资料介绍
[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 < n f nc = ns : Symmetric Waveguide nc > 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 < sin θ s ≤ sin θ c : Radiation modes sin θ c < sin θ ≤ sin θ s : Substrate modes sin θ c ≤ sin θ s ≤ sin θ : Guided modes
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.
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