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Passive Fibers

Definition: optical fibers without laser-active dopants in the fiber core

More general term: optical fibers

More specific terms: step-index fibers, graded-index fibers, polarization-maintaining fibers, silica fibers, fluoride fibers, mid-infrared fibers, single-crystal fibers, plastic optical fibers, dispersion-shifted fibers, dispersion-decreasing fibers, photonic crystal fibers, photonic bandgap fibers, hollow-core fibers, nanofibers, single-mode fibers, single-polarization fibers, few-mode fibers, multimode fibers, large-core fibers, large mode area fibers, tapered fibers, telecom fibers, specialty fibers

Opposite term: active fibers

German: passive Fasern

Category: fiber optics and waveguidesfiber optics and waveguides


Cite the article using its DOI: https://doi.org/10.61835/qie

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Passive fibers are optical fibers without laser-active dopants in the fiber core. That usually implies that they can only passively transmit light, with some propagation losses are without amplification of the optical power. In some cases, however, nonlinear amplification mechanisms based on stimulated Raman scattering or the Kerr nonlinearity occur.

Passive fibers can be separated into many specific categories:

Compared with active fibers, passive fibers generally exhibit lower propagation losses and are available at lower cost.

Fibers may be equipped with fiber connectors and protective materials to form fiber cables.


tutorial passive fiber optics

Passive Fiber Optics

This is a comprehensive introduction to fiber optics, focusing on passive (non-amplifying) fibers. It explains basic principles as well as practical aspects.

case study multimode fibers

Case Studies

Case Study: Mode Structure of a Multimode Fiber

We explore various properties of guided modes of multimode fibers. We also test how the mode structure of such a fiber reacts to certain changes of the index profile, e.g. to smoothening of the index step.

case study fiber dispersion engineering

Case Studies

Case Study: Dispersion Engineering for Telecom Fibers

We explore different ways of optimizing refractive index profile for specific chromatic dispersion properties of telecom fibers, resulting in dispersion-shifted or dispersion-flattened fibers. This also involves automatic optimizations.

case study pulse compression

Case Studies

Case Study: Nonlinear Pulse Compression in a Fiber

We explore how we can spectrally broaden light pulses by self-phase modulation in a fiber and subsequently compress the pulses using a dispersive element. A substantial reduction in pulse duration by more than an order of magnitude is easily achieved, while the pulse quality is often not ideal.

case study soliton experiments

Case Studies

Case Study: Numerical Experiments With Soliton Pulses in Fibers

We investigate various details of soliton pulse propagation in passive fibers, using numerical simulations.

case study soliton collision

Case Studies

Case Study: Collision of Soliton Pulses in a Fiber

We let two soliton pulses collide in a fiber. Surprisingly, they survive such collisions, even if we involve solitons of higher order.

case study soliton self-frequency shift

Case Studies

Case Study: Soliton Self-frequency Shift in Glass Fibers

We numerically simulate the soliton self-frequency shift, which is caused by stimulated Raman scattering. Influences like higher-order dispersion are found to be quite relevant.

case study solitons in fiber amplifier

Case Studies

Case Study: Soliton Pulses in a Fiber Amplifier

We investigate to which extent soliton pulses could be amplified in a fiber amplifier, preserving the soliton shape and compressing the pulses temporally.

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