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In this paper a practical application of an electrooptical communication system based on external modulation is reported. The sixteen ATSC TV-channels located at 2.4 GHz, were transmitted over a 30 km of standard optical fiber. The transmitted TV-signal uses Single-Side Band Full Carrier (SSBFC) modulation, allowing in this way an adequate management of the transmitted power and the bandwidth. The...
In this paper, an Erbium-doped fiber-based, broadband super-fluorescent fiber source (SFS) is proposed and demonstrated. Using a broadband fiber Bragg grating (BFBG) with temperature compensated by attaching it upon a carbon fiber composite, it has a very low mean wavelength drift of 1.26 ppm/°C in temperature range 0 °C to 60 °C. The fluorescent fiber source structure is designed in a double-pass...
This paper evaluates the impact of the optical and electrical filtering on the performance of wavelength-division-multiplexed passive optical network (WDM-PON) transmission system with four-level pulse amplitude modulation (PAM-4) format and 40 Gbit/s (20 Gbaud/s) per-channel data rate for the optical C and L frequency bands. Paper determines the combination of the implemented electrical and optical...
Despite the high phase non-linearity of a Silicon Mach-Zehnder Modulator in forward bias, we demonstrate that high third order spur-free dynamic range ~102.8 dB. Hz2/3 can be obtained by optimizing the D.C. bias operating point at 1 GHz.
Meeting the ever-growing information rate demands has become of utmost importance for optical communication systems. However, it has proven to be a challenging task due to the presence of Kerr effects, which have largely been regarded as a major bottleneck for enhancing the achievable information rates in modern optical communications. In this work, the optimisation and performance of digital nonlinearity...
We propose and demonstrate a new and extremely simple concept of reconfigurable photonic generation of arbitrary RF waveforms, based on a single CW laser and a frequency shifting loop. Our system does not require broadband light source or fast electronic generator. It is capable of generating arbitrary RF waveforms with duration ranging from 1 ns to more than 100 ns, and with dynamic performances...
We demonstrate evanescently-coupled waveguide modified uni-traveling-carrier (MUTC) photodiodes with more than 105 GHz bandwidth. The photodiodes have dark currents as low as nA and deliver RF output powers of 5.1 dBm, 4.4 dBm and 3.5 dBm at 75 GHz, 80 GHz and 90GHz, respectively.
The talk reviews recent results from high-power high-speed photodiodes. Waveguide photodiodes and integrated photodiode-antenna emitters for 100 GHz are described.
We demonstrate a novel technique for the generation of fully-reconfigurable radio frequency chirped waveforms with extremely simple hardware based on a single CW laser and a frequency-shifting loop. All the waveform parameters, namely sign and value of the chirp rate, bandwidth, repetition rate and chirp duration are fully reconfigurable by simply tuning the frequency of a MHz-range single RF tone...
Both constant-period and broadband chirped long-period gratings (LPGs) are generated in photonic crystal fibers (PCFs) by using a constant period V-grooved plate or solenoidal wiring device. The central wavelength and rejection bandwidth of LPGs can be tuned over a broad spectral range with adjustable transmission loss. In contrast to the conventional LPG sensors with longitudinal stretch or compression,...
In the context of the augmented demand for high capacity and uninterrupted communication links, radio-over-fiber technology provides advantage in terms of reduced power dissipation and broad operational frequency bandwidth. In such a link, a vertical-cavity surface-emitting laser plays an important role as an optical source, due to its real-time RF modulation capability, and consequently, the understanding...
Methods from machine learning community are employed for estimating the position of fibre Bragg gratings in an array. Using the conventional methods for position estimation, based on inverse discrete Fourier transform (IDFT), it is required that two-point spatial resolution is less than gratings' spacing. However, we show that by employing statistical inference methods in combination with adaptive...
This work studies a digital transmission system by fiber optic. We give special relevance to the synchronism block. The fiber is a transmission medium with large bandwidth and low attenuation. These characteristics allow high speed and long distances. The transmission, instead asynchronous, it is synchronous what provides a big efficiency of 100%. However, the synchronous transmission needs a synchronizer...
Analog Radio-over-Fiber (a-RoF) has gained increasing attention in the context of next-generation optical networks due to its spectral efficiency and lower deployment cost. However, electro-optical conversion of the information signal is delicate since the non-linear characteristic of the electro-optical modulator's transfer function causes inter-channel interference and poses a severe limitation...
This paper proposes a novel fiber ring laser utilizing taper-coupled double-microsphere-cavities (TC-DMC) to stabilize its single-longitudinal-mode operating with a 0.01 nm narrow bandwidth. Fundamental properties including whispery gallery mode (WGM) mode distribution and transmission spectra in the DMC are investigated both theoretically and experimentally. Due to Vernier effect, the WGM spectrum...
In Elastic Optical Net-works (EONs), dynamic allocation and release of lightpaths will lead to frequency spectrum fragment issue which making the optical spectrum into non-aligned, isolated and small-sized spectrum segments. Defragmentation strategies are key issues to minimize this problem. In this paper, we investigate the states of spectrum when the bandwidth blocking probability (BBP) is high,...
In this paper, we investigate the energy-efficient grooming with distance-adaptive load balancing (EEG-DALB) in flexible bandwidth optical networks. For comparison, an existing energy-efficient approach without grooming and load balancing (EEA-WGLB) is also introduced. Simulation results show that the proposed EEG-DALB achieves better performance in terms of the blocking probability and average power...
In the framework of the EU-funded research project “FABULOUS” we experimentally demonstrate an innovative FDMA-PON architecture whose upstream transmission is based on a reflective Mach-Zehnder modulator, reaching an overall upstream capacity of 32 Gbps per wavelength over 31 dB ODN loss in several previously published experiments targeting 1 Gbps per user and using 16-QAM as a modulation format....
In this paper, various trade-offs for the design of short-range optical interconnects for on-board communication in a high-performance computer (HPC) will be discussed. Energy consumption and bandwidth requirements of the components, which are used for the realization of an optical link in future highly adaptive energy-efficient computers, will be estimated based on the energy consumption and bandwidth...
In this paper, we propose a distance-adaptive load balancing algorithm to improve spectrum efficiency and to reduce power consumption in flexible bandwidth optical networks. Simulation results show that our proposed DALB algorithm significantly reduces blocking probability but consumes more power consumption compared to the traditional Dijkstra algorithm under the 40 Gbps, 100 Gbps, and mixed line...
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