# Journal of Lightwave Technology

### Early Access Articles

Early Access articles are made available in advance of the final electronic or print versions. Early Access articles are peer reviewed but may not be fully edited. They are fully citable from the moment they appear in IEEE Xplore.

## Filter Results

Displaying Results 1 - 25 of 116
• ### Wavelength-selective Wide-angle Light Absorption Enhancement in Monolayers of Transition-Metal Dichalcogenides

Publication Year: 2018, Page(s): 1
| | PDF (760 KB)

The monolayers of transition-metal dichalcogenides (TMDs) supported by a periodic metal nano-groove array with a dielectric spacer are investigated both theoretically and numerically. Numerical results exhibit that an original Fabry-Perot (F-P) resonance in the nanogroove enables the high-efficiency absorption of light (up to 61.48%) in monolayer molybdenum disulfide (MoS2) and the realization of ... View full abstract»

• ### Femtosecond Laser-Inscribed High-Order Bragg Gratings in Large-Diameter Sapphire Fibers for High-Temperature and Strain Sensing

Publication Year: 2018, Page(s): 1
| | PDF (1157 KB)

Aiming for structural health monitoring applications in harsh environments, a high-order sapphire fiber Bragg grating (HO-SFBG) written with a femtosecond (fs) laser in a large-diameter sapphire fiber is demonstrated. The radial refractive index (RI) modulation area induced by scanning exposure is greater than 60% of the fiber cross-section area. The large mode overlapping area leads to a transmis... View full abstract»

• ### Real-Time Polarimetric Optical High-Voltage Sensor Using Phase Controlled Demodulation

Publication Year: 2018, Page(s): 1
| | PDF (2174 KB)

Modern smart grid designs demand reliable sensors throughout the power delivery systems, not only to monitor the quality of the electrical energy generated by different technologies (wind, solar, hydroelectric, thermoelectric, nuclear), but also as an integral part of the generation, transmission and distribution networks control systems. Laser polarimetric interferometry is a very suitable techni... View full abstract»

• ### Passively mode-locked ytterbium-doped fiber laser with cylindrical vector beam generation based on mode selective coupler

Publication Year: 2018, Page(s): 1
| | PDF (1149 KB)

We propose and demonstrate, for the first time to the best of our knowledge, a passively mode-locked ytterbium-doped fiber laser generating cylindrical vector beams (CVBs) using a mode selective coupler (MSC) as the transverse mode converter and splitter, and a semiconductor saturable absorber mirror (SESAM) for mode-locking. According to the coupling mode theory and the phase matching principle, ... View full abstract»

• ### Non-data-aided k-Nearest Neighbors Technique for Optical Fiber Nonlinearity Mitigation

Publication Year: 2018, Page(s): 1
| | PDF (1391 KB)

We experimentally demonstrate a low-complexity and zero-redundancy fiber nonlinearity mitigation technique in the 16-QAM and 64-QAM coherent optical communication systems based on the non-data-aided (ND) k-nearest neighbors (KNN) algorithm. We measured the BER performances of the 16-QAM and 64-QAM signals in the back-to-back case and in the single-mode-fiber transmission case and achieved notable ... View full abstract»

• ### Direct-Detection PDM-OFDM RoF System for 60-GHz Wireless MIMO transmission without Polarization Tracking

Publication Year: 2018, Page(s): 1
| | PDF (625 KB)

This work experimentally demonstrates a 60-GHz direct-detection PDM-OFDM system that does not require polarization tracking. The frequency offset of un-modulated optical carriers and a novel training symbol design enable the estimation of optical polarization mixing and wireless MIMO channels for signal demodulation. We also adopted an empty subcarrier to mediate noise enhancement. Simulation and ... View full abstract»

• ### Modelling nonlinearities in RF photonic links

Publication Year: 2018, Page(s): 1
| | PDF (520 KB)

We introduce an idealized model of a photonic link comprised of a Mach-Zehnder modulator, described by sinusoidal nonlinearity, and a photodiode, with a memoryless nonlinearity described by a Taylor expansion about the operation point. The model uses an unconventional expansion that simultaneously, vs. sequentially, incorporates both modulator and photodiode nonlinearities, truncates naturally at ... View full abstract»

• ### Ultra-Low-Noise Mode-Division Multiplexed WDM Transmission Over 100-km FMF Based on Second-Order Few-Mode Raman Amplifier

Publication Year: 2018, Page(s): 1
| | PDF (1613 KB)

We demonstrate, for the first time, an ultra-low- noise mode-division multiplexed transmission with 8 wavelength- division multiplexed channels over 100-km few-mode fiber based on second-order few-mode Raman amplifier. To minimize the mode dependent gain, two backward depolarized pumps at the wavelengths of 1455 nm (75 mW) and 1360 nm (1890 mW) are equally launched both into the LP11a and LP11b mo... View full abstract»

• ### Linearity Comparison of Silicon Carrier-Depletion-Based Single, Dual-Parallel, and Dual-Series Mach-Zehnder Modulators

Publication Year: 2018, Page(s): 1
| | PDF (2203 KB)

In this paper, a model is built to investigate the linearity of silicon carrier depletion based Mach-Zehnder modulators (MZMs). By approximating the nonlinear electro-optical response of PN junction with a fourth-order polynomial, the model quantitatively calculates the modulation linearity of three different MZM configurations that have been widely used in analog optical links, i.e., single, dual... View full abstract»

• ### Flexible-grid wavelength-selective switch based on silicon microring resonators with interferometric couplers

Publication Year: 2018, Page(s): 1
| | PDF (1738 KB)

In this paper, a kind of integrated flexible-grid wavelength-selective switch composed of reconfigurable add-drop silicon microring resonators with interferometric couplers is described in detail. Owing to tunable interferometric couplers, the proposed device is capable of realizing an increase in adjustable channel spacing for a given field coupling coefficient. By carefully controlling the path ... View full abstract»

• ### High-Temperature Insensitivity of 50 Gb/s 16-QAM-DMT Transmission by Using Temperature-Compensated Vertical-Cavity Surface-Emitting Lasers

Publication Year: 2018, Page(s): 1
| | PDF (1451 KB)

In this study, a 50-Gb/s 16-quadrature amplitude modulation discrete multi-tone (16-QAM-DMT) was applied to an 850-nm oxide-confined vertical-cavity surface-emitting laser (VCSEL) at various temperatures ranging from 25 to 85 °C. This study reports the highest bit rate for directly modulated VCSELs operating at 85 °C, in addition to demonstrating, for the first time, 16-QAM-DMT with ... View full abstract»

• ### Optimization of Photonic Crystal Polarization Handling Devices Using Trust Region Algorithms

Publication Year: 2018, Page(s): 1
| | PDF (1329 KB)

In this paper, the trust region optimization (TRO) techniques are used for the design of photonic crystal polarization handling devices. The trust region algorithms are based on quadratic surrogate models with no derivative requirements to replace the objective function in the optimization process. A new box constrained trust region (CTR) algorithm is employed for the first time to the best of our... View full abstract»

• ### Reflective Fiber-Optic Refractometer Using Broadband Cladding Mode Coupling Mediated by a Tilted Fiber Bragg Grating and an In-Fiber Mirror

Publication Year: 2018, Page(s): 1
| | PDF (768 KB)

A reflective fiber-optic refractometer based on broadband cladding-to-core recoupling for wide range of refractive index measurement is proposed and experimentally demonstrated. The sensing probe contains a tilted fiber Bragg grating (TFBG) together with an in-fiber “cladding” mirror upstream. The “cladding” mirror is made by a 0.3 μm thickness gold film with a t... View full abstract»

• ### Multi-Format Wired and Wireless Signals over Large-Core Plastic Fibers for In-home Network

Publication Year: 2018, Page(s): 1
| | PDF (1334 KB)

This paper presents successful simultaneous transmission of an IEEE802.11n 16-QAM 40 MHz WLAN, 9 bands 64-QAM LTE-A, and a baseband 1.7 Gb/s 4-PAM signal over 50 m of 1 mm core diameter graded-index polymethyl methacrylate plastic optical fiber. The optical link is an intensity modulation with direct detection link, using a Fabry Perot laser diode emitting visible light at 650 nm and a p-i-n silic... View full abstract»

• ### Mid-infrared Self-Similar Pulse Compression in a Tapered Tellurite Photonic Crystal Fiber and Its Application in Supercontinuum Generation

Publication Year: 2018, Page(s): 1
| | PDF (1232 KB)

In this paper, we design a tapered tellurite photonic crystal fiber (TTPCF) with nonlinear coefficient increasing along the propagation direction, and demonstrate the mid-infrared self-similar pulse compression of the fundamental soliton in such a TTPCF. When the variation of group-velocity dispersion, higher-order dispersion, higher-order nonlinearity, and linear loss are considered, a 1 ps pulse... View full abstract»

• ### Photonic-Assisted Intra-Pulse Parameters Measurement of Complex Microwave Signals

Publication Year: 2018, Page(s): 1
| | PDF (1152 KB)

Measurement on intra-pulse parameters of complex microwave signals within a wide frequency coverage is essential for radar and communication systems. In this paper, a photonic approach based on a dual-port Mach-Zehnder interferometer (MZI) configuration is proposed to measure the intra-pulse parameters of phase/frequency-coded microwave signals. In the proposed approach, a light wave is externally... View full abstract»

• ### Tunable self-injected Fabry-Perot laser diode coupled to an external high-Q Si3N4/SiO2 micro-ring resonator

Publication Year: 2018, Page(s): 1
| | PDF (1053 KB)

The fast-growing fields of coherent optical communications, LIDAR, etc. have huge demand for narrow linewidth lasers. While laboratory-scale lasers have high stability with narrow linewidth down to few Hz, they are usually in large size and unable to be integrated with chip-scale optical systems. In this paper, we develop a new on-chip semiconductor laser by introducing the Vernier effect and the ... View full abstract»

• ### Compact Phase Detector for Optical-Microwave Synchronization Using Polarization Modulation

Publication Year: 2018, Page(s): 1
| | PDF (1116 KB)

We propose and demonstrate a compact optical- microwave phase detector taking advantage of polarization modulation. The proposed polarization modulator-based phase detector (PolM-PD) shows 460-attosecond residual timing jitter integrated from 1 Hz to 100 kHz when synchronizing an 8-GHz dielectric resonator oscillator to a free-running 250-MHz mode-locked Erbium-doped fiber laser. The absolute sing... View full abstract»

• ### Optical fiber sensor based in-field structural performance monitoring of multi-layered asphalt pavement

Publication Year: 2018, Page(s): 1
| | PDF (1279 KB)

The durability, robustness and long-term stability of optical fiber based sensors applied to practical engineering have always been challenging problems. Refer to the embedded case in asphalt pavements, the situation becomes serious and feasible sensors with enhanced function are in high demand. Therefore, improved design to configure the quasi-distributed and distributed optical fiber sensors and... View full abstract»

• ### Analytical Solution of Amplitude Ratio in Optical Phase Quantization Based on Phase Sensitive Amplification

Publication Year: 2018, Page(s): 1
| | PDF (2415 KB)

A detailed derivation is presented for the analytical solution of the optimal amplitude ratio m between the signal and its harmonic for M level optical phase quantization of a signal with uniform phase distribution based on the phase sensitive amplification (PSA). A new method is proposed to evaluate the performance of phase quantization by calculating the first order absolute central moment of th... View full abstract»

• ### Fiber-Wrapped Mandrel Microphone for Low-Noise Acoustic Measurements

Publication Year: 2018, Page(s): 1
| | PDF (1072 KB)

A low-noise fiber optic microphone has been developed using a fiber-wrapped mandrel as the acoustic transducer. The microphone has an average sensitivity of 0.206 rad/Pa between acoustic frequencies of 50 Hz and 16 kHz and a minimum detectable pressure as low as 3 Pa/Hz$1/2$. The noise floor of the microphone approaches the thermal limit set by the length of fiber use... View full abstract»

• ### Design Rules of a Micro-Scale PT-Symmetric Optical Gyroscope using Group IV Platform

Publication Year: 2018, Page(s): 1
| | PDF (896 KB)

We propose an alternative readout scheme for the ultrasensitive gyroscope shown in [1], which uses the physics of the exceptional points of a PT-symmetric system to enhance the device sensitivity. In particular, we demonstrate that the full width at half maximum linewidth (ΔωFWHM) of the light exiting the ring resonator system is proportional to the square root of the rotation rate (... View full abstract»

• ### Photonic Generation and Transmission of Triangular and Square Waveforms With a Large Repetition Rate Tunable Range

Publication Year: 2018, Page(s): 1
| | PDF (2361 KB)

A photonic approach to generate and transmit triangular and square-shaped microwave waveforms with a large repetition rate tunable range is proposed and experimentally demonstrated using a dual-polarization quadrature phase-shift keying (DP-QPSK) modulator. The upper dual-parallel Mach-Zehnder modulator (DP-MZM) integrated in the DP-QPSK modulator, which is driven by a microwave signal, is properl... View full abstract»

• ### A Novel THz Half-wave Polarization Converter for Cross-Polarization conversions of Both Linear and Circular Polarizations and Polarization Conversion Ratio Regulating by Graphene

Publication Year: 2018, Page(s): 1
| | PDF (6346 KB)

Polarization converter is firstly proposed with the functions of simultaneously converting a linear polarization (LP) and circular polarization (CP) to their corresponding cross-polarizations, and polarization conversion ratio (PCR) of the converter with graphene strips is also controllable in this research. The reflection-type converter is designed based on a metasurface in the terahertz region. ... View full abstract»

• ### Interference Characterization in Downlink Li-Fi Optical Attocell Networks

Publication Year: 2018, Page(s): 1
| | PDF (1115 KB)

Wireless access to data using visible light, popularly known as light-fidelity (Li-Fi), is one of the key emerging technologies which promises huge bandwidths and data rates. In Li-Fi, the data is modulated on optical intensities and transmitted and detected using light-emitting-diodes (LED) and photodiodes respectively. A network of such LED access points illuminates a given region in the form of... View full abstract»

## Aims & Scope

The Journal of Lightwave Technology is comprised of original contributions, both regular papers and letters, covering work in all aspects of optical guided-wave science, technology, and engineering. Manuscripts are solicited which report original theoretical and/or experimental results which advance the technological base of guided-wave technology. Tutorial and review papers are by invitation only. Topics of interest include the following: fiber and cable technologies, active and passive guided-wave componentry (light sources, detectors, repeaters, switches, fiber sensors, etc.); integrated optics and optoelectronics; and systems, subsystems, new applications and unique field trials. System oriented manuscripts should be concerned with systems which perform a function not previously available, out-perform previously established systems, or represent enhancements in the state of the art in general.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Peter J. Winzer
Alcatel-Lucent Bell Labs