scholarly journals A TUNABLE 1.4-2.5 GHZ BANDPASS FILTER BASED ON SINGLE MODE

2013 ◽  
Vol 135 ◽  
pp. 261-269 ◽  
Author(s):  
YanYi Wang ◽  
Feng Wei ◽  
He Xu ◽  
Xiao-Wei Shi
Keyword(s):  
Bandpass Filter ◽  
Single Mode

scholarly journals Closed-loop ring resonator topology for bandpass filter applications

2020 ◽  
Vol 17 (3) ◽  
pp. 1422
Author(s):  
Norfishah Ab Wahab ◽  
M. N. Md Tan ◽  
M. N. Hushim
Keyword(s):  
Transmission Lines ◽  
Closed Loop ◽  
Bandpass Filter ◽  
Ring Resonator ◽  
Single Mode ◽  
Ring Structure ◽  
Transmission Zeros ◽  
Quarter Wavelength ◽  
Coupled Lines ◽  
Loop Ring

<p class="Pa41">This paper presents a single mode pseudo-elliptic bandpass resonator based on closed-loop ring topology. The resonator is built from six quarter wavelength transmission lines to form a square closed-loop ring structure. This structure creates transmission zeros at the lower and upper sidebands so that high selectivity bandpass filter response is achieved. The advantage of this topology is that the design is less complex since no perturbation is needed on the ring lines for creation of transmission zeros. Higher-order filters can be constructed by introducing quarter-wavelength coupled-lines, coupled at both input and output of the closed-loop ring resonator. For proof of concept, the filters are designed at 10 GHz up to 3<sup>rd</sup> order, simulated using full-wave electromagnetic simulator on microstrip substrate, <em>FR-4</em> with characteristics given as <em>Ԑr </em>= 4.70, <em>h </em>= 1.499 mm and <em>tan δ </em>= 0.012.  The filters are simulated and responses are found to be agreeable with the proposed idea.</p>

scholarly journals Performance of etched silica FBG for simultaneous strain temperature measurement

2021 ◽  
Author(s):  
Koustav Dey ◽  
Ramesh Buddu ◽  
Sourabh Roy
Keyword(s):  
Temperature Measurement ◽  
Experimental Measurement ◽  
Bandpass Filter ◽  
Fiber Bragg Gratings ◽  
Strain Range ◽  
Single Mode ◽  
Bragg Gratings ◽  
Single Mode Fiber ◽  
Experimental Results ◽  
Interrogation Technique

Abstract In this article, we have extensively investigated the efficiency of etched silica-based fiber Bragg gratings (FBGs) for the experimental measurement of temperature and strain simultaneously. A single-multi-single mode fiber (SMS) combination is employed in the circuitry which acts as a bandpass filter for efficient interrogation technique. We recorded the sensitivity of 20.30 pm/°C and 2.89 pm/µɛ over the temperature and strain range of 25–225°C and 50-2050 µɛ, respectively. These data were recorded with the strain resolution of ± 10 µɛ whereas the resolution for the temperature is ± 0.50°C. The experimental results show the potentiality of the sensor for measuring the strain and temperature simultaneously with higher intrinsic sensitivity and resolution.

scholarly journals DUAL-BAND BANDPASS FILTER INCORPORATING DUAL-MODE AND SINGLE-MODE RESONATORS

2018 ◽  
Vol 80 ◽  
pp. 61-66
Author(s):  
Shou Jia Sun ◽  
Pan Yin ◽  
Yu-Ning Feng ◽  
Xinshe Yin
Keyword(s):  
Bandpass Filter ◽  
Single Mode ◽  
Dual Band ◽  
Dual Mode

scholarly journals Polarimetric parity-time symmetry in a photonic system

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Lingzhi Li ◽  
Yuan Cao ◽  
Yanyan Zhi ◽  
Jiejun Zhang ◽  
Yuting Zou ◽  
...  
Keyword(s):  
Bandpass Filter ◽  
Single Mode ◽  
Pt Symmetry ◽  
Coupling Coefficients ◽  
Fiber Ring ◽  
Spatial Unit ◽  
Time Symmetry ◽  
Spatially Distributed ◽  
Loss Coefficients ◽  
Gain Loss

Abstract Parity-time (PT) symmetry has attracted intensive research interest in recent years. PT symmetry is conventionally implemented between two spatially distributed subspaces with identical localized eigenfrequencies and complementary gain and loss coefficients. The implementation is complicated. In this paper, we propose and demonstrate that PT symmetry can be implemented between two subspaces in a single spatial unit based on optical polarimetric diversity. By controlling the polarization states of light in the single spatial unit, the localized eigenfrequencies, gain, loss, and coupling coefficients of two polarimetric loops can be tuned, leading to PT symmetry breaking. As a demonstration, a fiber ring laser based on this concept supporting stable and single-mode lasing without using an ultranarrow bandpass filter is implemented.

Design of a Single-Mode Plasmonic Bandpass Filter Using a Hexagonal Resonator Coupled to Graded-Stub Waveguides

Plasmonics ◽  
2018 ◽  
Vol 14 (1) ◽  
pp. 53-62 ◽  
Author(s):  
Shiva Khani ◽  
Mohammad Danaie ◽  
Pejman Rezaei
Keyword(s):  
Bandpass Filter ◽  
Single Mode
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