scholarly journals A Broadband Gold-Coated Photonic Crystal Fiber Polarization Filter with a High Loss Ratio of Both Polarizations at 1550 and 1310 nm

Photonics ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 488
Author(s):  
Chao Wang ◽  
Guoxu Zhang ◽  
Zheng Wu ◽  
Yajing Zhang ◽  
Yiyang Zhang ◽  
...  

A new kind of gold-coated hexagonal photonic crystal fiber polarization filter is designed in this paper. The filtering properties can be adjusted through varying the structural parameters. With the 25.60 nm gold film thickness, the losses of the respective modes of Y and X-polarized core mode at 1550 nm are 1024.84 and 0.12 dB/cm with the loss ratio of 8540.33 between two polarizations. However, the losses of Y and X-polarized core mode at 1310 nm are 682.14 and 0.03 dB/cm, and the loss ratio is 22,738 with the gold film thickness of 55.30 nm. That indicates that the proposed filter has a higher loss ratio. Moreover, the crosstalk value with the fiber length of 200 μm at 1550 and 1310 nm are 178.01 and 118.49 dB, respectively. The bandwidths with crosstalk value greater than 20 dB are 640 and 180 nm. The designed polarization filter represents good filtering characteristics and allows great fabrication tolerances. Therefore, the designed hexagonal filter can be well applied in the domain of optical fiber communication.

Plasmonics ◽  
2015 ◽  
Vol 11 (3) ◽  
pp. 857-863 ◽  
Author(s):  
Qiang Liu ◽  
Shuguang Li ◽  
Jianshe Li ◽  
Hailiang Chen ◽  
Zhenkai Fan ◽  
...  

2018 ◽  
Vol 46 ◽  
pp. 282-286 ◽  
Author(s):  
Shuhuan Zhang ◽  
Jianshe Li ◽  
Zhen Zhang ◽  
Ying Guo ◽  
Yujun Wang ◽  
...  

Micromachines ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 470 ◽  
Author(s):  
Nan Chen ◽  
Xuedian Zhang ◽  
Min Chang ◽  
Xinglian Lu ◽  
Jun Zhou

Polarization filter is a very important optical device with extinction characteristics. Due to the design flexibility of photonic crystal fibers and the high excitation losses of the gold layer, the polarization filter based on the photonic crystal fiber and surface plasmonic resonance effect is widely studied. Considering these, we present a simple and high-performance polarization filter using the finite element method. Numerical simulations show that there is a large difference in energy between the two polarization directions by reasonable adjustment of the structural parameters, the confinement loss in the x-pol direction is less than that in the y-pol direction, which is suitable to realize a broadband polarization filter. When the fiber length is 2 mm, the extinction ratio peak can reach −478 dB, and the bandwidth with the extinction ratio better than −20 dB is 750 nm, which covers communication wavelengths of 1.31 μm and 1.55 μm (1.05–1.8 μm). It also has a low insertion loss of 0.11 dB at 1.31 μm and 0.04 dB at 1.55 μm. In addition, our design has high feasibility in fabrication and better tolerance. The proposed filter with compactness, high extinction ratio, broad bandwidth, and low insertion loss would play an important role in the sensing detection, bio-medical, and telecommunication field.


2019 ◽  
Vol 11 (2) ◽  
pp. 1-12 ◽  
Author(s):  
Min Chang ◽  
Baixuan Li ◽  
Nan Chen ◽  
Xinglian Lu ◽  
Xuedian Zhang ◽  
...  

Author(s):  
zhiyong yin ◽  
Xili Jing ◽  
Yuhui Feng ◽  
Zhigang Gao ◽  
Biao Wu ◽  
...  

Abstract A twin-core photonic crystal fiber sensor is proposed for measuring liquid refractive index (RI) and temperature simultaneously. The air holes of the sensor are arranged in a hexagonal pattern, and two planes are introduced by polishing in the cladding. On one side of the plane, the gold film is deposited for RI measurement, and on the other side, the gold film and polydimethylsiloxane (PDMS) are deposited for temperature measurement. We analyzed its sensing characteristics by using finite element method. The numerical results show that the two channels for measuring RI and temperature have no mutual interference. It reduces the complexity of the sensing measurement. The maximum spectral sensitivity of the sensor is 20000 nm/RIU and 9.2 nm/℃, respectively, when the liquid RI is in the range of 1.36-1.42 and the temperature is in the range of 0-50 ℃. The results also show the sensing accuracy was not very sensitive to the change of structural parameters. It hence makes the sensor be easy to fabricate. Our work is very helpful for implementation of a high sensitivity, easy fabrication and real-time multi-parameter SPR sensor.


Plasmonics ◽  
2016 ◽  
Vol 12 (2) ◽  
pp. 377-382 ◽  
Author(s):  
Guangyao Wang ◽  
Shuguang Li ◽  
Xinyu Wang ◽  
Yunyan Zhao ◽  
Qiang Liu ◽  
...  

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