# Questions tagged [fiber-optics]

Fiber optics is the study of optical fibers, which are thin pieces of high quality optical materials which are able to act as a waveguide for some frequencies of light. This waveguide or 'light pipe' feature of optical fibers allows them to transmit light with very low loss from one end of the fiber to the other.

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### Model of a fiber amplifier using RK4 gives me weird results [closed]

I am modeling pulse evolution through fibers (with non linearities and dispersion). I successfully built a model using the Split Step Fourier. The results are quite convincing and I am trying to get ...
1 vote
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### Fiber Beam Splitter for Quantum Optics

I am conducting an experiment involving HOM interference. I cannot find a definitive answer as to whether a free-space beam splitter will behave identically to a 50:50 fiber coupler, such as this one ...
1 vote
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### Why is Group Delay Dispersion excluded from the Split Step Fourier Method?

I have been looking recently into the Split Step Fourier Method (SSFM) for propagating optical pulses in fibers. The SSFM is used to solve the Nonlinear Schrödinger Equation (NLSE) where various ...
1 vote
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### What is the difference between dispersion and differential mode group delay?

I want to know what exactly is the differential mode group delay in optical fibers, is it the same thing as dispersion?
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### Method to measure zeroth order propagation constant of optical fibers ($\beta_0$)

In the Taylor series expansion of the mode-propagation constant $𝛽$ in optical fibers, we have multiple terms known as $𝛽_0$, $𝛽_1$, $𝛽_2$, etc. The terms $𝛽_1$, $𝛽_2$, and higher can be ...
1 vote
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### Zero-dispersion wavelength

Please help me understanding the zero-dispersion wavelength in fibers. I found this wiki-article on the topic. Accordingly: "In a single-mode optical fiber, the zero-dispersion wavelength is the ...
1 vote
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How about optical fiber without cladding and directly coated? I have got some answers from here, but how about optical fiber without cladding and directly coated? and the coating material have a ...
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### What is the formal definition of Coupling efficiency

Does anyone knows the formal definition of Coupling efficiency? I have been reading the term in photonics devices and optics. I have been searching for it, but I could not find any. Thanks for the ...
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### Field propagation in metamaterial based optical fibres?

We have an optical fibre having HMM cladding ( $\mu=1$ and have a permittivity tensor with one component different in sign than others) and a core having permittivity equal to one. How will light ...
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### When building a fiber optic interferometer what methods are used to reduce microphonic effects?

When building a fiber optic interferometer what methods are used to reduce microphonic effects? I'm familiar with a few methods such as: enclosing the interferometer under a sound dampening cover, ...
370 views

### Wave vector relation in nonlinear material

A light wave ($k_1,\omega_1$) travels in a medium of refractive index $n_1$ and then encounters a nonlinear medium ($n_2$) under the angle $\theta_1$. Snell's law tells us the wave's direction in the ...
1 vote
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### Are there any commercially made optical fibers which are made specifically to have very low microphonic properties for application in interferometry

Are there any commercially made optical fibers which are made specifically to have very low microphonic properties for applications in interferometry. While building a fiber optic interferometer I ...
1 vote
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### Why laser output power fluctuates after passing through two 1x2 fiber optic couplers?

When laser source is launched into two 1x2 50/50 fiber optic couplers connected as below the output power constantly fluctuates in range of 70 uW. The fluctuation happen roughly one to two times per ...
428 views

### What is the best way to couple diffuse light into a single-mode fiber?

I understand the requisites to couple a laser beam into a single-mode fiber, including mode-field diameter and numerical aperture. However, when trying to couple diffuse light into a single-mode fiber,...
1 vote
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### Understanding the use of Group Velocity Dispersion Optics

I am a bit confused on the topic of GVD. Most information I read on the topic tells me something like this: "GVD means that the group velocity will be different for different wavelengths in the ...
1 vote
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### How does an endoscope form the image?

I am trying to do ray tracing for an endoscope, but I don't see how it could form a sharp image that could be viewed at the eyepiece. In the diagram the box in the middle is the "fiber", but ...
25 views

### Dependency of attenuation in optic fibers on wavelength of light

I have read and heard that scattering, and attenuation in general increase with frequency. However, in an experiment we did as a part of our course, we found that attenuation constant for light of ...
1 vote
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### How does MEMS low insertion loss fiber optic switch work? [closed]

I'm currently looking for a low insertion loss fiber optic switch to be able to change the light source of a spectrometer. Since this will be used in harsh conditions, I was hoping to find one with no ...
1 vote