The performance of a high-speed intensity-modulation (IM)/direct-detection (DD) transmission system could be limited by the bandwidth optical transceivers. One popular way to cope with this limitation is utilize maximum likelihood sequence estimation (MLSE) at receiver. However, practical problem MLSE its high implementation complexity. Even though channel impulse response can truncated using two-tap filter before applying MLSE, it still faces an when used for multi-level modulation formats....

The performance of high-speed intensity-modulation (IM)/direct-detection (DD) system implemented by using O-band directly modulated laser (DML) could be limited the waveform distortions induced nonlinear modulation dynamics DML. conventional polynomial equalizer (PNLE) can used at receiver to compensate for such distortions. However, this suffers from high implementation complexity. In letter, we propose equalizers based on absolute operation IM/DD We replace square in PNLE with lower...

The dual modulation transmitter, where both the directly modulated laser (DML) and electro-absorption modulator (EAM) are modulated, has attracted considerable attention due to its monolithic integration high output power. This transmitter is capable of manipulating optical intensity phase independently since DML EAM serve mainly as modulators, respectively. Thus, scheme been used generate single sideband (SSB) signals. However, a lack workable model applicable frequency (e.g., >10 GHz),...

The intensity-modulation/direct-detection transmission system operating in the C-band suffers from nonlinear waveform distortions induced by fiber chromatic dispersion due to square-law detection. Volterra equalizers (VNLEs) can be used at receiver compensate for such distortions. However, major concern about is their huge implementation complexity. In this paper, we propose and demonstrate a low-complexity equalizer based on absolute operation cost-sensitive IM/DD system. equalizer,...

We investigate the capacity-achieving symbol distributions for directly modulated laser (DML) and direct-detection (DD) systems utilizing probabilistic constellation shaped pulse amplitude modulation formats. DML-DD utilize a bias tee to feed DC current AC-coupled signals. Also, an electrical amplifier is commonly utilized drive laser. Thus, most are subject constraints of average optical power peak amplitude. compute channel capacity under these by using Blahut-Arimoto algorithm obtain...

In this letter, we propose a novel signal detection method for spatially multiplexed multiple input output (MIMO) systems, based on the idea of ordered successive interference cancellation (OSIC). proposed method, try every possible value as first detected symbol instead making decision. Although requires slightly increased complexity compared to conventional OSIC, eliminates error propagation from symbol, so it offers significantly better performance OSIC. We compare with previous ML,...

Thermal analysis of an <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</i> -band 60-kW (continuous-wave) double-ring strapped magnetron for optimizing the design a cathode support structure and cooling system is presented. This consists oxygen-free copper anode with ten built-in channels directly heated tungsten cathode. The operating temperature greater than 2000°C; therefore, proper thermal essential reliable operation. heat convection...

The operating characteristics of the 100GHz linear magnetron employing reentrant resonator are investigated by using a two-dimensional particle-in-cell simulation. geometrical parameters calculated for operation frequency confirmed resonant modes and field distribution obtained an electromagnetic With synchronism condition, effect number vane beam voltage on power density examined. When 2kV external magnetic 0.79T used, is oscillated at about 100.2GHz, maximum with injected current 60A∕cm2...

We experimentally demonstrate the transmission of 36-Gbaud probabilistically-shaped PAM-8 signal over 10-km link. The performance measured after FEC decoding and inverse distribution matcher shows that receiver sensitivity is improved by &gt;1 dB compared to uniform-distributed signals.

We experimentally demonstrate the direct detection of 40-Gb/s OFDM signal generated by using an electro-absorption modulated laser after transmission over 80-km standard single-mode fiber Kramers-Kronig receiver.

There have been substantial efforts to implement high-speed (>10 Gb/s) upstream transmission using reflective semiconductor optical amplifiers (RSOAs) in a coherent wavelength-division-multiplexed (WDM) passive network (PON). In such network, it is necessary estimate the carrier phase of signal retrieve phase-modulated information created by RSOA. However, due severe waveform distortions caused limited modulation bandwidth RSOA (typically less than 3 GHz), previously reported estimation...

We experimentally demonstrate the 60-km transmission of 28-Gb/s QPSK signal in RSOA-based coherent WDM-PON system. suppress SBS by dithering seed light's frequency and erasing dithering-tone-induced phase fluctuation for carrier estimation.

We experimentally demonstrate the 60-km transmission of 28-Gb/s QPSK signal in RSOA-based coherent WDM PON. The frequency dithering seed laser and fast carrier phase estimator are employed to suppress SBS track laser's phase, respectively.

This paper presents practical time synchronization algorithm for mobile channel in wireless orthogonal frequency division multiplexing (OFDM) system such as 3G-LTE [1]. We first analyze the method of general OFDM systems. The analysis will show that calculated value is unstable and inadequate. instability generated by variation multipath which max power path changed with time. how proposed reduces Results simulation improve tracking performance considerably. Consequently demodulation also...

This paper presents automatic gain control (AGC) algorithm in wireless orthogonal frequency division multiplexing (OFDM) system using carrier aggregation such as 3G-LTE. When analog signal of multiple bands is converted to digital by converter (ADC), proposed controls each band effectively. We first analyze the method AGC general OFDM The analysis will show that value unstable because channel status or presence packet difference with losses for radio (RF) front end band. fluctuation...

The purpose of this study is to assess the organizational types and job stress factors that affect procedure-based performances in nuclear power plants. We derived 24 affecting level plants from analysis models developed by NIOSH, JDI, IOR. Considering safety characteristics operating tasks plants, we identified contents through analyses assignments appeared chart results an activity-based costing. By using questionnaire surveys structured interviews with plant personnel expert panels,...