Optical: systems and elements – Lens – Anamorphic
Patent
1998-05-06
1999-10-26
Epps, Georgia
Optical: systems and elements
Lens
Anamorphic
359710, 359796, 385 34, G02B 1308, G02B 306, G02B 900, G02B 632
Patent
active
059738537
ABSTRACT:
A system for providing efficient coupling between an elliptical mode laser source and a single mode transmission fiber is disclosed. In one embodiment, the system comprises a cruciform cylindrical lens formed as a pair of perpendicular cylindrical lenses to provide for separate magnification of the "fast" diverging component (i.e., this component passes through a "fast" cylindrical lens) and the "slow" diverging component of the beam (i.e., this component passes through a "slow" cylindrical lens). By decoupling the magnification requirements of the components of the elliptical beam, the beam may be transformed into an essentially circular beam, appropriate for coupling into a single mode fiber. In one arrangement of the present invention, a coupling efficiency of approximately 90% is possible (as compared with prior art coupling efficiency of about 44%). In an alternative embodiment, the pair of cylindrical lenses may be replaced by a monolithic lens, formed to comprise orthogonal front and rear cylindrical surfaces.
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Gaebe Carl Edward
Huang Sun-Huan
Miller Kimberly A.
Stakelon Thomas Stanley
Wiand Gary T.
Epps Georgia
Lester Evelyn A.
Lucent Technologies - Inc.
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