• Title, Summary, Keyword: Thermo-optic effect

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Fiber-Optic Temperature Sensor Based on Single Mode Fused Fiber Coupler

  • Kim, Kwang-Taek;Park, Kiu-Ha
    • Journal of the Optical Society of Korea
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    • v.12 no.3
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    • pp.152-156
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    • 2008
  • This paper reports a fiber-optic temperature sensor using a single mode fused fiber coupler incorporating a thermo-optic external medium. The spectral transmission was altered by changing the refractive index of the external thermo-optic medium. A theoretical and experimental investigation was carried out with the aim of achieving high sensitivity. The measured sensitivity for the environmental temperature was as high as -1.5 $nm/^{\circ}C$.

Thermo-Optic Tunable Filter and Packaging for Micro-Optical Bench (열광학 효과를 이용한 파장 가변 필터와 미세광학벤치를 이용한 패키징)

  • 박헌용;황병철;이승걸;오범환;이일항;박세근
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.203-206
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    • 2003
  • Thermo-optic tunable filter, with 4-pairs of H/L layers for DBR, was designed and fabricated. The transmittance characteristics of the filter were measured. Additionally, heating system and temperature sensor system were used in order to observe property of the filter by thermo-optic effect. The tuning efficiency of the filter was measured to be 0.144nm/K$^{-1}$ showing the tuning range of 9.4nm for the temperature variation of 64.7$^{\circ}C$. Filter, lens and fiber were aligned by micro-optical bench.

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Development of Trenched SOI 1X2 Thermo-Optic Switch for Improvement of Thermal Diffusion Effect (열확산 효과 개선을 위한 트렌치 구조의 SOI 1X2 열광학 스위치 개발)

  • 박종대;서동수;이기수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.12S
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    • pp.1255-1260
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    • 2003
  • In order to reduce driving power consumption, we propose and fabricate a new structure of asymmetric SOI 1${\times}$2 thermo-optic switch that has a back side silicon trenched structure. Compared to conventional SOI thermo optic switches without heat sink structure, it shows an improvement of switching power reduction from about 4 watt to 1.8 watt without sacrificing cross talk of about 20 ㏈ at the light wavelength of 1.55 $\mu\textrm{m}$. Here we also described the main design consideration and fabrication procedure for the proposed device.

A Study on the Analysis of $1{\times}2$ Polymer Waveguide Thermo-optic switch ($1{\times}2$ 열광학 폴리머 광스위치의 해석에 관한 연구)

  • 곽혁용;김종헌
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.247-251
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    • 1998
  • This work presents the analysis of $1\times2$ polymer waveguide thermo-optic switch using asymmetric Y-splitter at the wavelength of 1300nm. Because of the high thermo-optic coefficient of polymeric materials the design of efficient switches were feasible. For the numerical simulation of these switches the finite difference beam propagation method has been employed. Design rules for a $1\times2$ polymeric switch have been defined by using the numerical techniques.

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Thermo-optic Effects of Optical Temperature Sensor (광 온도센서의 열전.광 효과)

  • Lee, Kwang-Seok;Kim, Hyun-Deok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.11
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    • pp.2049-2054
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    • 2006
  • This paper demonstrates a comparison of linear and nonlinear analyses for thermo-optic effects of optical temperature sensor based on the etched silica-based planar waveguide Bragg grating. Topics include theoretical analyses and experiment of the etched planar waveguide Bragg grating optical temperature sensor, Theoretical models with nonlinear than linear temperature effect for the grating response based on waveguide and plate deformation theories agree with experiments to within acceptable tolerance.

Highly sensitive temperature sensor based on etched fiber with thermally expanded core (식각된 열확산 코어 광섬유를 이용한 고감도 온도 센서)

  • Kim, Kwang-Taek;Song, Hyun-Suk;Shin, Eun-Soo;Hong, Ki-Bum
    • Journal of Sensor Science and Technology
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    • v.15 no.4
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    • pp.263-268
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    • 2006
  • We have demonstrated a highly sensitive temperature sensor using an etched single mode fiber with a thermally expanded core region. Large core size of thermally expanded core facilitates access to evanescent wave by the wet etching. The etched region was surrounded by a low dispersive external medium with high thermo-optic coefficient. Due to the large difference between the dispersion property of the fiber and that of the external medium, the device reveals a cut-off properties at spectral region. The cut-off wavelength was shifted by the variations of the environmental temperatures because of thermo-optic effect of the external medium. The sensitivity of the fabricated device was found to be $45nm/^{\circ}C$.

Polarization-independent temperature sensor using cladding layers of the overlay waveguide coupled with a side-polished fiber (측면 연마 광섬유와 결합된 상부 도파로의 클래딩을 이용한 편광 무의존 온도센서)

  • 손경락;김광택;송재원
    • Korean Journal of Optics and Photonics
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    • v.13 no.6
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    • pp.467-472
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    • 2002
  • In this paper, we propose a polarization-insensitive temperature sensor using a thermo-optic effect of the upper and (or) lower cladding of a planar waveguide in contact with a side-polished fiber. A microscope cover glass with thickness of a 170 ${\mu}{\textrm}{m}$ is adopted as an overlay waveguide because this waveguide opposes sudden temperature change and ensures polarization-insensitive responses. The measured polarization-dependence loss is less than 0.3 dB. The temperature can be detected as a result of the shift in coupling wavelength of the sensor. We investigate the shift in coupling wavelength as a function of the temperature variation with respect to the different thermo-optic coefficients of lower and upper claddings. We also show that the temperature sensitivity of the device can be easily controlled by the thermo-optic coefficients of lower and upper claddings of the overlay waveguide.

Thermo-optic Effects of Bragg Grating Optical Temperature Sensor

  • Ahn, Kook-Chan;Lee, Sang-Mae;Lee, Gwang-Seok;Park, Seung-Bum
    • International Journal of Aeronautical and Space Sciences
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    • v.3 no.2
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    • pp.24-30
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    • 2002
  • This paper demonstrates a comparison of linear and nonlinear analyses for thermo-optic effects of optical temperature sensor based on the etched silica-based planar waveguide Bragg grating. Topics include theoretical analyses and experiment of the etched planar waveguide Bragg grating optical temperature sensor. Theoretical models with nonlinear than linear temperature effect for the grating response based on waveguide and plate deformation theories agree with experiments to within acceptable tolerance.

Active optical coupler using the side polished single mode fiber and thermo-optic polymer multimode planar waveguide (측면 연마된 단일모드 광섬유와 열 광학 다중모드 평면도파로를 이용한 능동형 광 결합기)

  • 김광택;유호종;김성국;이소영;송재원;이상재;김시홍;강신원
    • Korean Journal of Optics and Photonics
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    • v.10 no.3
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    • pp.248-253
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    • 1999
  • In this paper, we have investigated a fiber type active coupler which utilizes the mode coupling between the side polished single mode optical fiber and the active multimode planar waveguide. The proposed device can be used for not only tunable wavelength filter or optical intensity modulator but also a tool for measuring optical properties of guiding material such as refractive index, birefringence, electro-optic coefficient, and thermo-optic coefficient. We gave designed and optimized a coupler structure using the BPM and fabricated the device using thermo-optic polymer as active planar waveguide overlay. The device showed that insertion loss was less then 0.5 dB, extinction ratio was -13 dB at the resonance wavelength, and the wavelength tunablity due to thermo-optic effect was -1.5 nm/$^{\circ}C$. The active coupler using thermo-optic effect can be used as a wavelength tunable filer, an optical intensity modulator and an optical sensor. pulses that are subsequently compressed by a dispersive optical fiber. Experimental results show that $sech^2$ shape pulses with a pulse width of ~14 ps and a time bandwidth product of ~0.34 are successfully generated at 10 GHz repetition rate. In contrast to other methods, such as higher order soliton compression, this approach does not depend on the optical power and thus shows promise for application to low-power lasers.

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