Session Index

Photonic-crystal surface-emitting laser which has advantages of high power, small divergence angle, circular light output, stable single-mode operation and beam tailoring capability. In order to meet the requirement of outdoor 3D sensing and light detection, further improving of the output power is a matter of consequence. We propose and demonstrate a new way to fabricate PCSEL arrays and analyze the influence of design parameters.

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We developed a four-stage integrated photonic circuit based on type-0 spontaneous parametric down-conversion (SPDC) and electro-optic (EO) techniques. The chip combines the functions of photon-pair generation, high efficiency polarization mode conversion (PMC), and phase modulation (PM). We systematically verify those functions above and demonstrate their high performance. The developed chip provides a compact and robust platform for generating and manipulating nonclassical light, which has huge potential for application to optical quantum computing and quantum communication.

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A novel electrode design in compact VCSEL array that effectively enhances high-speed data transmission has been demonstrated. Simultaneously, it exhibits dampened and wider 3-dB E-O bandwidth (18 vs. 14 and 11 vs 9 GHz), better eye-pattern quality and narrow divergence angle (FWHM: 11o and 9o).

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The passively mode-locked Er-doped fiber lasers (PML-EDFLs) was demonstrated by using graphene oxide/silk fibroin (GO/SF) films as a saturable absorbers. The modulation depth (ΔT) and saturation intensity (Isat) of GO/SF, around 3.63 % and 17.01 MW/cm2, respectively, has been obtained by means of nonlinear optical transmittance measurement. As pump power increases from 154 to 244 mW, the EDFL can be operated at fundamental mode-locked state without pulse splitting. The mode-locked pulses revealed the 824 fs pulse duration τ, 19.06 kHz repetition rate, and near transform limited TBP around 0.326.

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We designed and manufactured a low-cost, high-reliability 1.3 μm DFB for direct modulation applications. The carrier injection efficiency is improved by optimized epi-structure, which further enhances the high-speed characteristics of DFB lasers in high-temperature environments. The threshold current of the DFB laser is less than 10 mA at room temperature, the optical intensity exceeds 20 mW, and the SMSR is greater than 50 dBm. Under high-temperature conditions, the modulation frequency exceeds 17.1 GHz.

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This study investigates a high-entropy and broad-band chaos generation technique based on two mutually coupled semiconductor lasers for true physical random number generation. The proposed chaotic source can work as a 5-bit physical random bit generator at a rate of 50 Gbps with guaranteed unpredictability.

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We propose a novel all-optical photonic approach for high-frequency microwave generation based on period-one dynamics of two mutually coupled semiconductor lasers under highly asymmetric coupling strength. As a result, a 73.1-GHz microwave with a 3-dB linewidth below 3 kHz and a side-peak-suppression ratio above 45 dB is generated.

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We demonstrated the high-order vortex beam with the photonic-crystal surface-emitting lasers (PCSELs) in honeycomb lattice. The laser structure, photonic crystal band diagram, the light-current-voltage (L-I-V) curves and the far-field patterns were presented in this article. Furthermore, the result also contained the vortex analysis, and it showed that the PCSEL had high-order vortex beam with orbital angular momentum l=±2.

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