scholarly journals Modeling of Wide-Band Optical Signal Amplification in an EDFA Network Using Tunable Tap

2012 ◽  
Vol 4 (4) ◽  
Author(s):  
Ricky Anthony ◽  
Mousami Biswas ◽  
Somnath Pain ◽  
Rini Lahiri ◽  
Sambhunath Biswas
Keyword(s):  
Signal Amplification ◽  
Wide Band ◽  
Optical Signal

scholarly journals Signal Amplification in an Optical and Dielectric Biosensor Employing Liquid Crystal-Photopolymer Composite as the Sensing Medium

Biosensors ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 81
Author(s):  
Hassanein Shaban ◽  
Shih-Chun Yen ◽  
Mon-Juan Lee ◽  
Wei Lee
Keyword(s):  
Dielectric Constant ◽  
Liquid Crystal ◽  
Uv Irradiation ◽  
Signal Amplification ◽  
Limit Of Detection ◽  
Optical Signal ◽  
Uv Exposure ◽  
Dielectric Anisotropy ◽  
Optical Texture ◽  
Potential Development

An optical and dielectric biosensor based on a liquid crystal (LC)–photopolymer composite was established in this study for the detection and quantitation of bovine serum albumin (BSA). When the nematic LC E7 was doped with 4-wt.% NOA65, a photo-curable prepolymer, and photopolymerized by UV irradiation at 20 mW/cm2 for 300 s, the limit of detection determined by image analysis of the LC optical texture and dielectric spectroscopic measurements was 3400 and 88 pg/mL for BSA, respectively, which were lower than those detected with E7 alone (10 μg/mL BSA). The photopolymerized NOA65, but not the prepolymer prior to UV exposure, contributed to the enhanced optical signal, and UV irradiation of pristine E7 in the absence of NOA65 had no effect on the optical texture. The effective tilt angle θ, calculated from the real-part dielectric constant ε’, decreased with increasing BSA concentration, providing strong evidence for the correlation of photopolymerized NOA65 to the intensified disruption in the vertically oriented LC molecules to enhance the optical and dielectric signals of BSA. The optical and dielectric anisotropy of LCs and the photo-curable dopant facilitate novel quantitative and signal amplification approaches to potential development of LC-based biosensors.

Theory of optical signal amplification and processing by quantum-dot semiconductor optical amplifiers

2004 ◽  
Vol 69 (23) ◽  
Author(s):  
M. Sugawara ◽  
H. Ebe ◽  
N. Hatori ◽  
M. Ishida ◽  
Y. Arakawa ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Signal Amplification ◽  
Optical Amplifiers ◽  
Semiconductor Optical Amplifiers ◽  
Optical Signal

Reversible Gating of Plasmonic Coupling for Optical Signal Amplification

2016 ◽  
Vol 8 (28) ◽  
pp. 18157-18164 ◽  
Author(s):  
Christopher G. Khoury ◽  
Andrew M. Fales ◽  
Tuan Vo-Dinh
Keyword(s):  
Signal Amplification ◽  
Optical Signal ◽  
Plasmonic Coupling

Optoelectronic matrix switching

1989 ◽  
Vol 67 (4) ◽  
pp. 389-393 ◽  
Author(s):  
R. I. MacDonald
Keyword(s):  
Cross Talk ◽  
Electromagnetic Coupling ◽  
Integrated Control ◽  
Forward Bias ◽  
Wide Band ◽  
Optical Signal ◽  
Current Status ◽  
Design Matrix ◽  
Hybrid Technique ◽  
Zero Bias

Because cross talk from electromagnetic coupling increases with frequency, it is difficult to design matrix switches for high-frequency electronic signals. Signals on optical carriers are easier to isolate but more difficult to switch. A hybrid technique exploiting passive optical-signal distribution and switching by optoelectronic effects shows good promise for high isolation matrices to handle signals in the dc to 10 GHz range. The key elements for such optoelectronic switches are optical detectors that have switchable sensitivity.Initial efforts in optoelectronic switching used silicon diode detectors and forward bias to establish the off-state. Recent work has turned primarily to photoconductors fabricated in GaAs or other compound semiconductors. Such photoconductors can have very wide response bandwidths and have the advantage of a zero-bias off-state. Efforts have also been made to develop bipolar detectors that do not need forward bias for the off-state.Experimental work has progressed to the demonstration of complete matrices capable of switching up to eight incoming signals to as many outgoing lines, at bandwidths up to 500 MHz and cross-talk levels below 50 dB. Results for individual switching devices give promise of matrices for many tens of lines and bandwidths to several gigahertz. Monolithic integration of GaAs photoconductor switch arrays has been demonstrated, and work progresses to include integrated control devices and amplifiers.Matrix switches of large dimension and very large bandwidth are expected to have significant applications in areas other than communications switching. In particular, such matrices can be used to set up patterns of delay and signal recombination, using fibre delay lines, to provide rapidly selectable wide-band delay for phasing and other applications, or for wide-band tapped delay-line filters that can be reconfigured rapidly.A review of the current status in optoelectronic matrix switching is given.

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