Design and Analysis of Infrared Tunable All-Optical Filters Based on Plasmonic Hybrid Nanostructure Using Periodic Nanohole Arrays

Plasmonics ◽  
2021 ◽  
Author(s):  
Sara Gholinezhad Shafagh ◽  
Hassan Kaatuzian ◽  
Mohammad Danaie
Keyword(s):  
Optical Filters ◽  
Hybrid Nanostructure ◽  
All Optical ◽  
Nanohole Arrays

scholarly journals All-optical demultiplexing of closely spaced multimedia radio signals using sub-picometer fiber Bragg grating

2021 ◽  
Author(s):  
Hatice Kosek
Keyword(s):  
Wireless Lan ◽  
High Speed ◽  
Bandpass Filter ◽  
Optical Filters ◽  
Multimedia Data ◽  
Potential Candidate ◽  
Rf Signals ◽  
All Optical ◽  
Radio Signals ◽  
Network Flexibility

Subcarrier multiplexed (SCM) transmission of multimedia radio signals such as CATV (5-860 MHz), cellular wireless (900 MHz) and wireless LAN (2.4 GHz) over fiber is frequently used to deliver broadband services cost effectively. These multi-channel radio-over-fiber (ROF) links have interesting applications and can connect enhanced wireless hotspots that will support high speed wireless LAN services or low speed cellular services to different customers from the same antenna. The SCM signals need to be demultiplexed, preferably in the optical domain for many reasons. Prefiltering of SCM signals with fiber-based optical filters warrants the use of inexpensive photodetectors and increases network flexibility. However, realizing optical demultiplexing as sub-GHz level is challenging and thus necessitates optical filters with high selectivity and low insertion loss and distortion. We developed a novel sub-picometer all-optical bandpass filter by creating a resonance cavity using two closely matched fiber Bragg gratings (FBGs). This filter has a bandwidth of 120 MHz at -3 dB, 360 MHz at -10 dB and 1.5 GHz at -20 dB. Experimental results showed that the filter is capable of separating two radio frequency (RF) signals spaced as close as 50 MHz without significant distortion. When this demultiplexer was employed to optically separate 2.4 GHz and 900 MHz radio signals, it was found to be linear from -38 dBm to +6 dBm with ~ 25.5 dB isolation. There was no significant increment in the BER of the underlying multimedia data. Results verified that the fabricated narrow bandpass filter can be a potential candidate in demultiplexing of RF signals in networks based on subcarrier multiplexed schemes.

TRANSMISSION AND DIFFRACTION THROUGH METALLIC NANOSLIT

2008 ◽  
Vol 22 (29) ◽  
pp. 2821-2829 ◽  
Author(s):  
JUAN LIU ◽  
BIN HU ◽  
JING-HUI XIE ◽  
YONG-TIAN WANG
Keyword(s):  
Surface Plasmon ◽  
Optical Transmission ◽  
Optical Network ◽  
Optical Filters ◽  
Finite Width ◽  
Metallic Films ◽  
Wavelength Division ◽  
All Optical ◽  
Plasmon Polaritons ◽  
Sub Wavelength

The extraordinary optical transmission (EOT) and diffraction through nanoslit composed of two finite-width metallic films with periodic or aperiodic sub-wavelength corrugation were studied. The transmitted spectra were calculated and compared, and the numerical results showed that two transmission peaks exist for the periodic corrugation, while for aperiodic one the transmission peaks are split into seven, corresponding to their different periods and couplings. Further investigation indicated that resonant wavelength of Surface Plasmon Polaritons (SPPs) determined by the nanoslit can be distinguished. It is expected that this investigation will provide useful information for further designing various nano-scaled optical filters and wavelength division multiplexer (WDM) in the next all optical network (AON).

scholarly journals All-optical demultiplexing of closely spaced multimedia radio signals using sub-picometer fiber Bragg grating

2021 ◽  
Author(s):  
Hatice Kosek
Keyword(s):  
Wireless Lan ◽  
High Speed ◽  
Bandpass Filter ◽  
Optical Filters ◽  
Multimedia Data ◽  
Potential Candidate ◽  
Rf Signals ◽  
All Optical ◽  
Radio Signals ◽  
Network Flexibility

Subcarrier multiplexed (SCM) transmission of multimedia radio signals such as CATV (5-860 MHz), cellular wireless (900 MHz) and wireless LAN (2.4 GHz) over fiber is frequently used to deliver broadband services cost effectively. These multi-channel radio-over-fiber (ROF) links have interesting applications and can connect enhanced wireless hotspots that will support high speed wireless LAN services or low speed cellular services to different customers from the same antenna. The SCM signals need to be demultiplexed, preferably in the optical domain for many reasons. Prefiltering of SCM signals with fiber-based optical filters warrants the use of inexpensive photodetectors and increases network flexibility. However, realizing optical demultiplexing as sub-GHz level is challenging and thus necessitates optical filters with high selectivity and low insertion loss and distortion. We developed a novel sub-picometer all-optical bandpass filter by creating a resonance cavity using two closely matched fiber Bragg gratings (FBGs). This filter has a bandwidth of 120 MHz at -3 dB, 360 MHz at -10 dB and 1.5 GHz at -20 dB. Experimental results showed that the filter is capable of separating two radio frequency (RF) signals spaced as close as 50 MHz without significant distortion. When this demultiplexer was employed to optically separate 2.4 GHz and 900 MHz radio signals, it was found to be linear from -38 dBm to +6 dBm with ~ 25.5 dB isolation. There was no significant increment in the BER of the underlying multimedia data. Results verified that the fabricated narrow bandpass filter can be a potential candidate in demultiplexing of RF signals in networks based on subcarrier multiplexed schemes.

Ultrafast all-optical AND gate based on cascaded SOAs with assistance of optical filters

2007 ◽  
Vol 43 (10) ◽  
pp. 585 ◽  
Author(s):  
J. Xu ◽  
X. Zhang ◽  
J. Dong ◽  
D. Liu ◽  
D. Huang
Keyword(s):  
Optical Filters ◽  
All Optical

Dressing Field Control of Band Gap Reflection in a Homogeneous Atomic Medium

2014 ◽  
Vol 924 ◽  
pp. 152-157
Author(s):  
Li Li ◽  
Yuan Yuan Li
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Stop Band ◽  
Optical Filters ◽  
Coupling Field ◽  
First Case ◽  
Atomic Medium ◽  
All Optical ◽  
Field Control ◽  
Photonic Band

Dressing field control of band gap reflection is investigated in an inverse Y-type four-level atomic system. It is shown that when the dressing field is blocked, a band gap reflection with a maximum bandwidth and nearly ~90% reflectivity can be achieved for the detuning of the coupling field . When a weak dressing field is applied to the system (the intensity is much less than that of the coupling field), a narrowing top flat with ~86% reflectivity of the band gap reflection is observed in comparison with that in the first case. We also show that the band gap reflection can be dramatically suppressed due to the collapse of the stop band when a strong dressing field (the intensity is comparable with or larger than that of the coupling field) is employed. This control of photonic band gap reflection can be used in the applications of all-optical reflection mirrors and band optical filters.

Performance evaluation of GaAs photonic crystal based directional coupler all optical switch

2018 ◽  
Vol 7 (3.29) ◽  
pp. 220
Author(s):  
Sivasindhu M ◽  
P Samundiswary
Keyword(s):  
Performance Evaluation ◽  
Photonic Crystal ◽  
Integrated Circuits ◽  
High Speed ◽  
Directional Coupler ◽  
Optical Switch ◽  
Optical Filters ◽  
Optical Signals ◽  
All Optical ◽  
All Optical Switch

In future, the telecommunication systems will be totally based upon the photonic integrated circuits and components for the transmission of optical signals. Since optical signals offer high speed, less delay and higher efficiency. This introduces a new research area for photonic crystal based optical components like optical switch, multiplexer, optical filters etc. Among these devices, the optical switch draws more attention due to its primary switching operation. Hence, this paper deals with the modified design structure of GaAs photonic crystal based directional coupler all optical switch which operates at the wavelength of 1300nm. Further the switching performance evaluation of this device is made for both electro optic effect and non-linear optical effect. The design and simulation of the optical switch is done through Comsol Multiphysics software.   

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