Publication

Longitudinal spatial hole burning and associated nonlinear gain in gain-clamped semiconductor optical amplifiers

Benoît Marie Joseph Deveaud, Marc-André Dupertuis, Stefan Haacke
1998
Journal Articles

Abstract

The longitudinal spatial hole burning (LSHB) in gain-clamped semiconductor optical amplifiers (GCSOA's) is investigated by means of a numerical model, which is based on position-dependent rate equations for the carrier density and the propagation equations for the optical power, The simulation results show that the carrier densities are nonuniformly distributed within the active layer of GCSOA's, The nonuniformity can be large, especially for high currents and optical signal powers near the saturation. It is found that the LSHB induces a gain nonlinearity, which causes interchannel cross talk when GCSOA's are used in wavelength division multiplexing (WDM) applications. In order to reduce this gain nonlinearity, two methods are analyzed: the use of low resistivity devices and the use of unbalanced Bragg mirror reflectivities.

Official source

https://infoscience.epfl.ch/entities/publication/6d4721f7-08c4-456a-a83b-864d2b5465d4

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Benoît Marie Joseph Deveaud, Marc-André Dupertuis, Stefan Haacke
1998
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6d4721f7-08c4-456a-a83b-864d2b5465d4

About this result

Related concepts (32)

Optical amplifier

An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Optical amplifiers are important in optical communication and laser physics. They are used as optical repeaters in the long distance fiberoptic cables which carry much of the world's telecommunication links.

Nonlinear optics

Nonlinear optics (NLO) is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the polarization density P responds non-linearly to the electric field E of the light. The non-linearity is typically observed only at very high light intensities (when the electric field of the light is >108 V/m and thus comparable to the atomic electric field of ~1011 V/m) such as those provided by lasers. Above the Schwinger limit, the vacuum itself is expected to become nonlinear.

Charge density

In electromagnetism, charge density is the amount of electric charge per unit length, surface area, or volume. Volume charge density (symbolized by the Greek letter ρ) is the quantity of charge per unit volume, measured in the SI system in coulombs per cubic meter (C⋅m−3), at any point in a volume. Surface charge density (σ) is the quantity of charge per unit area, measured in coulombs per square meter (C⋅m−2), at any point on a surface charge distribution on a two dimensional surface.

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Longitudinal spatial hole burning and associated nonlinear gain in gain-clamped semiconductor optical amplifiers

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