Hybrid Integrated Nanophotonic Silicon-based Structures

We report nanophotonic silicon-based devices for hybrid integration: 1D photonic crystal (PhC) on optical fiber, i. e. fiber Bragg grating (FBG) sensing probe integrated in fiber laser structure for chemical sensors and slotted planar 2D PhC cavity combined with carbon nanotube (CNT) towards light nanosources. The experiments have been carried out by integrating 1D PhC on optical fiber in fiber laser structure. This structure possesses many advantages including high resolution for wavelength shift, high optical signal-to-noise ratio (OSNR) of about 50~dB, the small full width at half-maximum (FWHM) of about 0.014~nm therefore its accuracy is enhanced, as well as the precision and capability are achieved for remote sensing. Low nitrate concentration in water from 0 to 80 ppm has been used to demonstrate its sensing ability in the experiment. The proposed sensor can work with good repeatability, rapid response, and its sensitivity can be obtained of \(3.2\times 10^{ - 3}\) nm/ppm with the limit of detection (LOD) of 3~ppm. For 2D PhC cavity, enhancement of photoluminescence of CNT emission is observed. The semiconducting single-walled carbon nanotubes (s-SWNTs) solution was prepared by polymer-sorted method and coupled with the confined modes in silicon slotted PhC cavities. The enhancement ratio of 1.15 is obtained by comparing between the PL peaks at two confined modes of the cavity. The PL enhancement result of the integrated system shows the potential for the realization of on-chip nanoscale sources.

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Development of an Optical Fiber Sensor with a D-shaped Fiber Bragg Grating Integrated in a Loop-mirror Optical Fiber Laser as a High Sensitivity Refractometer

Communications in Physics ◽

10.15625/0868-3166/16014 ◽

2021 ◽

Vol 32 ◽

Author(s):

Binh Pham Thanh ◽

Thuy Van Nguyen ◽

Van Hoi Pham ◽

Huy Bui ◽

Thi Hong Cam Hoang ◽

...

Keyword(s):

Refractive Index ◽

Optical Fiber ◽

Fiber Laser ◽

Fiber Bragg Grating ◽

Limit Of Detection ◽

Optical Fiber Sensor ◽

High Sensitivity ◽

Optical Signal ◽

Bragg Grating ◽

Loop Mirror

In this paper, we report a new type of refractometer based on a D-shaped fiber Bragg grating (FBG) integrated in a loop-mirror optical fiber laser. This proposed sensor is used in wavelength interrogation method, in which the D-shaped FBG is applied as a refractive index (RI) sensing probe and a mirror to select mode of laser. The D-shaped FBG is prepared by the removal of a portion of the fiber cladding covering the FBG by means of side-polishing technique. The D-shaped FBG sensing probe integrated in a loop-mirror optical fiber laser with saturated pump technique, the characteristics of sensing signals have been improved to obtain stable intensity, narrower bandwidth and higher optical signal-to-noise ratio compare to normal reflection configuration. The limit of detection (LOD) of this sensor can be achieved to 2.95 x 10-4 RIU in the refractive index (RI) range of 1.42-1.44. Accordingly, we believe that the proposed refractometer has a huge potential for applications in biochemical-sensing technique.

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A Theoretical Study and Numerical Simulation of a Quasi-Distributed Sensor Based on the Low-Finesse Fabry-Perot Interferometer: Frequency-Division Multiplexing

10.20944/preprints201704.0001.v1 ◽

2017 ◽

Author(s):

José Trinidad Guillen Bonilla ◽

Alex Guillén-Bonilla ◽

Rodríguez-Betancourtt Veronica M. ◽

Héctor Guillen Bonilla ◽

Antonio Casillas Zamora

Keyword(s):

Optical Fiber ◽

Frequency Domain ◽

Signal To Noise Ratio ◽

Single Mode ◽

Optical Signal ◽

Single Mode Fiber ◽

Wavelength Shift ◽

Distributed Sensors ◽

Distributed Sensor ◽

Fabry Perot

The application of the sensors optical fiber in the areas of scientific instrumentation and industrial instrumentation is very attractive due to its numerous advantages. In the industry of civil engineering for example, quasi-distributed sensors made with optical fiber are used for reliable strain and temperature measurements. Here, a quasi-distributed sensor in the frequency domain is discussed. The sensor consists of a series of low-finesse Fabry-Perot interferometers where each Fabry-Perot interferometer acts as a local sensor. Fabry-Perot interferometers are formed by pairs of identical low reflective Bragg gratings imprinted in a single mode fiber. All interferometer sensors have different cavity length, provoking the frequency-domain multiplexing. The optical signal represents the superposition of all interference patterns which can be decomposed using the Fourier transform. The frequency spectrum is analyzed and sensor´s properties were defined. Following, a quasi-distributed sensor was numerically simulated. Our sensor simulation considers sensor properties, signal processing, noise system and instrumentation. The numerical results show the behavior of resolution vs. signal-to-noise ratio. From our results, the Fabry-Perot sensor has high resolution and low resolutions. Both resolutions are conceivable because the FDPA algorithm elaborates two evaluations of Bragg wavelength shift

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Microdrilled tapers to enhance optical fiber lasers for sensing

Scientific Reports ◽

10.1038/s41598-021-00046-7 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

R. A. Perez-Herrera ◽

M. Bravo ◽

P. Roldan-Varona ◽

D. Leandro ◽

L. Rodriguez-Cobo ◽

...

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Fiber Lasers ◽

Signal To Noise Ratio ◽

Power Level ◽

Single Mode ◽

Optical Signal ◽

Single Mode Fiber ◽

Output Power Level ◽

Linear Cavity

AbstractIn this work, an experimental analysis of the performance of different types of quasi-randomly distributed reflectors inscribed into a single-mode fiber as a sensing mirror is presented. These artificially-controlled backscattering fiber reflectors are used in short linear cavity fiber lasers. In particular, laser emission and sensor application features are analyzed when employing optical tapered fibers, micro-drilled optical fibers and 50 μm-waist or 100 μm-waist micro-drilled tapered fibers (MDTF). Single-wavelength laser with an output power level of about 8.2 dBm and an optical signal-to-noise ratio of 45 dB were measured when employing a 50 μm-waist micro-drilled tapered optical fiber. The achieved temperature sensitivities were similar to those of FBGs; however, the strain sensitivity improved more than one order of magnitude in comparison with FBG sensors, attaining slope sensitivities as good as 18.1 pm/με when using a 50 μm-waist MDTF as distributed reflector.

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An Advanced, Silicon-Based Substrate for Sensitive Nucleic Acids Detection

Sensors ◽

10.3390/s18093138 ◽

2018 ◽

Vol 18 (9) ◽

pp. 3138 ◽

Cited By ~ 2

Author(s):

Salvatore Petralia ◽

Nunzio Vicario ◽

Giovanna Calabrese ◽

Rosalba Parenti ◽

Sabrina Conoci

Keyword(s):

Limit Of Detection ◽

Optical Signal ◽

Fluorescent Label ◽

Capture Probe ◽

Microarray Technology ◽

Probe Sequence ◽

B Virus ◽

Nucleic Acids Detection ◽

Silicon Based ◽

Dynamic Linear Range

Surface substrate and chemical functionalization are crucial aspects for the fabrication of the sensitive biosensor based on microarray technology. In this paper, an advanced, silicon-based substrate (A-MA) allowing enhancement of optical signal for microarray application is described. The substrate consists in a multilayer of Si/Al/SiO2 layers. The optical signal enhancement is reached by a combination of the mirror effect of Al film and the SiO2 thickness around 830 nm, which is able to reach the maximum of interference for the emission wavelength of the Cy5 fluorescent label. Moreover, SiO2 layer is suitable for the immobilization of single-strand DNA through standard silane chemistry, and probe densities of about 2000 F/um2 are reached. The microarray is investigated in the detection of HBV (Hepatitis B Virus) pathogen with analytical samples, resulting in a dynamic linear range of 0.05–0.5 nM, a sensitivity of about 18000 a.u. nM−1, and a Limit of Detection in the range of 0.031–0.043 Nm as a function of the capture probe sequence.

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The Application of Pseudo-Random Sequence in the Properties Measurement of Polymer Optical Fiber

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.313-314.653 ◽

2013 ◽

Vol 313-314 ◽

pp. 653-657

Author(s):

Yan Chun Wang ◽

Chang Wei Sun

Keyword(s):

Optical Fiber ◽

Output Signal ◽

Signal To Noise Ratio ◽

Random Sequence ◽

Measuring Method ◽

Optical Signal ◽

Polymer Optical Fiber ◽

Photoelectric Conversion ◽

Noise Interference ◽

Labview Software

A new method for the properties measurement of polymer optical fiber (POF) using pseudo-random sequence is introduced. The light source modulated by pseudo-random sequence is injected into the POF. The output optical signal after photoelectric conversion is made the correlation detection with pseudo-random sequence, and finally the correlation operation is carried out based on Labview software. Because pseudo-random sequence performs well on randomicity and it has the correlation properties similar to that of white noise, interference and noise have little influence on the peak of correlation function during the measurement, and the signal-to-noise ratio (SNR) of the output signal can be improved obviously. The measuring method is studied both theoretically and experimentally. Experimental results show that the SNR of the output signal can be improved by 25~40dB for the signal with SNR-15dB to 6dB, and the measuring precision is improved by this method.

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Hybrid Raman-Erbium Random Fiber Laser with a Half Open Cavity Assisted by Artificially Controlled Backscattering Fiber Reflectors

10.21203/rs.3.rs-192136/v1 ◽

2021 ◽

Author(s):

R. A. Perez-Herrera ◽

P. Roldan-Varona ◽

M. Galarza ◽

S. Sañudo-Lasagabaster ◽

L. Rodriguez-Cobo ◽

...

Keyword(s):

Fiber Laser ◽

Output Power ◽

Signal To Noise Ratio ◽

Power Level ◽

Laser Cavity ◽

Gain Medium ◽

Optical Signal ◽

Open Cavity ◽

Output Power Level ◽

Erbium Doped

Abstract A hybrid Raman-erbium random fiber laser (RFL) with a half-open cavity assisted by chirped artificially controlled backscattering fiber reflectors (ACBFRs) is presented. A combination of 2.4 km of dispersion compensating fiber (DCF) with two highly erbium-doped fiber (EDF) pieces of 5 m length was used as gain medium. A single random laser emission line centered at 1553.8 nm with an output power level of -6.5 dBm and an optical signal to noise ratio (OSNR) of 47 dB was obtained when pumped at 37.5 dBm. A full width at half maximum (FHWM) of 1 nm and a 100% confidence level (CL) output power instability as low as 0.08 dB were measured. The utilization of the new laser cavity as a temperature and strain sensor is also experimentally studied.

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Widely tunable, high optical signal-to-noise ratio erbium-doped photonic crystal fiber laser suitable for acetylene sensing

Optics & Laser Technology ◽

10.1016/j.optlastec.2018.07.035 ◽

2019 ◽

Vol 109 ◽

pp. 525-533 ◽

Cited By ~ 1

Author(s):

Min Zhang ◽

Xuesen Zhong ◽

Wanjun Zheng ◽

Shuangchen Ruan ◽

Bin Du ◽

...

Keyword(s):

Photonic Crystal ◽

Fiber Laser ◽

Photonic Crystal Fiber ◽

Signal To Noise Ratio ◽

Optical Signal ◽

Signal To Noise ◽

Crystal Fiber ◽

Erbium Doped ◽

Noise Ratio

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A Lamping U-Shaped Fiber Biosensor Detector for MicroRNA

Sensors ◽

10.3390/s20051509 ◽

2020 ◽

Vol 20 (5) ◽

pp. 1509

Author(s):

Hsin-Yi Wen ◽

Chun-Wei Huang ◽

Yu-Le Li ◽

Jing-Luen Chen ◽

Yao-Tsung Yeh ◽

...

Keyword(s):

Optical Fiber ◽

Silicon Dioxide ◽

Self Assembly ◽

Transmission Loss ◽

Limit Of Detection ◽

Fiber Surface ◽

Coefficient Of Determination ◽

Wavelength Shift ◽

Good Sensitivity ◽

Microrna Detection

This study presents a U-shaped optical fiber developed for a facile application of microRNA detection. It is fabricated by the lamping process and packaged in a quartz tube to eliminate human negligence. In addition, silanization and electrostatic self-assembly are employed to bind gold nanoparticles and miRNA-133a probe onto the silicon dioxide of the fiber surface. For Mahlavu of hepatocellular carcinoma (HCC), detection is determined by the wavelength shift and transmission loss of a U-shaped optical fiber biosensor. The spectral sensitivity of wavelength and their coefficient of determination are found at −218.319 nm/ ng/mL and 0.839, respectively. Concurrently, the sensitivity of transmission loss and their coefficient of determination are found at 162.394 dB/ ng/mL and 0.984, respectively. A method for estimating the limit of detection of Mahlavu is at 0.0133 ng/mL. The results show that the proposed U-shaped biosensor is highly specific to miRNA-133a and possesses good sensitivity to variations in specimen concentration. As such, it could be of substantial value in microRNA detection.

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Graphite Saturable Absorber for Q-Switched Fiber Laser

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i4.30.22303 ◽

2018 ◽

Vol 7 (4.30) ◽

pp. 334

Author(s):

Yushazlina R. Yuzaile ◽

Noor A. Awang ◽

Zahariah Zakaria ◽

Noor U.H.H Zalkepali ◽

Amirah A. Latif ◽

...

Keyword(s):

Fiber Laser ◽

Saturable Absorber ◽

Pulse Width ◽

Modulation Depth ◽

Signal To Noise Ratio ◽

Optical Signal ◽

Signal To Noise ◽

Saturation Intensity ◽

Maximum Pulse Energy ◽

Optical Fiber Applications

This paper reported a successful demonstration on Q-switched fiber laser by using graphite as saturable absorber (SA). The graphite is deposited on the fiber ferrule through a simple mechanical exfoliation method. The modulation depth of the graphite SA is 19.2% with a saturation intensity of 85 MW/cm². The maximum achievable pulse repetition rates and pulse width are 42.41 kHz and 3.40 μs respectively. Meanwhile, its optical signal-to-noise ratio is about 50.81 dB. The Q-switched pulses have the maximum pulse energy of 5.84 nJ. These outcomes demonstrated that a stable output of passively Q-switched fiber laser is produced and can be applied for various optical fiber applications.

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