We demonstrate the first single-mode optical fiber couplers made with ZBLAN fiber. Couplers are fabricated using a controlled tapering procedure enabling high reproducibility while limiting glass crystallization. A coupling ratio of up to 41%/59% in cross/through ports an excess loss 2.5 dB is obtained at wavelength 2.73 μm. In addition, stability coupler traces surface crystallization tested ambient atmosphere over period more than 90 days.

Abstract Mid-infrared (MIR) technologies are crucial for applications from chemical sensing to precision medical surgery. Effective polarization control is essential enhance the functionality of fiber systems. Current solutions in MIR primarily involve free-space devices and components. In this work, we take a step forward experimentally demonstrate conversion within soft glass fluoride chalcogenide fibers using commercially available in-line controller (PC). Our experiments single PC show...

Abstract We present a coherent supercontinuum (SC) spanning 1.1-3.9 µm wavelength range from propagation in three-stage cascade of nonlinear and dispersive fibers, including silica fiber, ZBLAN robust dispersion-engineered As2S3 microtaper. In the first stage made pump pulse undergoes soliton fission, creating fundamental that subsequently redshifts through SSFS to center 2.14 μm. second becomes higher order experiences round fission another would shift up 2.86 via SSFS. third stage,...

We report on self-injection locking in InGaN/GaN (blue/green) and InGaP/AlGaInP (red) visible-light laser diodes. The free-space optical feedback path was accomplished via an external mirror. effect of injection current, power ratio, cavity length the spectral linewidth modulation bandwidth lasers is investigated. Our results show that performance substantially improved. In particular, we achieved a significant increase ~57% (1.53-2.41 GHz) ~31% (1.72-2.26 bandwidth, ~9 (1.0-0.11 nm)...

Emerging applications in the mid-infrared (MIR) stimulate growth and development of novel optical light sources. Soliton self-frequency shift (SSFS) soft glass fiber currently shows great potential as an efficient approach toward generation broadly tunable femtosecond pulses MIR. In this work, we demonstrate a highly soliton source based on SSFS chalcogenide glass. We show simple fully fiberized system to generate these continuously Raman solitons over broad spectral range 2.047-2.667 µm,...

We demonstrate chalcogenide optical fiber couplers with a power-dependent coupling coefficient. The are designed and fabricated using an As2Se3 characterized at wavelength of 1938 nm, leading to critical power 126 W, the lowest ever reported for any coupler. These nonlinear enable all-optical switching will be useful passive mode-locking over wide range from telecommunication band mid-infrared.

We derive an analytical formulation of the Raman-induced frequency shift experienced by a fundamental soliton. By including propagation losses, self-steepening, and dispersion slope, resulting is high-order (HO) extension well-known Gordon’s formula for soliton self-frequency (SSFS). The HO-SSFS agrees closely with numerical results generalized nonlinear Schrödinger equation, but without computational complexity required computation time. useful tool design validation wavelength conversion...

Abstract Use of fly ash, silica fume, natural pozzolans, and blast-furnace slag in concrete is becoming increasingly common. Incorporation these materials improves the durability concrete. But as yet there are few quantitative data available on effect long-term corrosion steel reinforcement. Such will help technologists to select proper type produce dense impermeable withstand aggressive service environments. In this investigation, corrosion-resisting characteristics concretes made with two...

We report, to the best of our knowledge, first employment a self-injection locking scheme for demonstration tunable InGaN/GaN semiconductor laser diode. have achieved 7.11 nm (521.10-528.21 nm) tunability in green color with different injection currents and temperatures. The system exhibited mode spectral linewidth as narrow ∼69 pm side suppression ratio high ∼28 dB, maximum optical power ∼16.7 mW. In entire tuning window, extending beyond 520 nm, ≤100 pm, power, stable performance were...

Fiber-based wavelength converters employing soliton self-frequency shift (SSFS) are particularly attractive as tunable mid-infrared (MIR) sources due to their compact design and robust nature. Early attempts of conversion utilizing SSFS in the MIR spectral region involved cascading silica fluoride nonlinear fibers (NLFs). In this work, we take a step forward demonstrate cascade involving three types NLFs made different glasses, that is, silica, fluoride, chalcogenide (ChG). Due its high...

We formulate the energy conversion efficiency from a high-order soliton to fundamental solitons by including influence of interpulse Raman scattering in fission process. The proposed analytical formula agrees closely with numerical results generalized nonlinear Schrödinger equation as well experimental results, while resulting formulation significantly alters predicted Raman-independent inverse method. also calculate materials different gain profiles such silica, ZBLAN, and chalcogenide...

We present a soliton order preservation mechanism leading to broad tunability with high energy conversion efficiency (ECE) from fiber-based self-frequency shift (SSFS) system. Here, pulse compressing fiber, placed before the Raman shifting nonlinear fiber (NLF), acts as preserver. Thanks this passive mechanism, at input of NLF is preserved within 2.0 < <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</i> 2.3 despite ∼6.7-fold increase. The...

Single and multiple wavelength laser systems are presented that employ self-injection locked InGaN/GaN green diode in an external cavity configuration with a partially reflective mirror.A stable simultaneous locking of up to 4 longitudinal Fabry-Perot modes the system is demonstrated appreciable signal-to-noise-ratio (SNR) ~13 dB average mode linewidth ~150 pm.The multiwavelength spectrum exhibited flat-top emission nearly equal power distribution among analogous spacing ~0.5 nm.This first...

We demonstrate single-mode ZBLAN optical fiber couplers. A coupling ratio of 61%/39% is achieved with insertion loss 4.3 dB at a wavelength 2.7 µ m. Couplers are reproducible and remain stable over &gt; 180 days.

A novel 60 GHz dielectric resonator antenna (DRA) with wide circular polarization bandwidth is presented. The performance of a stair-like rectangular DRA x-shaped feeding slot, which fed printed ridge gap waveguide (PRGW) analyzed. has 10.9% circularly polarized (axial ratio <; 3 dB) and 28% matching (S11 -10 dB). PRGW technology ensures low loss mechanism no radiation losses.

Gas detection finds various industrial applications, and diverse techniques have been employed for this purpose. A recent addition to these methods involves leveraging hollow core photonic crystal fiber. Due the nature of its core, it can be filled with target gas sensing, allowing light pass through. This paper introduces a novel sensing technique utilizing evolution ultra short pulses in When ultra-short are introduced at one end, pulse propagates through fiber, but shape changes different...

Abstract We present an all-fiber coherent supercontinuum spanning the spectral range of 1.7–5.0 µ m from a cascade silica, ZBLAN, and chalcogenide (ChG) nonlinear fibers (NLFs). Coherence is maintained by combined use femtosecond pump pulses as well allowing deterministic broadening mechanism at every stage cascade. The enables avoiding modulation instability (MI) onset generation process thus prevent subsequent MI-seeded random noise. Once in NLF cascade, pulse instead converted into...

We demonstrate the first all-fluoride mid-infrared ring cavity laser, comprising a single-mode ZBLAN optical fiber coupler and an Er: gain fiber. The laser exhibits continuous-wave emission at wavelength of 2.7-2.8 μm.

We demonstrate the first proof of concept in-line polarization control using soft-glass fibers, crucial for mid-infrared applications. ZBLAN and hybrid As 2 S 3 fibers exhibit high extinction ratios (PER) 20.8 dB 19.8 dB, respectively.

We present an all-fiber supercontinuum source spanning over the spectral range of 1.2-3.9 µm from As 2 S 3 -polycarbonate hybrid microtaper. This is broadest obtained a robust polymer clad

We demonstrate the optimal design conditions of a soliton self-frequency shift (SSFS) based wavelength converter with pulse pre-compression. Sidelobes energy compressed high-order is partially recycled to maximize SSFS and conversion efficiency.