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    51.
    发明专利
    未知

    公开(公告)号：FR2701020B1

    公开(公告)日：1995-04-21

    申请号：FR9301034

    申请日：1993-02-01

    Applicant: CORNING INC

    Inventor： PRASSAS MICHEL ,  GRATEAU LUC

    IPC: C03C3/11 ,  C03C4/06

    Abstract: A photochromic glass with the compsn. (wt.%, oxide basis) 52-58 SiO2, 16-21 B2O3, 6-9 Al2O3, 1.5-2.8 ZrO2, 2-3.5 Li2O, 0-2.5 Na2O, 4-8 K2O, 2-3.5 CaO and 1.2-2.5 TiO2, with 0.15-0.25 wt.% Ag, 0.06-0.13 wt.% Br, 0.25-0.40 wt.% Cl and 0.003-0.007 wt.% CuO as photochromic components and 2-10 ppm Au and up to 0.9% Er2O3 displays a pink hue in the darkened state, and bodies at 2 mm cross section have optical properties comprising: (i) luminous transmittance over 82% when undarkened, (ii) 20-32% and 35-55% darkened luminous transmittance after 15 min. exposure to actinic radiation at 25 deg. C and 40 deg. C respectively, (iii) a recovery of at least 30% in transmittance, to at least 50% transmittance, 5 min. after removal from exposure, and (iv) x and y trichromatic coordinates of 0.3500-0.3700 and 0.3250-0.3450 respectively.

    High index photochromic glasses
    52.
    发明专利
    High index photochromic glasses 未知

    公开(公告)号：HK148094A

    公开(公告)日：1995-01-06

    申请号：HK148094

    申请日：1994-12-30

    Applicant: CORNING INC

    Inventor： PRASSAS MICHEL

    IPC: C03C3/064 ,  C03C3/066 ,  C03C3/068 ,  C03C3/093 ,  C03C3/095 ,  C03C3/11 ,  C03C4/06

    Abstract: The present invention is related to transparent, fast darkening and fading photochromic glasses. The glasses contain SiO2, B2O3, Al2O3, ZrO2, Li2O, Na2O, K2O, MgO, CaO, SrO, BaO, ZnO, La2O3, Nb2O5, TiO2 as base glass components, Ag, Br, Cl, CuO as photochromic elements, with, optionally Sb2O3, As2O3, and SnO2 as colorants to impart a brown color at darkening. The glasses have a refractive index greater than 1.585, an Abbe number greater than 42, and a density lower than about 2.80 g/cm .

    FAST FADING PHOTOCHROMIC GLASS
    53.
    发明专利
    FAST FADING PHOTOCHROMIC GLASS 未知

    公开(公告)号：CA1270689A

    公开(公告)日：1990-06-26

    申请号：CA513455

    申请日：1986-07-10

    Applicant: CORNING INC

    Inventor： MAZEAU JEAN-PIERRE ,  PRASSAS MICHEL

    IPC: C03C3/11 ,  C03C3/093 ,  C03C3/097 ,  C03C3/118 ,  C03C4/04 ,  C03C4/06

    Abstract: This invention is directed to transparent photochromic glasses that can darken to a comfort range, i.e., between about 35-60%, or to a dark range, i.e., below 35%, depending upon glass composition, and will exhibit a faded transmittance after five minutes' removal from actinic radiation higher than 70%. The base compositions of the glasses consist essentially, in weight percent, of about SiO2 46-60 MgO 0-3.5 B2O3 16-28 CaO 0-6 Al2O3 4-11 SrO 0-6 ZrO2 2-6 BaO 0-6 Al2O3+ZrO2 6-13 MgO+CaO+SrO+BaO 0-7 Li2O 2-5 P2O5 0-5 Na2O 0-4 TiO2 0-3 K2O 2.5-9 For a comfort glass the photochromic elements consist essentially, as analyzed, of Ag 0.13-0.18 Br 0.08-0.14 Cl 0.16-0.34 CuO 0.001-0.004 For a dark glass the photochromic elements consist essentially, as analyzed, of Ag 0.15-0.3 Br 0.07-0.14 Cl 0.2-0.45 CuO 0.004-0.016

    57.
    发明专利
    未知

    公开(公告)号：DE69806785T2

    公开(公告)日：2003-02-13

    申请号：DE69806785

    申请日：1998-08-12

    Applicant: CORNING INC

    Inventor： JACOB DAVID ,  PRASSAS MICHEL

    IPC: G02B27/28 ,  H01S3/06 ,  H01S3/10 ,  H04B10/291 ,  H04B10/297 ,  H04J14/02 ,  H04N7/22 ,  H04B10/17 ,  H04B10/207

    Abstract: There is proposed an optical amplifier apparatus particularly for use in networks distributing signals by optical fibers, comprising first and second parallel optical branches (1, 2), the first optical branch (1) including optical amplifier means (5, 6) for amplifying digital signals and the second optical branch including optical amplifier means (7) for amplifying analogue signals, the optical amplifier means (5, 6) of the first optical path (1) being adapted to amplify bi-directional digital signals and the optical amplifier means (7) of the second optical branch (2) being adapted to amplify unidirectional analogue signals.

    58.
    发明专利
    未知

    公开(公告)号：DE69619682T2

    公开(公告)日：2002-10-31

    申请号：DE69619682

    申请日：1996-08-07

    Applicant: CORNING INC

    Inventor： PRASSAS MICHEL ,  KERDONCUFF ALAIN ,  GILLE FRANCOIS

    IPC: C03B19/02 ,  C03B17/02 ,  C03B32/00 ,  C03B37/012 ,  C03B17/06 ,  C03B13/10

    Abstract: PCT No. PCT/US96/12916 Sec. 371 Date Feb. 13, 1998 Sec. 102(e) Date Feb. 13, 1998 PCT Filed Aug. 7, 1996 PCT Pub. No. WO97/09278 PCT Pub. Date Mar. 13, 1997The present invention relates to a method of making a rectangular bar have a gradient composition. In optical or ophthalmic applications, the gradient of composition ensures formation of a corresponding gradient of optical property, such as refractive index or optical density. The glass material is manufactured using a device containing several reservoirs, all designed to contain glass in the fluid state. According to the invention, the composition of the glass varies from one reservoir to the other so that the refractive indices, for example, of the three compositions are different, with an incremental progression. The fluid glass is deposited one composition on top of the next and then heated, creating a certain degree of interdiffusion between the layers. The glass is then heat-treated to create the desired property profile.

    Glass for high and flat gain 1.55 um optical amplifiers
    59.
    发明专利
    Glass for high and flat gain 1.55 um optical amplifiers 未知

    公开(公告)号：AU734647B2

    公开(公告)日：2001-06-21

    申请号：AU9104098

    申请日：1998-08-12

    Applicant: CORNING INC

    Inventor： PRASSAS MICHEL

    IPC: C03C3/247 ,  C03C4/00 ,  C03C4/12 ,  H01S3/06 ,  H01S3/067 ,  H01S3/16 ,  H01S3/17 ,  H01S3/00 ,  C03C3/23

    Abstract: The invention relates to a family of erbium-doped fluorophosphate glasses for use in optical signal amplification. The composition, based on 100 parts by weight, is constituted by: P2O5 15-40, A12O3 0-5, MgO 0-9, CaO 0-9, SrO 0-9, BaO 0-45, AlF3 5-25, MgF2 0-10, CaF2 0-25, SrF2 0-25, BaF2 0-20, KHF2 0-2, K2TiF6 0-2, with up to 10 parts by weight of erbium oxide. The glasses according to the present invention exhibit a high gain and a very flat spectrum over the 1550 nm bandwidth, as compared to the glasses of the figure. These glass compositions are particularly well suited for use in fiber or planar optical amplification in WDM and similar applications.

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