• Title/Summary/Keyword: Optical resonator

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All-Fiber Microwave Signal Processing Device with Z-Shaped Double Coupler Optical Resonator (Z형 쌍-결합기 광 공진기를 이용한 광섬유 마이크로파 신호처리)

  • 이동욱
    • Proceedings of the Optical Society of Korea Conference
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    • pp.116-117
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    • 1999
  • Optical fiber networks for microwave signal processing have been investigation . Theoretical and experimental results are presented in Z-shaped Double-Coupler Optical Resonator. The use of Mason's rule to calculate transfer functions greatly simplified the analysis in our model. A good comparison between modelling and experiment is presented.

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Shannon Entropy as an Indicator of the Spatial Resolutions of the Morphologies of the Mode Patterns in an Optical Resonator

  • Park, Kyu-Won;Kim, Jinuk;Moon, Songky
    • Current Optics and Photonics
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    • v.5 no.1
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    • pp.16-22
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    • 2021
  • We present the Shannon entropy as an indicator of the spatial resolutions of the morphologies of the resonance mode patterns in an optical resonator. We obtain each optimized number of mesh points, one of minimum size and the other of maximum one. The optimized mesh-point number of minimum size is determined by the identifiable quantum number through a chi-squared test, whereas the saturation of the difference between Shannon entropies corresponds to the other mesh-point number of maximum size. We also show that the optimized minimum mesh-point increases as the (real) wave number increases and approximates the proportionality constant between them.

Optical Resonance-based Three Dimensional Sensing Device and its Signal Processing (광공진 현상을 이용한 입체 영상센서 및 신호처리 기법)

  • Park, Yong-Hwa;You, Jang-Woo;Park, Chang-Young;Yoon, Heesun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.763-764
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    • 2013
  • A three-dimensional image capturing device and its signal processing algorithm and apparatus are presented. Three dimensional information is one of emerging differentiators that provides consumers with more realistic and immersive experiences in user interface, game, 3D-virtual reality, and 3D display. It has the depth information of a scene together with conventional color image so that full-information of real life that human eyes experience can be captured, recorded and reproduced. 20 Mega-Hertz-switching high speed image shutter device for 3D image capturing and its application to system prototype are presented[1,2]. For 3D image capturing, the system utilizes Time-of-Flight (TOF) principle by means of 20MHz high-speed micro-optical image modulator, so called 'optical resonator'. The high speed image modulation is obtained using the electro-optic operation of the multi-layer stacked structure having diffractive mirrors and optical resonance cavity which maximizes the magnitude of optical modulation[3,4]. The optical resonator is specially designed and fabricated realizing low resistance-capacitance cell structures having small RC-time constant. The optical shutter is positioned in front of a standard high resolution CMOS image sensor and modulates the IR image reflected from the object to capture a depth image (Figure 1). Suggested novel optical resonator enables capturing of a full HD depth image with depth accuracy of mm-scale, which is the largest depth image resolution among the-state-of-the-arts, which have been limited up to VGA. The 3D camera prototype realizes color/depth concurrent sensing optical architecture to capture 14Mp color and full HD depth images, simultaneously (Figure 2,3). The resulting high definition color/depth image and its capturing device have crucial impact on 3D business eco-system in IT industry especially as 3D image sensing means in the fields of 3D camera, gesture recognition, user interface, and 3D display. This paper presents MEMS-based optical resonator design, fabrication, 3D camera system prototype and signal processing algorithms.

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Four-channel Selective Photonic Microwave Filter Based on Optical Resonator Router (폴리머 광공진기 라우터 기반의 4채널 선택 포토닉 마이크로웨이브 대역통과 필터)

  • Kim, Gun-Duk;Eo, Yun-Sung;Lee, Sang-Shin
    • Korean Journal of Optics and Photonics
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    • v.19 no.3
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    • pp.242-245
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    • 2008
  • A four-channel selective microwave filter was demonstrated incorporating an optical resonator router, which is constructed by integrating a $1{\times}4$ space switch with an arrayed ring filters featuring different free spectral ranges. The center frequency of each channel was determined by the FSR of the corresponding ring resonator, and the four channels centered at 10 GHz, 16 GHz, 18 GHz and 20 GHz were individually selected to provide a bandpass filtering via the control voltage applied to the switched resonator.

A Study on the Orthogonality Properties of the Eigenmodes of Phase Conjugate Optical Resonator (위상 공액 공진기의 고유 모드 직교성에 관한 연구)

  • 趙濟煌;金恩洙;楊仁應
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.23 no.3
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    • pp.397-400
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    • 1986
  • In this paper, the orthogonal properties of the eigenmodes of optical resonators which have phase conjugate mirrors at both ends are derived. The modes which propagate in resonators are descdribed by the Huygens integral. Then, the eigeneuqation which is needed in order to prove the orthogonality of the eigenmodes of the resonator is obtained from this representation. When the kernel being a part of the eigenequation is Hermitian as in conventional resonators and in optical resonator with only one phase conjugate mirror, one can show that the eigenmodes have essentially biorthogonal relations, which are satisfied the set of modes propagating in one direcdtion around the resonator and the adjoint set of modes propagating in the reversed direction.

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Laser Phase Noise to Electronic Phase Noise Conversion in Optical Links Comprising Optical Resonators

  • Wang, Ziye;Yang, Chun;Xu, Weijie
    • Current Optics and Photonics
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    • v.2 no.5
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    • pp.395-399
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    • 2018
  • This article investigates the mechanism of electronic signal phase noise degradation induced by laser phase noise in optical links comprising optical resonators. Through theoretical derivation, we find that the phase noise of the output electronic signal has the same spectral shape of optical intensity noise as the output of the optical resonator. We propose that the optical resonator transfers laser phase noise to light intensity fluctuation and then the intensity fluctuation is converted to electric phase noise through AM-PM conversion mechanism in the photodiode. An optical link comprising a Fabry-Perot resonator was constructed to verify the proposed mechanism. The experimental results agree with our theoretical prediction verifying that the supposition is correct.

Strained Ge Light Emitter with Ge on Dual Insulators for Improved Thermal Conduction and Optical Insulation

  • Kim, Youngmin;Petykiewicz, Jan;Gupta, Shashank;Vuckovic, Jelena;Saraswat, Krishna C.;Nam, Donguk
    • IEIE Transactions on Smart Processing and Computing
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    • v.4 no.5
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    • pp.318-323
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    • 2015
  • We present a new way to create a thermally stable, highly strained germanium (Ge) optical resonator using a novel Ge-on-dual-insulators substrate. Instead of using a conventional way to undercut the oxide layer of a Ge-on-single-insulator substrate for inducing tensile strain in germanium, we use thin aluminum oxide as a sacrificial layer. By eliminating the air gap underneath the active germanium layer, we achieve an optically insulating, thermally conductive, and highly strained Ge resonator structure that is critical for a practical germanium laser. Using Raman spectroscopy and photoluminescence experiments, we prove that the novel geometry of our Ge resonator structure provides a significant improvement in thermal stability while maintaining good optical confinement.

Polymeric Ring Resonator with Variable Extinction Ratio (소멸비가 가변되는 폴리머 링 레조네이터)

  • Song, Ju-Han;Kim, Do-Hwan;Lee, Sang-Shin
    • Korean Journal of Optics and Photonics
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    • v.17 no.4
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    • pp.342-346
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    • 2006
  • A polymeric ring resonator with electrically variable extinction ratio at resonant wavelengths has been proposed and demonstrated. It consists of a ring waveguide coupled to a straight bus waveguide and a modulating electrode, which is formed in the outer cladding region outside of the ring. When electrical power is applied to the electrode, the refractive index of the polymers underneath the electrode is lowered to strengthen the confinement of the guided mode of the ring and thus the equivalent effective refractive index felt by the mode is decreased. Therefore, the propagation loss of the guided mode is reduced with the applied electrical power Consequently the extinction ratio at resonant wavelengths is varied by the electrical power. For the achieved results, the extinction ratio was changed by about 9 dB for the electrical power of 12 mW, when the propagation loss of the ring was reduced by 80 dB/cm.