Multiple-phase-shift DFB laser using transmission-line laser model

2002 ◽  
Author(s):  
Hairong Liu ◽  
Zou Wei ◽  
Hooshang Ghafouri-Shiraz
Keyword(s):  
Phase Shift ◽  
Transmission Line ◽  
Multiple Phase ◽  
Dfb Laser ◽  
Laser Model

scholarly journals Four-Port Dual-Mode Diplexer with High Signal Isolation

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Jessada Konpang ◽  
Natchayathorn Wattikornsirikul
Keyword(s):  
Phase Shift ◽  
Transmission Line ◽  
Phase Shifter ◽  
High Signal ◽  
Dual Mode ◽  
High Isolation ◽  
Centre Frequency ◽  
Phase Cancellation ◽  
Signal Isolation

An ease of four-port dual-mode diplexer with high signal isolation is presented. A compact dual-mode diplexer with high signal isolation between the Rx and Tx modules is achievable by only using one resonator filter topology. Two back-to-back dual-mode diplexers have a 180° phase shift in one branch. The high isolation can be achieved by amplitude and phase cancellation technique. The delayed transmission line can be easily achieved by the phase shifter. The simulated and measured four-port dual-mode diplexers are designed at the centre frequency of Rx/Tx at 1.95 GHz and 2.14 GHz, respectively. The measured results of Rx/Tx dual-mode diplexer devices are presented with 47.1 dB Rx/Tx isolation. This four-port dual-mode diplexer achieves the isolation (S32) of more than 24.1 dB when compared with the conventional three-port dual-mode diplexer structure.

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