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10 items by relevance
1 PhD Thesis

Liquid Crystal photonic Bandgap Fiber Devices

Wei, Lei

Technical University of Denmark — 2011

In this Ph.D. thesis, an experimental investigation of liquid crystal photonic bandgap (LCPBG) fiber devices and applications is presented. Photonic crystal fibers (PCFs) consist of a cladding microstructure with periodic index variations and a core defined by a defect of the structure

Year: 2011

Language: English

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2 Journal article

Integrated liquid crystal photonic bandgap fiber devices

Li, Kaiwei; Zhang, Ting; Zhang, Nan; Zhang, Mengying; Zhang, Jing; Wu, Tingting; et al. (5 more)

Frontiers of Optoelectronics — 2016, Volume 9, Issue 3, pp. 466-482

Liquid crystal photonic bandgap (LCPBG) fibers provide a versatile and robust platform for designing optical fiber devices, which are highly tunable and exhibit novel optical properties for manipulation of guided light. We review the research progress on design, fabrication and development

Year: 2016

Language: English

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3 Conference paper

Photolithography of thick photoresist coating in anisotropically etched V-grooves for electrically controlled liquid crystal photonic bandgap fiber devices

Wei, Lei; Khomtchenko, Elena; Alkeskjold, Thomas Tanggaard; Bjarklev, Anders Overgaard

Proceedings, Ofc — 2009, pp. 1-3

Thick photoresist coating for electrode patterning in anisotropically etched v-grooves is investigated. The photoresist coverage is compared with and without soft baking. Two-step exposure is applied for a complete exposure and minimizing the resolution loss.

Year: 2009

Language: English

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4 Journal article

Liquid crystal parameter analysis for tunable photonic bandgap fiber devices

Weirich, Johannes; Lægsgaard, Jesper; Wei, Lei; Alkeskjold, Thomas Tanggaard; Wu, Thomas X.; Wu, Shin-Tson; et al. (1 more)

Optics Express — 2010, Volume 18, Issue 5, pp. 4074-4087

permittivity is calculated and used in finite element mode simulations. The suitability of liquid crystal photonic bandgap fiber devices for filters, waveplates or sensors is highly dependent on the tunability of the transmission spectrum. In this contribution we investigate how the bandgap tunability

Year: 2010

Language: English

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5 Conference paper

Temperature influence on electrically controlled liquid crystal filled photonic bandgap fiber devices

Wei, Lei; Alkeskjold, Thomas Tanggaard; Bjarklev, Anders Overgaard

10th European Conference on Liquid Crystals — 2009

We experimentally investigate the temperature influence on electrically controlled liquid crystal filled photonic bandgap fiber device. The phase shift in the wavelength range 1520nm-1600nm for realizing quarter and half wave plates at different temperatures by applying a certain voltage

Year: 2009

Language: English

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6 Journal article

Electrically tunable Yb-doped fiber laser based on a liquid crystal photonic bandgap fiber device

Olausson, Christina Bjarnal Thulin; Scolari, Lara; Wei, Lei; Noordegraaf, Danny; Weirich, Johannes; Alkeskjold, Thomas Tanggaard; et al. (2 more)

Optics Express — 2010, Volume 18, Issue 8, pp. 8229-8238

We demonstrate electrical tunability of a fiber laser using a liquid crystal photonic bandgap fiber. Tuning of the laser is achieved by combining the wavelength filtering effect of a tunable liquid crystal photonic bandgap fiber device with an ytterbium-doped photonic crystal fiber. We fabricate

Year: 2010

Language: English

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7 Conference paper

A Dual-Function All-in-Fiber Device Based on Negative Dielectric Liquid Crystal Photonic Bandgap Fibers

Wei, Lei; Eskildsen, Lars; Weirich, Johannes; Scolari, Lara; Alkeskjold, Thomas Tanggaard; Bjarklev, Anders Overgaard

Asia Optical Fiber Communication & Optoelectronic Exposition and Conference — 2008, pp. 1-3

A dual-function all-in-fiber device based on negative dielectric liquid crystal photonic bandgap fibers is presented. This device can work both as an electrically tunable waveplate in the range 1520nm-1580nm, and as a polarimeter at 1310nm.

Year: 2008

Language: English

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8 Journal article

On-chip tunable long-period grating devices based on liquid crystal photonic bandgap fibers

Wei, Lei; Weirich, Johannes; Alkeskjold, Thomas Tanggaard; Bjarklev, Anders Overgaard

Optics Letters — 2009, Volume 34, Issue 24, pp. 3818-3820

We design and fabricate an on-chip tunable long-period grating device by integrating a liquid crystal photonic bandgap fiber on silicon structures. The transmission axis of the device can be electrically rotated in steps of 45° as well as switched on and off with the response time

Year: 2009

Language: English

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9 Journal article

Optically fed microwave true-time delay based on a compact liquid-crystal photonic-bandgap-fiber device

Wei, Lei; Xue, Weiqi; Chen, Yaohui; Alkeskjold, Thomas Tanggaard; Bjarklev, Anders

Optics Letters — 2009, Volume 34, Issue 18, pp. 2757-2759

An electrically tunable liquid-crystal, photonic-bandgap-fiber-device-based, optically fed microwave, true-time delay is demonstrated with the response time in the millisecond range. A maximum electrically controlled phase shift of around 70 degrees at 15 GHz and an averaged 12.9 ps true-time delay

Year: 2009

Language: English

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10 Conference paper

Compact optically-fed microwave true-time delay using liquid crystal photonic bandgap fiber device

Wei, Lei; Xue, Weiqi; Chen, Yaohui; Alkeskjold, Thomas Tanggaard; Bjarklev, Anders Overgaard

Proceedings, Slow and Fast Light — 2009

Electrically tunable liquid crystal photonic bandgap fiber device based optically-fed microwave true-time delay is demonstrated. A maximum ~60° phase shift and an averaged ~7.2ps true time delay are obtained over the modulation frequency range 1GHz-19GHz.

Year: 2009

Language: English

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