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Frequency tuning in a self-excited oscillator with a fiber-optic delay line
Abstract
A theoretical analysis is carried out of frequency tuning in a self-excited oscillator with a composite fiber-optic delay line, containing two multimode fiber lightguides and a lightguide mode selector. A procedure is proposed for calculating the oscillation frequency when the selector parameters are varied. Results of an experimental investigation of such a self-excited oscillator are presented.
... The first studies of the opto-electronic generator date back to 1984-1990 [1][2][3][4][5][6][7][8][9][10] In these studies [1][2][3][4][5][6][7][8], OEO with direct modulation of a laser diode at frequencies of 30-60 MHz was experimentally investigated. The first name of the optoelectronic generator is a laser self-oscillator with a fiber-optic delay line. ...
... The first studies of the opto-electronic generator date back to 1984-1990 [1][2][3][4][5][6][7][8][9][10] In these studies [1][2][3][4][5][6][7][8], OEO with direct modulation of a laser diode at frequencies of 30-60 MHz was experimentally investigated. The first name of the optoelectronic generator is a laser self-oscillator with a fiber-optic delay line. ...
... In essence, the construction was represented by an interferometer covered by feedback. In [4,5], the transmission coefficients of a single multi-mode fiber and a fiber-optic delay line formed by two optical fibers of different lengths were investigated. The influence of the modal composition of the optical fiber and the degree of excitation of various optical fibers of different lengths included in the OEO was studied. ...
The history of the creation and research of the "Optoelectronic generator, OEO" in the USSR and Russia is described. References of publications, articles and patents are given for the period 1985-2012.
Taking into account the above publications, it can be said with certainty that the "Quantum Group" of researchers in Moscow power engineering institute (TU) (MPEI) and The Institute of Radio Engineering and Electronics (IRE) have made a significant contribution to the development of the "Optoelectronic oscillator" from 1984 to the present, "OEO", and methods for generating radio-frequency oscillations based on opto-electronic methods.
... In these studies [4][5][6][7][8][9][10][11][12] Optoelectronic oscillator OEO with direct modulation of a laser diode at frequencies of 30-60 MHz was experimentally investigated. The first name of the optoelectronic oscillator was a Laser Self-Oscillator with a fiber-optic delay line (S-O FODL). ...
... A number of patents for the invention of the USSR were obtained for the OEO samples studied. One of them is mentioned in the list of publications [8]. ...
In 2018, the anniversary is celebrated -110 anniversary of his birth of outstanding scientist and Academician Kotelnikov Vladimir A.. The organization The Institute of Radio Engineering and Electronics (IRE) led by Kotelnikov created innovative developments that were ahead of time. One of that invetation is the creation and study of "Opto-electronic oscillator" or OEO. In this article references are given to the main works of scientists in the period 1985-2015. Kotelnikov Vladimir A. headed IRE and was a graduate of the Radio engineering faculty of Moscow power engineering institute (TU) (MPEI). It was the joint group of scientists from MPEI and IRE that conducted pioneering work on the study of the first models of OEO.Taking into account the above publications, it can be said with certainty that the "Quantum Group" of researchers in Moscow power engineering institute (TU) (MPEI) of the Radio engineering faculty and The Institute of Radio Engineering and Electronics (IRE) have made a significant contribution to the development of the "Optoelectronic oscillator" from 1984 to the present, "OEO", and methods for generating radio-frequency oscillations based on opto-electronic methods.
... in IRE was Prof. Doctor of Physics-Mathematics Science,V.V. Grigor'yants. In these studies [1][2][3][4][5][6][7][8] Optoelectronic oscillator OEO with direct modulation of a laser diode at frequencies of 30-60 MHz was experimentally investigated. The first name of the optoelectronic oscillator was a Laser Self-Oscillator with a fiber-optic delay line (S-O FODL). ...
... In [4,5], the transmission coefficients of a single multi-mode fiber and a fiber-optic delay line formed by two optical fibers of different lengths were investigated. The influence of the modal composition of the optical fiber and the degree of excitation of various optical fibers of different lengths included in the OEO was studied. ...
The history of the creation and research of the "Optoelectronic oscillator, OEO" in the USSR and Russia is described. References of publications, articles and patents are given for the period 1985-2012. Taking into account the above publications, it can be said with certainty that the "Quantum Group" of researchers in Moscow power engineering institute (TU) (MPEI) and The Institute of Radioengineering and Electronics (IRE) have made a significant contribution to the development of the "Optoelectronic oscillator" from 1984 to the present, "OEO", and methods for generating radio-frequency oscillations based on opto-electronic methods. Optoelectronic oscillator refers to devices using quantum light generators-lasers. The OEO circuit consists of a laser (or laser diode) with modulator of light radiation , an optical fiber, a photo-detector (based on a photo-diode), a nonlinear electronic amplifier and a frequency selective element(a radio-frequency filter), and a coupler, which are serially closed in the feedback ring. Optoelectronic oscillator OEO circuits by the principle of modulation can be divided into two classes: 1. OEO with direct internal modulation of the laser diode pump current, 2. OEO with external modulation of optical radiation from a laser or laser diode-with an acousto-optical modulator,-with electro-optical modulator, with a modulator based on the Mach-Zehnder interferometer. The first studies of the Optoelectronic oscillator date back to 1984-1990 [1-10].
... in IRE was Prof. Doctor of Physics-Mathematics Science,V.V. Grigor'yants. In these studies [1][2][3][4][5][6][7][8] Optoelectronic oscillator OEO with direct modulation of a laser diode at frequencies of 30-60 MHz was experimentally investigated. The first name of the optoelectronic oscillator was a Laser Self-Oscillator with a fiber-optic delay line (S-O FODL). ...
... In [4,5], the transmission coefficients of a single multi-mode fiber and a fiber-optic delay line formed by two optical fibers of different lengths were investigated. The influence of the modal composition of the optical fiber and the degree of excitation of various optical fibers of different lengths included in the OEO was studied. ...
... As a delay line, a fiber optic system was used [3,4]. The results obtained in general are in good agreement with the theoretical ones. ...
In a radio-impulse self-oscillator (RIA), the initial phases of the pulse oscillations of which are determined by noise processes, the vibration spectrum is noise. If the initial phases of the oscillations are given by a regular external or intrinsic action, then the RIA oscillation spectrum consists of the fundamental-frequency component and the set of lateral, spaced from the fundamental frequency, by a multiple of the modulation frequencies. In this case, there is a coherence of radio pulses. From the coherent modes (CR) of radio pulsed auto oscillators, the mode of radio pulse frequency multiplication is more common. Less well known mode is over synchronization. In this mode, the synchronization band of the radio pulse generator significantly exceeds the synchronization band of the self-excited pulse mode. The coherent regimes considered below were not investigated before. With the appearance of fiber-optic delay lines and opto-electronic oscillators, the possibilities of implementing radio pulse oscillators [1-2]. 1-st mode. The coherent mode can be realized in RIA without external influence if at the initial moment of formation of the next radio pulse in the oscillatory system of the oscillator continue to exist oscillations of the previous radio pulse exceeding the noise level. These residual oscillations will be initial for the newly formed radio impulse. It can be shown that for the origin of the coherent regime under consideration it is necessary to satisfy the inequality К>N, (1) where N is the pulse duty factor, K is the coefficient characterizing the self-excitation RIA margin within the active part of the pulse oscillation cycle. If condition (1) is not satisfied, but the traditional, easier than (1) self-excitation condition for vibrations inside the pulse is satisfied, then the RIA oscillation spectrum will be noise, since in this case the oscillations have time to decay to the start of each next pulse. 2nd mode. We will discuss in more detail the coherent regime, a possible system of interrelated RIA. We will assume that the pulsed mode of the RIA is realized by means of a pulsed supply. For each i-th RIA ensemble pulsed power is supplied with a time delay T i-1 with respect to the supply pulses (i-1)-th RIA. The repetition period of the supply pulses is equal to T. The power pulses of the 1st RIA are shifted relative to the supply pulses of the nth RIA for a time Т n. The duration of the power pulses is such that the radio pulses of two neighboring RIAs partially overlap and the phasing of the oscillations at the initial stage of the development of the
This chapter is devoted to the reader acquaintance with the optoelectronic oscillator theme. We discuss the operation principle of this comparably new source of microwave and mm-wave precision oscillations, which is initially studied a little. Features, advantages and shortcomings of these oscillators are described for two types of optical emission modulations: the direct modulation and the external modulation with the special modulators. Possible applications of optoelectronic oscillators are discussed in brief with an emphasis to complexities of analysis and design of such systems.
Article is devoted the decision to an actual problem of radio physics-to creation of the low noise oscillator of the microwave of a range with limiting characteristics of spectral density of capacity of phase noise at offset 1-10 кHz. The work purpose is definition of radio-frequency spectral density of amplitude and phase noise the optoelectronic oscillator OEO and dependences of amplitude and phase noise on width of a spectral line of radiation and power of optical radiation of the laser. In article theoretical and experimental studying of the low noise laser optoelectronic oscillator (OEO) with not dispersive and dispersive fiber-optical line of a delay as systems of two oscillators of optical and radio-frequency ranges is spent. The main features the OEO are considered: suppression of phase noise in system fiber optic delay line , influence on phase noise of width of a spectral line of radiation of the laser , optical capacity of the laser and delay size in fiber optic delay line. Influence of dispersion fiber optic delay line on a spectrum of a radio-frequency signal the OEO is analysed. It is shown that the optoelectronic oscillator OEO is the radio-frequency oscillator with ultralow level of spectral density of phase noise (level-170dBc/Hz on frequency of generation 10 GHz at offset 1 кHz). Reference: 1. V.V., Grigor'yants, YU.B. Il'in «Laser optical fiber heterodyne interferometer with frequency indicating of the phase shift of a light signal in an optical waveguide». Optical and quantum electronics,№ 21, p.423-427,(1989). 2. A.A. Bortsov , V.V. Grigor'yants, Y.B. Il'in «Effect of the lightguide excitation efficiency on the frequency of a self-excited oscillator with a differential fiber optic delay line»
Статья посвящена решению актуальной проблемы радиофизики - созданию малошумящего генератора СВЧ диапазона с предельными характеристиками спектральной плотности мощности фазового шума при смещении 1- 10 кГц. Цель работы - определение радиочастотной спектральной плотности амплитудных и фазовых шумов оптоэлектронного осциллятора OEO и зависимости амплитудного и фазового шума от ширины спектральной линии излучения и мощности оптического излучения лазера. В статье проведено теоретическое и экспериментальное исследование малошумящего лазерного оптоэлектронного генератора (OEO) с недисперсионной и дисперсионной волоконно-оптической линией задержки как системы двух осцилляторов оптического и радиочастотного диапазонов. Рассматриваются основные особенности OEO: подавление фазового шума в линии волоконно-оптической линии связи, влияние на фазовый шум ширины спектральной линии излучения лазера, оптическая емкость лазера и размер задержки в линии волоконно-оптической задержки. Проанализировано влияние дисперсионной линии оптической задержки на спектр радиочастотного сигнала OEO. Показано, что оптоэлектронный генератор OEO представляет собой радиочастотный генератор со сверхнизким уровнем спектральной плотности фазового шума (уровень 170dBc / Гц на частоте генерации 10 ГГц при смещении 1 кГц).
In article theoretical and experimental studying of the low noise laser oscillator (OEO) with not dispersive and dispersive fiber-optical line of a delay as systems of two oscillators of optical and radio-frequency ranges is spent. The main features the OEO are considered: suppression of phase noise in system fiber optic delay line , influence on phase noise of width of a spectral line of radiation of the laser of a rating, optical capacity of the laser and delay size in fiber optic delay line. Index terms: the opto-electronic oscillator, the OEO, the phase noise, the laser oscillator, a fiber optical path.
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