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Wavelength multiplexed light transfer unit and wavelength multiplexed light transfer system

  • US 5,793,908 A
  • Filed: 07/26/1996
  • Issued: 08/11/1998
  • Est. Priority Date: 08/24/1995
  • Status: Expired due to Fees
First Claim
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1. A wavelength multiplexed light transfer unit comprising:

  • a first optical filter having a first terminal for receiving a light signal having a specified wavelength λ

    2 as well as a light signal having a wavelength other than the wavelength λ

    2, a second terminal for outputting the light signal having a wavelength λ

    2 inputted into said first terminal, a third terminal for outputting a light signal having a wavelength other than the wavelength λ

    2 inputted into said first terminal;

    a second optical filter having a fourth terminal for receiving the light signal having a wavelength other than the wavelength λ

    2 outputted from the third terminal of said first optical filter, a fifth terminal for receiving the light signal having the specified wavelength λ

    2, and a sixth terminal for outputting the light signal having a wavelength other than the wavelength λ

    2 inputted into said fourth terminal as well as a transmitted light signal having a wavelength λ

    2 inputted into said fifth terminal,a third optical filter having a seventh terminal for receiving a light signal having a specified wavelength λ

    1 as well as a light signal having a wavelength other than the wavelength λ

    1, an eighth terminal for outputting the light signal having a specified wavelength λ

    2 as well as a light signal having a wavelength λ

    1 inputted into said seventh terminal, a ninth terminal for receiving a light signal having a wavelength λ

    2 outputted to said eighth terminal, and a tenth terminal for outputting a light signal having a wavelength other than the wavelength λ

    1 received from said seventh terminal; and

    a fourth optical filter having a twelfth terminal for receiving the light signal having a wavelength other than the wavelength λ

    1 outputted from the tenth terminal of said third optical filter, a thirteenth terminal for receiving the light signal having the specified wavelength λ

    1 as well as the light signal having a specified wavelength λ

    2, a fourteenth terminal for outputting the light signal having a wavelength λ

    1 received from said thirteenth terminal as well as a light signal having a wavelength other than the wavelength λ

    1 received from said twelfth terminal, and an eleventh terminal for outputting the light signal having a wavelength λ

    2 received from said thirteenth terminal;

    wherein said second terminal and said eleventh terminal are connected to each other, and said fifth terminal and said ninth terminal are connected to each other.

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