Words to Describe waveguides

How waveguides often is described ("________ waveguides")

• closed
• polymeric
• bent
• multimode
• cut
• ridged
• spaced
• single
• tapered
• loaded
• optic
• ended
• index
• hollow
• core
• type
• passive
• defect
• parallel
• anisotropic
• electromagnetic
• oversize
• integrated
• corrugated
• diffused
• digital
• crystal
• coaxial
• inhomogeneous
• fibre
• conventional
• coated
• identical
• open
• cylindrical
• active
• elliptical
• elastic
• metallic
• acoustic
• slotted
• buried
• uniform
• based
• symmetric
• lossless
• fiber
• practical
• polymer
• implanted
• asymmetric
• irregular
• optical
• loss
• filled
• thin
• linear
• dielectric
• periodic
• circular
• rectangular
• planar
• leaky
• arrayed
• adjacent
• coplanar
• dimensional
• curved
• oversized
• nonlinear
• doped
• homogeneous
• straight
• photonic
• flexible
• standard