scholarly journals Design of a pixel scale optical power meter suitable for incorporation in a multitechnology FPGA

2003 ◽  
Author(s):  
Prerna Patel ◽  
Prosenjit Mal ◽  
Fred R. Beyette, Jr.
Keyword(s):  
Optical Power ◽  
Power Meter ◽  
Pixel Scale

An Optical Fiber Sensing Network Supporting Weak Optical Signal Detection and a Neural Network Method for Information Collection

2021 ◽  
Vol 16 (2) ◽  
pp. 188-195
Author(s):  
Keyuan Liu ◽  
Haibin Li ◽  
Ya Wang
Keyword(s):  
Neural Network ◽  
Optical Fiber ◽  
Signal Detection ◽  
Mobile Phone ◽  
Optical Power ◽  
Information Collection ◽  
Identification System ◽  
Power Meter ◽  
Fiber Sensing ◽  
Optical Fiber Sensing

The weak direct current (DC) signals detected and converted by the photodetector are output to the mobile phone by voltage/frequency switching, and the signals are processed by the mobile phone APP and audio conversion module. The photodetector is equipped with the automatic switching function to design an optical power meter and detect weak signals. Meanwhile, the optical cable identification system is analyzed and combined with the optical power meter to generate an optical fiber sensing network to improve the weak alternating current (AC) signal detection. This network needs data fusion in sensor nodes’ data collection. The cluster routing protocol is introduced and combined with the back propagation neural network (BPNN) to propose a method suitable for this photoelectric transmission and improve the information fusion and accuracy. In the experiment, the optical power meter is output in gears first, and the output waveforms are normal. The photodiode’s optical power is adjusted to obtain different frequencies on the oscilloscope. In the proposed optical fiber sensing network, weak AC signals are amplified significantly, and different optical fiber lines can be distinguished in the optical cables. The proposed information collection method can reduce network communication and node energy consumption.

scholarly journals Macrobending Loss Analysis on Singlemode-Multimode-Singlemode Fiber Optic Core

2019 ◽  
Vol 9 (2) ◽  
pp. 11-15
Author(s):  
Sisca Arisya Harry Andhina
Keyword(s):  
Light Source ◽  
Optical Fibers ◽  
Fiber Optic ◽  
Optical Power ◽  
Single Mode ◽  
Fiber Optic Cable ◽  
Power Meter ◽  
Loss Analysis ◽  
Measurement Results ◽  
Source Test

Macrobending often occurs in optical fibers that embedded in the ground due to shifting of soil or rocks in the ground causing interference in transmission. In this study used single-mode-multimode-singlemode fiber optic cable connected manually and axially measured using a light source test equipment and optical power meter and the results will be compared. The measurement results obtained the greater  value of macrobending losses with the smaller the diameter of the winding, and the greater the number of turns. The highest value of macrobending losses in multimode cables is -1.48dB at 0.5cm diameter with 5 turns, highest value of macrobending losses on single mode cables is -12.73dB at 0.5cm diameter with 5 turns,  lowest value of macrobending losses for multimode cables is -0.44dB at 5cm diameter with 1 twist, lowest macrobending losses in singlemode cables is -1.69dB at 5cm diameter with 1 twist. While the value of macrobending losses on axially connected SMS cables shows the highest value of macrobending losses on multimode cables is -1.12dB in diameter of 0.5cm with 5 turns,  highest value of macrobending losses on singlemode cables is -1.18dB at diameter of 0.5cm with 5 turns,  lowest value for macrobending losses on multimode cables is -0.66dB at 5cm in diameter with 1 twist, the smallest value for macrobending losses on singlemode cables is -0.27dB at 5cm diameter with 1 twist . The measurement results also showed that the macrobending losses of manually connected SMS cables were greater than the macrobending losses of axially connected SMS cables.

scholarly journals Design and Research of a Color Discrimination Method for Polycrystalline Silicon Cells Based on Laser Detection System

2019 ◽  
Vol 9 (20) ◽  
pp. 4468
Author(s):  
Zijian Chen ◽  
Shiyu Wang ◽  
Lian Zhang ◽  
Zenghong Ma
Keyword(s):  
Polycrystalline Silicon ◽  
Detection System ◽  
Measurement Data ◽  
Optical Power ◽  
Color Discrimination ◽  
Laser Detection ◽  
Coaxial System ◽  
Power Meter ◽  
Optical Shutters ◽  
Silicon Cell

In this paper, a method of color discrimination based on sample sensitivity to light wavelength is proposed based on the reflection spectra of a large number of samples and the statistical calculation of the measurement data. A laser detection system is designed to realize the color discrimination. For the color discrimination of polycrystalline silicon cells, the most sensitive wavelength, 434 nm, and the least sensitive wavelength, 645 nm, of polycrystalline silicon cells is obtained according to this method. A laser detection system was built to measure the polycrystalline silicon cells. This system consists of two lasers, optical shutters, collimating beam expanding systems, an optical coaxial system, sample platform, collecting lens, and optical power meter or optical sensor. Two laser beams of different wavelengths are beamed coaxially through the optical coaxial system onto a polycrystalline silicon cell and are reflected or scattered. The reflected or scattered lights are collected through a lens with a high number aperture and received separately by the optical power meter. Then the color value of the polycrystalline silicon cell in this system is characterized by the ratio of light intensity data received. The system measured a large number of previous polycrystalline silicon cells to form the different color categories of polycrystalline silicon cells of this system in the computer database. When a new polycrystalline silicon cell is measured, the color discrimination system can automatically classify the new polycrystalline silicon cell to a certain color category in order to achieve color discrimination.

Usage of Optical Power Meter in Passive Optical Networks

2011 ◽  
Vol 30 (5) ◽  
pp. 308-321 ◽  
Author(s):  
Edvin Skaljo ◽  
Aljo Mujcic ◽  
Nermin Suljanovic
Keyword(s):  
Optical Networks ◽  
Optical Power ◽  
Passive Optical Networks ◽  
Power Meter

scholarly journals Desain Sensor Kelembapan Relatif Udara Menggunakan Fiber Optik

2021 ◽  
Vol 11 (4) ◽  
pp. 214-219
Author(s):  
Rangga Pradana Marya ◽  
Yoyok Heru Marya ◽  
Mila Marya
Keyword(s):  
Light Source ◽  
Optical Power ◽  
Power Meter ◽  
Fiber Coupler

Kelembapan udara menjadi faktor penting dalam kehidupan manusia yaitu untuk menjaga kesetabilan kesehatan tubuhyang jugai akan berpengaruh kepada kenyamanan kerja. Diperlukan sensor untuk mengetahui kelembapan dalam ruangan. Alat bisa dikatakan sensor jika memiliki linearitas dan sensitivitas, dalam hal ini fiber optik cocok untuk sensor dikarenakan kemampuan alaminya yang tahan terhadap gangguan elektromagnetik, tahan terhadap suhu tinggi, memiliki sensitivitas dan fleksibelitas yang tinggi, dan dapat digunakan untuk pengukuran dan penginderaan jauh. Penelitian ini menggunakan 2 buah kabel patch core singlemode SC-SC yang dihubungkan dengan fiber coupler yang telah diberi lubang bagian tengahnya dengan diameter 1mm dan diberi jarak antar ferullenya sebasar 0.3mm, 0.6mm, 0.8mm, 1mm. Optical light source digunakan untuk memberikan masukan dengan nilai -7dBm dan nilai keluaran akan dibaca oleh Optical power meter yang nantinya akan diolah menjadi loss daya kemudian dibandingkan dengan nilai kelembapan relatif dari Hygrometer dan akan diperoleh persamaan linearnya. Hasil pengukuran didapatkan semakin jauh jarak antar ferulle maka range yang didapat juga akan semakin panjang. Range terpanjang didapat pada pengukuran jarak 1mm dengan selisih loss daya sebesar 0.2dB dan range terpendek didapat pada pengukuran 0.3mm dengan selisih loss daya sebesar 0.08dB.

Photoacoustic optical power meter using piezoelectric detection

1988 ◽  
Vol 21 (2) ◽  
pp. 195-196 ◽  
Author(s):  
S B Perelta ◽  
H H Al-Khafaji ◽  
A W Williams
Keyword(s):  
Optical Power ◽  
Piezoelectric Detection ◽  
Power Meter

Cascaded stages of parametric optical fiber amplifiers with Raman fiber amplifiers for upgrading of telecommunication networks through optical wireless communication channel

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahmoud M.A. Eid ◽  
Eslam Shehata ◽  
Ahmed Nabih Zaki Rashed
Keyword(s):  
Optical Fiber ◽  
Electrical Power ◽  
Optical Power ◽  
Optical Signal ◽  
Electrical Signal ◽  
Telecommunication Networks ◽  
Fiber Amplifiers ◽  
Total Power ◽  
Q Factor ◽  
Power Meter

Abstract This paper contains a main model which concludes a two optical fiber cable along 70 km and with Parametric/Raman amplifiers with a result of total power 0.781 dBm that computed by the optical power meter which is located before the receiver part and the second optical fiber channel, a total power −44.186 dBm at the end of model which is computed by the electrical power meter visualizer, and a max. Q factor 2.548 computed by the BER analyzer. The suggested model has outlined some updates on the previous model to improve the results so that the results are increased at the same length as the following: total power of optical signal becomes 10.039 dBm, total power of electrical signal becomes 0.624 dBm, and the max. Q factor becomes 9.60787.

Design and Linear Fitting of High Sensitive Optical Power Meter

2010 ◽  
Vol 171-172 ◽  
pp. 429-432
Author(s):  
Wen Jia Lu ◽  
Yi Wei ◽  
Yi Fan Zhao
Keyword(s):  
Dynamic Range ◽  
Optical Power ◽  
High Sensitivity ◽  
Measured Data ◽  
Construction Monitoring ◽  
Linear Fitting ◽  
Power Meter ◽  
Standard Data ◽  
Measurement Results ◽  
Multi Wavelength

This paper introduces the hardware design of digital optical power meters and the algorithm flow.The power meter detector, with InGaAs-PIN photodiode and LTC6078,is used as a preamplifier for the measurement of micro-current;Silicon Laps C8051f410 are selected as the micro-controller for AD quantification and data processing, and the linear fitting of the measured data and standard data is completed in Matlab environment.After the comparison between the two measurement results,the proposed optical power meter adopts certain algorithm to compensate the deviation and improve the overall performance.The analyses of measured data show that:the optical power meter can be designed to precisely measure multi-wavelength with wide dynamic range and high sensitivity,support AC and DC dual power supply,and be portable.Therefore It also can be used both by university laboratories for teaching and by government department for construction monitoring and optical communications maintenance.

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