<![CDATA[ Journal of Lightwave Technology - new TOC ]]>
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TOC Alert for Publication# 50 2019July 15<![CDATA[Low-Loss Waveguide Fabrication by Inkjet Printing on Porous Silicon]]>μm. Measured values of the propagation loss at these wavelengths were 2.4 dB/cm and below 0.5 dB/cm, respectively.]]>371434393443894<![CDATA[High-Sensitivity Gas Pressure Fabry–Perot Fiber Probe With Micro-Channel Based on Vernier Effect]]>2 laser drilling method for hollow silica tube can effectively maintain the transient balance of the air pressure inside and outside the cavity without destroying the reflective ends of the optical fibers. Experimental results show that the prepared fiber probe with the SOHST length of 375.2 μm and column length of 247.3 μm has high gas pressure sensitivity of 80.3 pm/kPa by demodulating Vernier envelope, and it has relatively low temperature cross-sensitivity of -1.33 kPa/°C. This sensor is highly sensitive and of compact size, which not only can be applied in gas pressure sensing but also has the potential for application in microfluidic detection.]]>3714344434512772<![CDATA[Femtosecond Laser Writing of Optical Waveguides by Self-Induced Multiple Refocusing in LiTaO<sub>3</sub> Crystal]]>3 crystal utilizing multiple refocusing mechanisms of the femtosecond laser. Through the nonlinear process, multiple foci can be formed spontaneously with the interval of a few micrometers along the laser propagation direction. The number and the separation of focal spots, even the entire length of laser-induced tracks, could be modulated by varying the laser parameters. Taking advantage of this spontaneous phenomenon, we further implemented the multi-scan technique to write two parallel damage lines along transverse direction, realizing stress-induced waveguides by horizontal light confinement. Moreover, using this method, one-step two-channel guidance could also be demonstrated by adjusting the pulse energy. The fabrication details and waveguiding performances were studied by both experimental and computational methods. This paper opens the alternative way to construct complex integrated platforms in LiTaO_{3} crystal by using femtosecond laser writing.]]>3714345234582287<![CDATA[Optimization of the Linearity of InGaAs/InAlAs SAGCM APDs]]>3714345934644345<![CDATA[Deterministic Dynamic Networks (DDN)]]>3714346534745704<![CDATA[Non-Linear Phase Noise Mitigation Over Systems Using Constellation Shaping]]>3714347534821007<![CDATA[Semiconductor Laser Mode Locking Stabilization With Optical Feedback From a Silicon PIC]]>3714348334943910<![CDATA[Electrochemical Plasmonic Fiber-optic Sensors for Ultra-Sensitive Heavy Metal Detection]]>2+ as an example of a typical heavy metal ion. We show a stable and reproducible correlation between the real-time ion deposition–stripping cycles and the optical transmission of the optical fiber, with a limit of detection of 10^{−10} M and a dynamic range of nearly five orders of magnitude. Moreover, by taking derivative of the SPR amplitude change, we can clearly identify the peak stripping potential of the detected ions, and therefore, realize specific ion identification. The method proposed is inherently immune to temperature cross-talk because the core mode is temperature dependent but insensitive to the surrounding media. The proposed EC-SPR fiber-optic sensor has the advantages of compact size, flexible shape, and remote operation capability, thereby, opening the way for other opportunities for electrochemical monitoring in various hard-to-reach locations and remote environments.]]>3714349535022801<![CDATA[Fiber Optic Sensor Based on Vernier Microwave Frequency Comb]]>3714350335093849<![CDATA[Switchable Dual-Wavelength Mode-Locked Fiber Laser Source for In-PCF Parametric Frequency Conversion Applied to CARS Microscopy]]>$ {mathbf{c}}{ {mathbf{m}}^{ - 1}}$ (CH3-O molecular bonds) at 1031.5 nm and 1475 $ {mathbf{c}}{ {mathbf{m}}^{ - 1}}$ (CH2 δ molecular bonds) at 1049.7 nm.]]>3714351035163812<![CDATA[Design and Simulation of Ge-on-Si Photodetectors With Electrically Tunable Spectral Response]]>3714351735252386<![CDATA[Precision Dynamic Sensing With Ultra-Weak Fiber Bragg Grating Arrays by Wavelength to Frequency Transform]]>3714352635311871<![CDATA[112 Gb/s 16-QAM OFDM for 80-km Data Center Interconnects Using Silicon Photonic Integrated Circuits and Kramers–Kronig Detection]]>3714353235383286<![CDATA[Low Intensity Noise High-Power Tunable Fiber-Based Laser Around 1007 nm]]>3714353935431443<![CDATA[Investigation of Planar and Helical Bend Losses in Single- and Few-Mode Optical Fibers]]>$9.5text{--}19.5$ mm at 1550 nm wavelength. For in-plane bend simulations, we obtain the refractive index profile of an equivalent straight fiber by applying the geometrically exact beam theory (GEBT) and conformal mapping, against the conventional approach to use an elasto-optic factor to account for stresses experienced by the fiber. We apply GEBT to compute the strain tensor of a bent fiber. The strain tensor, in turn, is used in the stress-optic law to obtain the refractive index due to bending stress. To account for the geometric effect, we apply the conformal mapping technique. The refractive index profile obtained by applying GEBT followed by conformal mapping is used in full-vectorial FEM simulations carried out in COMSOL to compute bend loss at different diameters. The simulation and experimental results are in close agreement. We extend our approach to few-mode fibers by calculating the planar bend losses for higher order modes. The close agreement of the simulation results, generated without making any ad hoc assumptions about the elasto-optic factor to account for the stress effects, with literature validates our approach. Next, we describe the results of experiments to measure the bending losses of fibers wound helically around the mandrel for bend diameter range $9.5text{--}19.5$ mm and different helix pitch values. We derive an analytical formula to compute helical bend losses based on the method outlined by Marcuse. Although the results from th-
formula are in close agreement with the experimental results and predict the exponential decrease of loss with increasing pitch, the formula does not account for the non-monotonous dependence of bend loss on helix pitch, observed experimentally. We present a simple empirical formula to account for the non-monotonic dependence. Finally, we study the influence of micro-bend loss, due to the surface roughness of the mandrels used in the experiments on the bending losses. While the effect of surface roughness can be neglected for the mandrels used in our experiments, its effect may become important in mandrels with higher surface roughness, especially at larger bend diameters.]]>3714354435564388<![CDATA[Fringe-Distortion-Correction for Polarized Low-Coherence Interferometry With Phosphor-Based LED]]>3714355735622640<![CDATA[Statistics of the Nonlinear Discrete Spectrum of a Noisy Pulse]]>3714356335701009<![CDATA[Widely Wavelength-Tunable Mode-Locked Fiber Laser Based on a 45°-Tilted Fiber Grating and Polarization Maintaining Fiber]]>3714357135785232<![CDATA[Polarization-Ring-Switching for Nonlinearity-Tolerant Geometrically Shaped Four-Dimensional Formats Maximizing Generalized Mutual Information]]>jointly optimized. When compared with polarization-multiplexed 8-ary quadrature-amplitude modulation (PM-8QAM), gains of up to 0.7 dB in signal-to-noise ratio are observed in the additive white Gaussian noise channel. For a long-haul nonlinear optical fiber system of 8,000 km, gains of up to 0.27 bit/4D-sym ($text{5.5}$% data capacity increase) are observed. These gains translate into a reach increase of approximately 16% (1,100 km). The proposed modulation format is also shown to be more tolerant to nonlinearities than PM-8QAM. Results with low-density parity-check codes are also presented, which confirm the gains predicted by the GMI.]]>3714357935911687<![CDATA[5G Trial Services Demonstration: IFoF-Based Distributed Antenna System in 28 GHz Millimeter-Wave Supporting Gigabit Mobile Services]]>3714359236015383<![CDATA[Continuous Fading Suppression Method for Φ-OTDR Systems Using Optimum Tracking Over Multiple Probe Frequencies]]>3714360236104480<![CDATA[On the Effect of Low Temperatures on the Maximum Output Power of a Coherent Erbium-Doped Fiber Amplifier]]>3714361136191118<![CDATA[Tunable Autler–Townes Splitting in Optical Fiber]]>x in the experiments. Both the theoretical analysis and the experimental results show that the transmission spectrum is remarkably adjustable due to the tunable ATS effect. The splitting modes of the developed device allow for an extra degree of freedom to respond to the sensing signal, which is important for ultra-sensitive sensing. The refractive index is accurately adjustable, providing for potential phase matching applications. In addition, the device can serve as either an ATS system or an FP cavity.]]>3714362036252505<![CDATA[Active Mid-Wave to Long-Wave Supercontinuum FTIR Sensor for Standoff Chemical Detection]]> μm and an M$^2$ < 1.4, from 3 < $lambda {}$ < 11 μm, to provide high brightness at the target. We measure scattering spectra from powder particles on soda-lime glass down to a concentration of 7.4 μg/cm$^2$ and show that they match theoretical spectra simulated via a Bobbert–Vlieger model. Unlike diffuse scattering measurements performed on commercial Fourier transform infrared spectrometers, this standoff sensor collects a numerical aperture of 0.0375 and received powers are four orders of magnitude lower than probe powers.]]>3714362636364962<![CDATA[All-Optical Tuning of Micro-Resonator Overlaid With MoTe<sub>2</sub> Nanosheets]]>2) has attracted renewed interest owing to their versatile applications, such as transistors, logic circuits, photovoltaic cells, photodetectors, sensors, and lasers. We demonstrate an all-optically tunable microfiber knot resonator (MKR) overlaid with MoTe_{2} nanosheets. The optical transmitted power (OTP), resonance wavelength, and extinction ratio of the MoTe_{2} coated MKR can be tuned using external incidence pump lasers (405, 450, and 660 nm). MKR with MoTe_{2} nanosheets has strong absorption in the visible regime and enhanced light–matter interaction, resulting in enhanced tuning efficiency. Assisted by thermo-optic effect and photon generated carriers, the intensity and the wavelength of the MKR can be simultaneously tuned. The tuning efficiencies of the OTP, resonance wavelength, and extinction ratio of the MKR are up to 0.5 dB/mW, 7.52 pm/mW, and 0.16 dB/mW, respectively. The response time is measured to be ∼3 ms. Theoretical simulations are performed for the MKR with and without MoTe_{2}, which agree well with the experimental results. The advantages of this device are all-optical tuning, easy fabrication, all-fiber content, high tuning efficiency, and fast response. This all-optical tunable MKR can find applications in all-optical circuitry, all-optical modulator, multi-dimensionally tunable optical devices, etc.]]>3714363736466236<![CDATA[Comparison of Different Period Digital Alloy Al<inline-formula><tex-math notation="LaTeX">${}_{text{0.7}}$</tex-math></inline-formula>InAsSb Avalanche Photodiodes]]>0.7InAsSb avalanche photodiodes grow as ternary–binary and binary–binary digital alloys. Their characteristics of ideality factor, activation energy, temperature-dependent excess noise, temperature stability, and impact ionization coefficients are compared.]]>3714364736544682<![CDATA[Light-Blocking Optical Alignment Rulers for Guiding Layer-by-Layer Integration]]>3714365536643377<![CDATA[Noise Performance Improvement of Broadband Discrete Raman Amplifiers Using Dual Stage Distributed Pumping Architecture]]>2 factor improvement and 1134 km reach extension versus a conventional single stage design for 18 × 120 Gb/s PM-QPSK transmission.]]>3714366536711009<![CDATA[Polarimetric Fiber-Optic Current Sensor With Integrated-Optic Polarization Splitter]]>3714367236781589<![CDATA[Linear and Nonlinear Noise Characterisation of Dual Stage Broadband Discrete Raman Amplifiers]]>3714367936881897