Multiplexing/demultiplexing unit and multiplexer/ demultiplexer for coherent light communication

Abstract

Abstract PURPOSE:To synthesize or separate signal light rays multiplexed at narrow inter-wavelength intervals at a low loss by using a Fabry-Perot interferometer. CONSTITUTION:The wavelength multiplexed light of wavelengths lambda1-lambdan passes a splitter 11 and is polarized to circularly polarized light by a quarter wave plate 12 when this light is entered as a P wave to a polarized beam splitter 11. Of these wavelengths lambda1-lambdan, the light of, for example, the wavelength lambda1, passes the Fabry-Perot interferometer 13. The light of the other wavelengths is reflected by the interferometer 13. The light except the wavelength lambda1 is reflected by the interferometer 13 and is made by the wave plate 12 into an S wave which is reflected by the splitter 11, is separated from the incident direction and is emitted as the S wave. The light of lambda2-lambdan incident in the reflection optical axis direction of the splitter 11 as the S wave is reflected by the splitter 11 and is polarized by the wave plate 12 to the circularly polarized light. This light is reflected by the interferometer 13, is converted to the P wave by the wave plate 12 and is emitted through the splitter 11. The light of the wavelength lambda1 is synthesized with the light of lambda2-lambdan and is emitted.

Inventors

• 👤 Terumi Chikama
• 👤 Tetsuya Kiyonaga
• 👤 Yoshito Onoda
• 👤 Hideo Kuwabara

Bibliographic Details