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. R

    Increase Laser Power out of fiber optic

    I am working on a project and am combining three laser beams in an effort to make artificial white light out of the end of the fiber. It is currently producing about 1 mw of power. How could I increase the power out of the end of the optical fiber?
  2. M

    Will a Carbon Fiber Car Frame Affect the Handling of My Electric Mini Cooper?

    hi, I've been toying with the idea of converting my mini cooper to an electric car, and I'm brainstorming ways to reduce the weight as much as possible. I came up with the idea of a carbon fiber frame to replace the heavy steel one, I found a company that can do it for me, but I was wondering...
  3. nismaratwork

    Carbon Fiber Car Frames: Really?

    http://news.blogs.cnn.com/2011/03/09/japanese-company-announces-breakthrough-in-carbon-fiber-technology/ Is this really feasible? I was under the impression that mass production of carbon fiber structures like this was still too slow and the fiber too expensive to make? Obviously I'm...
  4. K

    How Do Optic Fibers Minimize Interference While Transmitting Information?

    In optic fibers the how do v transmitt the information? will not there be interference of light as different wavelength of light travel in core?
  5. P

    Light in an optical fiber - variational calculus

    Homework Statement Homework Equations \frac{\delta{F}}{\delta{y}} - \frac{d}{dx}\frac{\delta{F}}{\delta{y'}} = 0The Attempt at a Solution I'm having trouble setting this one up. If I let the functional be F(x,x',y) = n(y)\sqrt{1+(x')^2} Applying the LE equation I obtain...
  6. N

    How should I understand the dispersion in fiber optics?

    Homework Statement What is the physical definition of this graph and the unit of dispersion? I know it is picosec/(km times nm), but I am not sure for what it refers to. Homework Equations The Attempt at a Solution I asked my mates for the meaning and I typed them on the right of...
  7. Y

    Maximum length of an optical fiber

    Hi all, I have a question regarding a fiber optics based communications system: The light source is a Fabry-Perot LASER, which outputs 5 longitudinal modes. The communication rates are: \Delta\omega=100Grads^{-1}, B=10Gbs^{-1}, and the dispersion coefficient is \beta_{2}=10\frac{ps^{2}}{Km}...
  8. B

    Calculate optical path in SELFOC cylindrical fiber optic

    Hi. This is my first message in this forum. I'm not English, so sorry my spelling. Homework Statement Calculate the optical path done by a meridional ray, supposing it covers a horizontal distance, d, in z-axis direction. \gamma_0 is the launch angle (with z-axis).Homework Equations Optical...
  9. C

    Interference Patterns in Optical Fibers: Causes and Solutions

    Hey all I am using optical fibers as a read-out medium form a PCB. I see interference in the data through this fiber. Can someone shed a light on the interference patterns on the optical fiber? Usually one should not see any electronic noise in fibers. How true is it and how to get around it...
  10. F

    How Effective Is a Fresnel Lens in Transporting Light Through Fiber Optics?

    Hello, I have a 12x12" fresnel lens and I want to place a 14mm diameter fiber optics cable at the focal point to transport the light ~2.5 ft. Would there be any heat loss? And what percentage of the light would exit the fiber optics? Thanks, Fritz Laun
  11. Rasalhague

    Fiber Bundle Basics: An Overview of Penrose's Twisted Bundles

    In The Road to Reality, § 15.2, Roger Penrose introduces the concept of a fibre bundle. Here I'll modify his notation to that of Wikipedia and other sources, so that B stands for base space (rather than the bundle), F for fibre, and E for the total space, which I think Penrose calls the (fibre)...
  12. B

    Fiber Optic Cleaning Systems

    Can anyone describe basic inspection techniques and processes of cleaning for fiber optic cables
  13. N

    Measuring the angle of incidence into a fiber

    Hello everyone, I'm currently working on a little project that has been puzzling me for some time. If you send a laser beam into a fiber, the ingoing angle is sometimes slightly different than the outgoing angle. To measure this ratio of angles, I am currently using a setup that looks like...
  14. B

    Classifying Bundles; Fixed Base and Fiber

    Hi, everyone: I am trying to find a result for the number of bundles (up to bundle iso.) over a fixed base and fixed fiber. For example, for B=S<sup>1</sup> , and fiber I=[0,1] I think that there are two; the cylinder and the Mobius strip. I think that the reason there are...
  15. A

    Fiber Optic Illumination System Research: Calculating Power & Length

    Hello everyone, Am having a research about the use of fiber optics in illuminating a room for example by taking solar power. What are the formulas that are used in order to know how much length do we need and how many fibers we need in order to have for example the power of a 60 watt lamp...
  16. J

    Optical Path length in core fiber of fiber optic faceplate

    Homework Statement Sorry if this is the wrong section. Please redirect me if there is a more appropriate one. I'm looking at the timing spread in the time of flight of photons through fibers in a fiber optic faceplate. Essentially the minimum time for photons to propagate through one of the...
  17. C

    1000Base-T vs 1000Base-X (Copper vs Fiber) design guidelines

    I'm currently designing a dual port 1000Base-T Gigabit Ethernet circuit card. My problem is that I do not have much space to work with on my board and the dual port RJ45 Magjack is taking up a ton of space. To save space I've been looking to switch to a fiber-optic system with much smaller...
  18. M

    Global Section of Fiber Bundles with Contractible Fiber

    Is it true in complete generality that every fiber bundle with contractible fiber have a global section? Or do some sort of restrictions on the bundle need to be made? I ran across a mention of this fact in Guillemin and Sternberg's "Supersymmetry..." and I'm not sure how to prove it.
  19. T

    BER output problem for Radio over Fiber system/Optical Comm

    Hi guys, this is my first work in optical and first simulation in matlab. I am sorry if there is mistake and I am really new to this. Here is what I did, I am simulation an entire Radio Over Fiber system with Matlab, linear system. Let me insert my code first...
  20. D

    Searching for Fiber Optic Information? Look No Further!

    Does anyone know of any links to some good fiber optic information? I'm not looking for suppliers or sales pitches...rather something like www.Microwaves101.com , but for fiber optics... Other than arguments on comparisons, I haven't found too much in PF. Thanks.
  21. G

    Help needed: coupling light from a LED into an optical fiber

    First let me preface this by saying by physics-fu is remedial at best. I am a neuroscientist by training, but need a little help with piece of equipment I am designing, so any ideas or input would be greatly appreciated. Basically, I need to figure out a way to efficiently couple a light...
  22. B

    Which Book on Fiber Bundles is Best for Beginners with an Intuitive Approach?

    Becuase of geometric phase,I'm looking for a good book on fiber bundles, with a minimum of prerequistes and that takes a more intutive rather than formal approach.I am reading a book called modern differential geometry for physicists. It is a good book but sometimes abstract. I know about...
  23. N

    Refraction and fiber optic cable diameter

    Hello there, I'm wondering if there is any restricting reason why fiber optic cables are not made thicker. Regardless of the practical applications, is there any reason you can't make a fiber optic cable that is only 2m long but 2cm thick (compared to the normal 0.0125 cm thick)? Does width of...
  24. T

    Fiber optic internet connection?

    In a few days, people from my ISP are coming to my house to install super-fast fiber optic internet. Right now, I am using a DSL, or about a 3-meg connection speed. According to what I've heard, a fiber-optic network connection can give up to 20 megs. I use my computer for gaming, especially...
  25. J

    Power over Fiber residential application

    I have a problem that can't be solved. So then, I put it to this Physics Forum to see if anyone comes up with a brain storm ( or directs me to a solution which my expert may have been unaware of ). Doing Power over Fiber is "impossible" today for a broad-based residential application...
  26. B

    Submersion and fiber bundles

    How would one go about to construct a function on (smooth) manifolds that is a submersion without being (the projection map of) a fiber bundle?
  27. W

    Fiber Optics Project: Determining Refractive Index w/ Int.

    Hello everybody I have my project on "Determination of some parameters (mainly the refractive index)of an optical fiber using multiple beam interference" i need some data about : Fizeau fringes shape derivation of an optical wedge at transmition and reflection. any help..?
  28. P

    I need the acoustic properties of all materials more specifically carbon fiber

    Does anybody know the acoustic properties of carbon fiber. I've used google extensively but I've had no success. Is there a well known reference book within the materials engineering realm that gives the sound absorption coefficient (also known as the Noise Reduction Coefficient (NRC)) of varius...
  29. hxtasy

    How do fiber optic pressure sensors work?

    In a nutshell? i cannot seem to find a lot of information online about these. Could someone please help? thanks!
  30. C

    Increase the coupling efficiency of fiber

    I learn that increase of the beam size of the laser before coupling it to the fiber can increase the coupling efficiency of it. Can I know why is this so? Maybe the fiber is of very small diameter, and the focal lens in front of the fiber can't focus all the laser to this small diameter...
  31. kandelabr

    Carbon fiber, kevlar pressure vessel design standards

    hi, i can't find any standard defining design of unfired pressure vessels made from carbon fiber, kevlar, fiberglass or similar high tensile strength materials*. do standards like these even exist, since these materials are relatively new? * you know any more similarly competitive materials...
  32. R

    Index of refraction of an optical fiber

    Homework Statement The glass core of an optical fiber has an index of refraction 1.62. The index of refraction of the cladding is 1.47. What is the maximum angle a light ray can make with the wall of the core if it is to remain inside the fiber? Homework Equations theta = sin ^-1...
  33. Topher925

    Is working with fiber optics difficult?

    This isn't really an "engineering" question but I really didn't know where else to ask. I just want to know if any of you out there have experience working with fiber optic wires and how difficult they are to work with. Is there any special equipment involved if you are not going to be splicing...
  34. K

    Designing a Rocket Airframe with Carbon Fiber

    I'm a sophomore Aerospace major, and I'm also a new member to a rocket student group at my university. We are currently involved in a competition with NASA, and they have asked our group to write a Preliminary Design Review. Everything was split up, and I was left with the rocket's airframe...
  35. K

    Fiber optic based beam splitter

    Hi, Does any of you know any commercially available fiber optic - beam splitter? It is very crucial for my experiment where I distribute an electromagnetic beam from one laser source (infrared) to two waveguides.. Since I am coupling using fibers, I require a fiber optic based beam...
  36. W

    Fast And Slow Muscle Fiber Conundrum

    Question 1, WHICH SET WILL PRODUCE MORE, AND MORE OVERALL FORCE FROM THE SLOW MUSCLE FIBERS, THUS IN TURN MORE TENSION TO THEM. A slow set of slow reps 3/3, using 75% of your 1RM, let us call this 100pounds, 6 repetitions = 36 seconds. You fail faster in the faster rep with the same...
  37. O

    Optical Fiber Transfer Function (attenuation and dispersion)

    I have a few questions regarding the transfer function of a SMF. I'm using the below equation to simulate the effect a single mode fiber (SMF) has on the optical field after some distance \textit{z}. \begin{equation} S_{out}(\omega) = S_{in}(\omega)\exp\left...
  38. R

    Fiber Grating Using Finite Difference Method

    Fiber Grating Using Finite Difference Method I have to solve the Fiber grating coupled-equations using FDM. These equations are coupled each other and strange inital conditions. That means ode45 from the MATLAB library function doesn't work here! I am totally fresh in numerical analysis...
  39. Q

    How Do You Calculate Parameters for a Multimode Step Index Fiber?

    Homework Statement A multimode step index fiber has a relative index difference of 1% and a core refractive index of 1.5. The number of modes propagating at a wavelength of 1.3μm is 1100. Estimate the diameter of the fiber core. An optical link of 6 km uses the above fiber. Find (a) the...
  40. S

    Muscle Fiber Contraction and Calcium

    When glycerinated rabbit muscle fiber was placed in 10^-4 M of CaCl2 solution, the percent change in length of the muscle fiber was around 93%. When glycerinated rabbit muscle fiber was placed in 30 mM ATP in 10^-2 M CaCl2 + 0.05 M KCl + 0.001 M MgCl2 solution, the percent change in length of...
  41. N

    Can a CO2 laser be cabled with optical fiber?

    Hi, i have a question about optical fiber and CO2 laser Can a CO2 laser be cabled with optical fiber? Wavelength of 10 micron
  42. P

    Transmitting Images through a Coherent Fiber Bundle

    A coherent fiber bundle is very useful in transmitting images. Let's say we have a gaussian beam from a laser as our source. Now the acceptance angle(2*alpha) is determined from the location of the beam waist, right? The light ray will then go down the fiber core with the use of a converging...
  43. S

    Seeking fiber optics info - power transmission

    Hi, first time poster here. I am a mechanical engineer, and I am looking for information on using fiber optics to transport solar energy. There is a new field called daylighting, that uses solar energy for lighting during daylight hours. It uses a variety of gadgets to do this, and some...
  44. J

    How Can I Increase the Intensity of Light from a Fiber Optic for CCD Imaging?

    I hope this post in the appropriate forum. I have a spectrograph and a CCD imaging chip that I am using for an optics experiment. The light coming into the spectrograph is through a 10 micron fiber optic. In order put the light on the CCD imaging chip the way I want it, I believe I need to...
  45. N

    Max Power for Fiber Connectors?

    Max Power for Fiber Connectors?? Does anyone know the maximum peak or average power for FC/APC fiber optic connectors? My system is constantly burning the cores of these connectors. I have a maximum of 600mW (average) and 1KW (peak) passing through these connectors.
  46. Loren Booda

    Can earthbound fiber optics replace communication satellites?

    With the threat of satellites being blown up, would fiber optics offer a practical alternative for communications or other applications?
  47. J

    Can carbon fiber make a better bulletproof vest?

    Hey all, I wonder if anyone can answer this for me: Why hasn't carbon fiber been used to make better bulletproof vests (ignoring cost)? Doesn't carbon fiber have a higher tensile strength than Kevlar? Isn't it lighter? Also, wouldn't a solid version, of carbon fiber reinforced plastic...
  48. J

    Foliation, fibration, fiber bundle?

    what's the difference among those three objects? Any body can give me some examples? Thanks
  49. C

    Laser through optic fiber - out before through

    looking for information about phenomena when light through fiber out before through and photon reverses at exit time to negate entering photon leading to equilibrium of energy transfer. think it was coated with iridium or something. not sure. saw it reported on shortnews.com about a year or so...
  50. S

    Nylon fiber guitar string sound

    Why does the sound of an old nylon fiber guitar base string on the guitar become suddenly "livelier", or "brighter", after being loosened and then retightened back to its normal tuning?
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