- 标题
- 摘要
- 关键词
- 实验方案
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Enhanced NRZ multi-carriers modulation technologies for microresonators in THz technology applications
摘要： Multi-optical carriers suitable for use in an optical communication system have been generated via integrated microring resonators. These carriers were sufficiently stable for travel in either a free space channel or waveguides while experiencing very low dispersion. Multiple carriers were created using the integrated microring resonators, with each carrier possessing a frequency at 193.012, 193.086, 193.186 and 193.268 terahertz (THz). The second part which is the non-return-to-zero (NRZ) modulation has been performed using the microring resonator modulators. The objective of the research is to generate multi-carriers at infrared region and modulate them for the optical communication application using the microring resonators. At the transmitter part, series of microring resonators have been used to generate four different THz frequencies which can be either de-multiplexed and modulated individually using the NRZ modulation format or modulated without de-multiplexing them as these enter a series of microring resonator modulators and microring resonator drop filters. As results, the detection of the four NRZ modulated frequencies has been performed successfully with high signal qualities. Therefore, in this research microring resonators are used for different purposes as to generate optical signals (at the transmitter part), modulate and filter them along an optical transmission link.
关键词： NRZ modulation,Microring drops,Microring modulators,Microring resonator
更新于2025-09-23 15:23:52
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Performances of Microwave Photonic Notch Filter Based on Microring Resonator with Dual-drive Modulator
摘要： A tunable microwave photonic notch ?lter with ultrahigh radio frequency (RF) rejection ratio is achieved by using a dual-drive Mach–Zender modulator and a microring resonator. In addition, we dedicated to clarify the mechanisms of the microwave photonic notch ?lters based on a microring resonator under both overcoupled and undercoupled states and the performance differences between these two situations are investigated in detail. Furthermore, the experimental results show that the cancellation microwave photonic notch ?lter with ultrahigh RF rejection ratio can be achieved with both undercoupled and overcoupled microring resonators. Besides, an RF rejection ratio exceeding 50 dB was achieved for a microring resonator with an optical extinction ratio of only 4 dB, where a 46-dB enhancement from optical to RF response is obtained. Also, the bandwidth of the microwave photonic ?lter can tuned from 0.65 to 2.2 GHz by adjusting the coupling ratio of the ring resonator. Meanwhile, by tuning the wavelength of the optical carrier, the ?ltering frequency can be tuned and a tuning range of about 25 GHz was achieved. The implementation is much simpler and more economical compared with previous reports and has great potential in monolithic integration of microwave photonic ?lters on chip.
关键词： Optical ?lter,Microwave photonics,Microring resonator,Integrated optics devices
更新于2025-09-23 15:23:52
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Simulation and Analysis of Single-Mode Microring Resonators in Lithium Niobate Thin Films
摘要： The single-mode microring resonators on lithium niobate thin films were designed and simulated using 2.5-D variational finite difference time domain mode simulations from Lumerical mode Solutions. The single-mode conditions and the propagation losses of lithium niobate planar waveguide with different SiO2 cladding layer thicknesses were studied and compared systematically. The optimization of design parameters such as radii of microrings and gap sizes between channel and ring waveguides were determined. The key issues affecting the resonator design such as free spectral range and Quality Factor were discussed. The microring resonators had radius R = 20 μm, and their transmission spectrum had been tuned using the electro-optical effect.
关键词： electro-optical,integrated photonic,varfdtd,LNOI,microring resonator
更新于2025-09-23 15:23:52
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Toward <i>Special-Relativity-on-a-Chip</i> : analogue of Einstein velocity addition using optical add-drop filter (OADF)
摘要： We present an optical analogue of a central concept (not a specific relativistic effect) in Special Relativity (SR) that underlies many relativistic effects. This concept is the Einstein Velocity Addition (EVA) which plays a fundamental role in the development of SR. The photonic circuit analogue is between the EVA, and the complex electric field, through the output signal of the optical add-drop filter (OADF). The OADF is one of the key building blocks for wavelength filtering in photonic integrated circuits (PICs or photonic chip). This analogue strengthens the vision toward a Special-Relativity-on-a-Chip. The analogy is established by equating the two relativistic normalized velocities in EVA with the two transmission coupling coefficients of the two directional couplers in the OADF. Furthermore, the generating angle in the EVA is associated with the single-pass phase shift of the OADF. We analyze its magnitude and directional angle in detail. Lastly, other important consequences are also briefly discussed.
关键词： Special Relativity,Einstein velocity addition,Photonic integrated circuits,microring resonator (MRR),optical add-drop filter (OADF)
更新于2025-09-23 15:23:52
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Spin-wave generation using MZI embedded plasmonic antennas for quantum communications
摘要： Spin wave generation formed by a soliton pulse within MZI embedded plasmonic antennas has been proposed. A soliton is the orthogonal (entangled) source that can be configured as the vertical and horizontal components in the same way as the polarization components. A dark soliton of wavelength 1.55? μm is selected and fed into the MZI input. The dark-bright soliton pulse entered into the upper and lower branches to form uplink and downlink antennas. The whispering gallery mode (WGM) can be generated by controlling the two side ring phase modulators. The gold grating surface is excited by the WGM input form the circuit, from which the electric dipoles oscillated. The trapped electrons by soliton pulses transmitted. The dipole oscillation of the antennas identified by plasma frequencies (Bragg wavelengths), which can form the spin-waves. The simulation programs are Opti-wave and Matlab programs, from which the used parameters are selected from the realistic device parameters. The simulation results obtained show that the transmission bandwidth of 600? GHz with the antenna directivity of 7.78, and 4.63 for the uplink and downlink respectively and antenna gain (power) of 1.13?dB, and 1.07?dB for the uplink and downlink respectively. The transmission signals and power stability are confirmed by the transmis-sion entanglement. The quantum sensor networks can also be applied, where the trend of the sensor sensitivity linearity is achieved.
关键词： Gold grating,Soliton communication,Microring resonator,Plasmonic antenna,Spin-waves,MZI
更新于2025-09-23 15:21:01
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Modal characteristics of refractive index engineered hybrid plasmonic waveguide
摘要： In this work, we proposed a novel design of a refractive index engineered subwavelength grating silicon-based hybrid plasmonic waveguide via the finite element method. The intensity integral (Γ) in the upper cladding can be controlled by varying the thickness (HSi) of the top silicon layer. The highest evanescent field ratio of 0.85 is obtained at HSi=200 nm which allows the hybrid mode to confine in the low index medium and a large evanescent field resides in the upper cladding. The sensitivity of the waveguide is calculated by monitoring the change in the effective refractive index to the ambient refractive index. The maximum mode sensitivity of 0.7 is obtained. The spectral performance of the subwavelength grating (SWG) hybrid plasmonic waveguide (HPWG) based ring resonator design is studied which exhibits a sensitivity as high as 1000 nm/RIU which is higher than the previously reported values. We believe that the proposed waveguide scheme is an ideal candidate to produce highly sensitive lab-on-chip sensors.
关键词： microring resonator,refractive index sensor,Subwavelength grating hybrid plasmonic waveguide,Evanescent field ratio
更新于2025-09-23 15:21:01
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Performance of Arrayed Microring Resonator Sensors with the TriPleX Platform
摘要： Integrated-optical (bio) chemical sensors are more and more commercialized, mainly because of their high intrinsic sensitivity in combination with the possibilities they offer for integration in optofluidic devices. The microring resonator (MRR), for example, is a very feasible structure to be used as microarray sensor element for multiplex biosensing. Fabrication of MRRs has been described in the case of the TriPleX platform employing well-defined stacks of stoichiometric Si3N4 and SiO2 material. This platform allows for a wide variety of applications, due to its intrinsic low loss and its transparency for the VIS/NIR wavelength range. In the present paper, we describe the recent achievements in the characterization of arrays of these MRRs regarding temperature sensitivity, refractive index sensitivity and protein immobilization performance. Furthermore, the use of a reference channel/reference MRR is demonstrated in order to show the advantage of compensation of unintended change in temperature or sample composition. The refractive index sensitivity was determined to be 104 nm/RIU and the limit of detection was about 2 × 10-6 RIU. MRRs appeared to behave very comparable (expressed as the coefficient of (intra-array) variation (CV)) regarding the response to temperature (CV≈0.3%) as well as refractive index (CV<0.1%). Furthermore, it is shown that protein immobilization onto the different MRRs of the same arrays can be realized in a comparable way (CV<3%). A good comparability (i.e., a low variation) in these aspects allows for the use of internal referencing in order to compensate for unintended change in temperature or refractive index and also helps to attain a high assay precision in the ultimate biosensing application. Ongoing research is focused on the integration of more functionality on chip and further miniaturization in order to allow for fabrication of complex, though affordable, sensor devices.
关键词： Refractive index,Biosensor,MRR,Sensor array,Integrated optics,Microring resonator
更新于2025-09-19 17:15:36
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Narrow bandwidth optimization using a polymer microring resonator in a thulium holmium fiber laser cavity
摘要： A thulium–holmium fiber (THDF) laser cavity has been demonstrated with a SU-8 polymer microring resonator (PMRR) in the cavity. The PMRR has a 500 μm radius and fabricated using the lithography method, with the SU-8 polymer acting as a host material. The butt coupling method was used for the horizontal coupling of light from a ultra-high numerical aperture (UHNA) fiber to the polymer waveguide. Lasing in the cavity without the PMRR is obtained at a center wavelength of 1.910 μm, 1.869 μm when the PMMR is inserted into the cavity. A maximum power of -5 dBm was extracted from the laser oscillator, and the laser linewidth was measured to be ～26.6 kHz by radio-frequency spectrum analyzer analysis. The PMRR was able to generate an output with a free spectral range of 0.79 μm at a frequency of 59.25 GHz.
关键词： Thulium–holmium fiber lasers,Narrow bandwidth,Polymer microring resonator
更新于2025-09-19 17:13:59
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Electro-optically tunable racetrack dual microring resonator with a high quality factor based on a Lithium Niobate-on-insulator
摘要： We propose and analyse a novel electro-optically tunable racetrack dual microring resonator with a high Q factor based on a lithium niobate-on-insulator. Using the transfer matrix method, the field transmission and attenuation of the resonator are comparatively investigated to obtain optimised coupling parameters. The enhanced Q value at the resonant wavelength of the inner ring can reach 3.873 × 106, and the blue shift of the resonant wavelength is approximately 16 nm when the applied voltages fall in a ±150 V range resulting in an electro-optic tuning rate of 0.0526 nm/V. The designed resonator presented here exhibits high performance and may offer more potential applications for lithium niobate nanophotonic devices.
关键词： electro-optic effect,lithium niobate-on-insulator,optical microring resonator,quality factor
更新于2025-09-19 17:13:59
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Enhanced Small-Signal Responsivity in Silicon Microring Photodetector Based on Two-Photon Absorption
摘要： We experimentally investigated methods of enhancing the small-signal responsivity of a silicon pin microring photodetector based on two-photon absorption for detecting small optical signals in the telecommunication wavelength range. Two approaches are demonstrated, the first exploiting the bistability effect in the nonlinear microring resonator while the second employing an optical bias at a different wavelength to increase the differential responsivity. We achieved a small-signal responsivity of 180 mA/W with the first approach and 141 mA/W with the second approach, both of which represent almost 10-fold enhancement over direct detection of small optical signals by the same silicon pin microring detector. Our techniques have potential applications in amplitude demodulation, heterodyne detection, and optical power monitoring in WDM communication channels.
关键词： microring resonator,photodetector,two-photon absorption,Silicon photonics
更新于2025-09-19 17:13:59