Global Patent Index - EP 1488482 A4

EP 1488482 A4 20051123 - AMPLIFIERS AND LIGHT SOURCES EMPLOYING S-BAND ERBIUM-DOPED FIBER AND L-BAND THULIUM-DOPED FIBER WITH DISTRIBUTED SUPPRESSION OF AMPLIFIED SPONTANEOUS EMISSION (ASE)

Title (en)

AMPLIFIERS AND LIGHT SOURCES EMPLOYING S-BAND ERBIUM-DOPED FIBER AND L-BAND THULIUM-DOPED FIBER WITH DISTRIBUTED SUPPRESSION OF AMPLIFIED SPONTANEOUS EMISSION (ASE)

Title (de)

VERSTÄRKER UND LICHTQUELLEN MIT ERBIUM-DOTIERTER S-BAND-FASER UND THULIUM-DOTIERTER l-Band-FASER MIT VERTEILTER UNTERDRÜCKUNG UND VERSTÄRKTER SPONTANER EMISSION (ASE)

Title (fr)

AMPLIFICATEURS ET SOURCES LUMINEUSES A FIBRE DOPEE A L'ERBIUM EN BANDE S ET A FIBRE DOPEE AU THULIUM EN BANDE L A ELIMINATION REPARTIE D'EMISSION SPONTANEE AMPLIFIEE (ASE)

Publication

EP 1488482 A4 20051123 (EN)

Application

EP 03713958 A 20030307

Priority

  • US 0306971 W 20030307
  • US 9530302 A 20020308
  • US 16355702 A 20020605
  • US 19468002 A 20020712
  • US 34880203 A 20030121

Abstract (en)

[origin: WO03077381A2] The present invention provides an Erbium-Doped Fiber Amplifier (EDFA) and a source that employs the EDFA for generating light in an S-band of wavelengths. A fiber amplifier (10) in a depressed cladding or W-profile fiber has a core (12) doped with the active material (18) and defined by a core cross-section and a refractive index no. A depressed cladding (14) of index n1 surrounds the core (12) and a secondary cladding (16) of index n2 surrounding the depressed cladding (14). The fiber amplifier is pumped a level of high relative inversion D, such that the active material exhibits positive gains in a short wavelength band and high gains in a long wavelength band. In one embodiment, the core cross-section, the depressed cladding cross-section and the refractive indices no, n1, and n2 are selected to provide distributed ASE suppression at wavelengths longer than cutoff wavelength lambdc over the length of fiber amplifier (10). In another embodiment, such selection provides a roll-off loss curve about a cutoff wavelength lambdc. The roll-off loss curve yields losses at least comparable to the high gains in the long wavelength band and losses substantially smaller than the positive gains in the short wavelength band. To obtain the desired roll-off loss curve the refractive index no in the core is selected such that an effective index neff experienced by the confined mode maximizes a roll-off slope of the roll-off loss curve before the cutoff wavelength.

IPC 1-7

H01S 3/00; H01S 3/067

IPC 8 full level

G02B 6/036 (2006.01); H01S 3/06 (2006.01); H01S 3/067 (2006.01); H01S 3/10 (2006.01); H01S 3/08 (2006.01); H01S 3/16 (2006.01)

CPC (source: EP)

H01S 3/06758 (2013.01); H01S 3/06712 (2013.01); H01S 3/06716 (2013.01); H01S 3/0672 (2013.01); H01S 3/06729 (2013.01); H01S 3/06766 (2013.01); H01S 3/0677 (2013.01); H01S 3/06775 (2013.01); H01S 3/1608 (2013.01); H01S 3/1616 (2013.01); H01S 2301/02 (2013.01)

Citation (search report)

  • [DXY] US 6118575 A 20000912 - GRUBB STEPHEN G [US], et al
  • [Y] EP 0313209 A1 19890426 - BRITISH TELECOMM [GB]
  • [Y] US 5852690 A 19981222 - HAGGANS CHARLES W [US], et al
  • [A] US 6288835 B1 20010911 - NILSSON LARS JOHAN ALBINSSON [GB], et al
  • [Y] US 2001055456 A1 20011227 - ELLISON ADAM J G [US], et al
  • [PY] US 2002126971 A1 20020912 - SOUFIANE ABDELOUAHED [US]
  • [A] WO 0150639 A2 20010712 - CIT ALCATEL [FR], et al
  • [PY] EP 1246320 A2 20021002 - NIPPON TELEGRAPH & TELEPHONE [JP]
  • [A] WO 0101529 A1 20010104 - UNIV LEEDS [GB], et al
  • [DY] ISHIKAWA E ET AL: "Novel 1500 nm-band EDFA with discrete raman amplifier", OPTICAL COMMUNICATION, 2001. ECOC '01. 27TH EUROPEAN CONFERENCE ON SEPT. 30 - OCT. 4, 2001, PISCATAWAY, NJ, USA,IEEE, vol. 6, 30 September 2001 (2001-09-30), pages 48 - 49, XP010582870, ISBN: 0-7803-6705-7
  • [Y] COHEN LEONARD G ; MARCUSE DIETRICH ; MAMMEL WANDA L: "RADIATING LEAKY-MODE LOSSES IN SINGLE-MODE LIGHTGUIDES WITHDEPRESSED-INDEX CLADDINGS", IEEE J QUANTUM ELECTRON OCT 1982, vol. QE-18, no. 10, October 1982 (1982-10-01), pages 1467 - 1472, XP002323726
  • [Y] BROMAGE J ET AL: "A method to predict the Raman gain spectra of germanosilicate fibers with arbitrary index profiles", IEEE PHOTONICS TECHNOLOGY LETTERS IEEE USA, vol. 14, no. 1, January 2002 (2002-01-01), pages 24 - 26, XP002323727, ISSN: 1041-1135
  • [PX] ARBORE M A ET AL: "34dB GAIN AT 1500nm IN S-BAND EDFA WITH DISTRIBUTED ASE SUPPRESSION", ECOC 2002. 28TH. EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION. COPENHAGEN, DENMARK, SEPT. 8 - 12, 2002, EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION.(ECOC), vol. VOL. 1 OF 4 CONF. 28, 9 September 2002 (2002-09-09), pages 222 - 223, XP001158344
  • [XPYP] ARBORE M ET AL OPTICAL SOCIETY OF AMERICA / INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS: "S-band erblum-daped fiber amplifiers for WDM transmission between 1488 and 1508 not", OPTICAL FIBER COMMUNICATION CONFERENCE. (OFC). POSTCONFERENCE DIGEST. ATLANTA, GA, MARCH 23 - 28, 2003, TRENDS IN OPTICS AND PHOTONICS SERIES. (TOPS), WASHINGTON, DC : OSA, US, vol. TOPS. VOL. 86, 23 March 2003 (2003-03-23), pages 374 - 376, XP010680552, ISBN: 1-55752-746-6
  • [Y] JANG J N ET AL: "Effects of hydrogen molecule diffusion on LP0m mode coupling of long-period gratings", JOURNAL OF NON-CRYSTALLINE SOLIDS, NORTH-HOLLAND PHYSICS PUBLISHING. AMSTERDAM, NL, vol. 259, no. 1-3, 2 November 1999 (1999-11-02), pages 156 - 164, XP004364384, ISSN: 0022-3093
  • [Y] JACKSON S D ET AL: "Theoretical modeling of Tm-doped silica fiber lasers", JOURNAL OF LIGHTWAVE TECHNOLOGY IEEE USA, vol. 17, no. 5, May 1999 (1999-05-01), pages 948 - 956, XP002333644, ISSN: 0733-8724
  • [PY] AGGER S ET AL: "Single-frequency thulium-doped distributed-feedback fiber laser", OPTICS LETTERS OPT. SOC. AMERICA USA, vol. 29, no. 13, 1 July 2004 (2004-07-01), pages 1503 - 1505, XP002333645, ISSN: 0146-9592, [retrieved on 20050621]
  • [A] KASAMATSU T ET AL: "GAIN-SHIFTED DUAL-WAVELENGTH-PUMPED THULIUM-DOPED FIBER AMPLIFIER FOR WDM SIGNALS IN THE 1.48-1.51-MUM WAVELENGTH REGION", IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE INC. NEW YORK, US, vol. 13, no. 1, January 2001 (2001-01-01), pages 31 - 33, XP001025425, ISSN: 1041-1135
  • See references of WO 03077381A2

Designated contracting state (EPC)

DE FR GB IT

DOCDB simple family (publication)

WO 03077381 A2 20030918; WO 03077381 A3 20040819; AU 2003217981 A1 20030922; AU 2003217981 A8 20030922; CA 2478314 A1 20030918; EP 1488482 A2 20041222; EP 1488482 A4 20051123; JP 2005520326 A 20050707

DOCDB simple family (application)

US 0306971 W 20030307; AU 2003217981 A 20030307; CA 2478314 A 20030307; EP 03713958 A 20030307; JP 2003575476 A 20030307