Patent ID: 7920763
Filing Date: 2011-04-05
Classification: G02B

Abstract:
1. An optical fiber collimator suitable for coupling optical radiation from an optical fiber to an output optical device, said optical fiber collimator comprising: a graded-index multi-mode fiber segment for expanding the mode of the optical radiation transmitted from the optical fiber; a collimating lens for collimating said mode expanded optical radiation received from said graded-index multi-mode fiber segment, said collimating lens providing said collimated mode expanded optical radiation for coupling into the output optical device; and a step index fiber segment disposed between said graded index multi-mode fiber segment and said collimating lens; said step index fiber segment having a fundamental mode field that is matched with said graded-index multi-mode fiber segment for maintaining an essentially constant mode field diameter for mode expanded optical radiation transmitted in said step index fiber segment; said collimating lens being disposed away from and detached from said step index fiber segment.