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Light diplexer of a communication system comprising three light connections

  • US 4,776,660 A
  • Filed: 01/27/1987
  • Issued: 10/11/1988
  • Est. Priority Date: 01/31/1986
  • Status: Expired due to Fees
First Claim
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1. In a light diplexer unit for a communication system, said diplexer including a solid block having a straight groove containing a glass fiber to provide first, second and third glass fiber regions, a first means for forming a first light connection for coupling light to the fiber at the first glass fiber region, a third means for forming a third light connection for optically coupling to the glass fiber in the third glass fiber region, said second glass fiber region being positioned between the first and third glass fiber regions and including a partially light transmitting mirror having a plane extending obliquely relative to the axis of the glass fiber to form second means which forms a second light connection, said plane having a normal extending out of the block and forming an acute angle of incidence with the axis of the neighboring glass fiber extending towards the first means, a light receiving semiconductor member having a light-sensitive location being secured on the block in the second glass fiber region close to the second light connection to receive light from said second connection without any additional glass fibers extending from the second connection to the light sensitive location, said mirror including a light wavelength filter of a plurality of vapor deposited layers for reflecting light of a first range of light wavelengths out of the fiber onto the light sensitive location of the light receiving semiconductor member while transmitting light of a second range of light wavelengths coupled into the glass fiber at the third light connection to pass to the first light connection, the improvements comprising the groove being applied in a planar block surface of a cuboid block and the angle of incidence being less than 45°

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