Single-mode optical fibre output not Gaussian?

In summary, the conversation discusses the appearance of a single mode fibre's speckle pattern and how it can be affected by different lasers. The provided images show that the Fibre C speckle pattern is multimode, while the Fibre A speckle pattern is ambiguous. However, it is stated that a single mode fibre's speckle pattern should always look Gaussian regardless of the laser used.
  • #1
says
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Is there anything that would make a single mode fibre's speckle pattern not look Gaussian? I've attached two images (below)

The Fibre C speckle pattern looks multimode
The Fibre A speckle pattern doesn't really look convincingly like multimode or like single mode.

A HeNe laser was used to transmit light through the fibres
 

Attachments

  • FIBREA.jpg
    FIBREA.jpg
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  • FIBREC.jpg
    FIBREC.jpg
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  • #2
.No, a single mode fibre's speckle pattern should always look Gaussian, no matter the laser used. The Fibre C image does appear to be multimode, however, which means that it is not a single mode fibre. The Fibre A image is hard to interpret, but it could be either single or multimode.
 

1. What is single-mode optical fibre output?

Single-mode optical fibre output refers to the light that is transmitted through a single-mode optical fibre, which is a type of fibre optic cable that allows only one mode or ray of light to propagate through it. This results in a higher quality and more efficient transmission of light compared to multi-mode fibres.

2. Why is it important for the single-mode optical fibre output to be Gaussian?

The Gaussian distribution, also known as the bell curve, represents a smooth and symmetrical distribution of light intensity. In the case of single-mode optical fibre output, a Gaussian distribution indicates that the light is evenly distributed and concentrated in the centre of the beam, ensuring a more stable and accurate transmission of data.

3. What factors can cause the single-mode optical fibre output to not be Gaussian?

There are several factors that can affect the Gaussian distribution of single-mode optical fibre output, including imperfections in the fibre itself, bending or stress on the fibre, and variations in the input light source. These factors can cause the light to scatter and deviate from the desired Gaussian distribution.

4. How can the non-Gaussian nature of the single-mode optical fibre output be corrected?

To correct for non-Gaussian output, various techniques can be used such as using higher quality fibres, minimizing bending and stress on the fibre, and carefully controlling the input light source. Additionally, advanced signal processing algorithms can be applied to compensate for any deviations from the desired Gaussian distribution.

5. What are the applications of single-mode optical fibre output?

Single-mode optical fibre output has a wide range of applications, including telecommunications, data transmission, fiber optic sensing, and medical imaging. Its high-quality and efficient transmission make it essential in industries where accurate and reliable data transfer is crucial.

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