97 All Rights Reserved © 2012 IJARCSEE Abstract---Use of optical fiber communication is widely use due to its better bit rate and bandwidth and high carrier frequency with low power consumption. So, in this paper, we have analyzed non linear modulation techniques that are self phase modulation (SPM) and cross phase modulation (CPM) in an optical fiber system and discussed how these cause disper...

Detailed analysis of a novel highly linear phase-locked coherent optical demodulator is presented. We investigate how loop gain, phase-modulator non-linearity and amplitude modulation influence the Signal to Interference Ratio (SIR) of the demodulated signal. ©2006 Optical Society of America OCIS codes: (060.1660) Coherent communications; (120.5060) Phase modulation

Pulse Width Modulation (PWM) techniques are commonly used to control the output voltage and current of DC to AC converters. Space Vector Modulation (SVM), of all PWM methods, has attracted attention because of its simplicity and desired properties in digital control of Three-Phase inverters. The main drawback of this PWM technique is &#10its complex and time-consuming computations in real-time ...

Pulse Width Modulation (PWM) techniques are commonly used to control the output voltage and current of DC to AC converters. Space Vector Modulation (SVM), of all PWM methods, has attracted attention because of its simplicity and desired properties in digital control of Three-Phase inverters. The main drawback of this PWM technique is its complex and time-consuming computations in real-time im...

Observers can more easily detect correlated patterns of temporal contrast modulation within hybrid visual images composed of two components when those components are drawn from the same original picture (Blake, R., & Yang, Y. (1997). Proceedings of the National Academy of Science, 94, 7115-7119). To learn whether spatial phase is a mediating variable, we measured thresholds for detection of con...

This work describes several methods to handle oscillator phase noise in single carrier systems operating over AWGN channels. The modulation type used is M -ary PSK (MPSK) with/without differential encoding. The oscillator phase noise is modeled as a Wiener-Lévy process. Data Aided (DA), Non-Data Aided (NDA) and Decision Directed (DD) maximum likelihood estimators are derived and a Pilot Symbol ...

An open-loop, all-fiber-optic gyroscope with wide dynamic range and linear scale factor is described. This novel approach converts the Sagnac phase shift into a phase shift in a low-frequency electronic signal by using optical phase modulation followed by amplitude modulation verify the theoretical predictions.

This paper presents a hybrid modulation technique consisting of singe-reference six-pulsemodulation (SRSPM) for front-end dc/dc converter and 33% modulation for three-phase inverter. Employing proposed novel SRSPM to control front-end dc/dc converter, high frequency (HF) pulsating dc voltage waveform is produced, which is equivalent to six-pulse output at 6× line frequency (rectified 6-pulse ou...

Multilevel cascaded and hybrid inverter systems conventionally use three level bipolar PWM for each individual inverter, with their carriers phase shifted to achieve maximum harmonic cancellation within each phase leg. This has been shown to give a harmonic performance equivalent to APOD modulation of a NPC multilevel inverter, when the switching frequencies are scaled to achieve the same numbe...

—Index modulation, where information bits are conveyed through antenna indices (spatial modulation) and subcar-rier indices (subcarrier index modulation) in addition to information bits conveyed through conventional modulation symbols, is getting increased research attention. In this paper, we introduce precoder index modulation, where information bits are conveyed through the choice of a preco...