# 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 61
• ### Quantum-safe Metro Network with Low-Latency Reconfigurable Quantum Key Distribution

Publication Year: 2018, Page(s): 1
| | PDF (12555 KB)

This paper reports a practical quantum-safe metro network, integrating optically-switched QKD systems with high speed reconfigurablility to protect classical network traffic. Quantum signals are routed by millisecond optical switches and secure keys are shared between any two endpoints or network nodes via low-latency reconfigurable connections. Efficient quantum encryption topologies between diff... View full abstract»

• ### Low-Complexity Residual Carrier Frequency Offset Mitigation Based on Spectrum Symmetry for CO-OFDM Systems

Publication Year: 2018, Page(s): 1
| | PDF (634 KB)

In this paper, a low-complexity residual carrier frequency offset compensation (RCFOC) approach based on spectrum symmetry is proposed for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. A closed-form expression of spectrum symmetry is derived, which shows the dependence of spectrum shape of carrier phase on the residual carrier frequency offset (RCFO). Compared with... View full abstract»

• ### 1.1 μm Femtosecond Laser Pulses Generation from 1.06 μm Self-Seeded Picosecond Coherent Raman Fiber Amplification and Frequency Shift

Publication Year: 2018, Page(s): 1
| | PDF (1111 KB)

Although the Raman fiber amplifiers are attractive for their unique advantages and various Raman fiber amplifiers in CW regime were built, there are a few fundamental limitations for short-pulsed Raman fiber amplifiers. In this paper, we present a theoretical and experimental study on a novel method termed picosecond (ps) coherent Raman fiber amplification, where the stimulated Raman scattering (S... View full abstract»

• ### The EML as Analogue Radio-over-Fiber Transceiver - a Coherent Homodyne Approach

Publication Year: 2018, Page(s): 1
| | PDF (1570 KB)

Analogue radio-over-fiber schemes avoid transmission overhead as they dismiss digitization and processing of radio signals at head- and tail-end of the mobile optical fronthaul. Typically laid out following an intensity-modulation / direct-detection methodology, such systems do not scale well in terms of optical spectral efficiency and sensitivity. Here I propose and experimentally demonstrate an ... View full abstract»

• ### Saturable Absorption Properties of ReS$_2$Films and Mode-locking Application Based on Double Covered ReS$_2$Micro-fiber

Publication Year: 2018, Page(s): 1
| | PDF (764 KB)

ReS$_2$films with different thickness were fabricated by a vacuum filtration from liquid exfoliated ReS$_2$suspension. The saturable absorption properties of these films were investigated by open-aperture Z-scan technique with a femtosecond laser. The saturable absorption coefficients$\alpha_{\rm{NL}}$and the... View full abstract»

• ### First-Order Forward and Backward Quasi-Phase Matched Second Harmonic Generation in Silicon-Organic Hybrid Structures

Publication Year: 2018, Page(s): 1
| | PDF (1342 KB)

We propose and design a high-efficiency forward and backward second harmonic generation (SHG) in nonlinear polymer filled silicon slot waveguide known as silicon-organic hybrid (SOH) waveguides. The spatial distribution of second.order nonlinearity,$\mathcal{X^{(2)}}$, of waveguide is altered by periodically poling of nonlinear polymer to achieve quasi-phase matching ... View full abstract»

• ### High Capacity Transmission with Few-Mode Fibers

Publication Year: 2018, Page(s): 1
| | PDF (2653 KB)

We experimentally investigate high-capacity fewmode fiber transmission for short and medium-haul optical links. In separate experiments, we demonstrate C + L band transmission of 283 Tbit/s over a single 30 km span and recirculating loop transmission of 159 Tbit/s over 1045 km graded-index three mode fiber. The first experiment reached a data-rate per fiber mode within 90% of the record data-rates... View full abstract»

• ### Optical Arbitrary Waveform Processing of Over 100 Spatial Channels for Optical Performance Monitoring

Publication Year: 2018, Page(s): 1
| | PDF (5325 KB)

We developed an optical processing platform that handles over 100 space-division-multiplexed (SDM) signals in the C-band. The device consists of free-space optics based on liquid crystal on silicon (LCOS) with a waveguide frontend. Thanks to the holographic wavefront modulation by the LCOS spatial light modulator, the device arbitrarily manipulates the optical amplitude and phase in the space and ... View full abstract»

• ### Chalcogenide-glass nested anti-resonant nodeless fibers in mid-infrared region

Publication Year: 2018, Page(s): 1
| | PDF (4567 KB)

We propose two types of chalcogenide-glass nested anti-resonant nodeless fibers (CNANFs) with 4 anti-resonant elements in which a smaller tube is nested. One type of CNANF theoretically achieves ultra-low loss of 2.6 dB/km at the wavelength of 10.6$\mu$m and can be used for the delivery of a high-power CO$_2$laser. The other CNANF is a po... View full abstract»

• ### In-Situ Detection of Small Biomolecule Interactions using a Plasmonic Tilted Fiber Grating Sensor

Publication Year: 2018, Page(s): 1
| | PDF (1197 KB)

We have proposed and experimentally demonstrated a plasmonic titled fiber Bragg grating based biosensor for in-situ detection of the small biomolecule, S-adenosyl-L-homocysteine (AdoHcy). The sensor can also monitor the molecule's interaction with the protein Set7 in real-time. The biosensor is made by coating a 50-nm-thick gold film over an 18$^\circ$tilted fiber Bra... View full abstract»

• ### Analytical Solution of Stage-dependent Bit Resolution of Full Parallel Variable Point FFTs for Real-time DSP Implementation

Publication Year: 2018, Page(s): 1
| | PDF (3089 KB)

Digital signal processing (DSP) is a major driving force for cost-effectively realizing “software-defined anything” required by future converged networks. The fast Fourier transform (FFT) is a fundamental building block of an overwhelming majority of those DSP algorithms. For practical real-time implementation, the logic resource usage reduction of FFT operations is critical for considerably decre... View full abstract»

• ### Strain sensitivity enhancement of a sensing head based on ZEONEX polymer FBG in series with silica fiber

Publication Year: 2018, Page(s): 1
| | PDF (1575 KB)

This work presents the use of a sensing device composed of an all ZEONEX-480R polymer fiber Bragg grating, in series with a silica fiber, for the control / enhancement of the strain sensitivity. The results show that the amount of strain imposed in the total gauge length is unequally distributed in each fiber section. The low Young's modulus and diameter of the polymer fiber employed, compared to ... View full abstract»

• ### Hybrid Integration of RF Photonic Systems

Publication Year: 2018, Page(s): 1
| | PDF (333 KB)

Radio-frequency (RF) photonics is demonstrating superior performance in communication systems using discrete components. As systems establish an upgrade path balancing challenging bandwidth requirements with size, weight and power constraints, the time is ripe to transition to a more efficient and cost-effective hybrid manufacturing technology. This technology has been applied to the construction ... View full abstract»

• ### Hybrid-Integration of SOA on Silicon Photonics Platform Based on Flip-Chip Bonding

Publication Year: 2018, Page(s): 1
| | PDF (1079 KB)

A precise flip-chip bonding (FCB) technology for indium phosphide semiconductor optical amplifiers (InP-SOAs) on a silicon photonics platform within less than ±1 μm alignment accuracy was developed. For efficient optical coupling and a relaxed alignment tolerance, the mode field on both the InP-SOAs and the Si waveguides was expanded by spot-size converters (SSCs). On the InP-SOAs, width-tapered S... View full abstract»

• ### Recent progress in liquid-crystal optical fibers and their applications in photonics

Publication Year: 2018, Page(s): 1
| | PDF (731 KB)

The aim of this paper is to review and demonstrate a recent progress in liquid-crystal optical fibers and their applications in photonics. The review starts from early works with classical optical fibers modified with liquid crystals and ends up with the latest achievements in the field of photonic liquid crystal fibers (PLCFs). Potential applications and future perspectives of PLCFs are shortly s... View full abstract»

• ### Towards Practical Kramers-Kronig Receiver: Resampling, Performance, and Implementation

Publication Year: 2018, Page(s): 1
| | PDF (507 KB)

The Kramers-Kronig (KK) receiver has recently drawn a great deal of attention due to its capability of retrieving the phase information from the directly-detected intensity waveforms. However, a technical challenge associated with the implementation of this attractive receiver is the high sampling rate of digital signal processing (DSP). Since nonlinear operations (such as logarithm and exponentia... View full abstract»

• ### Investigation of Four-Wave-Mixing Crosstalk in Phase-Sensitive Fiber Optical Parametric Amplifier

Publication Year: 2018, Page(s): 1
| | PDF (820 KB)

Four-wave-mixing (FWM) crosstalk in frequency nondegenerate phase-sensitive fiber optical parametric amplifiers (FOPAs) for wavelength-division-multiplexed (WDM) systems is investigated experimentally and theoretically. We analyze different FWM interactions that can generate significant crosstalk components in the signal band. Approximate expressions are developed for the FWM crosstalk to convenie... View full abstract»

• ### Design Optimization for Semiconductor Lasers with High-Order Surface Gratings having Multiple Periods

Publication Year: 2018, Page(s): 1
| | PDF (2107 KB)

Semiconductor lasers that use high-order surface gratings formed with etched slots have simple fabrication. Such gratings however increase loss and have a small free-spectral range which can increase threshold, lower slope efficiency and limit SMSR. In this paper, we look at the design of a grating and use 2, 3 and 4 period structures within a 37th order grating. At fixed temperature, a single per... View full abstract»

• ### Interplay of Probabilistic Shaping and the Blind Phase Search Algorithm

Publication Year: 2018, Page(s): 1
| | PDF (743 KB)

Probabilistic shaping (PS) is a promising technique to approach the Shannon limit using typical constellation geometries. However, the impact of PS on the chain of signal processing algorithms of a coherent receiver still needs further investigation. In this work we study the interplay of PS and phase recovery using the blind phase search (BPS) algorithm, which is widely used in optical communicat... View full abstract»

• ### A Mode-matching Method for 3D waveguides with PMLs combined with energy conservation

Publication Year: 2018, Page(s): 1
| | PDF (1065 KB)

We present an improved calculation for reflection and transmission coefficients in the context of a mode-matching method with optimization (MMM-O), which makes the results more reliable and accurate as the number of modes employed in the mode-matching method is increased. This method is successfully demonstrated in a series of waveguide structures. View full abstract»

• ### A miniature fiber-optic microphone based on annular corrugated MEMS diaphragm

Publication Year: 2018, Page(s): 1
| | PDF (6484 KB)

A miniature fiber-optic microphone (FOM) based on periodic corrugated micro-electro-mechanical-systems (MEMS) diaphragm has been developed in this work. A micro Fabry-Perot cavity is composed of a single-mode fiber end face and a MEMS diaphragm as an acoustic sensing structure. The achieved singal-to noise-ratio (SNR) of this microphone is 79.08 dB under the sound pressure of 37.76mPa at 1 kHz aco... View full abstract»

• ### Open-source Network Optimization Software in the Open SDN/NFV Transport Ecosystem

Publication Year: 2018, Page(s): 1
| | PDF (1668 KB)

Transport ecosystems that combine Software Defined Networking (SDN) and Network Function Virtualization (NFV) are characterized by an unprecedented network control and resource dynamicity. Manual optimization is unmanageable. In this context, open systems that manage and orchestrate SDN/NFV-enabled networks offer programming frameworks that abstract the low-level particularities in the data-plane ... View full abstract»

• ### Improved Lower Bounds on Mutual Information Accounting for Nonlinear Signal--Noise Interaction

Publication Year: 2018, Page(s): 1
| | PDF (188 KB)

In fiber-optic communications, evaluation of mutual information (MI) is still an open issue due to the unavailability of an exact and mathematically tractable channel model. Traditionally, lower bounds on MI are computed by approximating the (original) channel with an auxiliary forward channel. In this paper, lower bounds are computed using an auxiliary backward channel, which has not been previou... View full abstract»

• ### Analysis of Nyquist Pulse Shapes for Carrier-less Amplitude and Phase Modulation in Visible Light Communications

Publication Year: 2018, Page(s): 1
| | PDF (18657 KB)

This paper proposes and experimentally demonstrates, for the first time, two new candidate pulse shapes for carrier-less amplitude and phase modulation in the context of visible light communications. It is commonly accepted that the pulse shape at the heart of the Hilbert pair used to generate the required orthogonal signal spaces should be the square-root raised cosine. In this work, we introduce... View full abstract»

• ### Mueller matrix polarimetry - an emerging new tool for characterizing the microstructural feature of complex biological specimen

Publication Year: 2018, Page(s): 1
| | PDF (1310 KB)

Recently, as the emergence of new light sources, polarization devices and detectors, together with a prominent increase in data processing capability, polarization techniques find more and more applications in various areas, one of which is biomedicine. For probing the characteristic features of complex biomedical specimen, Mueller matrix polarimetry has demonstrated distinctive advantages. Muelle... 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

Editor-in-Chief
Peter J. Winzer
Nokia Bell Labs