Kin Seng Chiang

article

Graphene-Based Ammonia-Gas Sensor Using In-Fiber Mach-Zehnder Interferometer

Ting Hao, Kin Seng Chiang

IEEE Photonics Technology Letters > 2017 > 29 > 23 > 2035 - 2038

A robust graphene-coated in-fiber Mach-Zehnder interferometer (MZI) formed with a pair of 3-dB long-period fiber gratings is proposed and demonstrated for ammonia (NH₃) gas sensing. The sensor operates on the principle of changing the phase of the cladding mode of a fiber through changing the conductivity of the graphene coating by adsorbed NH₃ molecules, which gives rise to a shift in the interference...

article

Horizontal Directional Coupler Formed With Waveguides of Different Heights for Mode-Division Multiplexing

Wei Ke Zhao, Kai Xin Chen, Jie Yun Wu, Kin Seng Chiang

IEEE Photonics Journal > 2017 > 9 > 5 > 1 - 9

We propose a horizontal directional coupler formed with two parallel waveguides of different heights. By breaking the symmetry in both the horizontal and the vertical direction, this directional coupler can be designed to allow us coupling between any two spatial modes of a few-mode waveguide, regardless of their symmetry properties, whereas a conventional directional coupler formed with planar waveguides...

chapter

Thermo-optic switchable mode multiplexer based on cascaded vertical waveguide directional couplers

Quandong Huang, Kin Seng Chiang, Wei Jin

2017 Opto-Electronics and Communications Conference (OECC) and Photonics Global Conference (PGC) > 1 - 2

2017 Opto-Electronics and Communications Conference (OECC) and Photonics Global Conference (PGC)

We design and fabricate a thermo-optic switchable three-mode (de)multiplexer with two cascaded vertical polymer-waveguide directional couplers. At 1550 nm, the switching power required is ∼20 mW and the response time is ∼3 ms.

chapter

Graphene-coated in-fiber Mach-Zehnder interferometer for ammonia gas sensing

Ting Hao, Kin Seng Chiang

2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR) > 1 - 2

2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

An in-fiber Mach-Zehnder interferometer formed by connecting a graphene-coated fiber section between two long-period fiber gratings is proposed and demonstrated for ammonia gas sensing. Our experimental sensor shows a sensitivity of ∼3.5 pm/ppm over the gas concentration range from ∼3 to ∼180 ppm.

article

Wide-Range pH Sensor Based on a Smart- Hydrogel-Coated Long-Period Fiber Grating

Satyendra Kumar Mishra, Bing Zou, Kin Seng Chiang

IEEE Journal of Selected Topics in Quantum Electronics > 2017 > 23 > 2 > 1 - 5

We report a fiber-optic sensor for pH measurement, which is a long-period fiber grating (LPFG) coated with smart hydrogel. When the pH of a solution that surrounds the hydrogel coating changes, the volume of the coating and hence its refractive index are changed, which results in a shift in the resonance wavelength of the LPFG. Our experimental sensor shows a sensitivity of ∼0.66 nm/pH over the pH...

chapter

Four-mode-selective photonic lantern based on two-layer polymer waveguide branches

Yunfei Wu, Kin Seng Chiang

2016 21st OptoElectronics and Communications Conference (OECC) held jointly with 2016 International Conference on Photonics in Switching (PS) > 1 - 3

2016 21st OptoElectronics and Communications Conference (OECC) / 2016 International Conference on Photonics in Switching (PS)

We design and fabricate a four-core photonic lantern with two-layer asymmetric polymer waveguide branches to spatially (de)multiplex the LP₀₁, LP_11a, LP_11b, and LP_21a modes. The device operates over the C+L band with negligible polarization dependence.

chapter

Grating-based mode converters fabricated by one-step photolithography

Wei Jin, Kin Seng Chiang

2016 21st OptoElectronics and Communications Conference (OECC) held jointly with 2016 International Conference on Photonics in Switching (PS) > 1 - 3

2016 21st OptoElectronics and Communications Conference (OECC) / 2016 International Conference on Photonics in Switching (PS)

We develop grating-based polymer-waveguide mode converters with a one-step photolithography process, which allows a grating to be formed anywhere on a waveguide. We demonstrate the flexibility of the process with LP₀₁-LP_11b and LP₀₁-LP_21a mode converters.

chapter

Five-mode multiplexer based on cascaded vertical directional couplers

Quandong Huang, Yunfei Wu, Wei Jin, Kin Seng Chiang

2016 IEEE Photonics Conference (IPC) > 119 - 120

2016 IEEE Photonics Conference (IPC)

We design and fabricate a three-dimensional polymer waveguide mode (de)multiplexer based on a series of cascaded vertical directional couplers. The device allows five spatial modes of a rectangular-core waveguide to be combined or separated spatially.

article

Surface-Plasmon-Resonance Refractive-Index Sensor With Cu-Coated Polymer Waveguide

Satyendra Kumar Mishra, Bing Zou, Kin Seng Chiang

IEEE Photonics Technology Letters > 2016 > 28 > 17 > 1835 - 1838

We propose a refractive-index sensor based on the principle of surface plasmon resonance (SPR) in a polymer channel waveguide coated with a copper (Cu) film. Our fabricated device using a 40-nm Cu film covered with a 10-nm silicon-dioxide protecting layer offers a maximum refractive-index sensitivity of

$\sim 45~\mu \text{m}$

/RIU for the refractive-index range from 1.5375 to 1.5515, which is far...

chapter

Mode filter based on graphene-embedded waveguide

Zeshan Chang, Kin Seng Chiang

2016 Optical Fiber Communications Conference and Exhibition (OFC) > 1 - 3

2016 Optical Fiber Communications Conference and Exhibition (OFC)

We propose a graphene-embedded waveguide structure for spatial-mode-filtering applications. Our experimental demonstration with a graphene film placed in a polymer two-mode waveguide core achieves a mode extinction ratio over 20dB against the fundamental TE mode.

article

Mode-Selective Characteristics of an Optical Fiber With a High-Index Core and a Photonic Bandgap Cladding

Ming-Yang Chen, Kin Seng Chiang

IEEE Journal of Selected Topics in Quantum Electronics > 2016 > 22 > 2 > 1 - 7

The modal characteristics of an optical fiber consisting of a high-index core and a photonic bandgap cladding surrounded by a high-index outer ring are investigated. The cladding of the fiber is formed with periodically arranged high-index rods that support cladding modes with effective indexes crowded over a narrow region above the bandgap. With this fiber structure, the core modes with effective...

article

Polarization Switching in a Mode-Locked Fiber Laser Based on Reduced Graphene Oxide

Lei Gao, Tao Zhu, Kin Seng Chiang, Wei Huang

IEEE Photonics Technology Letters > 2015 > 27 > 24 > 2535 - 2538

We present an experimental study of the polarization switching process in a passively mode-locked fiber laser that incorporates a highly nonlinear element formed by depositing reduced graphene oxide onto a fiber taper, which provides both saturable absorption effect and high nonlinearity. Increasing pump power, the laser moves from the self-pulsing mode to the rectangular-pulse mode and shows different...

article

Compact Three-Dimensional Polymer Waveguide Mode Multiplexer

Jiangli Dong, Kin Seng Chiang, Wei Jin

Journal of Lightwave Technology > 2015 > 33 > 22 > 4580 - 4588

We propose a compact three-dimensional waveguide mode (de)multiplexer based on the configuration of two collocated asymmetrical directional couplers, formed with two dissimilar single-mode cores placed alongside a central rectangular three-mode core in the horizontal and vertical directions, respectively. The waveguides are designed to allow the LP _11a and LP_11b modes of the central core to completely...

article

Breathers and ‘black’ rogue waves of coupled nonlinear Schrödinger equations with dispersion and nonlinearity of opposite signs

Jin Hua Li, Hiu Ning Chan, Kin Seng Chiang, Kwok Wing Chow

Communications in Nonlinear Science and Numerical Simulation > 2015 > 28 > 1-3 > 28-38

Breathers and rogue waves of special coupled nonlinear Schrödinger systems (the Manakov equations) are studied analytically. These systems model the orthogonal polarization modes in an optical fiber with randomly varying birefringence. Studies earlier in the literature had shown that rogue waves can occur in these Manakov systems with dispersion and nonlinearity of opposite signs, and that the criterion...

article

Widely Wavelength-Tunable Mode Converter Based on Polymer Waveguide Grating

Yu Yang, Kaixin Chen, Wei Jin, Kin Seng Chiang

IEEE Photonics Technology Letters > 2015 > 27 > 18 > 1985 - 1988

We design and fabricate a corrugated grating on a polymer waveguide for the realization of the conversion between the fundamental mode and the higher order mode. The transmission characteristics of the device are insensitive to the polarization state of the input light. Our typical fabricated device shows a mode conversion efficiency higher than 99% over a bandwidth of

$\sim 4$

nm and a temperature...

chapter

Mode multiplexer based on integrated horizontal and vertical polymer-waveguide directional couplers

Jiangli Dong, Wei Jin, Kin Seng Chiang

2015 Conference on Lasers and Electro-Optics (CLEO) > 1 - 2

2015 Conference on Lasers and Electro-Optics (CLEO)

We propose an integrated polymer-waveguide mode (de)multiplexer based on cascaded horizontal and vertical directional couplers for combining/separating the three lowest-order modes. Our experimental device shows crosstalks lower than −15.6 dB in the C-band.

chapter

Unidirectional coupling with two matched dielectric an metal long-period gratings along a polymer waveguide

Bing Zou, Kin Seng Chiang

2015 Conference on Lasers and Electro-Optics (CLEO) > 1 - 2

2015 Conference on Lasers and Electro-Optics (CLEO)

We propose a grating structure for the achievement of unidirectional coupling, which consists of two matched dielectric and metal long-period gratings. We verify our idea theoretically and experimentally with gratings formed along a polymer waveguide.

article

Lithium-Niobate Mach-Zehnder Interferometer With Enhanced Index Contrast by SiO₂ Film

Kai Xin Chen, Xue Peng Li, Yan Lin Zheng, Kin Seng Chiang

IEEE Photonics Technology Letters > 2015 > 27 > 11 > 1224 - 1227

An electro-optic tunable lithium-niobate (LN) waveguide Mach-Zehnder interferometer (MZI) is designed and fabricated with the annealed proton-exchange process. The MZI consists of a straight waveguide arm and a bent waveguide arm with a SiO₂ film deposited on the two sides. The residual stress generated by the SiO₂ film can enhance the index contrast of the bent waveguide arm and thus reduce the bending...

chapter

Broadband photonic lantern mode multiplexers based on multilayer polymer waveguides

Yunfei Wu, Kin Seng Chiang

2015 Opto-Electronics and Communications Conference (OECC) > 1 - 3

2015 Opto-Electronics and Communications Conference (OECC)

We demonstrate broadband photonic lantern mode multiplexers based on multilayer polymer waveguides to achieve spatial multiplexing of the LP01, LP11a, and LP11b modes. The devices are thermally stable and polarization-insensitive. The crosstalk in a typical fabricated device varies from −11 to −22 dB, depending on the input mode and the output core. Our mode multiplexers could find applications in...

chapter

Mode converter with sidewall-corrugated polymer waveguide grating

Wei Jin, Kin Seng Chiang

2015 Opto-Electronics and Communications Conference (OECC) > 1 - 3

2015 Opto-Electronics and Communications Conference (OECC)

We design and fabricate a sidewall-corrugated polymer waveguide grating to achieve conversion between the LP01 and LP11a modes. A typical fabricated device offers a conversion efficiency >99% with a bandwidth of 20 nm and a thermal-tuning sensitivity of −4.1 nm/°C over the S+C+L band. This mode converter could be integrated with other polymer waveguide devices to achieve advanced functions for...

INFONA - science communication portal

Search results for: Kin Seng Chiang

Graphene-Based Ammonia-Gas Sensor Using In-Fiber Mach-Zehnder Interferometer

Horizontal Directional Coupler Formed With Waveguides of Different Heights for Mode-Division Multiplexing

Thermo-optic switchable mode multiplexer based on cascaded vertical waveguide directional couplers

Graphene-coated in-fiber Mach-Zehnder interferometer for ammonia gas sensing

Wide-Range pH Sensor Based on a Smart- Hydrogel-Coated Long-Period Fiber Grating

Four-mode-selective photonic lantern based on two-layer polymer waveguide branches

Grating-based mode converters fabricated by one-step photolithography

Five-mode multiplexer based on cascaded vertical directional couplers

Surface-Plasmon-Resonance Refractive-Index Sensor With Cu-Coated Polymer Waveguide

Mode filter based on graphene-embedded waveguide

Mode-Selective Characteristics of an Optical Fiber With a High-Index Core and a Photonic Bandgap Cladding

Polarization Switching in a Mode-Locked Fiber Laser Based on Reduced Graphene Oxide

Compact Three-Dimensional Polymer Waveguide Mode Multiplexer

Breathers and ‘black’ rogue waves of coupled nonlinear Schrödinger equations with dispersion and nonlinearity of opposite signs

Widely Wavelength-Tunable Mode Converter Based on Polymer Waveguide Grating

Mode multiplexer based on integrated horizontal and vertical polymer-waveguide directional couplers

Unidirectional coupling with two matched dielectric an metal long-period gratings along a polymer waveguide

Lithium-Niobate Mach-Zehnder Interferometer With Enhanced Index Contrast by SiO₂ Film

Broadband photonic lantern mode multiplexers based on multilayer polymer waveguides

Mode converter with sidewall-corrugated polymer waveguide grating

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