To fabricate a large mode area EYDF, a modified chemical vapor deposition process was used, and the effects of Er3+ concentration and seed power were concurrently simulated on 1-meter ASE. The master oscillator power amplifier (MOPA) configuration was augmented with a ytterbium-doped fiber to absorb the simultaneously generated 1-µm amplified spontaneous emission (ASE). An all-fiber configuration's experimental results show 345 W of output power, a 43% slope efficiency at 1535nm, and an effective suppression of 1-meter ASE. As far as we are aware, this Er/Yb co-doped fiber, within an all-fiber MOPA configuration, delivers the highest achievable power output.Omnidirectional light sources, when utilized in underwater wireless optical communication (UWOC) broadcast systems, incur significant energy consumption due to substantial geometric losses and water attenuation. High-sensitivity photon detectors, not surprisingly, have a limited dynamic range, which consequently restricts the attainable communication distance. This correspondence details a UWOC system, employing liquid crystal variable retarders (LCVRs) and polarization beam splitters (PBSs), that allocates user power according to individual user channel characteristics. By adjusting the alternating current (AC) voltage controlling the LCVRs, the polarization of the incident light is modified, enabling distinct amounts of light to be directed to unique PBS ports prior to their transmission to different users. Within the dual-user transmitter's proof-of-concept, the first user exhibits an output power dynamic range of 1917dB and an insertion loss of 091dB. The second user's performance degrades to 1733dB and 126dB, respectively, in their metrics. The power adjustment's minimum step value is less than 0.063 decibels. A 7-meter/2432-Mbps single-user UWOC framework is developed to validate the impact of power regulation in underwater optical communication systems, incorporating water attenuation coefficients spanning 0.50 dB/m to 2.35 dB/m. By manipulating the LCVR driving voltage, all instances of bit error rates (BERs) can be diminished such that they lie below the forward error correction (FEC) boundary. By adjusting the channel attenuation coefficient to 144 decibels per meter, the communication range could be extended from 42 meters to a maximum of 1319 meters. In conclusion, a dual-user UWOC experiment validates the proposed system's ability to function effectively in a multi-user setting. Proven to be effective in bolstering the anti-jamming capability and adaptability of UWOC networks, the proposed system is a valuable addition.In this letter, we posit a locally optimized implementation of Stokes polarimetry. Focusing on polarization measurements and their susceptibility to Poisson noise, the studies establish a novel, to the best of our knowledge, optimization function. This function is a combination of equally weighted variance and condition number. Within this method, the stability and precision of polarization measurements are considered; a 248% growth in the condition number yields a 191% decrease in equal-weighted variance near the north pole. The advantages of this local optimization method are displayed through Monte Carlo (MC) simulations and tests of continuous polarization state modulation. Finally, a 4-meter pathological section's visual representation demonstrates the possibility of this novel local optimization method improving polarization measurements and enabling its broader use in biomedical studies.Employing dynamic mode decomposition, we show a significant reduction in noise from dispersive Fourier transform datasets, allowing for enhanced quantitative analysis of experimental data. We, therefore, demonstrate how the oscillations of a soliton molecule are indeed a consequence of the complex interplay among multiple elementary vibrational modes.We promote a more practical model, focused on plasmonic core@shell-satellite antenna-reactor photocatalysts. An alternative perspective reveals that total light absorption in Pt nanoparticle (NP) reactors can be further improved by 70% after a 10-nm-thick high-refractive-index TiO2 shell is applied to the wide Ag antenna. This is due to more Pt nanoparticles undergoing higher absorption enhancement. Maximum enhancement effect is observed precisely at the electric quadrupole (EQ) resonance. Considering the significant refractive index of the TiO2 coating and the integration of Pt NPs, the underlying physics demands a classical electrodynamic approach, which acts as a necessary addition to the standard plasmonic near-field enhancement mechanism. These findings offer a general strategy for the development of novel, to the best of our knowledge, visible light photocatalysts comprised directly of transition metals.A spatiotemporally coherent, high-power, ultrafast fiber laser system with high energy is introduced. Simultaneously amplified in sixteen parallel ytterbium-doped rod-type amplifiers are eight chirped-pulse amplification (CPA)-stretched pulses, each one following the previous. By combining the 128 amplified pulse replicas into a single, coherent pulse, spatially and temporally aligned, the resultant pulse is subsequently compressed by a partially gas-protected CPA compressor. Finally, pulses with an energy of 32 mJ and a duration of 158 fs, nearly Fourier-transform-limited, are emitted with a repetition rate of 20 kHz, possessing a beam quality close to diffraction-limited.The photonic spin Hall effect (PSHE) enhancement typically encounters limitations at incident light horizontally polarized and around the unadjustable Brewster angle. Theoretically investigated in this letter is a flexible strategy for improving the reflective performance of PSHE, utilizing adjustable incident angles under vertically (V) and horizontally (H) polarized illumination. The multipole decomposition method establishes that the variable generalized Brewster angle (GBA) is demonstrable under varying wavelengths of both vertically and horizontally polarized light in the all-dielectric metasurface. Due to the substantial Fresnel coefficient ratio at the GBA, the improved PSHE detailed in this letter is applicable to both V- and H-polarizations, and also attainable across adjustable incident angles and diverse operating wavelengths in the same metasurface. A straightforward technique to achieve adaptable improvements in PSHE is presented within this work, while also showcasing a unique approach for crafting a functional spin-based photonic device.This research unveils a fully guided system for single-mode squeezing in integrated titanium-indiffused periodically poled nonlinear resonators. A continuous-wave laser beam's squeezed field is gathered by single-mode fibers; these fibers demonstrate squeezing capabilities up to a useful level of -317(9)dB. A fiber-based phase sensing experiment, using the fiber-coupled device and generated squeezed light, showed a quantifiable quantum improvement in signal-to-noise ratio of 0.35 decibels, thereby demonstrating its usefulness. a-83-01 inhibitor Our investigation into photorefraction's effect on the cavity resonance condition suggests the development of system instability at high power.A single silicon dual-drive Mach-Zehnder modulator is employed in the high-linearity dual-drive scheme detailed here. Careful adjustment of the bias voltages and RF amplitudes of the two driving arms ensures that the nonlinearity of the Mach-Zehnder interferometer's transfer function compensates for the arms' nonlinear response. The proposed scheme demonstrates a remarkable 1234 dBHz6/7 dynamic range for third-order intermodulation distortion, free from spurious signals, potentially a record for silicon modulators. A different measurement obtained through a standard single drive scheme registered 1026dBHz2/3. The proposed system has the potential to streamline modulator design and foster high-performance microwave photonic connections.In a W-band millimeter-wave radio-over-fiber (MMW-RoF) system, a physical layer encryption scheme, combining coordinated security and probabilistic shaping (PS), is developed. The scheme is comprised of substitution encryption, coordinated encrypted physical signaling, and unequal length grouping scrambling, thus achieving coordination between the physical signaling and chaotic encryption processes. A key space of 10103 within the proposed scheme provides a formidable barrier against both brute-force and chosen-plaintext attacks. Over a 50-km standard single-mode fiber (SSMF) link and a subsequent 5-meter wireless channel, the encrypted orthogonal frequency division multiplexing (OFDM) signal was successfully transmitted. The findings demonstrate that the proposed scheme provides a 0.8 dB increase in received optical power at a bit error rate of 10-3, relative to a traditional OFDM signal. In terms of both security and bit error rate, the proposed scheme demonstrates superior performance, as confirmed.Employing a learning-based technique, this letter introduces a method for improving the efficiency of Fourier single-pixel imaging (FSI). AuSamNet, the adaptive under-sampling technique, leveraging an auto-encoder, achieves coordinated optimization of the sampling mask and the deep neural network. This allows for the under-sampling of the object image's Fourier spectrum and the preservation of high-quality reconstruction from the under-sampled measurements. Because of this, it is beneficial in determining the superior encoding and decoding process for FSI. The performance of AuSamNet in reconstructing high-quality natural color images, using a sampling ratio as low as 75%, is evident in both simulations and experiments. For computational imaging techniques like tomography and ptychography, the proposed adaptive under-sampling strategy is a valuable tool. Our source code release is now live.Crucially for optical integrated quantum computing protocols that leverage dual-rail encoding, waveguide intersections are indispensable for the implementation of SWAP or Toffoli gate operations. Adiabatic crossings are demonstrated with efficiency by us. The working principle is illustrated through simulations, and silicon nitride (SiN) test circuits are constructed to assess the coupling efficacy and insertion loss.