• Title/Summary/Keyword: 공진 파장

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Effects of a Dielectric Multilayer Mirror on the Lighting Efficiency of Organic Light-Emitting Diodes Studied by Optical Simulation (유전체 다층 거울이 유기발광다이오드의 광효율 향상에 미치는 영향에 관한 광학 시뮬레이션 연구)

  • Lee, Sung-Jun;Ko, Jae-Hyeon
    • Korean Journal of Optics and Photonics
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    • v.26 no.3
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    • pp.139-146
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    • 2015
  • The effects of a dielectric multilayer mirror on the efficiency of organic light-emitting diodes (OLEDs) were investigated by using optical simulation. Adoption of a dielectric mirror consisting of alternating SiN and $SiO_2$ layers narrowed the emission spectrum due to the microcavity effect, and increased the outcoupling efficiency by a few percent. The layer thicknesses of the dielectric mirror were adjusted to change the wavelength of the resonance mode, which may be used to increase the color purity.

Analysis of the Plane-Concave Fabry-Perot cavity for a tunable filter (파장가변 필터를 위한 Plane-Concave Fabry-Perot 공진기의 해석)

  • Yeh YunHae
    • Korean Journal of Optics and Photonics
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    • v.15 no.6
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    • pp.495-502
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    • 2004
  • We proposed an analysis model for a Fabry-Perot cavity constructed with a plane-mirrored optical fiber and a concave-mirrored one. We presented the analysis results calculated by inserting practical values into the equations derived. The coupling loss of the cavity and the mirror loss are the most important parameters in reducing the insertion loss of the filter. In order to build a filter of finesse 600, FSR 57 nm, and insertion loss < 3 dB, the plane-concave cavity using mirrors of loss < 0.09% should be aligned for the coupling loss to be less than 0.1 %.

Tunable Mechanically Formed Long-Period Fiber Gratings using Periodically Arrayed Metal Wires (금속선의 주기적인 배열을 이용하여 기계적으로 형성한 파장 가변 장주기 광섬유 격자)

  • Sohn, Kyung-Rak;Kim, Kwang-Taek
    • Korean Journal of Optics and Photonics
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    • v.16 no.5
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    • pp.401-405
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    • 2005
  • In this paper, we have presented mechanically formed long-period fiber gratings using periodically arrayed brass wires with a $250-{\mu}m$ diameter and realized the function of current-controlled wavelength-tuning. With the thermo-optic effect of the surrounding medium around the fiber cladding, the continuous displacement of the resonance wavelengths is achieved through the resistant heat of the wire which changes the refractive index of surrounding material. The tunability for each mode as a function of an applied electrical power is investigated. When the glycerin is used as a thermo-optic material, the measured tuning ranges of $LP_{03}$ and $LP_{04}$ within electrical power of 20 W reach to 14 nm and 48 nm, respectively. The experimental results are in good agreement with the theoretical that which is analyzed by a geometric-optics approximation.

Multi-wavelength Conversion Scheme using Fabry-Perot Laser Diode with CFBG external cavity (CFBG 외부 공진기 구조를 갖는 Fabry-Perot 레이저를 이용한 다파장 변환기 구조)

  • 조용상;최우영
    • Proceedings of the Optical Society of Korea Conference
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    • 2001.02a
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    • pp.166-167
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    • 2001
  • 과장 변환기는 WDM (wavelength division multiplexing) 시스템에서 wavelength relocation을 가능하게 하여 시스템의 유연성과 효율성을 향상시킨다는 측면에서 매우 중요한 기능을 갖는다. WDM 시스템의 채널의 수가 점차 증가함에 따라 채널의 간격이 100 GHz에 이르고 있으며 향후 더욱 조밀해 질것이다. 이러한 DWDM (Dense WDM)시스템에서 사용될 수 있는 파장변환기는 100 GHz단위의 파장변환 기능과 광대역 가변 변위가 필수적이다. (중략)

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The Dual-Mode Ring-Resonator Bandpass Filter Using Artificial-Transmission-Lines (인공전송선로를 이용한 이중모드 링-공진기 대역통과 여파기)

  • Sim, Kyung-sub;Hwang, Hee-yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.5
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    • pp.424-429
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    • 2016
  • This paper presents dual-mode ring-resonator bandpass filter using LUC of artificial-transmission-lines. The conventional ring-resonator bandpass filter has limitation in miniaturization because the conventional ring-resonator is based on a one wavelength operation, and problem due to undesire harmonics. The ring-resonator bandpass filter is miniaturized and show higher order mode rejection by configuring a ring-resonator with LUC of artificial-transmission-lines. The two-stage bandpass filter is designed and fabricated with a ring-resonator and input/output interdigital coupled line. A fabricated filter shows dual-mode, rejection of whole ultra wide band, sharp skirt characteristics and has ring area reduced by 60 % compared to the conventional ring-resonator bandpass filter.

A Study on the Numerical Analysis of Reentrant Cavity Resonator by Mode Matching Method and Orthogonality (모드결합법과 모드직교성에 의한 요철형 공진기의 공진주파수 계산)

  • 이승무;홍의석
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.12 no.1
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    • pp.1-8
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    • 1987
  • In this paper, resonance frequencies of a reentrant cavity are computed by the mode matching method and the mode orthogonality. The reentrant cavity is composed of a coaxial cable and a cylindrical waveguide, so that resonance frequencies of the resonator can be varied by adjusting the length of the inner conductor of a coaxial cable. The result can be applied to numerous microwave devices such as klystron, wavemeter and resonant circuits of a amplifier and to the measurement of dielectric parameters.

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Wide Tuning and Modulation Characteristics Analysis of Coupled-Ring Reflector Laser Diode (결합 링 반사기 레이저 다이오드의 광대역 파장 가변 및 변조 특성 해석)

  • Yoon, Pil-Hwan;Kim, Su-Hyun;Chung, Young-Chul
    • Korean Journal of Optics and Photonics
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    • v.17 no.6
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    • pp.544-547
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    • 2006
  • A time-domain modeling approach is used to study characteristics of a widely tunable coupled-ring reflector (CRR) laser diode(LD). The CRR consists of a bus waveguide and two coupled ring resonators coupled to the bus without resorting to distributed Bragg grating structure. The tuning range can be a few tens of nanometers with a side mode suppression ratio exceeding 35dB through the adjustment of currents into the phase control sections in the rings. The CRR laser diode has long effective cavity length compared to conventional laser diodes. Accordingly, a broad additional resonance peak in the amplitude modulation characteristics is observed between 20 to 30 GHz, implying the extension of amplitude modulation bandwidth.

Miniaturization and Transmission Efficiency Improvement of Resonant Aperture Structure (공진 개구 구조의 소형화 및 투과 효율 개선)

  • Yoo, Jong-Gyeong;Yeo, Junho;Ko, Ji-Whan;Kim, Byung-Mun;Cho, Young-Ki
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.28 no.6
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    • pp.470-477
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    • 2017
  • As a method of the transmission efficiency improvement of an aperture smaller than the wavelength, we modified the conventional H-shaped resonant aperture to lower the resonance frequency of resonant aperture, and the transmission efficiency of resonant aperture was improved more than the conventional aperture. The maximum transmission cross section(TCS) calculated using the equivalent circuit tends to be almost equal to the maximum TCS from the small resonant aperture modified to improve the transmission efficiency. The transmission characteristics of resonant apertures can be quantified as the TCS, and the transmission efficiency of that can be compared. The modified resonant aperture has a maximum TCS increased by about 2.87 times from $846mm^2$ to $2,431mm^2$ compared to the H-shaped aperture, and the resonant frequency decreased from 5.06 GHz to 2.92 GHz, and the length-to-wavelength ratio of the aperture was reduced from 0.178 to 0.103.

5.2 GHz Band 2nd-order Bandpass Filter Using LTCC Multi-layer Technology (LTCC공정을 이용한 5GHz 대역 무선 LAN용 2단 적층 대역통과 여파기)

  • Song, Hee-Seok;Lee, Jae-Young;Lee, Kyu-Bok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.05c
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    • pp.273-276
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    • 2003
  • 본 논문에서는 한쪽이 단락된 스트립선로(Stripline)와 Loading 캐패시턴스(Capacitance)로 구성된 새로운 형태의 1/4파장 스트립선로 공진기를 제안하였으며, 이 공진기를 이용해서 5.2 GHz 대역 무선 LAN용 적층 대역통과 여파기를 설계, 제작 하였다. 제안한 공진기의 전파지연효과(Slow-wave Effect) 때문에, 기존의 공진기에 비해서 길이가 축소되며, 기준 공진주파수(Fundamental Resonant Frequency)에 대한, 첫 번째 기생공진주파수(First Spurious Resonant Frequency) 값이 커지기 때문에, 넓은 상향저지대역(Wide Upper Stopband)을 갖는 초소형의 대역통과 여파기의 설계가 가능하다. 설계한 여파기를 LTCC 적층 공정 기술을 이용하여 제작하였으며 그 크기는 $3.2mm{\times}1.6mm{\times}0.8mm$ 이다.

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Design of Microstrip Antenna to Tune Resonant Frequency with Voltage Control (공진 주파수 전압 제어 마이크로스트립 안테나 설계)

  • Kim, Young-Ro;Woo, Jong-Myung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.8
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    • pp.688-693
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    • 2009
  • In this paper, a half wave-length microstrip antenna was proposed to be able to continuously tune the resonant frequency in the stated area of UHF ISM band. By loading varactor diodes at both edges of the half wavelength antenna, where the electric field is the strongest, and varying the voltage in order to tune the electrical resonance length continuously, it is possible to automatically recover the resonant frequency and input impedance shifted by surrounding environment. When the microstrip antenna(center resonant frequency: 425 MHB) was tested, by adjusting the each voltages of varactor diodes from DC 0.6 to BC 3.0 volts, the resonant frequency under 20 dB return loss was varied 385 to 465 MHz. The peak gain was -0.2 dBd and return loss -10 dB bandwidth was 3.3 MHz(0.8 %).