Patent
Wavelength-division multiplexing optical transmission system
Tatsuro Kunikane,Takashi Yokota +1 more
TLDR
In this article, a wavelength division multiplexing optical transmission system is disclosed which transmits light of wavelengths λ 1, λ 2 and λ 3 (λ 1 <λ 2 <λ 3) by way of a single optical fiber.Abstract:
A wavelength-division multiplexing optical transmission system is disclosed which transmits light of wavelengths λ1, λ2 and λ3 (λ1 <λ2 <λ3) by way of a single optical fiber. An optical multiplexer/demultiplexer of the filter type is used which includes a parallelogram prism, a first filter formed on a side face of the parallelogram prism, and second and third filters formed on the opposite side face of the parallelogram. Bidirectional optical fiber communications between the central telephone exchange side and a subscriber side can be achieved using such optical multiplexer/demultiplexer of the filter type. With the arrangement of the invention, an optical multiplexer/demultiplexer of the filter type can be produced at a low cost without the necessity of using a filter having a wide stopping band as a filter to be formed on a parallelogram prism.read more
Citations
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Yaoqi Joe Liu,Bruce A. Nerad,Laurence R. Gilbert,Robert L. Brott,Michael F. Weber,Kelly M. Roscoe,John A. Wheatley +6 more
TL;DR: In a multilayer dielectric reflector, different portions of the surface have different coupling efficiencies for coupling light having a high propagation angle into the multi-layer reflector.
References
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Patent
Optical branching filter
TL;DR: In this article, an optical branching filter branches or mixes lights of n-kind of wavelengths, and an input/output port for the light mixed with other wavelengths is provided to one of two surfaces of the transparent block.
Patent
Optical branching device with internal waveguide
Tetsuya Yamasaki,Eiji Okuda +1 more
TL;DR: An optical waveguide as mentioned in this paper is a region formed in a transparent substrate and has a refractive index higher than that of the transparent substrate, which can be used for optical fiber communication.
Patent
Wavelength selective mirror systems
TL;DR: In this article, a beam-splitter is used to separate polychromatic beams into component colors or wavelength bands by wavelength selective filters combined with a beamsplitter, where the filters are arranged on three sides of a cubic space with a beam on the diagonal.
Patent
Beam splitting prism system for color television
TL;DR: In this paper, a first range passes through a dichroic coating separating double prisms, and a second range is reflected and a third range is partially reflected and partially transmitted according to polarization.