Hexagonal patterns in optical bistability

Fluctuations and correlations in hexagonal optical patterns.

We analyze the influence of noise in transverse hexagonal patterns in nonlinear Kerr cavities. The near-field fluctuations are determined by the neutrally stable Goldstone modes associated to translational invariance and by the weakly damped soft modes. However, these modes do not contribute to the far-field intensity fluctuations that are dominated by damped perturbations with the same wave ve...

Hexagonal optical patterns in anisotropic non-linear media

– We present experimental observations of hexagonal patterns in strongly anisotropic non-linear optical media. Close to threshold rolls are observed. As the non-linearity is increased a transition from rolls to hexagons, leading finally to a pure hexagonal state, is observed. A mean-field model, in agreement with experiments, shows that the anisotropy locks the far-field orientation of the hexa...

Improvement of Optical Properties in Hexagonal Index-guiding Photonic Crystal Fiber for Optical Communications

Waveguides with low confinement loss, low chromatic dispersion, and low nonlinear effects are used in optical communication systems. Optical fibers can also be employed in such systems. Besides optical fibers, photonic crystal fibers are also highly suitable transmission media for optical communication systems. In this paper, we introduce two new designs of index-guiding photonic crystal fiber ...

Optical Bistability in Active Devices

1 . I n t r o d u c t i o n R e c e n t p r o g r e s s i n t h e s t u d y o f b o t h a b s o r p t i v e a n d d i s p e r s i v e b i s t a b i l i t y i n l a s e r d i o d e s (LDs) i s r e v i e w e d / I / . T h e m o s t d i s t i n c t i v e f e a t u r e o f b i s t a b l e LDs i s t h a t t h e y h a v e o p t i c a l g a i n . O p t i c a l g a i n r e s u l t s i n a d v a n t a g...

Optical Bistability and its Computation