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.
”McGurk effect” is known as an auditory illusion caused by interference from unmatched visual inputs. For example, a combination of auditory/Pa/ and visual/Ka/ results in the perception of a third syllable of/Ta/. Recent neuroimaging studies proposed that left posterior superior temporal sulcus (pSTS), a hub region of audiovisual integration, is concerned with McGurk effect. However, the mechanisms...
3×ONU coherent OFDMA-PON uplink transmission is demonstrated using a 3 Gbaud realtime IFDMA transmitter. The digital remote laser synchronization technique enables no-guard-band subcarrier multiplexing with free-running ∼100 kHz linewidth sources over a 40 km SMF link.
We investigated experimentally the transmission performance of 100 Gbps dual-carrier DP-BPSK signals transmitted on a 3,080 km in-line chromatic dispersion compensated fiber link with real-time digital signal processing. Its doubled phase margin and nonlinear noise squeezing achieved 2 dB greater robustness to fiber nonlinearity effects compared to single-carrier DP-QPSK signal.
DSP-enabled remote carrier synchronization technique for coherent OFDMA-based PONs is investigated by using 12Gsps real-time IFDMA-PON transmitter prototype with a 3kHz linewidth free-running source.
We propose a novel nonlinearity mitigation technique which can double the spectral efficiency of a phase-conjugate twin wave by diplexing the twin waves. Simulation shows a Q improvement of 1.2 dB from conventional DP-QPSK transmission.
We discuss the concept of combination of nonlinearity equalizer and soft-decision FEC decoder. The appropriate choice of equalization performance and error correcting capability of FEC is essential for performance optimization with existing nonlinear phase noise.
We present a novel bandwidth-elastic and power-efficient coherent NG-PON based on coherent interleaved frequency division multiple access (IFDMA) and experimentally demonstrate the 2xONUs uplink transmission, exhibiting capabilities of the elastic bandwidth provisioning and CFO compensation.
We propose a novel SD-FEC employing the concatenation of a spatially-coupled type irregular LDPC code with a BCH code. Numerical simulations show an NCG of 12.0 dB at a BER of 10-15 with 25.5% redundancy.
The performance and feasibility of rate-adaptive FEC is studied by means of an OTU framing structure. When ODTU tributary slots are utilized to transmit parity, the assignment of up to 23 slots is feasible.
The distortion of coherent signals caused by nonlinear effects were studied experimentally using a real time DSP at 40 Gbps. It was shown that coherent signals were primarily degraded by SPM in the case of a 50 GHz ROADM grid. The XPM-induced penalty increased on reducing the channel spacing to 25 GHz.
This paper presents the effectiveness of high order phase noise compensation by off-line experiment which shows the scheme can reduce the pilot tone density to 25% or improve the EVM by 0.25dB for 16QAM OFDM.
We propose a novel hard-decision FEC based on an unequal error protection (UEP) BCH product code for OTU4 framers. A simulation indicates a net coding gain of 9.35dB with 7% redundancy.
Novel feed-forward polarization tracking is proposed using differential detection of the X and Y polarizations. An experiment showed that the proposed method mitigated 2.6 dB penalty caused by 10 MHz polarization rotation for 43G DP-QPSK.
An LDPC based soft-decision FEC having a NCG of 10.8dB has been implemented in a coherent ASIC. Greater gain and the interplay with nonlinearity equalizers are anticipated for the real deployment of 100G and beyond.
We propose 25 Gbps optical link for uncompressed ultra-high-definition-television streaming and demonstrate it over 3 km single mode fiber employing low-cost and compact optical transmitter and receiver set.
We discuss the practical implementation of LDPC codes in soft-decision FEC for 100 Gb/s digital coherent systems. The question of the definition of net coding gain for differential QPSK used to avoid cycle slip is raised.
Dispersion compensation fiber is one of the causes of transmission delay in optical systems. We demonstrate a low-latency model system employing electronic pre-equalization. The pre-equalization technology saves 1.145 ms of latency over 3,900 km.
A high-speed DAC for optical communications is introduced. To achieve a DAC suitable for digital signal processor based high order modulation, an interleaved DAC and a highspeed multiplexer become key technologies.
We have developed a 2-bit 32 GS/s soft decision LSI in 0.13 μm SiGe-BiCMOS. The LSI includes a flash type Analogue-to-Digital converter and an encoder which outputs the soft decision results, which are a hard decision bit and a confidence bit for strong Forward Error Correction. We have confirmed that the LSI has 25 mVpp sensitivity and the LSI enables 2 dB better FEC coding gain than hard decision.
Electronic pre-equalization of chromatic dispersion for 43 Gb/s DQPSK has been demonstrated employing a developed test chip. The chip enables the BER in fibre with 2450 ps/nm of dispersion to be improved to 7.6E-05 without an optical dispersion compensator.
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.