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Title:
OPTICAL MULTIPLEXER
Document Type and Number:
Japanese Patent JPH0792347
Kind Code:
A
Abstract:

PURPOSE: To provide a compact and inexpensive optical multiplexer/demultiplexer in which an optical loss is small by providing first to fourth specific optical input and output terminals.

CONSTITUTION: This device is provided with a first optical input and output terminal 6 from which the light of a wavelength λ1 is outputted, substrate 1 on whose one surface an optical demultiplexing film 2 for transmitting one part of the light of the wavelength λ1, and reflecting the residual light is formed, and on whose other surface opposed to the surface on which the optical demultiplexing film 2 is formed an optical multiplexing film 3 for transmitting the light of the wavelength λ1, and reflecting the light of a wavelength λ2 is formed. Also, the device is provided with a second optical input and output terminal 7 to which the light of the wavelength λ1 is inputted, a third optical input and output terminal 8 to which the light of the wavelength λ1 transmitted through the optical multiplexing film 2, substrate 1, and optical demultiplexing film 3 is inputted, and a fourth optical input and output terminal 9 from which the light of the wavelength λ2 is outputted. Then, when the refractive index of the light transparent substrate is (n), the beam diameter of the light of the wavelength λ1 outputted from the fourth optical input and output terminal 9 is (w), and an incident angle from the fourth optical input and output terminal 9 to the optical transparent substrate is θ, a thickness (t) of the optical transparent substrate can fulfill an expression.


Inventors:
Yokoyama, Jun
Application Number:
JP1993000239713
Publication Date:
April 07, 1995
Filing Date:
September 27, 1993
Export Citation:
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Assignee:
NEC CORP
International Classes:
G02B6/293; (IPC1-7): G02B6/293
Domestic Patent References:
JPH0798423A
Attorney, Agent or Firm:
京本 直樹 (外2名)