This paper investigates the performance limitations due to Relative Noise Intensity (RIN) of long haul direct detection optical single side band systems employing subcarrier multiplexed techniques (OSSB/SCM) using in-line optical amplifiers. The influence of fiber nonlinearity, dispersion and loss on the RIN spectrum at fiber output is quantified and validated by simulation. Our results show th...

The abstract should include: what you are doing; why you are doing it; how you did it (designed using some tool); what are the main results (numbers: at what frequency, what gain, what ripple, ...) and finally what the main contribution and/or conclusion is. Be specific. For example: Abstract—This paper describes the design, implementation and characterization of a high-efficiency 10-GHzThis pa...

This audio quality measurement Application Note is geared towards describing the methods for measurement of key audio specifications. Each analysis technique described here in, can be applied to audio ADCs, DACs, Analog Mixers, or any signal within the audio band. Audio quality is typically gauged by three main components. They are Signal to Noise Ratio, Total Harmonic Distortion, and Frequency...

Two different circuit models of RC coupled small-signal amplifiers are developed using identical power MOSFETs in Darlington pair configuration. Proposed circuits successfully eliminate the poor frequency response problem of Darlington pair amplifiers at higher frequencies. An additional biasing resistance RA, ranging from 1KΩ to 100KΩ, is to be essentially used in the proposed circuits to main...

Introduction: Power amplifiers (PAs) with high power efficiency are inherently nonlinear (NL). The requirements on linearity have increased since wideband signals with high peak-to-average ratios are used more in, e.g. mobile systems. Linearisation is, thus, necessary for high power efficiency of PAs. Digital predistortion (DPD) has attracted much interest since it is a cost-effective linearisa...

The fusion of voice and data applications, along with the demand for high data-rate applications such as video-on-demand, is making radio frequency (RF) spectrum an increasingly expensive commodity for current and future communications. Although bandwidth-efficient digital modulation alleviates part of the problem by requiring a minimal use of spectral resources, they put an extra design burden...

This audio quality measurement Application Note is geared towards describing the methods for measurement of key audio specifications. Each analysis technique described here in, can be applied to audio ADCs, DACs, Analog Mixers, or any signal within the audio band. Audio quality is typically gauged by three main components. They are Signal to Noise Ratio, Total Harmonic Distortion, and Frequency...

As the mobile phone is an essential accessory for everyone nowadays, predistortion for the RF power amplifiers in mobile phone systems becomes more and more popular. Especially, new predistortions for power amplifiers with both nonlinearities and memory effects interest the researchers. In our thesis, novel predistortion techniques are presented for this purpose. Firstly, we improve the digital...

INTRODUCTION: In our previous work on passive current source RF power amplifiers, it was noted that additional inter-element isolation in a parallel transmit coil array was possible when the lengths of the coaxial cables that connected the amplifiers to the coils were reduced [1,2]. In addition, shorter cable lengths also lead to reduced power loss and cost. This can be achieved by placing the ...

Erbium doped fiber amplifiers (EDFA) are most commonly used in optical networks for the most assorted applications. The fast power transient effect of the cascaded erbium-doped fiber amplifiers (EDFA) in 45 channels optical ring network is investigated. The power transient effect of EDFA’s are observed when channels are added and dropped. It is shown that, for low channel adding/dropping freque...