Branching waveguide coupler in a GaAs/GaAlAs injection laser

1978 ◽  
Vol 32 (10) ◽  
pp. 658-661 ◽  
Author(s):  
D. R. Scifres ◽  
R. D. Burnham ◽  
W. Streifer
Keyword(s):  
Injection Laser ◽  
Waveguide Coupler ◽  
Branching Waveguide

Planar stripe with waist/notch (swan) injection laser

1978 ◽  
Vol 14 (24) ◽  
pp. 753 ◽  
Author(s):  
T. Ikegami ◽  
G. Iwane ◽  
H. Kawaguchi ◽  
K. Wakita
Keyword(s):  
Injection Laser

scholarly journals Relaxation time broadening on emission spectrum of a Zn‐dopedp‐type GaAs injection laser

1983 ◽  
Vol 43 (9) ◽  
pp. 818-820 ◽  
Author(s):  
Minoru Yamada ◽  
Akira Tanaka ◽  
Kiyoshi Moriya ◽  
Yuichi Kado
Keyword(s):  
Relaxation Time ◽  
Emission Spectrum ◽  
Injection Laser

Design of coaxial and waveguide couplers for helix TWT

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mukesh Kumar Alaria ◽  
Sanjay Kumar Ghosh
Keyword(s):  
Traveling Wave ◽  
Return Loss ◽  
Characteristic Impedance ◽  
Three Dimensional ◽  
Waveguide Coupler ◽  
Quarter Wavelength ◽  
Different Types ◽  
Waveguide Type ◽  
Transformer Design ◽  
Traveling Wave Tubes

Abstract In this paper, two types of coaxial coupler and waveguide coupler for different frequency helix traveling wave tubes (TWTs) are designed, fabricated and cold tested. The coaxial coupler includes of window ceramic and RF transformer section. At present multi-section impedance transformer design approach is used for wideband helix TWTs. In any helix TWT, impedance of the source is transformed to the characteristic impedance of helix. This is done by the quarter-wavelength (λ/4) impedance transformation approach. The simulated results of different types of couplers are carried out by HFSS and CST microwave studio software and compare with experimental results. Three-dimensional electromagnetic field simulators allowing the any geometry with port excitations it is possible to model the complex coaxial and waveguide type couplers with helix SWS assembly and predict its desired return loss performances.

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