scholarly journals An ultra-flat, low-noise and linearly polarized fiber supercontinuum source covering 670 nm-1390 nm

2021 ◽  
Author(s):  
Etienne Genier
Keyword(s):  
Signal To Noise Ratio ◽  
Extinction Ratio ◽  
Low Noise ◽  
Signal To Noise ◽  
Crystal Fiber ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Imaging And Spectroscopy ◽  
Polarization Extinction Ratio ◽  
Good Agreement

We report an octave-spanning coherent supercontinuum (SC) fiber laser with excellentnoise and polarization properties. This was achieved by pumping a highly birefringent all-normaldispersion (ANDi) photonic crystal fiber with a compact high-power ytterbium femtosecond laserat 1049 nm. This system generates an ultra-flat SC spectrum from 670 nm to 1390 nm with apower spectral density higher than 0.4 mW/nm and a polarization extinction ratio of 17 dB acrossthe entire bandwidth. An average pulse-to-pulse relative intensity noise (RIN) down to 0.54%from 700 nm to 1100 nm has been measured and found to be in good agreement with numericalsimulations. This highly-stable broadband source could find strong potential applications inbiomedical imaging and spectroscopy where improved signal to noise ratio is essential.

scholarly journals An ultra-flat, low-noise and linearly polarized fiber supercontinuum source covering 670 nm-1390 nm

2021 ◽  
Author(s):  
Etienne Genier
Keyword(s):  
Signal To Noise Ratio ◽  
Extinction Ratio ◽  
Low Noise ◽  
Signal To Noise ◽  
Crystal Fiber ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Imaging And Spectroscopy ◽  
Polarization Extinction Ratio ◽  
Good Agreement

We report an octave-spanning coherent supercontinuum (SC) fiber laser with excellentnoise and polarization properties. This was achieved by pumping a highly birefringent all-normaldispersion (ANDi) photonic crystal fiber with a compact high-power ytterbium femtosecond laserat 1049 nm. This system generates an ultra-flat SC spectrum from 670 nm to 1390 nm with apower spectral density higher than 0.4 mW/nm and a polarization extinction ratio of 17 dB acrossthe entire bandwidth. An average pulse-to-pulse relative intensity noise (RIN) down to 0.54%from 700 nm to 1100 nm has been measured and found to be in good agreement with numericalsimulations. This highly-stable broadband source could find strong potential applications inbiomedical imaging and spectroscopy where improved signal to noise ratio is essential.

scholarly journals An ultra-flat, low-noise and linearly polarized fiber supercontinuum source covering 670 nm-1390 nm

2021 ◽  
Author(s):  
Etienne Genier ◽  
Patrick Bowen ◽  
Thibaut Sylvestre
Keyword(s):  
Signal To Noise Ratio ◽  
Extinction Ratio ◽  
Low Noise ◽  
Normal Dispersion ◽  
Crystal Fiber ◽  
Power Spectral ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Imaging And Spectroscopy ◽  
Good Agreement

This papers reports an octave-spanning coherent supercontinuum(SC) fiber laser with excellent noise and polarizationproperties. This was achieved by pumping a highly birefringent all-normal dispersion (ANDi) photonic crystal fiber with a compact high-power ytterbiumfemtosecond laser at 1049 nm. This system generates an ultra-flat SC spectrum from 670 nm to 1390 nm with a power spectral density higher than 0.4 mW/nm and apolarization extinction ratio of 17 dB across the entire bandwidth. An average pulse-to-pulse relative intensity noise (RIN) down to 0.54% from 700 nm to 1100 nmhas been measured and found to be in good agreement with numerical simulations. This highly-stable broadband source could find strong potential applications inbiomedical imaging and spectroscopy where improved signal to noise ratio is essential.

Application of Taguchi method in the optimization of geometric parameters for double pin joint configurations made from glass–epoxy nanoclay laminates

2016 ◽  
Vol 51 (19) ◽  
pp. 2689-2706 ◽  
Author(s):  
Manjeet Singh ◽  
J S Saini ◽  
H Bhunia ◽  
Paramdeep Singh
Keyword(s):  
Taguchi Method ◽  
Signal To Noise Ratio ◽  
Characteristic Curve ◽  
Free Edge ◽  
Geometric Parameters ◽  
Signal To Noise ◽  
Bearing Strength ◽  
Significant Parameter ◽  
Numerical Predictions ◽  
Good Agreement

In the present work, Taguchi method was used for the optimization of geometric parameters for double pin joint configurations. The orthogonal array, the signal-to-noise ratio, and analysis of variance were employed to study the effect of geometric parameters on the bearing strength of the joints. Geometric parameters, i.e. the distance from the free edge of the specimen to the diameter of the first hole (E/D) ratio, width of the specimen to the diameter of the hole (W/D) ratio, the distance between the two holes to the diameter of the hole (P/D) ratio and side width to the diameter of the hole (K/D) ratio were investigated for the serial and parallel hole configurations. The results demonstrate that the E/D ratio is the most significant parameter to increase the bearing strength in both serial and parallel pin joint configurations. Its percentage contribution is about 84.5% and 64.23% in serial and parallel pin joint configurations, respectively. Characteristic curve with Tsai–Wu failure criterion was used for the prediction of the bearing strength in the joints numerically. A good agreement was obtained between experimental results and numerical predictions.

Magnetoelectric Sensors With Directly Integrated Charge Sensitive Readout Circuit—Improved Field Sensitivity and Signal-to-Noise Ratio

2011 ◽  
Vol 11 (10) ◽  
pp. 2260-2265 ◽  
Author(s):  
Zhao Fang ◽  
Ninad Mokhariwale ◽  
Feng Li ◽  
Suman Datta ◽  
Q. M. Zhang
Keyword(s):  
Room Temperature ◽  
Signal To Noise Ratio ◽  
Low Noise ◽  
Magnetic Sensors ◽  
Readout Circuit ◽  
Signal To Noise ◽  
Low Frequencies ◽  
Field Sensitivity ◽  
Piezoelectric Layers ◽  
Noise Ratio

The large magnetoelectric (ME) coupling in the ME laminates makes them attractive for ultrasensitive room temperature magnetic sensors. Here ,we investigate the field sensitivity and signal-to-noise ratio (SNR) of ME laminates, consisting of magnetostrictive and piezoelectric layers (Metglas and piezopolymer PVDF were used as the model system), which are directly integrated with a low noise readout circuit. Both the theoretical analysis and experimental results show that increasing the number of piezoelectric layers can improve the SNR, especially at low frequencies. We also introduce a figure of merit to measure the overall influence of the piezolayer properties on the SNR and show that the newly developed piezoelectric single crystals of PMN-PT and PZN-PT have the promise to achieve a very high SNR and consequently ultra-high sensitivity room temperature magnetic sensors. The results show that the ME coefficients used in early ME composites development works may not be relevant to the SNR. The results also show that enhancing the magnetostrictive coefficient, for example, by employing the flux concentration effect, can lead to enhanced SNR.

scholarly journals Comparing current noise in biological and solid-state nanopores

2019 ◽  
Author(s):  
A. Fragasso ◽  
S. Schmid ◽  
C. Dekker
Keyword(s):  
Solid State ◽  
Single Molecule ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Ionic Current ◽  
Low Noise ◽  
Signal To Noise ◽  
Experimental Conditions ◽  
High Frequencies ◽  
Noise Ratio

AbstractNanopores bear great potential as single-molecule tools for bioanalytical sensing and sequencing, due to their exceptional sensing capabilities, high-throughput, and low cost. The detection principle relies on detecting small differences in the ionic current as biomolecules traverse the nanopore. A major bottleneck for the further progress of this technology is the noise that is present in the ionic current recordings, because it limits the signal-to-noise ratio and thereby the effective time resolution of the experiment. Here, we review the main types of noise at low and high frequencies and discuss the underlying physics. Moreover, we compare biological and solid-state nanopores in terms of the signal-to-noise ratio (SNR), the important figure of merit, by measuring free translocations of a short ssDNA through a selected set of nanopores under typical experimental conditions. We find that SiNx solid-state nanopores provide the highest SNR, due to the large currents at which they can be operated and the relatively low noise at high frequencies. However, the real game-changer for many applications is a controlled slowdown of the translocation speed, which for MspA was shown to increase the SNR >160-fold. Finally, we discuss practical approaches for lowering the noise for optimal experimental performance and further development of the nanopore technology.

scholarly journals Does a Standalone, “Cold” (Low-Thermal-Noise), Linear Resistor Exist Without Cooling?

2018 ◽  
Vol 17 (04) ◽  
pp. 1850030
Author(s):  
Jiaao Song ◽  
Laszlo B. Kish
Keyword(s):  
Thermal Noise ◽  
Cold Resistance ◽  
Signal To Noise Ratio ◽  
Noise Temperature ◽  
Low Noise ◽  
Natural Question ◽  
Signal To Noise ◽  
Nonlinear Resistor ◽  
Technology Corporation ◽  
Thermal Cooling

Classical ways of cooling require some of these elements: phase transition, compressor, nonlinearity, valve and/or switch. A recent example is the 2018 patent of Linear Technology Corporation; they utilize the shot noise of a diode to produce a standalone nonlinear resistor that has [Formula: see text]/2 noise temperature (about 150[Formula: see text]K). While such “resistor” can cool its environment when it is AC coupled to a resistor, the thermal cooling effect is only academically interesting. The importance of the invention is of another nature: In low-noise electronics, it is essential to have resistors with low-noise temperature to improve the signal-to-noise ratio. A natural question is raised: can we use a linear system with feedback to cool and, most importantly, to show reduced noise temperature? Exploring this problem, we were able to produce standalone linear resistors showing strongly reduced thermal noise. Our must successful test shows [Formula: see text]/100 (about 3[Formula: see text]K) noise temperature, as if the resistor would have been immersed in liquid helium. We also found that there is an old solution offering similar results utilizing the virtual ground of an inverting amplifier at negative feedback. There, the “cold” resistor is generated at the input of an amplifier. On the other hand, our system generates the “cold” resistance at the output, which can have practical advantages.

Interferometric optical signal-to-noise ratio measurements of telecom signals with degraded extinction ratio

2008 ◽  
Vol 33 (18) ◽  
pp. 2065 ◽  
Author(s):  
J. M. Oh ◽  
M. Brodsky ◽  
L. E. Nelson ◽  
G. Cadena ◽  
M. D. Feuer
Keyword(s):  
Signal To Noise Ratio ◽  
Extinction Ratio ◽  
Optical Signal ◽  
Signal To Noise ◽  
Noise Ratio

scholarly journals Improving the Signal to Noise Ratio of QTF Preamplifiers Dedicated for QEPAS Applications

2020 ◽  
Vol 10 (12) ◽  
pp. 4105
Author(s):  
Piotr Z. Wieczorek ◽  
Tomasz Starecki ◽  
Frank K. Tittel
Keyword(s):  
Operational Amplifier ◽  
Narrow Band ◽  
Signal To Noise Ratio ◽  
Low Frequency ◽  
Electrical Signal ◽  
Low Noise ◽  
Detection Sensitivity ◽  
Noise Amplitude ◽  
Signal To Noise ◽  
Noise Ratio

The signal-to-noise ratio (SNR) is a major factor that limits the detection sensitivity of quartz-enhanced photoacoustic spectroscopy (QEPAS) sensors. The higher the electrical signal level compared to the noise amplitude is the lower the concentration of gases that can be detected. For this reason the preamplifier circuits used in QEPAS should be optimized for low-frequency narrow-band applications. Moreover, special care should be taken when choosing a particular operational amplifier in either a transimpedance or voltage (differential) configuration. It turns out that depending on the preamp topology different operational amplifier parameters should be carefully considered when a high SNR of the whole QEPAS system is required. In this article we analyzed the influence of the crucial parameters of low-noise operational preamplifiers used in QEPAS applications and show the resulting limitations of transimpedance and voltage configurations.

Measurement of Linearly Polarized Light Rotation Applied in Atomic Magnetometer

2013 ◽  
Vol 753-755 ◽  
pp. 2149-2152
Author(s):  
Qiang Liu ◽  
Yu Dan Sun ◽  
Qiang Huang ◽  
Xian Jin Zeng ◽  
Jun Hai Zhang ◽  
...  
Keyword(s):  
Faraday Effect ◽  
Beam Splitter ◽  
Optical Glass ◽  
Signal To Noise Ratio ◽  
Optical Rotation ◽  
Polarized Light ◽  
Signal To Noise ◽  
Rotational Angle ◽  
Linearly Polarized ◽  
Lock In

The measurement of linearly polarized light rotation is the key technique in atomic magnetometer. It influences the sensitivity of atomic magnetometer directly. The basic principle of polarizer beam splitter detecting was analyzed. The ZF7 optical glass and solenoid were used to generate standard small angle based on Faraday effect. The signal of AC rotational angle was extracted by lock-in amplifier. The experiment proved that the method can measure 8×10-7rad small optical rotation. As the linearly polarized light rotation is 20mrad in atomic magnetometer, the signal to noise ratio reaches 25000.

Sign in / Sign up

Export Citation Format

Share Document