Seiichi Onoda

W fiber design considerations.

The baseband frequency characteristics and the average confinement of light to core properties of a W fiber are analyzed in conjunction with corresponding singly clad (SC) fibers under some ideal assumptions It is found that the bandwidth of a W fiber is almost equal to that of the SC fiber that has no intermediate layer and is much wider than that of the other SC fiber in which the intermediate layer extends to infinity. The average fractional power flow outside the core in a W fiber is drastically reduced in comparison with both SC fibers. Practical design considerations are deduced from a typical example.

Properties of multimode W-fibres

Abstract The base-band frequency characteristics of a multimode W-fibre which consists of three layers (including a low-index intermediate layer) are analyzed under some idealized assumptions. It is found that the transmission band-width of the W-fibre is almost equal to that of the corresponding singly clad fibre which has no intermediate layer, while the fractional power flow outside the core can be drastically reduced. As a result, the W-fibre holds great potential for use as a wide-band optical waveguide achieving good light confinement without loss of core size.