Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1974-11-11
1976-01-06
Stolwein, Walter
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250216, 350 96C, G02B 514
Patent
active
039315185
ABSTRACT:
In an optical fiber power tap, signal power is coupled out of an optical fiber waveguide by a dielectric body disposed in a coupling relationship laterally offset from an intermediate length of the fiber, and is converted to a representative electrical signal suitable for utilization by a photodetector disposed adjacent to the dielectric body. In accordance with the disclosed invention, the operation of the fiber tap is improved by combining therewith means for coupling a portion of the signal power in the fiber from lower order modes to higher order modes. The mode coupling means illustratively comprises a pair of corrugated plates which is pressed against the fiber to periodically deform a region of the fiber just preceding the fiber tap. Provided the spatial periodicity of the corrugations in the plates is properly selected, and the pressure exerted on the plates is sufficiently large, the periodic deformation of the fiber causes the desired higher order mode coupling, and assures that there is sufficient power distributed in the higher order modes of the fiber for the dielectric coupling body of the fiber tap to couple out. The mode coupling means can be employed to provide an adjustable optical fiber tap, and can facilitate the tapping of clad fiber waveguides.
REFERENCES:
patent: 3058021 (1962-10-01), Dunn
patent: 3274392 (1966-09-01), Harling
patent: 3350654 (1917-10-01), Snitzer
patent: 3412255 (1968-11-01), Kreiger
patent: 3508589 (1970-04-01), Derick et al.
patent: 3773289 (1973-11-01), Gloge
patent: 3777149 (1973-12-01), Marcatili
patent: 3801389 (1974-04-01), Fujimara
Bell Telephone Laboratories Incorporated
O'Konski Thomas C.
Stolwein Walter
Wisner Wilford L.
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