نتایج جستجو برای: relative intensity noise rin
تعداد نتایج: 737187 فیلتر نتایج به سال:
Pump relative intensity noise (RIN) has been recognized as a major source of noise in mode-locked lasers. The coupling of RIN from the pump to the output of a passively mode-locked fiber laser (PMFL) is systematically investigated using a pump modulation technique. It is found that the linear RIN coupling ratio from pump to PMFL is decreased with an increase in modulation frequency and is indep...
This paper is focused on the Relative Intensity Noise (RIN) aspect of a research project on development of a novel approach for accurate measurement of RIN and Frequency Excursion (Chirp) in Laser Diodes as Transmitters for Optical Communication Networks. The desired metrology capabilities have been developed and demonstrated, providing significantly improved sensitivity and accuracy than exist...
We present a semi-analytic numerical model to estimate the transverse modal instability (TMI) threshold for photonic crystal rod amplifiers. The model includes thermally induced waveguide perturbations in the fiber cross section modeled with finite element simulations, and the relative intensity noise (RIN) of the seed laser, which seeds mode coupling between the fundamental and higher order mo...
In an optical time-division multiplexed (OTDM) network with all-optical routers, system performance, that is, the bit-error rate (BER), is limited by a number of additional noise sources due to the router. In this paper, we investigate the noise contribution due to the crosstalk and relative intensity noise (RIN) within the router, and derive an expression for the BER. We also show that the pow...
Relative intensity noise spectra of weakly index guided VCSELs in a multi{transverse mode regime are analyzed by using a model that takes into account all the transverse modes supported by the waveguide. Several resonance peaks are obtained in the noise spectra that correspond to the relaxation oscillation frequencies of the transverse modes. In is shown that for low spatially overlapping trans...
Measuring and evaluating the quality of laser sources used in optical communications precision measurement system is essential. Relative intensity noise (RIN) a parameter that directly affects quality. Therefore, RIN needs to be measured periodically. This study presents high-sensitivity, broadband (40 GHz) using precisely temperature-controlled photodetector an electrical spectrum signal analy...
A novel, intensity-stabilized, fast-scanned, direct absorption spectroscopy (IS-FS-DAS) instrumentation, based on a distributed feedback (DFB) diode laser, is developed. A fiber-coupled polarization rotator and a fiber-coupled polarizer are used to stabilize the intensity of the laser, which significantly reduces its relative intensity noise (RIN). The influence of white noise is reduced by fas...
A novel high power distributed feedback (DFB) laser is proposed which uses a partially narrow waveguide and corrugation pitch modulated (CPM) phase shift grating. Compared with conventional DFB lasers constant width, these necked have greater improvements in terms of optical relative intensity noise (RIN) spectrum. They are less sensitive to external (EOF) increase the range injection current f...
Kerr effect nonlinearities in optical fibres have been the subject of extensive studies [1 – 3]. Four wave-mixing (FWM) between the signal and the amplified spontaneous emission (ASE) noise was found to be an important source for system performance degradation, especially in systems using in-line optical amplifiers. With positive fibre dispersion, this effect is known as modulation instability ...
In this paper we investigate the noise and crosstalk characteristics of all optical router based on SMZ switch using a numerical model. Two effects, the relative intensity noise (RIN) and channel crosstalk (CXT) that degrade the bit error rate (BER) performance of the router are investigated. Numerical simulation results show that for BER of 10, the sensitivity of the receiver with all-optical ...
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