Cascaded Volume Holographic Gratings for expanding the Channel Number of a Optical Demultiplexer
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초록
캐스케이드 홀로그래픽 부피격자를 이용한 130채널 광 역다중화기를 제안하고 실험적으로 입증하였다. 첫 번째 격자와는 서로 다른 격자주기, 경사각, 중심파장 등을 갖는 두 번째 홀로그래픽 격자를 첫 번째 격자에 직렬로 부가함으로써 역다중화기의 동작파장범위를 늘릴 수 있으며, 결국 홀로그래픽 역다중화기의 채널수는 두 배 증가하게 된다. 본 논문에서는 채널 균일도가 3.5dB, 3dB 대역폭이 0.12nm, 채널누화가 -20dB인 0.4nm 채널간격을 갖는 역다중화기를 실험적으로 구현하였다.
Abstract
In this paper, the demonstration of a 130-channel optical demultiplexer based on the cascaded volume holographic gratings is presented. By serially adding the second holographic grating, which has different grating period, slant angle, and center wavelength compared to those of the first grating, the operating wavelength range of the optical demultiplexer could be expanded, and therefore, the number of channels of the holographic demultiplexer is increased by twice. As a result of the experiment, a 0.4-nm-spaced demultiplexer with the channel uniformity of 3.5 dB, the 3dB-bandwidth of 0.12 nm, and the channel crosstalk of -20 dB is experimentally achieved.
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