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Physics of electrically switched fiber Bragg gratings
KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
KTH, School of Information and Communication Technology (ICT), Centres, Kista Photonics Research Center, KPRC.
2008 (English)In: 2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS, 2008, 580-581 p.Conference paper, Published paper (Refereed)
Abstract [en]

The physics of electrically switched FBGs was studied in fibers with internal electrodes. Wavelength shifts due to mechanical effects (nanoseconds) and heat (milliseconds) depend quadratically on the electrical pulse voltage and linearly on pulse duration.

Place, publisher, year, edition, pages
2008. 580-581 p.
Keyword [en]
Electron optics, Quantum electronics, Electro-optics, Laser science, Pulse duration
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-24686ISI: 000260498400291Scopus ID: 2-s2.0-84898618013OAI: oai:DiVA.org:kth-24686DiVA: diva2:352720
Conference
Conference on Lasers and Electro-Optics, CLEO 2008, San Jose, CA, United States, 4 May 2008 through 9 May 2008
Note

QC 20100922

Available from: 2010-09-22 Created: 2010-09-22 Last updated: 2016-12-20Bibliographically approved
In thesis
1. Fibre Bragg Grating Components for Filtering, Switching and Lasing
Open this publication in new window or tab >>Fibre Bragg Grating Components for Filtering, Switching and Lasing
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Fibre Bragg gratings (FBGs) are key components for a vast number of applications in optical communication systems, microwave photonics systems, and optical sensors, etc. The main topic of this thesis is fibre Bragg grating fabrication and applications in direct microwave optical filtering, high speed switching and switchable dual-wavelength fibre lasers.

First, a brief overview is given about the photosensitivity in optical fibre, basic FBG fabrication techniques, the popular coupled-mode theory for describing fundamental characteristics of FBGs and the Transfer Matrix method for the numerical simulations of complex-structured FBGs.

An advanced FBG fabrication system based on the technique of multiple printing in fibre (with a continuous-wave source) has been used to write complex FBGs incorporating phase shifts, apodization and chirp.     

A single double-peaked superimposed grating working in reflection can be employed as a direct optical filter for millimetre-wave signals. Bit error rate measurements confirmed that the filter exhibited nearly on-off behaviour in the passband with a 3-dB bandwidth of 2 GHz for a central frequency of 20 GHz, as expected from the optical spectrum reflection. The presented technique can be used in radio-over-fibre systems or simultaneous up-conversion of ultra-wide band signals and filtering.

This thesis focused mostly on the research of two 4-cm long Hamming-apodized gratings written in side-hole fibres with internal electrodes. The temperature dependence measurements showed that the birefringence of the component increased with the temperature. Dynamic measurement has shown nanosecond full off-on and on-off switching. During the electrical pulse action, the grating wavelength was blue-shifted for the x-polarization and red-shifted for the y-polarization due to the mechanical stress. Both peaks subsequently experienced a red-shift due to the relaxation of mechanical stress and the increasing core temperature transferred from the metal in many microseconds. All the wavelength shifts of the two polarizations depend quadratically on the electrical pulse voltage and linearly on the pulse duration. Numerical simulations gave accurate description of the experimental results and were useful to understand the physics behind the birefringence switching.

Finally, two switchable dual-wavelength erbium-doped fibre lasers based on FBG feedback were proposed. In one method, an overlapping cavity for the two lasing wavelengths and hybrid gain medium in the fibre laser were introduced. Dual-wavelength switching was achieved by controlling the Raman pump power. The other method employed an injection technique and the dual-wavelength switching was controlled by the power of the injection laser. The switching time was measured to be ~50 ms. Detailed characteristics of the dual-wavelength switching in the two fibre lasers were experimentally studied and corresponding principles were physically explained.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. xvi, 91 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2008:14
Keyword
fibre Bragg grating, photosensitivity, apodization, chirp, phase-shift, microwave optical filtering
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-4896 (URN)
Public defence
2008-10-03, room N2, Electrum 3, Isafjordsgatan 28, Kista, 10:00 (English)
Opponent
Supervisors
Note
QC 20100922Available from: 2008-09-24 Created: 2008-09-17 Last updated: 2010-09-22Bibliographically approved

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Yu, ZhangweiMargulis, WalterFonjallaz, Pierre-YvesTarasenko, Oleksandr
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