Where to place a thin lens to couple a ray into a fiber

In summary, the conversation discusses the need to couple a ray from a point source at 15 degrees into a fiber with a small core diameter located 8cm away. The focal distance of the lens is 1.5cm and there are two possible locations suggested: placing the lens at the focal distance from the fiber or in the middle between the source and the fiber. The question raises concerns about the correctness of these suggestions and asks about the relationship between focal length, object distance, and image distance.
  • #1
STINGERX
10
0

Homework Statement


i need to couple a ray (point source 15 deg) into a fiber with a small core diameter, the fiber located 8cm from the source.
the focal distance of the lens is 1.5cm
i need to choose 2 possible locations

Homework Equations

The Attempt at a Solution


first suggestion:
i placed the lense in the focal distance from the fiber

second suggestion:
i placed the lense in the middle between the source and the fiber (in this location the transverse magnification equal to -1 meaning that the point source will not get bigger,am i correct?
 
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  • #2
Neither of those locations seems correct to me. The central location is an especially poor choice.

How are the focal length, the object distance, and the image distance all related?
 

FAQ: Where to place a thin lens to couple a ray into a fiber

What is a thin lens?

A thin lens is an optical device made of transparent material with curved surfaces that can refract or bend light rays. It is typically used to focus or redirect light.

What is fiber coupling?

Fiber coupling is the process of aligning and connecting a thin optical fiber to an optical device, such as a lens, to efficiently transmit light between them.

Why is it important to place the lens in the correct position for fiber coupling?

The position of the lens is critical for efficient fiber coupling because it determines the angle and position at which the light enters the fiber. If the lens is not properly placed, some or all of the light may not be coupled into the fiber, resulting in loss of signal or decreased transmission efficiency.

How do I determine the correct placement for a thin lens in fiber coupling?

The exact placement of the lens will depend on factors such as the type of fiber, the angle of incidence, and the desired coupling efficiency. This can be determined through calculations or experimentation, but it is generally recommended to consult a guide or expert for specific applications.

What are some common techniques for placing a thin lens for fiber coupling?

Some common techniques for placing a thin lens for fiber coupling include using a lens mount or holder, using a microscope for precise alignment, and using software or alignment tools to aid in positioning. Ultimately, the best technique will depend on the specific setup and requirements of the coupling process.

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