Dual fiber variable optical attenuator
AssigneeAlliance Fiber Optics Products, Inc.
InventorsZhupei Shi, Yuqiao Liu, Jay Dehkordi, Minh Tran, Peter C. Chang, Lee Zhang
Life of this patent
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Abstract
A variable optical attenuator (200) comprises a dual fiber collimator (202) and a reflection component (206) separated by a linear moveable ND filter (204). The collimator (202) includes a ferrule (304) with dual fibers (310, 320) therein, and a GRIN lens (302) spaced from the ferrule (304) with a distance in compliance with the distance between the reflection component (206) and the GRIN lens (302).
Claims19
A dual fiber variable optical attenuator comprising:
- a dual fiber collimator, a reflection mirror, and a filter disposed therebetween;
- said dual fiber collimator including:
- a dual fiber ferrule enclosing input and output fibers therein;
- and
- a GRIN lens spaced from said ferrule with a first distance;
- wherein
- an center axis of said ferrule is laterally offset from an center axis of said GRIN lens with a second distance.
A dual fiber variable optical attenuator comprising:
- a dual fiber collimator;
- a filter and a reflection device disposed by one side of said collimator;
- said dual fiber collimator including:
- a dual fiber ferrule enclosing input and output fibers therein;
- and
- a GRIN lens spaced from the ferrule in an axial direction of said collimator;
- wherein
- an center axis of said GRIN lens is laterally offset from another center axis of said ferrule with a first distance.
A dual fiber collimator comprising:
- a dual fiber ferrule enclosing input and output fibers therein;
- and
- a GRIN lens axially spaced from said ferrule with a first distance;
- wherein
- an center axis of said GRIN lens is laterally offset from an center axis of said ferrule with a second distance.
A method of attenuating a light signal, comprising the steps of:
- providing a collimator with a ferrule having input and output fibers therein, and a GRIN lens;
- spatially positioning said ferrule and said GRIN lens with a first distance in an axial direction thereof;
- and
- spatially positioning said ferrule and said GRIN lens with a second distance in an lateral direction thereof, whereby an insertion loss on the output fiber due to an existing angle of said ferrule and said GRIN lens, can be lowered.
Dependencies are inferred from the claim text.