Design and synthesis of a modified band-pass optical filter

2004 ◽  
Vol 97 (3) ◽  
pp. 446-454 ◽  
Author(s):  
K. D. Misra ◽  
R. K. Mishra
Author(s):  
Weijun Jiang ◽  
Lu Xu ◽  
Xiaolong Liu ◽  
Yu Yu ◽  
Yuan Yu ◽  
...  
Keyword(s):  

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 89
Author(s):  
Bowen Zhang ◽  
Nuo Chen ◽  
Xinda Lu ◽  
Yuhang Hu ◽  
Zihao Yang ◽  
...  

A chip-scale tunable optical filter is indispensable to meeting the demand for reconfigurability in wavelength division multiplexing systems, channel routing, and switching, etc. Here, we propose a new scheme of bandwidth tunable band-pass filters based on a parity-time (PT) symmetric coupled microresonator system. Large bandwidth tunability is realized on the basis of the tuning of the relative resonant frequency between coupled rings and by making use of the concept of the exception point (EP) in the PT symmetric systems. Theoretical investigations show that the bandwidth tuning range depends on the intrinsic loss of the microresonators, as well as on the loss contrast between the two cavities. Our proof-of-concept device confirms the tunability and shows a bandwidth tuning range from 21 GHz to 49 GHz, with an extinction ratio larger than 15 dB. The discrepancy between theory and experiment is due to the non-optimized design of the coupling coefficients, as well as to fabrication errors. Our design based on PT symmetry shows a distinct route towards the realization of tunable band-pass filters, providing new ways to explore non-Hermitian light manipulation in conventional integrated devices.


2008 ◽  
Vol 281 (14) ◽  
pp. 3709-3714 ◽  
Author(s):  
Kan Yu ◽  
Wen Liu ◽  
Dexiu Huang ◽  
Jing Chang

1996 ◽  
Author(s):  
Duane E. Paulsen ◽  
Vladimir Pelekhaty ◽  
XiaoLu L. Wang

2005 ◽  
Author(s):  
Andrzej Walczak ◽  
Piotr Marciniak

2018 ◽  
Vol 5 (2) ◽  
pp. 3755-3763
Author(s):  
Vemuri SRS Praveen Kumar ◽  
Parinam Sunita ◽  
Mukesh kumar ◽  
Neelam kumari ◽  
Vinod Karar ◽  
...  

Electronics ◽  
2021 ◽  
Vol 10 (22) ◽  
pp. 2853
Author(s):  
Satheeshkumar Palanisamy ◽  
Balakumaran Thangaraju ◽  
Osamah Ibrahim Khalaf ◽  
Youseef Alotaibi ◽  
Saleh Alghamdi

In this paper, a compact bandpass filter with improved band stop and band pass characteristics for wireless applications is built with four internal conductive poles in a single resonating cavity, which adds novel quad-resonating modes to the realization of band pass filter. This paper covers the design and testing of the S-band combline coaxial cavity filter which is beneficial in efficient filtering functions in wireless communication system design. The metallic cavity high Q coaxial resonators have the advantages of narrowband, low loss, better selectivity and high potential for power handling, as compared to microstrip filter in the application to determine the quality factor of motor oils. Furthermore, the tuning of coupling screws in the combline filter allows in frequency and bandwidth adjustments. An impedance bandwidth of 500 MHz (fractional bandwidth of 12.8%) has been achieved with an insertion loss of less than 2.5 dB and return loss of 18 dB at the resonant frequency. Four-pole resonating cavity filters have been developed with the center frequency of 4.5 GHz. Insert loss at 0 dB and estimated bandwidth at 850 MHz and a quality factor of 4.3 for the band pass frequencies between 4 and 8 GHz is seen in the simulated result.


2016 ◽  
Vol 36 (2) ◽  
pp. 0222004 ◽  
Author(s):  
蔡渊 Cai Yuan ◽  
周晟 Zhou Sheng ◽  
刘定权 Liu Dingquan

2011 ◽  
Author(s):  
H. Watanabe ◽  
M. Tomiki ◽  
H. Sakata ◽  
T. Yamashita ◽  
A. Kawasaki ◽  
...  
Keyword(s):  

2018 ◽  
Vol 39 (3) ◽  
pp. 285-288 ◽  
Author(s):  
Ahmadreza Vaisi ◽  
Mohammad Soroosh ◽  
Alimorad Mahmoudi

Abstract Transmission efficiency and quality factor are two of the most crucial characteristics in designing optical band pass filters. In this paper, we proposed a novel structure for realizing an optical filter. For the wavelength selecting part of the filter, we employed a V-shaped resonant cavity. The obtained filter has a resonant mode at 1313 nm with transmission efficiency and quality factor as much as 97 % and 3548, respectively.


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