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Eun Joong Lee,Youngok Park,고태준,김철성 한국물리학회 2010 Current Applied Physics Vol.10 No.3
Here we describe the effect of the incident optical spot size upon the quadrant photodetector on the displacement detection sensitivity of the optical beam deflection method. By varying the size of the beam spot reaching the photodetector and measuring the optical responsivity, we have determined the optical detection sensitivity as a function of the optical spot size on the photodetector. Also, we have calculated the numerical value of the detection sensitivity with the Gaussian optical spot profile and compared with the experimental data. Both experimental and analytic studies show that the optical displacement detection sensitivity increases with the decrease in the width of the Gaussian optical spot. The study presented here will be beneficial in developing the nanomechanical displacement detection techniques based on the beam deflection method with a position-sensitive detector.
Lee, E.J.,Park, Y.,Kim, C.S.,Kouh, T. Elsevier 2010 Current Applied Physics Vol.10 No.3
Here we describe the effect of the incident optical spot size upon the quadrant photodetector on the displacement detection sensitivity of the optical beam deflection method. By varying the size of the beam spot reaching the photodetector and measuring the optical responsivity, we have determined the optical detection sensitivity as a function of the optical spot size on the photodetector. Also, we have calculated the numerical value of the detection sensitivity with the Gaussian optical spot profile and compared with the experimental data. Both experimental and analytic studies show that the optical displacement detection sensitivity increases with the decrease in the width of the Gaussian optical spot. The study presented here will be beneficial in developing the nanomechanical displacement detection techniques based on the beam deflection method with a position-sensitive detector.
4분할 광 검출기 상의 광점 크기가 변위 측정감도에 미치는 영향
이은중(Eun Joong Lee),이진우(Jin Woo Lee),고태준(Taejoon Kouh) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.2
In this paper, we have measured the effect of the optical spot size, incident upon the quadrant photodetector, on the optical displacement sensitivity of the optical beam deflection technique. We have built an optical displacement detection system based on the optical beam deflection method using 3 ㎽ He-Ne laser and measured the displacement sensitivity with changing the optical spot size on the quadrant photodetector. We have also calculated the changes in the optical displacement sensitivity as a function of the incident laser spot size by modeling a circular optical spot with constant laser intensity. Our experimental and theoretical studies show that the optical displacement sensitivity increases with the decrease in the optical spot size. This suggests that in the design of the optical motion detection systems with sub-nanometer sensitivity, the displacement sensitivity can be optimized by reducing the size of the incident optical spot on the detector.
권용환,최병석,김제하,Joong-Seon Choe,Kisoo Kim,Kwang-Seong Choi,HoGyeong Yun 한국전자통신연구원 2005 ETRI Journal Vol.27 No.5
We fabricated 40 Gb/s front-end optical receivers using spot-size converter integrated waveguide photodiodes (SSC-WGPDs). The fabricated SSC-WGPD chips showed a high responsivity of approximately 0.8 A/W and a 3 dB bandwidth of approximately 40 GHz. A selective wetetching method was first adopted to realize the required width and depth of a tapered waveguide. Two types of electrical pre-amplifier chips were used in our study. One has higher gain and the other has a broader bandwidth. The 3 dB bandwidths of the higher gain and broader bandwidth modules were about 32 and 42 GHz, respectively. Clear 40 Gb/s non-return-to-zero (NRZ) eye diagrams showed good system applicability of these modules.
Geon Jeong,김진봉,이형종,이현용,Donghoon Kim,Junseok Choi,Donghwan Lee,Mahn-Yong Park 한국전자통신연구원 2005 ETRI Journal Vol.27 No.1
This paper describes a low-loss, compact, 40-channel arrayed waveguide grating (AWG) which utilizes a monolithically integrated spot-size converter (SSC) for lowering the coupling loss between silica waveguides and standard single-mode fibers. The SSC is a simple waveguide structure that is tapered in both the vertical and horizontal directions. The vertically tapered structure was realized using a shadow-mask etching technique. By employing this technique, the fabricated, 40-channel, 100 GHz-spaced AWG with silica waveguides of 1.5% relative index-contrast showed an insertion-loss figure of 2.8 dB without degrading other optical performance.