نتایج جستجو برای: phase noise reduction
تعداد نتایج: 1222541 فیلتر نتایج به سال:
Noise reduction in a multiwavelength distributed Bragg reflector fiber laser was demonstrated. A 20 dB reduction of in-phase intensity noise was achieved by using negative feedback to modulate the drive current of the laser pump diode. Strategies for reducing antiphase noise components are discussed.
We report an experimental demonstration of a heterodyne polarization rotation measurement with a noise floor 4.8 dB below the optical shot noise by use of classically phase-locked quantum twin beams emitted above threshold by an ultrastable type II Na:KTP cw optical parametric oscillator. We believe that this is the largest noise reduction achieved to date in optical phase-difference measurements.
This paper proposes a speech processing system based on a model of the human auditory system and a noise reduction neural network with fast Fourier transform (FFT) amplitude and phase spectrums for noise reduction under background noise environments. The proposed system reduces noise signals by using the proposed neural network based on FFT amplitude spectrums and phase spectrums, then implemen...
this article presents a new subspace-based technique for reducing the noise ofsignals in time-series. in the proposed approach, the signal is initially representedas a data matrix. then using singular value decomposition (svd), noisy datamatrix is divided into signal subspace and noise subspace. in this subspace division,each derivative of the singular values with respect to rank order is used ...
Transmission loss and noise reduction of reactive mufflers are determined by linear acoustic theory and unsteady flow field study, respectively. The effects of extending the inlet tube of the muffler, adding holes to the extension, and the number of holes on both transmission loss and noise reduction are investigated. In noise reduction analysis, the Navier-Stokes equations and k-ε model are us...
We demonstrate an all-optical phase noise mitigation scheme based on the generation, delay, and coherent summation of higher order signal harmonics. The signal, its third-order harmonic, and their corresponding delayed variant conjugates create a staircase phase-transfer function that quantizes the phase of quadrature-phase-shift-keying (QPSK) signal to mitigate phase noise. The signal and the ...
We experimentally demonstrate {0.6 dB of photocurrent noise reduction below the shot-noise limit ({1.4 dB without losses) in a phase-sensitive ampliier (nonlinear Sagnac interferometer) using two orthogonally polarized pulses to cancel the GAWBS noise.
در این تحقیق، چالش های موجود در طراحی اسیلاتورهای یکپارچه، علت استفاده از روش های هوشمند، شماری از روش های هوشمند بکارگرفته تاکنون و راهکارهای هوشمند در طراحی و بهینه سازی اسیلاتورهای یکپارچه ارائه شده است. در ادامه یک ابزار طراحی به کمک رایانه (cad tool) با بکارگیری الگوریتم جستجوی هارمونی (hs) در محیط متلب (matlab) با استفاده از تحلیل تعادل هارمونیک (harmonic balance) در شبیه سازی اچ اسپایس آ...
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