The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We characterize a low-phase-noise Kerr frequency comb for carrying data channels. Results show pump wavelength detuning region grows slightly at higher pump power and the phase noise stays relatively unchanged over pump wavelength detuning region.
Joint polarization-state and phase noise tracking is demonstrated using an unscented Kalman filter. Experimentally this outperforms CMA and extended Kalman filters (EKF) and a less complex modified version outperforms CMA and EKF at higher OSNRs.
We experimentally demonstrate an optical wavelength shifting scheme of 20Gbaud 16QAM based on cascaded 2nd-order nonlinearities in PPLN using coherent pumps, which is free of the phase noise from pumps.
We propose an optically generated pilot tone aided carrier phase recovery scheme in dual-carrier Nyquist-mQAM systems. Both side channels can be compensated using one pilot, providing a high linewidth tolerance with small complexity.
We proposed a method to estimate the laser phase noise using the phase noise to intensity noise conversion based on the direct detection (DD) technique. It is shown by simulation that the estimated results approach when the laser line-width is no larger than 1MHz. Besides, compared with coherent detection -based phase noise estimation, the DD technique provides cost-efficient solutions.
We analyze the phase noise contribution to the photocurrent of the multilevel direct detection receiver based on delay line interferometer (DLI) and balanced photodetector. We show that the phase noise influence in multilevel systems is much stronger compared to that in binary systems as a result of the DLI configuration. The characteristic function of the photocurrent is derived for arbitrary-delay...
With the rebirth of coherent detection, various algorithms have come forth to alleviate phase noise, one of the main impairments for coherent receivers. These algorithms provide stable compensation, however they limit the DSP. With this key issue in mind, Fabry Perot filter based self coherent optical OFDM was analyzed which does not require phase noise compensation reducing the complexity in DSP...
We demonstrate a 10 GHz photonic oscillator based on optical frequency division of a high-stability optical reference with a modelocked fs laser. Characterization with a second independent photonic oscillator reveals a close-to-carrier phase noise that is < 100 dBc/Hz, reducing to a shot noise floor of −156 dBc/Hz at a 1MHz offset.
Since conventional CO-OFDM transmission systems are very sensitive to laser phase noise, we introduce a scheme called pilot-aided phase noise compensation, and verify its capacity to compensate phase noise by simulation. Furthermore, how to choose key parameters of this scheme is investigated in order to direct system design.
We propose a new method for optical frequency comb (OFC) based on cascading intensity modulation. And then by selecting spectral lines of interest from OFC via optical filters, 10GHz, 20GHz sinusoidal signals with low phase noise and several desirable waveforms are generated.
A tuneable terahertz source based on the first hybrid integrated optical phase-lock loop is presented. Generated signals have linewidth <;lkHz and phase noise <;-80 dBc/Hz at 10 kHz offset. The measured output power at 300 GHz was -22 dBm.
112Gb/s transmission is now being considered in next-generation fiber networks worldwide. Optical synchronous coherent detection is attracting greater attention within the proactive military community in order to analyze these high speed transmissions. Coherent detection allows linear recovery both of the amplitude and phase of transmitted optical signals in the post-detector RF domain. Therefore,...
We propose a pilot-tone based phase noise compensation method for the mitigation of nonlinearities in OFDM transmission. This scheme allows for the compensation of XPM-induced transmission impairments without direct knowledge of the optical field of the co-propagating channels.
We demonstrate the first digital laser-phase-noise (PN) mitigation approach for DDO-OFDM which applies a simple Wiener filter for adaptively estimating the statistical-unknown PN. The PN tolerance, in terms of the achievable fibre length, is about tripled with this PN mitigation technique.
An optical regeneration scheme based on non-degenerate phase-sensitive amplification in highly-nonlinear fibers is proposed. The regenerator exhibits significant amplitude and phase noise suppression properties and eliminates the need for precise phase and frequency locking with the input signal.
We present a comprehensive theory on the spectral dependence of nonlinear phase noise in a single-pumped fiber parametric amplifier, which is subsequently validated by stringent simulation.
We estimate asymptotic probabilities of a cycle slip for a non-decision aided feedforward carrier synchronizer in dispersion-uncompensated optical lines with negligible nonlinear crosstalk.
We derive a differential Q factor model for DPSK signals detected by delay line demodulators. The parameters involved in the model are related to signal characteristics such as phase noise linewidth, OSNR and power fluctuations, and can therefore be directly monitored from it. Moreover, its validity is tested and confirmed under various phase noise and amplitude fluctuations scenarios. In addition,...
We propose an optical phase noise extraction and amplification (OPNEA) technique. By applying OPNEA to phase noise monitoring for (D)PSK, 13-dB dynamic range and 0.2-dB/degree sensitivity were achieved with a 50-120-degree phase deviation.
A new topology for a high-Q processor with extremely low phase noise generation is presented. It is based on a frequency-shifting loop. Results show a high-Q response with a large phase noise reduction of 41 dB.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.