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US 5,291,571 AGranted
Duplicated light source module
AssigneeFujitsu Limited
InventorsTatsuro Kunikane, Saburo Uno, Nobuhiro Fukushima
Life of this patent
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Abstract
Disclosed herein is a duplicated light source module constructed so that rays of light emitted from two light sources pass through one lens and then enter one optical fiber through a birefringent element. This module is useful when a light source in an optical transmitter is intended to be duplicated or when a high-power pumping source in an optical fiber amplifier is required.
Claims16
A light source module having a first light source, a second light source and an optical fiber optically coupled with said first and second light sources, said light source module comprising:
- a first assembly comprising said first and second light sources arranged so that a plane of polarization of light emitted from said first light source is perpendicular to a plane of polarization of light emitted from said second light source;
- a first lens having a principal axis positioned between a first principal axis of said light emitted from said first light source and a second principal axis of said light emitted from said second light source;
- a birefringent element for receiving said light emitted from said first and second light sources and passed through said first lens and for outputting light on a single optical path;
- a second assembly comprising said optical fiber arranged so that said light output from said birefringent element enters an end of said optical fiber;
- and
- holding means for holding said first lens and said birefringent element to said first assembly and said second assembly so as to maintain predetermined positional relation.
3 more elements
Dependencies are inferred from the claim text.