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Theoretical study of amplified spontaneous emission intensity and bandwidth reduction in polymer

Chinese Physics B 2015年第4期24卷 124-137页

作者： A.Hariri S.Sarikhani Laser and Optics Research School

Amplified spontaneous emission （ASE）, including intensity and bandwidth, in a typical example of BuEH-PPV is calculated. For this purpose, the intensity rate equation is used to explain the reported experimental measurements of a BuEH-PPV sample pumped at different pump intensities from Ip = 0.61 MW/cm2 to 5.2 MW/cm2. Both homogeneously and inhomogeneously broadened transition lines along with a model based on the geometrically dependent gain coefficient （GDGC） are examined and it is confirmed that for the reported measurements the homogeneously broadened line is responsible for the light-matter interaction. The calculation explains the frequency spectrum of the ASE output intensity extracted from the sample at different pump intensities, unsaturated and saturated gain coefficients, and ASE bandwidth reduction along the propagation direction. Both analytical and numerical calculations for verifying the GDGC model are presented in this paper. Although the introduced model has shown its potential for explaining the ASE behavior in a specific sample it can be universally used for the ASE study in different active media.

关键词： amplified spontaneous emission bandwidth reduction polymers gain coefficient

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Derivative Derivative-Based Envelope Design Technique for Wideband Envelope Tracking Power Amplifier with Digital Predistortion

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ZTE Communications 2022年第S1期20卷 22-26页

作者： YI Xueya CHEN Jixin CHEN Peng NING Dongfang YU Chao State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China ZTE Corporation Shenzhen 518057China

A novel envelope design for an envelope tracking(ET)power amplifier(PA)based on its derivatives is proposed,which can trade well off between bandwidth reduc-tion and tracking *** paper theoretically analyzes how to choose an envelope design that can track the original envelope closely and reduce its bandwidth,and then demonstrates an example to validate this *** generalized memory polynomial(GMP)model is applied to compensate for the nonlinearity of ET PA with the proposed envelope *** are carried out on an ET system that is operated with the center fre-quency of 3.5 GHz and excited by a 20 MHz LTE signal,which show that the proposed en-velope design can make a good trade-off between envelope bandwidth and efficiency,and satisfactory linearization performance can be realized.

关键词： bandwidth reduction envelope tracking shaping function supply modulator

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