Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-11-16
1997-10-21
Chin, Wellington
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359127, 385 34, H04J 1402
Patent
active
056802374
ABSTRACT:
A lensing system is provided for coupling light from one optical fiber to another through a plurality of graded index (GRIN) lenses. The system is capable of coupling light of two significantly different wavelengths in a relatively efficient manner. More specifically, a first GRIN lens having at least two ports on an outwardly facing end face is provided for coupling light of one of the wavelenghts from one of the at least two ports to another of the at least two ports. A second GRIN lens typically being about one half pitch, having an end face juxtaposed to an end face of the first GRIN lens, is provided for, in combination with the first lens, adjusting for differences in the two significantly different wavelengths, so that light will efficiently be coupled between a third graded index lens and the first graded index lens that are of different lengths to accommodate for the different wavelengths of light. The third GRIN lens has an inwardly facing end face spaced apart from an inwardly facing end face of the second GRIN lens, and includes a port on an outwardly facing end face that is optically aligned with one of the ports on the first GRIN lens. The first lens GRIN lens and the second GRIN lens in combination collimate or focus light that is traversing a gap between the inwardly facing end face of the second GRIN lens to the inwardly facing end face of the third GRIN lens.
REFERENCES:
patent: 4472797 (1984-09-01), Nicia
patent: 4550975 (1985-11-01), Levinson et al.
patent: 5076672 (1991-12-01), Tsuda et al.
patent: 5082343 (1992-01-01), Coult et al.
Bacares Rafael
Chin Wellington
JDS Fitel Inc.
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