Optical demultiplexer

Abstract

Abstract PURPOSE:To obtain an optical demultiplexer which has wide passing wavelength band width by allowing diffracted light from a diffraction grating to travel backward through a corner cube, and making it incident to the diffraction grating again. CONSTITUTION:An incident light beam from an incidence fiber 13 is converted by a distributed index rod lens 14 into parallel luminous flux, which strikes the diffraction grating 16 installed at a specific angle through a glass block 15. The diffracted light within a wavelength range lambda-lambda2 converges on the reflective surface of a corner cube 17-a and then guided as backward traveling divergent light to the diffraction grating 16 again. The parallel luminous flux diffracted again by the diffraction grating 16 passes through the distributed index type rod lens 14 to converge on the end surface of a projection fiber 18-a. Similarly, diffracted light within a wavelength range lambda3-lambda4 is reflected by a corner cube 17-b to converge on a projection fiber 18-b.

Inventors

• 👤 Norio Nishi
• 👤 功雄 西

Bibliographic Details