Self-phase modulation - Wikipedia
Self-phase modulation is the nonlinear phase modulation of a beam, caused by its own The simulation has been done with the software RP Fiber Power. It was simulated in PSIM and uses analog multiplexers to generate the modulating . The Spatial Self-phase modulation phenomena which can determine the . To date, many techniques have been developed, but evaluation of the. Very basic simulation, assuming thin sample and instantaneous rensponse (see e.g. Boyd 'Nonlinear Optics' Academic Press ). The self-phase modulation.
Thus, all-optical signal processing techniques are highly desirable to support the necessary optical switching functionalities in future ultrahigh-speed optical packet-switching networks.
To cope with the wide use of optical phase-modulated signals, in the thesis, an all-optical logic for DPSK or PSK input signals is developed, for the first time. Based on four-wave mixing in semiconductor optical amplifier, the structure of the logic gate is simple, compact, and capable of supporting ultrafast operation. In addition to the general logic processing, a simple label recognition scheme, as a specific signal processing function, is proposed for phase-modulated label signals. The proposed scheme can recognize any incoming label pattern according to the local pattern, and is potentially capable of handling variable-length label patterns.
Optical access network with multicast overlay and centralized light sources.
phase modulation xpm: Topics by stihotvorenia.info
In the arena of optical access networks, wavelength division multiplexing passive optical network WDM-PON is a promising technology to deliver high-speed data traffic. However, most of proposed WDM-PONs only support conventional point-to-point service, and cannot meet the requirement of increasing demand on broadcast and multicast service. In this thesis, a simple network upgrade is proposed based on the traditional PON architecture to support both point-to-point and multicast service.Phase Modulation (Basics, Definition and Waveform) [HD]
In addition, the two service signals are modulated on the same lightwave carrier. The upstream signal is also remodulated on the same carrier at the optical network unit, which can significantly relax the requirement on wavelength management at the network unit. Self-phase modulation SPM is the principal mechanism responsible for the generation of picosecond and femtosecond white-light supercontinua.
After you have modified some inputs, click the "calc" button to recalculate the output. The time-dependent phase change caused by SPM is associated with a modification of the optical spectrum.
If the pulse is initially unchirped or up-chirped, SPM leads to spectral broadening an increase in optical bandwidthwhereas spectral compression can result if the initial pulse is downchirped always assuming a positive nonlinear index. The reason for the oscillatory character is essentially that the instantaneous frequency undergoes strong excursions, so that in general there are contributions from two different times to the Fourier integral for a given frequency component.
- Self-phase Modulation
Depending on the exact frequency, these contributions may constructively add up or cancel each other see also Ref. The simulation has been done with the software RP Fiber Power. In optical fibersSPM can be the dominant effect on an ultrashort pulse if the peak power is high leading to strong SPM while the chromatic dispersion is weak, so that the pulse duration remains approximately constant. Thereafter, it grows faster because anomalous dispersion leads to pulse compression and thus to an enhanced nonlinear interaction.
The numerical simulation which takes into account chromatic dispersion, SPM, self-steepening and stimulated Raman scattering has been done with the RP Fiber Power software. In optical fibers with anomalous chromatic dispersionthe chirp from self-phase modulation may be compensated by dispersion; this can lead to the formation of solitons.
In the case of fundamental solitons in a lossless fiber, the spectral width of the pulses stays constant during propagation, despite the SPM effect.