Optical multiplexer/demultiplexer

Abstract

Abstract PURPOSE:To contrive the realization of an optical multiplexer/demultiplexer which is miniature and has no loss theoretically without using working parts of a high level, by executing optical multiplexing or demultiplexing so that polarized light directions of light beams whose wavelength is different are intersected orthogonally with each other by using a polarized light rotary element having prescribed thickness. CONSTITUTION:When the polarized light direction of a light beam of wavelength lambda1 is rotated by theta1 by a polarized light rotary element 4, and the polarized light direction of a light beam of wavelength lambda2 is rotated by theta2, in the case of theta1-theta2=+ or -pi/2, the polarized light directions of the light beams of wavelengths lambda1, lambda2 which have passed linearly through a polarized light beam splitter 3-1 are intersected orthogonally to each other. Also, the polarized light directions of the light beams of wavelengths lambda1, lambda2 whose optical paths have been bent by the polarized light beam splitter 3-1 are intersected orthogonally with each other. In such a polarized light state, the light beam which has passed through the polarized light rotary element 4 and has passed through the polarized light beam splitter 3-1 is made incident on a polarized light beam splitter 3-2 as it is, and the light beam which has been reflected by the polarized light beam splitter 3-1 is reflected by a rectangular prism 5-2 and a mirror 6, thereafter, made incident on the polarized light beam splitter 3-2. In such a way, demultiplexing of a wavelength multiple light is attained.

Inventors

• 👤 Yoji Fujii
• 👤 藤井　洋二
• 👤 Junichiro Minowa
• 👤 箕輪　純一郎

Bibliographic Details