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    CLADDING EXCITATION FIBER
    2.
    发明专利
    CLADDING EXCITATION FIBER 失效

    公开(公告)号：JPH11223734A

    公开(公告)日：1999-08-17

    申请号：JP32872198

    申请日：1998-11-19

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DIGIOVANNI DAVID JOHN

    IPC: G02B6/02 ,  G02B6/024 ,  G02B6/036 ,  G02B6/10 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094

    Abstract: PROBLEM TO BE SOLVED: To generate both of deflection and double refraction of beams and to obtain a fiber which keeps polarized light and which is effective for laser application by controlling the refractive index of a circular outer cladding to be lower than the refractive index of an inner cladding. SOLUTION: The laser fiber 30 has a core 32 doped with rare earth elements surrounded by an asymmetric first inner cladding 34 and a second cladding 36. The inner cladding 34 consists of a material having a lower refractive index than that of the core 32 and consists of a non-doped silicate glass. The second cladding 36 consists of a material having a lower refractive index than that of the core 32 or the first inner cladding 34, and for example, a fluorinated silicate glass or bosilicate glass. By this structure, the stress induced region not only causes double refraction around the asymmetric region of the inner cladding 34 but generates deflection of beams to constitute the laser fiber 30 which reflects excitation light on the core 32.

    OPTICAL FIBER AMPLIFIER
    3.
    发明专利
    OPTICAL FIBER AMPLIFIER 失效

    公开(公告)号：JPH1056227A

    公开(公告)日：1998-02-24

    申请号：JP14678897

    申请日：1997-06-04

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DIGIOVANNI DAVID JOHN ,  GRUBB STEPHEN GREGORY ,  INNISS DARYL ,  JAMESON RALPH STEPHEN ,  WALKER KENNETH LEE

    IPC: G02B6/34 ,  G02B6/42 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10

    Abstract: PROBLEM TO BE SOLVED: To provide a fiber laser hindering laser oscillation at an undesired wavelength. SOLUTION: An multi-mode fiber 51 in the fiber laser 40 is placed between a diode laser 49 used to activate an active medium of the fiber laser 40 and the fiber laser 40 used for an optical source. The multi-mode fiber part 51 reduces dramatically the intensity of the fiber laser beam made incident onto the diode laser 49 thereby increasing the reliability of the fiber laser 40. Furthermore, the multi-mode fiber part 51 reduces considerably an undesired wavelength so that the laser oscillation of the fiber laser 40 reaches its threshold value. When the fiber laser 40 is used for a source of a pump light in an FAMP, an adverse effect of multi-path interference MPI can be reduced.

    ARTICLE HAVING FIBER RAMAN DEVICE
    4.
    发明专利
    ARTICLE HAVING FIBER RAMAN DEVICE 失效

    公开(公告)号：JP2001066650A

    公开(公告)日：2001-03-16

    申请号：JP2000230391

    申请日：2000-07-31

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： INNISS DARYL ,  DIGIOVANNI DAVID JOHN ,  JAMESON RALPH STEPHEN ,  GREENBERG KOSINSKI SANDRA

    IPC: G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/0933 ,  H01S3/094 ,  H01S3/30

    Abstract: PROBLEM TO BE SOLVED: To realize an article having a fiber Raman device that is pumped by light from seven or more pump LEDs (for example from fourteen pump LEDs). SOLUTION: The Raman device 10 is equipped with a silica type optical fiber 12 comprising at least a first and a second wavelength selective elements 13, 141 arranged to provide one or more light cavities to Raman shift light in the optical fiber 12, a first coupler to couple pumped light having a first wavelength λ1 from a first pump light source 11 with the optical fiber 12, a means to provide an outgoing light utilizing means with Raman shifted Raman device outgoing light having a wavelength λ0 higher than λ1 and a second coupler 21 to couple pumped light having a second wavelength λ2 from a second pump light source 111 with the optical fiber 12. Then λ2 is different from λ1 and λ0>λ2 is satisfied, and at least one out of the wavelength selective elements is off resonance with respect to at least one out of λ1 and λ2.

    FIBER LASER
    5.
    发明专利
    FIBER LASER 失效

    公开(公告)号：JPH11112070A

    公开(公告)日：1999-04-23

    申请号：JP22142698

    申请日：1998-08-05

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DIGIOVANNI DAVID JOHN

    IPC: G02B6/036 ,  C03C3/06 ,  C03C13/04 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/094 ,  H01S3/10 ,  G02B6/22

    Abstract: PROBLEM TO BE SOLVED: To provide a fiber laser wherein Δ of a core is kept low to prevent a rare earth dopant from re-crystallizing, for increased diameter of an effective core. SOLUTION: Relating to a certain length glass fiber comprising a core 21, a first clad layer 22, and a second clad layer 23, the composition of the core is: 0.1-2.0 mol.% of rare earth element; 0.2-3.0 mol.% of Ge; 0.5-8.0 mol.% of Al; 0.5-8.0 mol.% of P; and SiO2 of remaining portion, while the difference in index of refraction between the core 21 and the first clad layer 22 is 0.008 or less.

    OPTICAL WAVEGUIDE DEVICE
    9.
    发明专利
    OPTICAL WAVEGUIDE DEVICE 失效

    公开(公告)号：JP2000323769A

    公开(公告)日：2000-11-24

    申请号：JP2000130598

    申请日：2000-04-28

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DIGIOVANNI DAVID JOHN ,  LEGRANGE JANE DEBORAH

    IPC: G02B6/00 ,  H01S3/00 ,  H01S3/06 ,  H01S3/094

    Abstract: PROBLEM TO BE SOLVED: To provide a pump waveguide device in which a monitor is improved for measuring pump power. SOLUTION: A pump waveguide device that has a pump waveguide 14 and an active waveguide 13 is provided with a pump power monitor by placing an indicator waveguide 18, which has a core doped with a material sensitive to pump light, between a pump source 12 and the active waveguide 13. For example, a certain material emits fluorescence in response to the pump light, or absorbs the pump light to emit heat. As a result, pump power is measured accurately with fluorescence or heat from the indicator waveguide 18. Since fluorescence or heat is generated in the doped core, a measured value is sensitive to the pump power getting in the active waveguide 13, and not sensitive to fluctuation of mode dispersion.

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