Fiber optic wavelength demultiplexer
First Claim
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1. A fiber optic directional demultiplexer for tapping off predetermined portions of wavelength optical energy from a single optical fiber and demultiplexing the optical energy comprising:
- a curved form for supporting an optical fiber and shaping a portion thereof to a predetermined segment of a circle;
a single optical fiber mounted on said form;
means for affixing the optical fiber along a portion thereof to the curved portion of the form of a selected radius of curvature, the fiber and affixing means in the center section of the curved portion of the fiber being lapped and polished to a preselected depth of penetration into the fiber to develop a planar surface;
prism means having a face of a predetermined characteristic angle affixed to said planar surface in contact with the optical fiber and affixed thereto by means of an optically transparent adhesive;
light diffracting means formed on said prism face in line with the path of multiplexed light coupled from the fiber to the prism and effective to reflect and diffract selected portions of said light; and
photosensitive means having plural photosensitive elements positioned adjacent said prism to respond selectively to different wavelengths of light directed from the light diffracting means.
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Abstract
An optical fiber wavelength demultiplexer including an optical fiber mounted and adhered to a curved surface having a clad single fiber core, a planar surface extending partially into and along the fiber through the cladding, a prism mounted on the surface having a reflective diffraction grating surface positioned to receive signals from the fiber travelling in one direction and demultiplex such signals, and an array of photodiodes mounted adjacent the prism to receive the demultiplexed signals.
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Citations
18 Claims
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1. A fiber optic directional demultiplexer for tapping off predetermined portions of wavelength optical energy from a single optical fiber and demultiplexing the optical energy comprising:
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a curved form for supporting an optical fiber and shaping a portion thereof to a predetermined segment of a circle; a single optical fiber mounted on said form; means for affixing the optical fiber along a portion thereof to the curved portion of the form of a selected radius of curvature, the fiber and affixing means in the center section of the curved portion of the fiber being lapped and polished to a preselected depth of penetration into the fiber to develop a planar surface; prism means having a face of a predetermined characteristic angle affixed to said planar surface in contact with the optical fiber and affixed thereto by means of an optically transparent adhesive; light diffracting means formed on said prism face in line with the path of multiplexed light coupled from the fiber to the prism and effective to reflect and diffract selected portions of said light; and photosensitive means having plural photosensitive elements positioned adjacent said prism to respond selectively to different wavelengths of light directed from the light diffracting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification