EP 1153463 A4 20050216 - TUNABLE LASER TRANSMITTER WITH INTERNAL WAVELENGTH GRID GENERATORS
Title (en)
TUNABLE LASER TRANSMITTER WITH INTERNAL WAVELENGTH GRID GENERATORS
Title (de)
ABSTIMMBARER LASERSENDER MIT INTERNEN WELLENLÄNGENGITTER-ERZEUGERN
Title (fr)
EMETTEUR A LASER ACCORDABLE DOTE DE GENERATEURS DE GRILLES DE LONGUEUR D'ONDE
Publication
Application
Priority
- US 0004196 W 20000218
- US 12078099 P 19990219
- US 34234299 A 19990629
- US 15204299 P 19990902
- US 41895099 A 19991015
- US 9924137 W 19991015
Abstract (en)
[origin: WO0049689A1] The present invention provides a continuously tunable external cavity laser ECL with a compact form factor and precise tuning to a selected center wavelength of a selected wavelength grid. The ECL may thus be utilized in telecom applications to generate the center wavelengths for any channel on the ITU or other optical grid. The ECL does not require a closed loop feedback. A novel tuning mechanism is disclosed which provides for electrical or mechanical tuning to a known position or electrical parameter, e.g., voltage, current, or capacitance, with the required precision in the selected center wavelength arising as a result of a novel arrangement of a grid generator (226) and a channel selector (262). The grid generator (226) exhibits first pass bands which correspond to the spacing between the individual channels of the selected wavelength grid and a fineness which suppresses side band modes of the laser. The channel selector (262) exhibits second pass bands that are wider than the first pass bands. In an embodiment of the invention the second pass bands have a periodicity substantially corresponding with the separation between the shortest wavelength channel and the longest wavelength channel of the selected wavelength grid and a finesse which suppresses channels adjacent to the selected channel. The broad second pass bands of the channel selector reduce the sensitivity of the ECL to tuning variations about the selected channel, thus avoiding the requirement of a closed loop feedback system to control the channel selector (262).
IPC 1-7
IPC 8 full level
H01S 5/14 (2006.01); H01S 5/022 (2006.01); H01S 5/06 (2006.01); H01S 5/40 (2006.01)
CPC (source: EP)
H01S 5/141 (2013.01); H01S 3/1055 (2013.01); H01S 3/1062 (2013.01); H01S 5/02251 (2021.01); H01S 5/02325 (2021.01); H01S 5/0617 (2013.01); H01S 5/4087 (2013.01)
Citation (search report)
- [PX] EP 0930679 A2 19990721 - HEWLETT PACKARD CO [US]
- [A] US 5748316 A 19980505 - WAKABAYASHI OSAMU [JP], et al
- [A] WO 9740420 A1 19971030 - SECR DEFENCE BRIT [GB], et al
- [A] EP 0300640 A2 19890125 - AMERICAN TELEPHONE & TELEGRAPH [US]
- [X] KERSEY A D ET AL: "MULTI-ELEMENT BRAGG-GRATING BASED FIBRE-LASER STRAIN SENSOR", ELECTRONICS LETTERS, IEE STEVENAGE, GB, vol. 29, no. 11, 27 May 1993 (1993-05-27), pages 964 - 966, XP000372902, ISSN: 0013-5194
- [X] LEE K-S ET AL: "STABLE AND WIDELY TUNABLE DUAL-WAVELENGTH CONTINUOUS-WAVE OPERATIONOF A SEMICONDUCTOR LASER IN A NOVEL FABRY-PEROT GRATING-LENS EXTERNAL CAVITY", IEEE JOURNAL OF QUANTUM ELECTRONICS, IEEE INC. NEW YORK, US, vol. 33, no. 10, 1 October 1997 (1997-10-01), pages 1832 - 1838, XP000722272, ISSN: 0018-9197
- See references of WO 0049689A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 0049689 A1 20000824; AU 3859000 A 20000904; EP 1153463 A1 20011114; EP 1153463 A4 20050216
DOCDB simple family (application)
US 0004196 W 20000218; AU 3859000 A 20000218; EP 00917645 A 20000218