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Tunable Laser Module for Fibre Optic Communications ESPOO 2004 VTT PUBLICATIONS 528 VTT PUBLICATIONS 528 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 This thesis deals with the design, realisation, and testing of the wavelength 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 tunable 1540-nm laser prototypes that are intended for fibre optic 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 communications. The short external cavity laser uses an electrically 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 Tunable laser module for fibre optic communications 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 controlled silicon micromachined Fabry-Perot interferometer (FPI) device as 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 the tuning element. First, the most common techniques for the diode laser 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 wavelength tuning and applications for these devices are reviewed. Then 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 the ways of coupling laser power into the single-mode (SM) optical fibre are 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 considered and the characteristics of the fibre attachment methods are 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 studied. The design, assembly and testing of three prototypes is introduced. 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 Their discontinuous tuning spans range between 8 and 13 nm and their 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 output power between 100 and 570 µW. The modules produce multimode 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 tuning having an rms spectral width of about 1 nm. In addition, one 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 prototype is capable of single-mode tuning with a side mode suppression 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 ratio of 26 dB. The measured wavelength span is the widest reported single- 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 mode tuning range obtained from a short external cavity Fabry-Perot diode 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 laser without temperature tuning. The laser module can be electrically 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 modulated up to over 600 MHz. The test results show that the FPI-tuned 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 diode lasers can provide a cost-effective solution for optical communication 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 applications. The study also confirms that it is possible to realise the laser- 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890 to-SM-fibre coupling using adhesive bonding. Further studies are needed in order to improve the speed and repeatibility of the process together with the reliability of the fibre attachment. In addition, the operational and long- Veli Heikkinen term reliability of the module must be characterised. Tunable laser module for fibre optic communications Tätä julkaisua myy Denna publikation säljs av This publication is available from Veli Heikkinen VTT TIETOPALVELU VTT INFORMATIONSTJÄNST VTT INFORMATION SERVICE PL 2000 PB 2000 P.O.Box 2000 02044 VTT 02044 VTT FIN–02044 VTT, Finland Puh. (09) 456 4404 Tel. (09) 456 4404 Phone internat. +358 9 456 4404 Faksi (09) 456 4374 Fax (09) 456 4374 Fax +358 9 456 4374 ISBN 951–38–6375–1 (soft back ed.) ISBN 951–38–6376–X (URL: http://www.vtt.fi/inf/pdf/) ISSN 1235–0621 (soft back ed.) ISSN 1455–0849 (URL: http://www.vtt.fi/inf/pdf/) VTT PUBLICATIONS 528 Tunable laser module for fibre optic communications Veli Heikkinen VTT Electronics Academic Dissertation to be presented with the assent of the Faculty of Technology, University of Oulu, for public discussion in Raahensali (Auditorium L10), Linnanmaa, on June 7th, 2004, at 12 noon. ISBN 951–38–6375–1 (soft back ed.) ISSN 1235–0621 (soft back ed.) ISBN 951–38–6376–X (URL: http://www.inf.vtt.fi/pdf/) ISSN 1455–0849 (URL: http://www.inf.vtt.fi/pdf/) Copyright © VTT Technical Research Centre of Finland 2004 JULKAISIJA – UTGIVARE – PUBLISHER VTT, Vuorimiehentie 5, PL 2000, 02044 VTT puh. vaihde (09) 4561, faksi (09) 456 4374 VTT, Bergsmansvägen 5, PB 2000, 02044 VTT tel. växel (09) 4561, fax (09) 456 4374 VTT Technical Research Centre of Finland, Vuorimiehentie 5, P.O.Box 2000, FIN–02044 VTT, Finland phone internat. + 358 9 4561, fax + 358
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