Showing papers on "Dispersion-shifted fiber published in 1969"

or Optical Fiber

Abstract: An optical ber consists of cylindrical dielectric material surrounded by another cylindrical dielectric material with a lower index of refraction. Figure 1.1 shows that the transistion between the core and the cladding region can either be a discrete transistion (Step Index) or a gradual transistion (Graded Index). n 1 n 2 n 2 step index graded index index index a a n 1 Figure 1.1: End cross-section of an optical ber. First let's look and the step index optical ber, where the core has an index of refaction of n 1 and the cladding has an index of n 2 , where n 1 > n 2. We will initial look at the light traveling in the optical ber as a propagating ray. Even those this is not technically accurate, it provides some intuitive feel for what is going on. Figure 1.2 shows a cross-sectional view of a step index optical ber. If the propagation angle is greater than the critical angle then the ray will bounce of the surface and will be connned to the core region.

Fiber for distortion-free propagation

Abstract: A fiber for use in the propagation of light pulses with the attendant elimination of distortion. The fiber is useful as a delay line storage device for computer information with an extremely high-packing density capability for the bits of information. Another application is in a broadband communication system as a transmission line and in any application the fiber may be ''''active'''' as either a laser amplifier or oscillator. Basically, the invention involves the choice of fiber core and cladding size and other parameters to counteract, with the anomalous dispersion associated with the waveguide transmission, the normal dispersion of the bulk glass from which the fiber is made. The pulses of light are thereby propagated undistorted since the various frequency components within the light pulse are propagated with an effective velocity which is independent of wavelength in the spectral interval of the pulse.