The Experts below are selected from a list of 2202 Experts worldwide ranked by ideXlab platform

Gabriel M. Rebeiz - One of the best experts on this subject based on the ideXlab platform.

  • A wide-band monolithic quasi-Optical Power Meter for milliMeter- and submilliMeter-wave applications
    IEEE Transactions on Microwave Theory and Techniques, 1991
    Co-Authors: C.c. Ling, Gabriel M. Rebeiz
    Abstract:

    A novel monolithic Power Meter has been developed for submilliMeter-wave applications (100 GHz to 10 THz). The detector is a large-area bismuth boloMeter integrated on a 1.2- mu m-thick dielectric membrane. This approach results in a wide-band, high-responsivity detector. The Power Meter is simple to fabricate, is inexpensive, and can be easily calibrated using a low-frequency network. Quasi-Optical measurements at 90, 140, and 240 GHz show that the boloMeter is polarization-independent and could be modeled by a simple transmission line model. Absolute Power measurements at 90, 140, and 240 GHz show a +or-5% accuracy and agree well with a calibration Anritsu Power Meter at 90 GHz. Potential application areas are Power calibration, antenna coupling efficiency measurements, and absolute Power measurements from solid-state devices and far-infrared lasers at submilliMeter wavelengths. Absolute output Power measurements on a 220-280 GHz tripler using the quasi-Optical Power Meter are presented as an application example. >

  • A wideband monolithic submilliMeter-wave quasi-Optical Power Meter
    IEEE International Digest on Microwave Symposium, 1
    Co-Authors: C.c. Ling, Gabriel M. Rebeiz
    Abstract:

    A novel monolithic Power Meter has been developed for submilliMeter-wave applications (100 GHz to 10 THz). The detector is a 4-mm*4-mm bismuth boloMeter integrated on a 1.2- mu m-thick dielectric membrane. This approach results in a wideband high-responsivity detector. The Power Meter is simple to fabricate, inexpensive, and can be easily calibrated using a low-frequency network. Quasi-Optical measurements at 185 GHz show that the boloMeter is polarization independent, acts as a Lambertian surface, and could be modeled by a simple transmission line model. The measured low-frequency responsivity for a 70- Omega boloMeter, at a bias of 1 V and a video modulation of 300 Hz, is around 1 V/W. The NEP of the detector is around 3 nWHz/sup -1/2/. Potential application areas are antenna coupling efficiency measurements and absolute Power measurements at submilliMeter wavelengths. >

Hafida, Nura Hajar - One of the best experts on this subject based on the ideXlab platform.

  • Analisis Sensor Pengukuran Konsentrasi Glukosa Prinsip Macrobending Pada Serat Optik Multimode Step-Index
    2018
    Co-Authors: Hafida, Nura Hajar
    Abstract:

    Telah dikembangkan sensor konsentrasi glukosa dengan prinsip macrobending dari serat optik multimode step-index dengan variasi panjang kupasan 2 cm, 3 cm, dan 4 cm. Setiap panjang kupasan dilengkungkan dengan diaMeter kelengkungan 2 cm, 3 cm, dan 4 cm. Larutan glukosa yang diuji memiliki konsentrasi 0% (aquades), 5%, 10%, 15% dan 25%. Sumber cahaya yang digunakan LED dengan panjang gelombang 660 nm dan detektor yang digunakan yaitu BF5R-D1-N yang telah dikalibrasi dengan menggunakan Optical Power Meter. Dari hasil pengukuran diperoleh bahwa semakin besar diaMeter kelengkungan serat optik semakin besar pula daya keluaran, dan semakin panjang daerah kupasan semakin kecil daya keluaran. ================ A Glucose concentration sensor has been developed with macrobending principle on multimode step-index Optical fiber with variation of peel length 2 cm, 3 cm, and 4 cm. Each peel long curved with curvature diaMeter of 2cm, 3 cm, dan 4 cm. The tested glucose solution had a concentration of 0% (aquades), 5%, 10%, 15% and 25%. A BF5R-D1-N is used as light source and detector which has been calibrated by using Optical Power Meter. The results of experiment show that correlation between Optical Power output with curvature diaMeter, and also peeling area of Optical fiber

  • Analisis Sensor Pengukuran Konsentrasi Glukosa Prinsip Macrobending pada Serat Optik Multimode Step-Index
    'Lembaga Penelitian dan Pengabdian kepada Masyarakat ITS', 2018
    Co-Authors: Hafida, Nura Hajar, Rubiyanto Agus
    Abstract:

    Sensor konsentrasi glukosa dengan prinsip macrobending pada serat optik multimode step-index dengan variasi panjang kupasan 2 cm, 3 cm, dan 4 cm. Setiap panjang kupasan dilengkungkan dengan diaMeter kelengkungan 2 cm, 3 cm, dan 4 cm. Larutan glukosa yang diuji memiliki konsentrasi 0% (aquades), 5%, 10%, 15% dan 25%. Sumber cahaya yang digunakan LED dengan panjang gelombang 660 nm dan detektor yang digunakan yaitu BF5R-D1-N yang telah dikalibrasi dengan menggunakan Optical Power Meter. Dari hasil yang diperoleh semakin besar diaMeter kelengkungan serat optik semakin besar pula daya keluaran, dan semakin panjang daerah kupasan semakin kecil daya keluaran

Youngjoo Chung - One of the best experts on this subject based on the ideXlab platform.

  • Intensity-based Optical fiber strain sensor using long-period fiber gratings and a core mode blocker
    Measurement Science and Technology, 2009
    Co-Authors: Dusun Hwang, Linh Viet Nguyen, Dae Seung Moon, Youngjoo Chung
    Abstract:

    We report an intensity-based fiber strain sensor using a pair of long-period fiber gratings (LPFGs) and an in-line core mode blocker. By inserting a core mode blocker fabricated by the arc discharge method between two LPFGs, a band-pass filter can be formed. We used an LED and an Optical Power Meter to measure the transmittance near the resonance wavelength of the LPFGs and we obtained a relation between the axial strain applied on one of the LPFGs and the transmitted Power. The measurement results indicate that the sensitivity of the Power Meter output voltage to the applied strain is 6.37 pV με −1 .

  • Intensity based Optical fiber strain sensor using long period grating and core mode blocker
    19th International Conference on Optical Fibre Sensors, 2008
    Co-Authors: Dusun Hwang, Dae Seung Moon, Linh Nguyen, Youngjoo Chung
    Abstract:

    We report an intensity based fiber strain sensor using a long period grating (LPG) pair along with an in-line core mode blocker. By sandwiching the core mode blocker fabricated by arc method between a LPG pair, an band-pass filter was formed. Measured by Optical Power Meter at one specific wavelength, the transmitted Power was found to decrease as a variation of axial strain is applied on one single LPFG, therefore we can measure the applied strain by measuring the transmitted Power. The measured response of voltage for change of strain was 6.37pV/ μe.

Aljo Mujcic - One of the best experts on this subject based on the ideXlab platform.

  • Usage of Optical Power Meter in Passive Optical Networks
    Fiber and Integrated Optics, 2011
    Co-Authors: Edvin Skaljo, Aljo Mujcic, Nermin Suljanovic
    Abstract:

    Abstract The aim of this study is to investigate the use of an Optical Power Meter in the field of passive Optical networks. This instrument can provide certain spatial information about the fault at the physical layer in a passive Optical network with cascade architecture, which is not possible in other Optical networks. Attenuation of the Optical path from the single Optical network unit to the central office can be obtained by inserting a splitter 2/1 and measuring a difference in Optical Powers in the “on” and “off” states of this unit. The presented test results show the accuracy of measurement better than 2.5%.

  • measurement of Optical Power in the upstream of pon signal from a single onu at the side of the central office by Optical Power Meter
    International Conference on Ultra Modern Telecommunications, 2010
    Co-Authors: Edvin Skaljo, Aljo Mujcic
    Abstract:

    The paper presents a method for the attenuation measurement of the Optical path from ONU to OLT in GPON network. Optical Power Meter is connected to the fiber section via splitter in central office receiving Optical signal from all ONU's. Optical Power difference is measured in upstream signal with desired ONU in “on” or “off” state. The difference has a linear relationship with user's bandwidth. Finally paper describes an experimental setup for confirmation of proposal, the results differ by 2,5% from theoretically calculated. The system will improve the service reliability and reduce the maintenance cost.

  • ICUMT - Measurement of Optical Power in the upstream of PON signal from a single ONU at the side of the central office by Optical Power Meter
    International Congress on Ultra Modern Telecommunications and Control Systems, 2010
    Co-Authors: Edvin Skaljo, Aljo Mujcic
    Abstract:

    The paper presents a method for the attenuation measurement of the Optical path from ONU to OLT in GPON network. Optical Power Meter is connected to the fiber section via splitter in central office receiving Optical signal from all ONU's. Optical Power difference is measured in upstream signal with desired ONU in “on” or “off” state. The difference has a linear relationship with user's bandwidth. Finally paper describes an experimental setup for confirmation of proposal, the results differ by 2,5% from theoretically calculated. The system will improve the service reliability and reduce the maintenance cost.

Xinyong Dong - One of the best experts on this subject based on the ideXlab platform.

  • Fiber bragg grating‐based load sensor without temperature dependence
    Microwave and Optical Technology Letters, 2012
    Co-Authors: Xinyong Dong, Shangzhong Jin, Shuqin Zhang, Yunpeng Wang, Chi Chiu Chan, Perry Ping Shum
    Abstract:

    A novel load sensor has been proposed and demonstrated by embedding a fiber Bragg grating (FBG) into a tapered cylindrical polymer rod. Load-induced nonuniform strain field changes the bandwidth, and hence, the reflected Optical Power of the FBG. Temperature-insensitive measurement of load has been realized by measuring the reflected Optical Power with only a low-cost Optical Power Meter. Load measurement sensitivity of 5.0 nW/N has been experimentally achieved within a range up to 1800 N. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:930–933, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26695

  • A fiber loop mirror temperature sensor demodulation technique using a long-period grating in a photonic crystal fiber and a band-pass filter.
    The Review of scientific instruments, 2011
    Co-Authors: Yunpeng Wang, Chun-liu Zhao, Juan Kang, Xinyong Dong, Shangzhong Jin
    Abstract:

    A fiber loop mirror (FLM) temperature sensor using a long-period grating (LPG) written in a photonic crystal fiber (PCF) and a band-pass filter as a demodulator is proposed. By utilizing the stable filtering function of the LPG in the PCF, the resonant wavelength variation of the FLM with temperature is transferred effectively to the intensity variation of the output light. By monitoring the light intensity of the band-pass of the filter, temperature applied on the FLM is deduced by an Optical Power Meter. Experiment results show that the temperature sensitivity is high as ~1.742 dB/ °C when a filter with a full width at half maximum 3 nm and the center at 1545 nm is used.

  • intensity measurement based temperature independent strain sensor using a highly birefringent photonic crystal fiber loop mirror
    Optics Communications, 2010
    Co-Authors: Wenwen Qian, Chun-liu Zhao, Xinyong Dong
    Abstract:

    A fiber-optic strain sensor is demonstrated by using a short length of highly birefringent photonic crystal fiber (HiBi-PCF) as the sensing element inserted in a fiber loop mirror (FLM). Due to the ultralow thermal sensitivity of the HiBi-PCF, the proposed strain sensor is inherently insensitive to temperature. When a distributed-feedback (DFB) laser passes through the FLM, the output Power is only affected by the transmission spectral change of the FLM caused by the strain applied on the HiBi-PCF. Based on intensity measurement, an Optical Power Meter is adequate to deduce the strain information and an expensive Optical spectrum analyzer (OSA) would not be needed.

  • temperature independent strain sensor based on intensity measurement using a highly birefringent photonic crystal fiber loop mirror
    Asia Communications and Photonics conference and Exhibition, 2009
    Co-Authors: Chun-liu Zhao, Xinyong Dong, Shuqin Zhang
    Abstract:

    A fiber-optic strain sensor is demonstrated by using a short length of highly birefringent photonic crystal fiber (PCF) as the sensing element inserted in a fiber loop mirror (FLM). Due to the ultralow thermal sensitivity of the PCF, the proposed strain sensor is inherently insensitive to temperature. When a DFB laser passes through the FLM, the output Power will only be affected by the transmission spectral change of the FLM caused by the strain applied on the PCF. Based on intensity measurement, an Optical Power Meter is adequate to deduce the strain information and an expensive Optical spectrum analyzer (OSA) would not be needed.