[optoelectronics] ch-3 optical waveguideOPTICAL WAVEGUIDES
Division of Electrical and Computer Engineering Hanyang University http://oeic.hanyang.ac.kr
COMMUNICATION RESEARCH LAB.
3-LAYER SLAB WAVEGUIDE
nc ≤ ns ns : Asymmetric Waveguide
COMMUNICATION RESEARCH LAB.
GUIDING CONDITION
sin θ > sin θ s ≥ sin θ c ns θ s = sin nf
1
,
nc θ c = sin nf
1
sin θ
COMMUNICATION RESEARCH LAB.
r DECOMPOSITION of k f
r cos θ + z sin θ ] k f 1 = k0 n f [x r cos θ + z sin θ ] k f 2 = k0 n f [ x
Longitudinal Propagation Constant
β = k0 n f sin θ
Transverse Wave Number
κ x = k0 n f cos θ =
(k0n f )2 β 2
COMMUNICATION RESEARCH LAB.
T……
