Publication

Intensity modulation in two Mach-Zehnder interferometers using plasma dispersion in silicon-on-insulator

Luc Thévenaz, Paolo Giuseppe Dainesi
2001
Journal Articles

Abstract

Two Mach-Zehnder interferometers (MZI), one with Y-junction-couplers and the other with multimode interference (MMI), were presented. Both MZI were developed in silicon-on-insulator (SOI) technology and used plasma dispersion effect for light phase modulation. Fiber-to-fiber insertion losses, absorption coefficients, optical coefficients modulated intensities as function of time and modulation extinction ratios versus signal frequencies were measured for these devices at various wavelengths. Both devices were found to be modulated up to a frequency of 3.5 MHz. Insertion losses at wavelengths equal to 1.3 μm were less than 9.5 dB and excess losses relative to a straight waveguide were less than 2.3 dB.

Official source

https://infoscience.epfl.ch/entities/publication/86fda7d1-3f8d-4ec0-92ee-3a928e7fbc57

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Luc Thévenaz, Paolo Giuseppe Dainesi
2001
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/86fda7d1-3f8d-4ec0-92ee-3a928e7fbc57

About this result

Related concepts (32)

Self-phase modulation

Self-phase modulation (SPM) is a nonlinear optical effect of light–matter interaction. An ultrashort pulse of light, when travelling in a medium, will induce a varying refractive index of the medium due to the optical Kerr effect. This variation in refractive index will produce a phase shift in the pulse, leading to a change of the pulse's frequency spectrum. Self-phase modulation is an important effect in optical systems that use short, intense pulses of light, such as lasers and optical fiber communications systems.

Dispersion (optics)

In optics and in wave propagation in general, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency; sometimes the term chromatic dispersion is used for specificity to optics in particular. A medium having this common property may be termed a dispersive medium (plural dispersive media). Although the term is used in the field of optics to describe light and other electromagnetic waves, dispersion in the same sense can apply to any sort of wave motion such as acoustic dispersion in the case of sound and seismic waves, and in gravity waves (ocean waves).

Dispersion relation

In the physical sciences and electrical engineering, dispersion relations describe the effect of dispersion on the properties of waves in a medium. A dispersion relation relates the wavelength or wavenumber of a wave to its frequency. Given the dispersion relation, one can calculate the frequency-dependent phase velocity and group velocity of each sinusoidal component of a wave in the medium, as a function of frequency.