Design of broken symmetry microlens arrays for free space optical interconnection with large alignment tolerance정렬허용도가 큰 자유공간 광 연결을 위한 비대칭 마이크로 렌즈 배열

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This thesis contains simulation result and experiment result of broken symmetry microlens array designed to increase alignment tolerance in free space optical interconnection. The simulation showed that the broken symmetry lens greatly reduces crosstalk between channels when misalignment exists between optical transmitter and receiver modules. In the simulation, we assumed an optical interconnection scheme consisting of transmitter board and receiver board. In transmitter board light source of VCSEL array is placed at the distance of focal length from microlens array and in receiver board detector array is placed at the distance of focal length from microlens array. The distance between microlenses is thus 2f, which is a confocal system. The broken symmetry lens array uses a offset lens, making the beam propagation angle different at each channel. Therefore it can reduce the crosstalk between neighboring channels when misalignment exists between transmitter board and receiver board. As a result, we identified the crosstalk is greatly reduced in the presence of misalignment, compared to the result for a symmetry lens array. The propagation of light beam in the lens system was calculated using the Gaussian beam propagation model. We considered a lens configuration with a 250$\mum$ pitch and 200$\mum$ diameter. We fabricated the microlens arrays using reflowing method. The measured focal lengths were in a range of 990$\mum$ ~1030$\mum$. We experimented one channel of broken symmetry, with power efficiency and crosstalk, because of delay of flip-chip bonding. After measurement, power passing through the first lens is 470$\muw$, and through second lens is 220, when measured input power is 630$\muw$. Power efficiency is calculated as the ratio of power passing through the second lens to input power when using offset lens of 10$\mum$. We obtained 34% of power efficiency through calculation. In this thesis, we gave demonstrated the broken symmetry lens array...
Advisors
Park, Hyo-Hoonresearcher박효훈researcher
Description
한국정보통신대학원대학교 : 공학부,
Publisher
한국정보통신대학원대학교
Issue Date
2000
Identifier
392005/225023 / 000983886
Language
eng
Description

학위논문(석사) - 한국정보통신대학원대학교 : 공학부, 2000, [ xi, 50 p. ]

Keywords

Burst-Mode; 2.5Gb/s Optical Transmitter; 2.5Gb/s 광송신기; 버스트 모드; ATM-PON

URI
http://hdl.handle.net/10203/54685
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=392005&flag=dissertation
Appears in Collection
School of Engineering-Theses_Master(공학부 석사논문)
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