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High-spectral-efficiency 600-Gbps/carrier Transmission Using PDM-256QAM Format
摘要： High-capacity carrier signals with high-order modulation are being considered for data center interconnection (DCI) applications as they can reduce the cost per bit by decreasing the number of devices and increasing fiber capacity. However, signal quality degradation due to device imperfections affecting the frequency response has limited the capacity per carrier of PDM-256QAM signals to under 400 Gbps. Here, it is possible to use a calibration method for dealing with device imperfections wherein a fixed equalizer separately calibrates the frequency response of the transmitter and receiver. Our previous study showed that PDM-256QAM signals at up to 48 GBaud could be transmitted over 100 km, while it used an experimental setup with total 3-dB analog bandwidth of 13 GHz and 20 GHz for transmitter and receiver, respectively. A micro-integrable tunable laser assembly (μITLA) with a typical linewidth of 20 kHz, maximum under 100 kHz. Actual data center interconnection (DCI) applications, however, are expected to use dense wavelength division multiplexing (WDM), so in this study, we examined transmission of 10-WDM 48-GBaud PDM-256QAM signals in a 50-GHz grid and evaluated the WDM penalties. The resulting spectral efficiency (SE) of 600-Gbps/carrier WDM transmissions was as high as 12.02 bit/s/Hz.
关键词： optical,digital coherent,fiber,optical transmission,signal processing,digital communication,high-order quadrature amplitude modulation
更新于2025-09-23 15:23:52
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Area-Efficient Analog FIR Filter for Multi-Level Optical Transmission; 多値光伝送歪み補償に用いる小面積アナログFIRフィルタ;
摘要： The transmission of waveforms through optical fiber usually results in some waveform distortion. To smoothen this distortion, digital finite-impulse response (FIR) filters are commonly employed. Digital FIR filters require a relatively large area for digital signal processing (DSP) on IC chip, so an analog FIR filter is adopted. According to past researches, it is possible to realize a small area circuit by using a CMOS inverter as a delay circuit. However, number of delay circuits employing CMOS inverter increases N/2 for Multi-Level optical transmission. Therefore, we propose a new multiplier and attempted to reduce the circuit area of 4 PAM analog FIR filter. According to the estimation using SPICE simulation, it can be expected to reduce the area by 25% by using the proposed configuration.
关键词： analog FIR filter,CMOS inverter,gilbert cell,multi-level,28 nm FDSOI,optical transmission
更新于2025-09-23 15:22:29
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AIP Conference Proceedings [AIP Publishing LLC NANOFORUM 2014 - Rome, Italy (22–25 September 2014)] - Structural and optical properties of Sn1-xMnxO2 thin films
摘要： Sn1-xMnxO2 thin films are deposited by spray pyrolysis method. XRD of all the thin films show the amorphous nature. Synthesis of SnO2 is also confirmed by FTIR spectroscopy. Undoped SnO2 thin film is 60-70 % transparent in visible and near IR region and it increases up to80-90% for 20 at. % Mn doped SnO2 thin film. The optical band gap is tunable linearly between 3.34 to 3.96 eV for 0≤x≤0.20 for Sn1-xMnxO2 amorphous thin films.
关键词： and FTIR,Thin Films,Band Gap,Optical Transmission
更新于2025-09-23 15:22:29
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Coupling between plasmonic nanohole array and nanorod arrays: the emerging of a new extraordinary optical transmission mode and epsilon-near-zero property
摘要： The compound Ag nanohole structures with an Ag nanorod in the middle of an Ag nanohole are investigated by finite-difference-time-domain calculations. The structure shows strong polarization-dependent optical properties. A new extraordinary optical transmission (EOT) mode is observed when the polarization direction is aligned with the long axis of the nanorods, and its resonance wavelength red-shifts exponentially with the nanorod length. Around this resonance wavelength, the real part of the effective permittivity also becomes zero, demonstrating the epsilon-near-zero (ENZ) property. The new EOT mode is found to be the result of the enhanced local radiation of the nanorods as well as the electromagnetic coupling to the nanoholes to produce the enhanced transmission. The tunable resonance wavelength, EOT, strong near-field enhancement, and ENZ properties make the structure ideal for many potential applications, such as ultrathin optical filter, polarizers, surface-enhanced spectroscopies, etc.
关键词： tunable transmission,epsilon-near-zero,nanohole array,extraordinary optical transmission,nanorod array
更新于2025-09-23 15:21:01
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Plasmonics Induced Multifunction Optical Device via Hoof-Shaped Subwavelength Structure
摘要： The electromagnetic spectrum includes the frequency range (spectrum) of electromagnetic radiation and its corresponding wavelength and energy. Due to the unique properties of different frequency ranges of the electromagnetic spectrum, a series of functional devices working in each frequency rang have been proposed. Here, we propose a periodic subwavelength hoof-shaped structure array, which contains a variety of geometric configurations, including U-shaped and rectangle structures. The results show that the enhanced optical transmission (EOT) effect of the surface plasmon excited by the hoof-shaped structure is highly sensitive to the polarization of the incident light, which leads to the peak’s location shift and the amplitude intensity variety of transmission peaks of U-shaped structure in the case of coupling based on the surface plasmon of rectangle structure. In addition, take advantage of the EOT effect realized in the periodic hoof-shaped structure array, we propose a multifunctional plasmon optical device in the infrared range. By adjusting the polarization angle of the incident light, the functions of the optical splitter in the near-infrared range and the optical switch in the mid-infrared range are realized. Moreover, with the changes of the polarization angle, different proportions of optical intensities split are realized. The device has theoretically confirmed the feasibility of designing multifunctional integrated devices through a hoof-shaped-based metamaterial nanostructure, which provides a broad prospect for the extensive use of multiple physical mechanisms in the future to achieve numerous functions in simple nanostructures.
关键词： interaction between light and metallic film,plasmonic optical device,enhanced optical transmission,coupled mode theory
更新于2025-09-23 15:21:01
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Optical isolation by hot atoms
摘要： A collection of hot rubidium atoms is shown to exhibit non-reciprocal optical transmission due to the interplay between thermal motion and electromagnetically induced transparency.
关键词： electromagnetically induced transparency,non-reciprocal optical transmission,optical isolation,hot atoms
更新于2025-09-23 15:21:01
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[IEEE 2018 Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO) - Minsk (2018.7.4-2018.7.5)] 2018Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO) - On one principle of monitoring the network of optical transmission systems
摘要： The paper considers one new principle of monitoring the network of optical transmission systems. A new scheme of a device for monitoring is compiled and the principles of operation of this device are analyzed. Defined technical management of failures as a warning, detection and reaction to malfunctions. Failures are defined as interruptions to the normal operation of the network and include random interrupts, as well as losses of photons (or solitons), that can be performed by a service failure or eavesdropping. For this purpose, the functionality of the monitoring device and the algorithm for optical networks with different wavelengths have been expanded to be used in backbone, passive optical networks to determine the location of the cliff, the location of the eavesdropping, and unauthorized attacks. The enhancement capability is based on the study of other optical network switches, optical elements, multiplexers of / output, optical cross connections, wavelength converters, optical line terminals, etc. The vulnerability of these elements / or depends on manufacturing technology, and therefore, it is possible to consider the different types and forms of attenuation of optical signals, optical line breaks, loss and attack. The new design of the optical switch is applied, as a result, when the failure, attenuation and loss of optical signals are detected, the active port automatically switches to another port and simultaneously reports this to the central terminal device.
关键词： optical switchboard,translucent mirror,monitoring device,networks of optical transmission systems
更新于2025-09-23 15:21:01
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The Influence of Incident Power on the Magnetic Fluid Sensor Sensitivity Based on Optical Transmission Properties
摘要： Sensitivity is a critical characteristic of sensors, and increasing the sensitivity of the sensor is valuable for measurement study. Incident power has an important influence on the sensitivity of magnetic fluid sensors based on optical transmission properties. Variation in the magnetic field sensitivity at different incident powers was investigated by the measurement of transmitted power through the magnetic fluid sensors. As the magnetic field strength increases, the sensitivity variation of the magnetic fluid film sensor can be divided into four stages: first decreasing sharply, secondly increasing, then decreasing gradually, and finally tending toward a small stable value. The magnitudes of the change in the sensor sensitivity are influenced by the incident power, because the structural pattern of the nano-magnetic particles in the magnetic fluid sensor changes, the Soret effect and the Photonic Hall effect co-define the sensing system. In the weak magnetic field range, when a higher sensitivity is required, it is appropriate to select a larger incident power; however, in a large magnetic field range, when a higher sensitivity is required, a small incident power should be selected. Therefore, the magnetic fluid film sensor exhibits different sensitivity characteristics if different incident power values are chosen. The appropriate incident power can be selected according to the range of the magnetic field to be measured to improve the sensitivity in the magnetic field measurement study.
关键词： sensitivity,magnetic fluid sensor,Photonic Hall effect,incident power,optical transmission properties,Soret effect
更新于2025-09-23 15:21:01
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Kinetics of graphitization of thin diamond-like carbon (DLC) films catalyzed by transition metal
摘要： In this paper, we have studied the kinetics of graphitization at 773K of thin diamond-like carbon (DLC) films coated with minute amount of Ni metallic particles. DLC films are deposited at room temperature by pulsed laser deposition (PLD) on a transparent quartz substrate, and Ni is deposited on the surface of DLC using molecular beam epitaxy technique at room temperature. The ultra-high vacuum thermal (range 573-873K with 60 min annealing treatments) and kinetic (range 30-3760 min at 773K) behaviors of the deposited films are investigated. Surface and interface characterizations indicate that the growth of graphitic sp2 clusters starts at temperatures lower than 573K. The kinetics of graphitization is recorded at 773K. Thus, the continuous growth of graphitic clusters leads to a long-range kinetics. These clusters are responsible for the increase in the electrical conductivity and carrier mobility, reaching values of 6.103 Siemens/cm and 20 V/cm2?s, respectively. This continuous change is not only explained by the nucleation and growth of graphitic clusters, but also by some reorientation of them alongside both the surface and the quartz substrate. The obtained results demonstrate that thermally post-treated catalytic metal/DLC films are promising materials for conductive electrodes and sensing applications.
关键词： Raman spectroscopy,thermal treatment,electric transport measurements,optical transmission and absorption,diamond-like carbon,thin graphite films,pulsed laser deposition,metal catalyst
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Electroless Silver Plating of Additive Manufactured Trough Waveguide Mode Transducer and Antenna Structure
摘要： This paper focuses on upstream signaling in TWDM-PON (one of the two systems speci?ed in the new series of ITU-T G.989.x Recommendations for NG-PON2), for what concerns the discovery phase of a new ONU. The key idea is that a new ONU, that needs to be discovered by the OLT, would send a low bit rate signal that is set to a suf?ciently low-power level to not affect signi?cantly the upstream transmission performance of already active ONUs. We properly dimension the key physical layer parameters of this technique and demonstrate it experimentally. We named this proposal as “photon ranging” due to its ultralow-power transmission and we experimentally demonstrate its feasibility. As a “side effect” of this study, we had to deeply revise the power penalty generated by the optical interferometric crosstalk, the main impairment that impacts the proposed setup, obtaining new results that may be of interest also in areas not directly related to the speci?c framework of TWDM-PON.
关键词： Interferometric crosstalk,optical networks,optical transmission
更新于2025-09-23 15:19:57