Session Index

High-performance planar-type InGaAs/InP avalanche photodiode (APD) with single guard ring was fabricated and characterized. Biasing at 0.9 breakdown voltage and room temperature, the dark current of 7.58 nA, multiplication gain of 10.5, capacitance of 0.52 pF, f3dB of 6 GHz, and the gain-bandwidth product of 72 GHz were obtained simultaneously in this work.

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We present an image-resolved approach to calibrate and correct phase errors of Mach-Zehnder-interferometer-based (MZI-based) programmable photonic integrated circuits. Via integration of grating couplers to tap waveguide power in the circuits, we can capture the phase information of key MZI elements in the circuits by investigating the light emitted from the grating couplers through an external infrared camera. All the thermo-optic phase tuners and the infrared camera are interfaced with a LabVIEW program, which can build a large-scale software-defined photonic integrated circuits.

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5G sub-6 GHz/MMW signal transmission over two-way phase-modulated fiber- FSO-wireless links employing remotely injection-locked DFB LDs as transceivers is proposed and successfully achieved. It shows a promising link because of its advancement for incorporating fiber trunk with FSO-5G wireless feeder, and also its advancement for adopting remote injection locking DFB LDs as transceivers to afford two-way 5G emerging services and applications.

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A simple, low-cost, single-longitudinal mode, C-band narrow-linewidth optical fiber laser is presented based on the methodology of the Rayleigh backscattering. In this paper, a 1552 nm fiber ring laser is developed, and single-mode fiber is added to compress the line width. The laser linewidth is 1.46 kHz. The optical signal-to-noise ratio is 59.86 dB, and the output power is 9.3 mW. The result shows that the proposed architecture can easily achieve single longitude-mode output by controlling the variable optical attenuator.

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In this study, we present a high-efficiency InGaN red micro-LED fabricated by the incorporation of the superlattice structure (SL), atomic layer deposition passivation, and a distributed Bragg reflector (DBR), exhibiting maximum EQE of 5.02% with a low efficiency droop corresponding to an injection current density of 112 A/cm2.

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We employed a cascaded Mach-Zehnder interferometer for optical interleaving and an array of racetrack ring resonators for optical channelization. Their combination leads to a 100-GHz spaced wavelength (de)multiplexer for CW-WDM with an optical crosstalk as low as -24 dB.

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We demonstrate a “III-V photodiode over silicon grating coupler (PD-over-GC)” device concept that enables an overall responsivity of 0.964 and 0.367 A/W for 1D and 2D grating coupler, respectively. This is attributed to the fact that the upward optical directivity of 1D (2D) grating coupler achieves 0.9 (0.5), and the III-V photodiode chip accepts a wide range of optical incidence.

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We propose a high-efficiency electro-optically tunable LiNbO3 microdisk resonator using graphene electrodes and three-period outside-ring electrode design. The use of ultra-thin, transparent graphene electrodes not only increases the transmission of the resonant field but also reduces the device fabrication complexity and the fabrication cost. Besides, the proposed three-period outside-ring electrode design can avoid the cancellation of electro-optically induced phase and increase the electro-optic tuning efficiency. The electro-optic tuning rate of the proposed LiNbO3 microdisk resonator is as high as 9.92 pm/V for the TE mode.

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The electro-absorption modulated laser (EML) are now widely used in the high speed transmission, because of its compactness and large bandwidth for transmission at very high data rate. We utilize the heterodyne detection technique to characterize the influence of low frequency drop for an EML. This method provides high resolution in the frequency domain and the measured responses contain both the amplitude and phase information.

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A low-loss (< 0.9 dB), low-crosstalk (< -17 dB), broadband (1500~1600 nm), and fabrication-tolerant optical mode (de)multiplexer is implemented on silicon-on-insulator. This device would enable a high-speed optical link with the combination of wavelength- and mode-division multiplexing schemes.

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We demonstrate and characterize a wide field-of-view (FOV) visible-light-communication (VLC) system using LED light-panel and long-short-term-memory-neural-network (LSTMNN). At a distance of 1m, FOVs of ±70o and ±60o in horizontal and vertical directions can be achieved respectively.

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In this work, we demonstrate silicon nitride micro-ring resonators with air cladding, hafnium oxide (HfO2) cladding, and SU8 polymer cladding and study the effect on waveguide dispersion. By using atomic layer deposition (ALD) HfO2 as the outside cladding layer, the waveguide dispersion can be tuned less in the normal regime at a wavelength of 1550 nm while polymer cladding provides the waveguide dispersion from anomalous to normal.

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We demonstrate the nanostructural reflective polarization converter in silicon waveguide. The reflection of the device is 93.1% when the conversion length is 9.21um with 50 periods. The ultra-wide band width is 170nm at the central wavelength of 1.55um and it covers from 1.45um to 1.62um.

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To mitigate the thermal rollover in vertical-cavity-surface-emitting-lasers (VCSELs), gating-pulse operation with long turn-off time is proposed for the time-of-flight (TOF) sensing application. The rise and fall times can be reduced by >48%.

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We propose flexible integration of groove process to passively edge-couple the optical fibers with on-chip integrated waveguides. By fabricating U-grooves before the waveguide formation, this groove-first process provides a universal platform for hybrid, large-scale photonics.

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In this study, a simple-structured one-dimensional GMR grating that utilizes thin-film properties to enhance FOM is proposed. The electric field intensity in the grating is simulated to evaluate the enhancement of FOM. The waveguide grating structure achieves an extremely high FOM of 839666. A high-performance RI sensor in the near-infrared spectral range is achieved by modifying the geometric parameters. This easy-to-fabricate GMR-based all-dielectric sensing device holds great promise for realizing high-performance and compact broadband RI sensors in biochips, electronic tongues, electronic noses, and so on.

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In this study, we demonstrated a robust terahertz communication system and analyzed the received energy. The result shows the signal-to-noise ratio of the received signal and the system’s channel capacity. The outcome gives the direction of construction and improvement of the broadband terahertz communication based on radio-over-fiber.

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Since optical limiting can be a bottleneck of device performance, accurate characterization of silicon waveguides for high optical power is now vital for modeling optical-powerconcentrated Si-Ph chips. We report the performance of our optical coupling machine and study the nonlinear loss of silicon waveguide with high power continuous-wave-(CW) 1.31 μm wavelength light sources. Detailed studies will be discussed in the conference.

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We demonstrate a modified and improved equivalent small-signal model of External Modulated Laser (EML), which can be used as high speed transmission model for estimating the distributed components of the device. The large-signal circuit model for fully describing the transfer function of EML is also included in this design. By the curve fitting of measured responses to extract device values of the equivalent circuit, the simulation can fit quite well with the measurement results for the EML at various bias voltages.

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The terahertz frequency band is predicted to be the dominant spectrum used in wireless communication in the next generation. Due to its massive unutilized bandwidth, it can be used to transfer massive volumes of data in a brief period of time. This study establishes an optical-based communication system capable of delivering 6G/terahertz signal carriers. This experiment presents the 4 Gbps to 12 Gbps OOK signal transmission through wireless distances shorter than 3 meters when the carrier frequency is set to 125GHz. A UHD video signal is eventually transmitted across the system, revealing the possible applications for high-resolution video streaming.

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In this paper, a two-channel mode division multiplexer (MDM) integrated with SiGe electro-absorption modulators (EAM) on a Si photonics chip is proposed. Directional coupler-based mode multiplexer, two SiGe EAM, and two-dimension grating coupler were integrated in a module, leading to >2.5dB dynamics extinction ratio and overall 100Gb/s non-return-to-zero (NRZ) eye diagram of modulation.

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