What is Fiber: Definition and 224 Discussions

Fiber or fibre (from Latin: fibra) is a natural or man-made substance that is significantly longer than it is wide. Fibers are often used in the manufacture of other materials. The strongest engineering materials often incorporate fibers, for example carbon fiber and ultra-high-molecular-weight polyethylene.
Synthetic fibers can often be produced very cheaply and in large amounts compared to natural fibers, but for clothing natural fibers can give some benefits, such as comfort, over their synthetic counterparts.

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  1. A

    Directing sunlight into the optical fiber

    Hello Is it possible to direct sunlight into the optical fiber by magnifying glass and a prism like the image below? if yes , what shape of prism should i use to do this? Thank you
  2. Jamison Lahman

    Fiber Optic Coupling -- how to couple a 200μm core fiber into a 50μm core fiber?

    Is it possible to couple a 200μm core fiber into a 50μm core fiber by using a 4x magnifier/reducer?
  3. S

    Number of modes in optical fiber

    Homework Statement Can a single mode fiber become multimode if the wavelength of the light passed through it is small enough? I put a HeNe laser (633nm) through what I thought was a single mode fiber. If it's supposed to operate at 1300nm, then would a low wavelength of 633nm cause multiple...
  4. S

    I Input-output relations for Y-Junction fiber splitter

    What is the representation of the Y-junction fiber splitter in terms of the creation operators ##\hat{a}^\dagger_P## for each port P?
  5. T

    How does Total Internal Reflection in a mm/sm fiber work?

    I know Snell's Law and I do understand that there are single and multimode fibers. A fiber carries light hence to total internal reflection. so far so good. But is it only a single mode fibre that works with total internal reflection? And if so, how does the multimode fibre carry light then?
  6. S

    Automotive Why is carbon fiber safer than steel for the cars?

    Not just for carbon fiber vs steel, I went to a seminar and heard that the team was researching how to make the steel sheets used for car making to be 'stronger', so that, a car can be safer using their material. Then, when I asked what does it actually mean when they say their improved steel...
  7. mktsgm

    Medical Fiber & Nutrients: What Benefits are Derived?

    What is fiber in food? It is said that fiber is a non-digestible starch kind of food, ie it does not contribute energy, such as carbohydrates or proteins from the food. Am I right in this understanding? If fiber is non-digestible, what good it will do to our health and why it is insisted for...
  8. R

    How does a hollow fiber membrane work to filter water?

    What is the process? And can/cannot it filter out?
  9. billy722

    Question about stress and strain of a fiber

    Homework Statement i can not find the N. what i can only found is: D0=0.02mm;V=0.25;E=10G Pa;A=π(0.02mm/2)2 ΔD=εshear×D0 εshear=εaxial×V εaxial=σaxial / E σaxial=N/A Homework EquationsThe Attempt at a Solution
  10. D

    Extreme Fiber Coupled Laser Diode Power Loss

    What could cause a laser source with fiber coupled laser diodes to have extreme loss of power? The laser diodes have a wavelength of 658nm and have an output rated at 60mW but it seems as though the optical channels actually output ranges between 58 to 70mW. During some troubleshooting I...
  11. Abdul Wali

    Regarding Fiber Optics and Coaxial Cable

    Hi, "limitations/Constraints of Fiber Optics and Coaxial cable for average home user ?"
  12. P

    A Erroneous results when solving fiber mode eigen equation

    Hi, I'm new to this forum and I couldn't find any specific sub-forum for fiber optics/waveguide theory, which my problem is regarding. Please do let me know if I should post this question some where else (and if so, where) on this forum. Anyways, here's my problem: I want to find the effective...
  13. Spinnor

    B Base space Minkowski, fiber is S^1, total spaces?

    If our base space, B, is Minkowski spacetime and our fibers are circles S^1 are the following constructions ways to put together B and S^1 and have a total space, T, that is considered a fiber bundle. Remove from Minkowski spacetime, M, a timelike line, L. At the remaining points of Minkowski...
  14. C

    Danger from damaged fiber optic cable?

    Hi all, I was not sure where to post this, so feel free to move the thread if the forum is not the most appropriate. I was reading about safety in fiber optics and the fact that one should not be staring into a fiber optic cable to avoid eye damage. That's pretty obvious, but it also raises a...
  15. baby_1

    Linearly Chirped Fiber Bragg Grating group delay

    Homework Statement Here is my problem : I want to know where does group delay equation come form? Homework Equations As I checked reference 21 it only indicates The Attempt at a Solution I'm following how can I start and solve this problem
  16. jfulky

    Internal Reflection / Fiber Optics

    Homework Statement 3. A fiber optic cable is essentially a thin fiber of plastic with n = 1.46, surrounded by a protective material with n = 1.32. The light can travel around a bend in the fiber if it can internally reflect inside the fiber. If the diameter of the fiber is d = 0.900 mm find the...
  17. J

    Discover the Weight of Carbon Fiber in a 12x40x2 Rectangular Box

    How much does a 12in(height) x 40in(length) x 2in(width) rectangular box weigh?
  18. G

    Where is the information in an optical fiber?

    Hi. I know how optical fibers work but where is the information in the light signal passing through it? Which characteristics of the electric field carry it? I begun to think about it because I was intrigued if they took into account things like the Goos-Hänchen shift or angular deviations in...
  19. T

    Water jet cuttng carbon fiber fabric

    Hello! I've just received information that there may be a requirement to cut some carbon fiber fabric on the water jet machine in our lab. The party that wants the cutting done, requires an option that's quicker than using shears to cut it. That's pretty much all the information I have at the...
  20. D

    100um Core MM Fiber connected to 50um Core 10G SFP Module

    I have two systems that are approx. 300-400ft apart that I am connecting via a 10 Gig fiber connection. The fiber I am using is a 100um core MM fiber and the switches will be using a 50um core OM4 (4700 MHz*km) SFP module. Is there a way to find out what type of loss I should be expecting, is...
  21. S

    MATLAB Center Wavelength of Fiber Bragg Grating Filter

    I would like to locate the center wavelength of a FBG notch filter in MATLAB, but I'm having trouble getting an answer within 0.01nm of the correct wavelength. So far I've tried using a quadratic fit with MATLAB, but that is too dependent on the amount of data points to the left and right of...
  22. F

    SONET protocol for data transmission over fiber optics

    hello forum, I have read about SONET which seems to be a physical layer protocol to transport data over fiber optics. SONET is a TDM (time division multiplexing method). TDM means that that time divided into slots and shared between different users. For example, given three users A, B and C...
  23. F

    Fiber Optics Qs: Mini-DIO, Fusion, Fanout Cable

    I am working in a project that contain several switchboards that will receive an optical fiber from encoders of the motors that they feed (through an optical transmitter). It appears that to do this we will need Mini-DIOs to connect this fiber cord to optical receivers, which in turn will be...
  24. I

    Optics Question -- small glass spheres to couple to fiber optic cables

    Homework Statement Homework Equations I know that yin = 0.7mm, y2 = 0mm, the index of refraction for the sphere is 1.8 and the indices of refraction for the air surrounding it is 1. The Attempt at a Solution Not sure how to even begin with the given information. I was thinking I could...
  25. caters

    Muscle Fiber Theory: Speed & Endurance Explained

    There is a theory that the type of muscle fiber an animal has most determines its speed and endurance. According to this theory the cheetah which gets exhausted after 45 seconds of chasing has mostly fast twitch muscle fibers. Also according to this theory we humans have mostly slow twitch...
  26. S

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

    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 EquationsThe Attempt at a Solution first suggestion: i placed...
  27. P

    Visualization of Fiber orientation in simple shear flow

    I need help on where i can find the numerical study and a MATLAB code on how to visualize the distribution function and orientation tensor of fibers in simple shear flow for different closures as it is shown in Fig.1 and Fig.2 of the following paper...
  28. D

    Minimizing Specular Reflections in a Sagnac based Fiber Gyro

    My project is to build an airspeed flowmeter using the design of a signac fiber optic based gyro. There is a group that has already accomplished this task (http://www.ncbi.nlm.nih.gov/pubmed/18301479), however they used a commercial fiber gyroscope whereas I am trying to build the entire setup...
  29. Padrepapp

    Coupling Xe Arc Lamp into Fiber Bundle

    Hey, we are trying to couple the light of a 75 W Xe Arc Lamp (Hamamatsu L2194) into a 800um(0,8mm) diameter fiber bundle (7 fibers). Now we have 2 plano convex lenses (25mm diameter, 30mm EFL, edmund serial #45-364), the first for collimating the second for focusing onto the fiber. We are...
  30. A

    Fiber Bragg Gratings Reflection Co-efficient

    I am studying fiber bragg gratings for a project. I read the couple-mode theory and came across a plot of the reflection coefficient v/s wavelength used which had a global maxima at the Bragg wavelength. The plot was drawn for a constant value of the coupling constant κ. I don't understand this...
  31. C4l1

    How Can the Euler-Lagrange Equations Describe Light Path in Optical Fibers?

    Homework Statement An optical fiber is one way to guide light efficiently from one point to an other. It is currently used for data communication: it offers low loss and very high bandwidth, ideal for the requirements of the internet. Generally, we can describe an optical fiber as a medium with...
  32. D

    Fiber Optic Loop: How Long Before Photon Dissipation?

    Imagine a closed loop of fiber optics, How long will a photon be able to stay inside the loop before dissipating all it's energy, or does it not dissipate?
  33. G

    The transmission profile in a fiber during tapering

    I've been reading a article about pulling a fiber (or actually making it thinner until it becomes single mode). As the fiber's diameter decreases, the transmission profile of the light is showing oscillations. The frequancy of these oscillations increases as the fiber is getting pulled. But I...
  34. E

    What Type of Lens Should I Choose for Single Mode Fiber Coupling?

    Hello What kind of lens (focal length and numerical apper.) i should choose to couple light ( wave length 1565nm, beam diameter 2mm, M-square>1) to a single mode fiber (core diameter 8 microns, mode field diameter 10 microns and NA=0.14)? Any thoughts Thank you
  35. O

    Finally, fiber to the premises-- FTTP

    After living under a satellite dish for 20 or so years... Click the picture... ↓ We have internet service that is actually... usable internet service... LoL http://testmy.net/compID/60629002676 Man, it's a big change... Love it. :oldbiggrin...
  36. S

    Refraction through an optical fiber

    Homework Statement Given a "new type" of optical fiber (index of refraction n = 1.23), a laser beam is incident on the flat end of a straight fiber in air. Assume nair = 1.00. What is the maximum angle of incidence Ø1 if the beam is not to escape from the fiber? (See attached file for...
  37. P

    BPSK Fiber Optic Communication technique module.

    Actually out of my personal interest to learn & upgrade my skills I have self volunteered self development of Photonics Simulation software on Python platform. I am basically a software developer. As such I seek some technical information for same related to its development activity. Can you...
  38. R

    What materials are best for creating fiber optics from seaweed or jelly?

    I want to make fiber optics from seaweed or jelly.. It will be happen? Please give me the literature or journal.. Thank you very much for helping me.. :)
  39. I

    Fiber Optic Gyros: Accuracy & Price | Camera/Gun Stabilization

    Hello every body. Has anybody used Fiber Optic Gyros? How accurate they are? How about the price range? Could anybody help me select a suitable actuator system/motor mechanism for, say a camera stabilization or a gun stabilization using a fiber optic gyro. I want to get rid of mechanical gyros.
  40. Gilbert

    FBG Wavelength Reflection in Double-Clad MMF for 910 nm Laser Diode

    Hi everyone! I use a FBG in a double-clad multimode optical fiber of 20 µm core diameter, and a laser diode working at 910 nm as ligth source. As the Bragg reflection wavelength of a FBG depends on the effective refractive index of the different guided modes (λFBG=2.neff.Λ , where Λ is the...
  41. A

    Programs Image processing skills in biosensors and fiber optics

    I am currently pursuing a Master's degree in physics with optics as my major and my interests are fiber optics and biosensors. I have also worked on a couple of projects in the past that dealt with a lot of image processing. I will soon begin working on my Master's thesis and want to decide a...
  42. C

    Does CNS in spine have single fiber per inervated muscle?

    if I can move specific muscle in my toe via brain command, does this mean that in spinal cord there is a specific fiber that extends from brain to that toe? And let's say if in a lab rat we cut that single CNS fiber, the muscle affected will stop working without any other consequences to the...
  43. T

    Carbon Fiber Strip Buckling Force Problem

    Hey, So I`ve been trying to wrap my mind on how to solve this problem. I`m trying to use a CFRP Sheet as sort of a spring actuator by using it`s buckling phenomena to deliver a force to the body it`s attached to. Kind of vague so here is a video: This video does it electrically, but I...
  44. M

    Is a Corona Flash System Using Fiber Optics and Lens Physics Possible?

    Whom might be talking on this area?
  45. M

    Divergence angle of light exiting a nano-etched single mode fiber

    I am working with a single mode fiber at 830 nm with a NA of 0.12 (http://www.thorlabs.com/thorcat/19600/P3-830A-FC-2-AutoCADPDF.pdf). One end has a fiber tip coated in silver with a small hole of 200 nm diameter to essentially create a point source. My advisor told me that the fiber has a few...
  46. E

    Understanding the Phase Shift Formula in Stimulated Brillouin Scattering

    Good morning I need to ask about the exact formula for the phase shift used in stimulated Brillouin scattering especially in the phase shifter thank you
  47. L

    Determine the strain rate for a material fiber

    Homework Statement Determine the Strain Rate for a Material Fiber in the direction of the surface normal. The Velocity Field is V=((4y-3x)i+(5x+3y)j) ft/s http://puu.sh/9hQ7Q/2bda80620f.jpg is the picture which describes a steady, planar flow where i and j are unit vectors. Homework...
  48. S

    Disadvantagês of Stêp Indêx Fibêr

    Hello experts! I wonder if there are any disadvantagês of Stêp Indêx Fibêr? I searched for my knowledge but only found advantagês. Thank you all.
  49. E

    Highly nonlinear fiber and SBS

    Hello everyone I really need to ask if someone could show me a paper for the maximum gain peak of SBS in HNLF or any parameters having to do with SBS for highly non linear fiber ?? I really tried to look at many papers but nothing concerning Stimulated Brillouin Scattering(SBS) Thank you
  50. E

    If p is a covering map with B compact and fiber of b finite, E compact

    Homework Statement Let p: E \rightarrow B be a covering map. If B is compact andp^{-1}(b) is finite for each b in B, then E compact. Note: This is a problem from Munkres pg 341, question 6b in section 54. The Attempt at a Solution I begin with a cover of E denote it \{U_\alpha\}. I...
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