Non-imaging lens assembly design for efficient power coupling from multimode fiber to small-area photodetectors
First Claim
1. An optical communication device comprising:
- a photodetector;
an optical fiber configured to output light;
a first lens including a first surface and a second surface and having an image plane, the first lens being configured to receive the light output from the optical fiber, the received light having a first cross-sectional area at the first surface, wherein a diameter of the first lens is at least 2 tan(θ
)d, where θ
is a numerical aperture of the optical fiber and d is a distance between an output plane of the optical fiber and the first lens; and
a second lens including a third surface positioned at the image plane of the first lens and a fourth surface positioned adjacent to the photodetector, the second lens being configured to receive the light output from the first lens and to output light having a second cross-sectional area at the fourth surface that is smaller than the first cross-sectional area.
1 Assignment
0 Petitions
Accused Products
Abstract
The disclosure provides for an optical communication device that includes a photodetector, an optical fiber, a first lens, and a second lens. The optical fiber may be configured to relay light. The first lens may include a first surface and a second surface and has an image plane. The first lens may be configured to receive the light output from the optical fiber, where the received light has a first cross-sectional area at the first surface. The second lens may include a third surface positioned at the image plane of the first lens and a fourth surface positioned adjacent to the photodetector. The second lens may be configured to receive the light output from the first lens and to output light having a second cross-sectional area at the fourth surface that is smaller than the first cross-sectional area.
12 Citations
15 Claims
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1. An optical communication device comprising:
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a photodetector; an optical fiber configured to output light; a first lens including a first surface and a second surface and having an image plane, the first lens being configured to receive the light output from the optical fiber, the received light having a first cross-sectional area at the first surface, wherein a diameter of the first lens is at least 2 tan(θ
)d, where θ
is a numerical aperture of the optical fiber and d is a distance between an output plane of the optical fiber and the first lens; anda second lens including a third surface positioned at the image plane of the first lens and a fourth surface positioned adjacent to the photodetector, the second lens being configured to receive the light output from the first lens and to output light having a second cross-sectional area at the fourth surface that is smaller than the first cross-sectional area. - View Dependent Claims (2, 3, 4, 5, 6, 13)
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7. A lens system of an optical communication device, the lens system comprising:
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a first lens including a first surface and a second surface and having an image plane, the first lens being configured to receive light having a first cross-sectional area at the first surface, wherein a diameter of the first lens is at least 2 tan(θ
)d, where θ
is a numerical aperture of an optical fiber that outputs the received light and d is a distance between an output plane of the optical fiber and the first lens; anda second lens including a third surface positioned at the image plane of the first lens and a fourth surface positioned adjacent to a photodetector, the second lens being configured to receive the light output from the first lens and to output light having a second cross-sectional area at the fourth surface that is smaller than the first cross-sectional area. - View Dependent Claims (8, 9, 10, 11, 14)
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12. A method of processing an optical signal, the method including:
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emitting light from an optical fiber of an optical communication device; receiving the light at a first lens; focusing the light using the first lens at an image plane; receiving the light at a second lens positioned at the image plane, wherein a diameter of the second lens is at least equal to a diameter of the optical fiber multiplied by a magnification of the first lens; focusing the light at a photodetector positioned adjacent to the second lens; and operating, by one or more processors, the optical communication device according to the light received at the photodetector. - View Dependent Claims (15)
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Specification