Instantaneous microwave frequency measurement with monitoring of system temperature

Poly-harmonic Analysis of Raman and Mandelstam-Brillouin Scatterings and Bragg Reflection Spectra

“…6 was assembled. Setup consists of the laser LDI-DFB 1550-20/50-T2-SM3-FA-CWP, calibration source Superlum SLD Pilot-4, the oscilloscope Agilent InfiniVision 7000, random waveform signal generator AFG3000, multimeter, MZM JDS Uniphase OC-192 Modulator, stabilized power supply PSS-1, the spectrum analyzer FTB 5240-S, an optical splitter, a circulator, FBG, the photodiodes LSIPD-A75 [59]. The spectra of two-frequency laser radiation is shown in Fig.…”

“…The analysis presented in [7], [59] shows that from the electrical output signal we can get the image of the optical transfer function at the beat frequency of the two components of the probing signal, which will be determined by the change of their amplitudes and phases. At the moment when center frequency of a probing signal gets to the resonance frequency of a (22) and (21) made it possible to depict the measurement characteristics for determination of the central frequency of the gain spectrum by its amplitude (Fig.…”

“…So, to reduce the measurement inaccuracy caused by phase fluctuations of system elements new poly-harmonic method was applied, based on a four-frequency narrow-band measurements without the use of phase analysis. The advantage of this approach is the ability of the measurement in a band up to 300 MHz with narrow-band low-noise photo-detector [59].…”

Optoelectronic systems for microwave instantaneous frequency measurement based on amplitude-phase modulation of the optical carrier

“…For the metrological characteristics of the OEM MSIF the following requirements have been formed: the frequency range of up to 40 GHz; the amplitude range of up to 50 dB, the error of about 0.2 GHz. General requirements to the channels monitoring operating modes are determined by the need to use a symmetric dualfrequency radiation to control positions of both the central wavelength of the FBG and the operating point of the amplitude modulators [5]. Both channels should be constructed using for OEM all-purpose elements, including narrow-band photodetectors, in order to avoid the increase in the cost of the system as a whole.…”

Optoelectronic Systems for Radiosignals Instantaneous Frequency Measuring With an Amplitude-Phase Modulation Conversion of Optical Carrier

“…Для метрологических характеристик ОЭС ИМЧР сформированы следующие требования: диапазон по частоте − до 40 ГГц, диапазон по амплитуде − до 50 дБ, погрешность − до ±0,2 ГГц. Общие требования к каналам мониторинга рабочих режимов определяются необходимостью применения симмет-ричного двухчастотного излучения для контроля положения центральной длины волны ВРБ и контроля положения рабочей точки амплитудных модуляторов [18,19]. Оба канала должны быть построены с использованием универсальных для ОЭС элементов, в том числе узкополосных фотоприемников, чтобы не повышать стоимость системы в целом.…”