Talbot effect. Application of this device as image pre-amplifier is discussed.
The field deformation in bent fibers causes a non-symmetric field overlap with the thermal fiber stress profile and yields large modal stress birefringence. The latter can fully compensate the well-known bending-induced mechanical stress birefringence.
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