Holographic Optical Elements for Optical Interconnections and Wavelength-Division-Multipexing of Optical Fiber Communications

• Main Authors: Yi-Kong Tsai, 蔡宜恭
• Other Authors: Prof. Der-Chin Su
• Format: Others
• Language: en_US
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/08720713605396592344

博士 === 國立交通大學 === 光電(科學)研究所 === 82 === The performance of optical interconnections and wavelength- division-multiplexing (WDM) device is limited by signal transmission fanout densities and capacity. Holographic optical elements have good characteristics for free-space optical interconnections and WDM, including high diffraction efficiency, combined several optical functions and ease of fabrication to solve these problem. In this dissertation, the large fanout optical interconnection elements that utilize the diffraction from volume hologams, and the symmetrical off-axis and substrate-mode structure have been described. Techniques for making tunable focal power elements and beam compression connectors are disscused and experimentally fabricated in bleach silver halide and dichromated gelatin emulsions. These devices should lead to more efficient optical interconnection architecture that would be more suitable for optical implementation. WDM involves the transmission of a number of different peak wavelength optical signals in pacallel ot a single optical fiber. Bragg diffraction, angular dispersion and total internal reflection propagation by substrate-mode holograms have been used to demonstrate a large channels of WDM device. The major implementations of wavelength-division- multiplexing /demultiplexing devices with transmission- and reflection-type substrate-mode grating pairs are discussed and compared with particular emphasis placed on their optical efficiency, crosstalk performance and the number of channels that may be provided. We have desiged and fabricated WDM devices that are implemented by polarization-insensitive high- efficiency substrate-mode hologram. Based on the above schemes, multi-channel devices, which exhibits low insertion loss and crosstalk attenuation, has been demonstrated. In addition, the design of WDM using the cascaded structure of substrate-mode holograms is also presented. The design can increase the transmission capacity more efficiently.