Patent ID: 8218921

Claim:
A chiral fiber grating of a predetermined grating strength configured for controlling light transmission in a predetermined wavelength range, comprising: a first optical fiber having a first interface portion at a first end, a second interface portion at a second end, and having a middle portion therebetween, said first optical fiber comprising: at least one fiber core, having a first longitudinal section disposed within said first interface portion, a second longitudinal section disposed within said second interface portion, and a longitudinal helical section, disposed therebetween within said middle portion, and comprising a longitudinal helix structure of a single predetermined handedness, having a predetermined pitch profile, and a predetermined helix diameter profile selected and configured to produce the predetermined grating strength; and a cladding longitudinally surrounding said at least one fiber core in each of said first and second longitudinal sections and in said longitudinal helical section, wherein said at least one fiber core is substantially concentric to said corresponding at least one cladding in regions in each of said first and said second sections that are proximal to each respective end of said longitudinal helical section.