Article comprising means for mode-selective launch into a multimode optical fiber, and method for a mode-selective launch
First Claim
1. A method of launching a light beam from a semiconductor light source into a multimode optical fiber, the multimode fiber having an axis and an input face, the semiconductor light source having an axis and an output face, the light beam being, at least between said output face and said input face, an unguided light beam;
- wherein the method comprises directing said unguided light beam onto said input face of the multimode fiber nominally at the center of the input face, the unguided light beam being directed such that the light beam at incidence on said input face forms an angle θ
b with a direction perpendicular to said input face, with θ
b selected such that at least one lower order mode of a guided radiation being substantially not excited in the multimode fiber, with at least some higher order modes being substantially excited.
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Abstract
Disclosed is a method of launching a light beam from a semiconductor laser into a multimode optical fiber, as well as apparatus for launching the light beam. The light beam is directed at nominally the center of the input face of the multimode fiber such that the (unguided) light beam makes an angle θb (typically in the range 1-20 degrees) with the direction perpendicular to the input face of the multimode fiber. The angle θb is selected such that at least one lower order mode of the guided radiation in the multimode fiber is substantially not excited in the fiber, with at least some higher order modes being substantially excited. Several specific embodiments are disclosed.
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Citations
7 Claims
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1. A method of launching a light beam from a semiconductor light source into a multimode optical fiber, the multimode fiber having an axis and an input face, the semiconductor light source having an axis and an output face, the light beam being, at least between said output face and said input face, an unguided light beam;
- wherein the method comprises directing said unguided light beam onto said input face of the multimode fiber nominally at the center of the input face, the unguided light beam being directed such that the light beam at incidence on said input face forms an angle θ
b with a direction perpendicular to said input face, with θ
b selected such that at least one lower order mode of a guided radiation being substantially not excited in the multimode fiber, with at least some higher order modes being substantially excited. - View Dependent Claims (2, 3, 4, 5, 6)
- wherein the method comprises directing said unguided light beam onto said input face of the multimode fiber nominally at the center of the input face, the unguided light beam being directed such that the light beam at incidence on said input face forms an angle θ
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7. Apparatus for launching a light beam from a semiconductor laser into a multimode optic fiber, the multimode fiber having an axis and an input face, the semiconductor laser having an axis and an output face, with the light beam being, at least between said output face and said input face, an unguided light beam;
- wherein the apparatus is selected to direct the unguided light from the output face of the semiconductor laser onto the input face of the multimode fiber nominally at the center of the input face, and is further directed such that the light beam at incidence on the input face forms an angle θ
b with the direction perpendicular to the input face, with θ
b being in the range 1-20 degrees.
- wherein the apparatus is selected to direct the unguided light from the output face of the semiconductor laser onto the input face of the multimode fiber nominally at the center of the input face, and is further directed such that the light beam at incidence on the input face forms an angle θ
Specification
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- Resources
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Current AssigneeWSOU Investments, LLC (WSOU Holdings, LLC)
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Original AssigneeLucent Technologies, Inc. (Nokia Corporation)
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InventorsReed, William Alfred, Golowich, Steven Eugene
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Primary Examiner(s)Spyrou, Cassandra
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Assistant Examiner(s)Boutsikaris, Leo
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Application NumberUS09/608,364Time in Patent Office914 DaysField of Search385/38, 385/31, 385/27, 385/28, 385/39, 385/48, 385/90, 385/50, 385/88US Class Current385/38CPC Class CodesG02B 6/262 Optical details of coupling...G02B 6/4204 the coupling comprising int...
