OPTICAL DEMULTIPLEXER

• Main Authors: MIYATA TAKANORI, KAMITOONO HIROTAKA, HIRAI YOSHIHISA, SUZUKI JUNICHI
• Format: Patent
• Language: English; Japanese
• Published: 01.02.2018
• Subjects: MEASURING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

PROBLEM TO BE SOLVED: To prevent a signal light from entering the side face of a multiple reflection unit.SOLUTION: The present disclosure is an optical demultiplexer that splits, for each signal wavelength, a signal light B21 in which a plurality of wavelengths are multiplexed, and comprises: a reflection prevention film 12 arranged on an incidence plane 111 of a glass block 11; filters 21-24 arranged on an emission plane 112 of the glass block 11, for allowing a light of a wavelength determined for each signal wavelength out of the signal light B21 to pass through and reflecting lights of other wavelengths than the transmitted wavelength toward the incidence plane 111; and a reflection film 13 arranged on the incidence plane 111 of the glass block 11. On an optical path of a reflected light B29 that is reflected by the filter 24 arranged at a far end from the reflection prevention film 12, there is applied a treatment for reducing the reflection of the reflected light B29 to the inside of the glass block 11.SELECTED DRAWING: Figure 5 【課題】本開示は、信号光の多重反射部の側面への入射を未然に防ぐことを目的とする。【解決手段】本開示は、複数の波長が波長多重されている信号光Ｂ２１を信号波長ごとに分波する光分波器であって、ガラスブロック１１の入射面１１１に配置されている反射防止膜１２と、ガラスブロック１１の出射面１１２に配置され、信号光Ｂ２１のうちの信号波長ごとに定められた波長の光を透過し、透過波長以外の波長の光を入射面１１１に向けて反射するフィルタ２１〜２４と、ガラスブロック１１の入射面１１１に配置されている反射膜１３と、を備え、反射防止膜１２に対して遠端に配置されているフィルタ２４で反射された反射光Ｂ２９の光路上に、反射光Ｂ２９のガラスブロック１１内への反射を減少させる処理が施されている光分波器である。【選択図】図５