The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Sarun Sumriddetchkajorn - One of the best experts on this subject based on the ideXlab platform.
-
Moderate-to-high optical-isolation reconfigurable 1×2 fiber-optic add-drop switches using a dense wavelength division multiplexing Thin-Film Filter
Applied optics, 2006Co-Authors: Sarun Sumriddetchkajorn, Kosom ChaitavonAbstract:We propose and experimentally demonstrate Thin-Film Filter- (TF) based reconfigurable 1 x 2 fiber-optic add-drop switch (FADS) structures. Our key idea is to locate a movable mirror oriented at a desired angle near the TF to switch the desired wavelength optical beams to the wanted switching ports. Our first moderate-optical-isolation TF-based reconfigurable 1 x 2 FADS is in a transmissive design. Another TF-based reconfigurable 1 x 2 FADS structure is in a retroreflective configuration, and it gives a very low optical-coherent cross talk. Our experimental proof of concept using an off-the-shelf four-cavity TF measured center wavelength at 1,545.749 nm and a 0.8 mm x 0.8 mm x 0.15 mm movable mirror confirms a -19 dB and a much improved
-
High-dynamic-range high-optical-isolation wavelength-sensitive Thin Film Filter-based variable fiber optic attenuator
Optical Engineering, 2006Co-Authors: Sarun Sumriddetchkajorn, Kosom ChaitavonAbstract:A wavelength-sensitive variable fiber optic attenuator (VFOA) is introduced by incorporating the movable optical mirror with a fixed desired Thin Film Filter (TF) in a compact in-line reflective architecture. Our TF-based wavelength-sensitive VFOA features low component count, high attenuation dynamic range, and high optical isolation. Experimental proof of concept using an off-the-shelf measured 1545.71-nm TF and a mechanically movable mirror shows a 4.64-dB optical loss, and a low polarization-dependent loss of 0.12 dB at the output port. A high optical attenuation dynamic range of >43 dB with a better than 30-dB optical isolation is obtained. Several proposed reflective wavelength-sensitive TF-based VFOAs can also be cascaded to form a low-cost, compact, multiwavelength amplitude controller.
-
A Thin-Film Filter-based 1/spl times/2 reconfigurable fiber-optic add-drop module with a quadruple fiber-optic collimator
IEEE Photonics Technology Letters, 2006Co-Authors: Sarun Sumriddetchkajorn, K. ChaitavonAbstract:Due to a limited optical crosstalk in most Thin-Film Filter (TF)-based fiber-optic modules, we propose and experimentally verify a low optical crosstalk TF-based 1/spl times/2 reconfigurable fiber-optic add-drop structure. Our key idea is to employ a passive noise rejection scheme by introducing a double reflection on the TF as well as a spatial separation through a combination of a quadruple and a single fiber-optic collimators. Our experimental results show a much improved
-
Wavelength-sensitive Thin-Film Filter-based variable fiber-optic attenuator with an embedded monitoring port
IEEE Photonics Technology Letters, 2004Co-Authors: Sarun Sumriddetchkajorn, K. ChaitavonAbstract:A wavelength-sensitive three-port variable fiber-optic attenuator (VFOA) is introduced by incorporating the movable optical mirror with a fixed desired Thin-Film Filter (TF). Experimental proof of concept using an off-the-shelf measured 1545.60-nm TF and a mechanically movable mirror shows a low 0.47-dB optical loss, a low polarization-dependent loss of 0.6 dB at maximum optical attenuation setting, and a 15.9-dB dynamic range measured at the output port. Several proposed wavelength-sensitive three-port VFOAs can also be cascaded to form a low cost compact multiwavelength amplitude controller.
-
A reconfigurable Thin-Film Filter-based 2 x 2 add-drop fiber-optic switch structure
IEEE Photonics Technology Letters, 2003Co-Authors: Sarun Sumriddetchkajorn, Kosom ChaitavonAbstract:A reconfigurable 2 /spl times/ 2 add-drop fiber-optic switch structure is proposed by incorporating the independent mechanical control and alignment of an off-the-shelf Thin-Film Filter with a reflective optical element. Cascading several 2 /spl times/ 2 add-drop switches gives a low-cost polarization-independent wavelength routing system with the limitation in optical loss that can be compensated by using optical amplifiers. The experimental result indicates a measured average optical loss of
K. Chaitavon - One of the best experts on this subject based on the ideXlab platform.
-
A Thin-Film Filter-based 1/spl times/2 reconfigurable fiber-optic add-drop module with a quadruple fiber-optic collimator
IEEE Photonics Technology Letters, 2006Co-Authors: Sarun Sumriddetchkajorn, K. ChaitavonAbstract:Due to a limited optical crosstalk in most Thin-Film Filter (TF)-based fiber-optic modules, we propose and experimentally verify a low optical crosstalk TF-based 1/spl times/2 reconfigurable fiber-optic add-drop structure. Our key idea is to employ a passive noise rejection scheme by introducing a double reflection on the TF as well as a spatial separation through a combination of a quadruple and a single fiber-optic collimators. Our experimental results show a much improved
-
Wavelength-sensitive Thin-Film Filter-based variable fiber-optic attenuator with an embedded monitoring port
IEEE Photonics Technology Letters, 2004Co-Authors: Sarun Sumriddetchkajorn, K. ChaitavonAbstract:A wavelength-sensitive three-port variable fiber-optic attenuator (VFOA) is introduced by incorporating the movable optical mirror with a fixed desired Thin-Film Filter (TF). Experimental proof of concept using an off-the-shelf measured 1545.60-nm TF and a mechanically movable mirror shows a low 0.47-dB optical loss, a low polarization-dependent loss of 0.6 dB at maximum optical attenuation setting, and a 15.9-dB dynamic range measured at the output port. Several proposed wavelength-sensitive three-port VFOAs can also be cascaded to form a low cost compact multiwavelength amplitude controller.
-
A compact wavelength selective 2 /spl times/ 2 fiber-optic switch
CLEO Pacific Rim 2003. The 5th Pacific Rim Conference on Lasers and Electro-Optics (IEEE Cat. No.03TH8671), 1Co-Authors: Sarun Sumriddetchkajorn, K. ChaitavonAbstract:A programmable wavelength selective 2 /spl times/ 2 fiber-optic switch structure is proposed by incorporating the independent control and alignment of the off-the-shelf Thin Film Filter with the reflective optical element. Optical loss of < 1.30 dB and a low polarization dependent loss of < 0.07 dB are measured.
H. Zimer - One of the best experts on this subject based on the ideXlab platform.
-
Thin-Film Filter wavelength-stabilized, grating combined, high-brightness kW-class direct diode laser
Optics express, 2017Co-Authors: M. Haas, S. Nagel, Simon Rauch, Lukas Irmler, Thomas Dekorsy, H. ZimerAbstract:We report on kW-class dense wavelength beam combining of a laser diode module consisting of ten broad-area laser diode bars by using a novel multi-laser cavity approach based on a Thin-Film Filter (TFF) as a dispersive optical element. The wavelength-stabilized output of the TFF cavity is beam combined upon a −1st order transmission grating. Hereby, a cylindrical telescope is used for linear dispersion-matching between the TFF and the combiner grating. On the basis of simulations of the resulting beam quality deterioration, we are able to optimize the cavity and the combiner setup for optimal beam quality preservation. We demonstrate a highly efficient direct diode laser with 1.1-kW output power and a symmetrical beam parameter product of about 6mm × mrad (95 % power content) in both beam axis.
-
Dense wavelength beam combining of an external Thin-Film Filter multi-laser cavity stabilized diode laser module
Conference on Lasers and Electro-Optics, 2016Co-Authors: M. Haas, S. Nagel, Simon Rauch, Alexander Killi, H. ZimerAbstract:We report on kW-class dense wavelength beam combining of a diode laser module which is spectrally stabilized using a novel external multi-laser cavity architecture based on a Thin-Film Filter as a dispersive optical element.
-
Thin-Film Filter, wavelength-locked, multi-laser cavity for dense wavelength beam combining of broad-area laser diode bars.
Optics letters, 2015Co-Authors: M. Haas, Alexander Killi, C. Tillkorn, S. Ried, M. Ginter, H. ZimerAbstract:We report on individual wavelength locking of a multiplet of 100-μm broad-area laser diode emitters arranged on a 50% fill-factor bar by means of a single external multi-laser cavity using an ultra-narrowband Thin-Film Filter as a dispersive optical element. The achieved wavelength-locked output power is 216 W, corresponding to an electrical-to-optical conversion efficiency of about 49.7%. The 45 emitters of the laser diode bar are stabilized wiThin a spectral range of about 6.4 nm. Our approach is suited for killowatt-class dense wavelength beam combining of direct diode lasers.
Kefa Cen - One of the best experts on this subject based on the ideXlab platform.
-
investigation of a broadband tio2 sio2 optical Thin Film Filter for hybrid solar power systems
Applied Energy, 2012Co-Authors: Chunhui Shou, Zhongyang Luo, Tao Wang, Weidong Shen, Gary Rosengarten, Wei Wei, Cheng Wang, Kefa CenAbstract:Abstract Using the technology of spectral selectivity to integrate different solar power generators in a hybrid system is a feasible way to improve the optical-electric efficiency. This paper presents an 82-layer broadband optical interference Thin-Film Filter matching with crystalline silicon photovoltaic cells, which using TiO2 and SiO2 as fabrication materials and can be used in hybrid solar power systems like photovoltaic–thermoelectric generator (PV–TEG) systems. The design, optimization and fabrication process of the Filter is described, high reflectance from 400 nm to 1100 nm as well as high transmittance from 1100 nm to 2500 nm over the broadband of solar spectrum are obtained. The classical electron beam evaporation plant is used to fabricate the Filter. Four different incidence angles’ optical performances of the sample Filter are measured which agree well with the numerical simulation results. The electrical characteristics of a typical Silicon photovoltaic cell using the fabricated sample Filter are measured. An average efficiency increase of 3.24% for the solar cell with respect to the solar energy it receives can be obtained due to the Filter. A calculation model for a hybrid PV–TEG system using this Thin-Film Filter is proposed and the benefits of the Filter for hybrid solar power systems are demonstrated.
-
Investigation of a broadband TiO2/SiO2 optical Thin-Film Filter for hybrid solar power systems
Applied Energy, 2012Co-Authors: Chunhui Shou, Zhongyang Luo, Tao Wang, Weidong Shen, Gary Rosengarten, Wei Wei, Cheng Wang, Kefa CenAbstract:Abstract Using the technology of spectral selectivity to integrate different solar power generators in a hybrid system is a feasible way to improve the optical-electric efficiency. This paper presents an 82-layer broadband optical interference Thin-Film Filter matching with crystalline silicon photovoltaic cells, which using TiO2 and SiO2 as fabrication materials and can be used in hybrid solar power systems like photovoltaic–thermoelectric generator (PV–TEG) systems. The design, optimization and fabrication process of the Filter is described, high reflectance from 400 nm to 1100 nm as well as high transmittance from 1100 nm to 2500 nm over the broadband of solar spectrum are obtained. The classical electron beam evaporation plant is used to fabricate the Filter. Four different incidence angles’ optical performances of the sample Filter are measured which agree well with the numerical simulation results. The electrical characteristics of a typical Silicon photovoltaic cell using the fabricated sample Filter are measured. An average efficiency increase of 3.24% for the solar cell with respect to the solar energy it receives can be obtained due to the Filter. A calculation model for a hybrid PV–TEG system using this Thin-Film Filter is proposed and the benefits of the Filter for hybrid solar power systems are demonstrated.
Suntae Jung - One of the best experts on this subject based on the ideXlab platform.
-
Thin Film Filter embedded triplexing Filters based on directional couplers for ftth networks
IEEE Photonics Technology Letters, 2005Co-Authors: Jeong Hwan Song, Kyoungyoum Kim, Jaegeol Cho, Dongkyoon Han, Joohoon Lee, Yu Sheop Lee, Suntae Jung, Donghoon Jang, Kyung Shik LeeAbstract:We designed and experimentally demonstrated a Thin Film Filter (TFF)-embedded directional coupler-type triplexing-Filter on the planar-lightwave-circuit platform. The triple-play multiplexing was significantly simplified by using one TFF. The 1.31- and 1.55-/spl mu/m lights were designed to be divided after passing the directional coupler by half-cycle and full-cycle coupling actions, respectively. The 1.49-/spl mu/m light was reflected by a TFF inserted in a trench on the directional coupler. The insertion losses of fabricated triplexing-Filters were less than 2.0 dB with bandwidths of 20 nm. The newly proposed triplexing-Filter provides a cost-effective high-performance solution for fiber-to-the-home networks.
-
Reduction of insertion loss of Thin Film Filters embedded in PLC platforms
IEEE Photonics Technology Letters, 2005Co-Authors: Kyoungyoum Kim, Jeong Hwan Song, Jaegeol Cho, Dongkyoon Han, Joohoon Lee, Yu Sheop Lee, Yoon Kim, Suntae JungAbstract:We propose and experimentally demonstrate a method of reducing insertion loss of a Thin-Film-Filter-embedded planar-lightwave-circuit platform for a triplexer transceiver module. Significant loss reduction was achieved by adding horn waveguide elements at the interfaces between the Thin Film Filter and the output-port (transmission and reflection) waveguides.