公开(公告)号：AU653982B2

公开(公告)日：1994-10-20

申请号：AU1067392

申请日：1992-02-05

Applicant: CORNING INC

Inventor： HALL DOUGLAS WARREN ,  HAWK ROBERT MARTIN

IPC: G02B6/00 ,  G02B6/26 ,  G02B6/28 ,  G02B6/34 ,  H01S3/06 ,  H01S3/07 ,  H01S3/10 ,  H01S3/17 ,  G02B6/02 ,  G02F1/39

Abstract: The disclosed fiber optic filter structure includes an optical fiber having a single-mode core surrounded by cladding material, and at least one light-attenuating light path in the cladding material uniformly spaced from the single-mode core. The propagation constants of the single-mode core and the light path are different at wavelengths except for at least one wavelength lambda f. The spacing between the single-mode core and the light path are sufficiently small that light within a first band of wavelengths centered around lambda f couples between the single-mode core and the light path. At least a portion of the light within the first band of wavelengths is absorbed in the light path. In that embodiment in which the single-mode core is a fiber amplifier gain core, the filtering function of the light path modifies the fiber amplifier gain spectrum.

公开(公告)号：AU1067392A

公开(公告)日：1992-08-20

申请号：AU1067392

申请日：1992-02-05

Applicant: CORNING INC

Inventor： HALL DOUGLAS WARREN ,  HAWK ROBERT MARTIN

IPC: G02B6/00 ,  G02B6/26 ,  G02B6/28 ,  G02B6/34 ,  H01S3/06 ,  H01S3/07 ,  H01S3/10 ,  H01S3/17 ,  G02B6/02 ,  G02F1/39

Abstract: The disclosed fiber optic filter structure includes an optical fiber having a single-mode core surrounded by cladding material, and at least one light-attenuating light path in the cladding material uniformly spaced from the single-mode core. The propagation constants of the single-mode core and the light path are different at wavelengths except for at least one wavelength lambda f. The spacing between the single-mode core and the light path are sufficiently small that light within a first band of wavelengths centered around lambda f couples between the single-mode core and the light path. At least a portion of the light within the first band of wavelengths is absorbed in the light path. In that embodiment in which the single-mode core is a fiber amplifier gain core, the filtering function of the light path modifies the fiber amplifier gain spectrum.

公开(公告)号：AU5599090A

公开(公告)日：1990-12-06

申请号：AU5599090

申请日：1990-05-28

Applicant: CORNING INC

Inventor： BERKEY GEORGE EDWARD ,  HAWK ROBERT MARTIN

IPC: C03B37/027 ,  C03B37/028 ,  C03C25/10 ,  G02B6/024 ,  G02B6/04 ,  G02B6/10 ,  G02B6/255 ,  G02B6/26 ,  G02B6/28 ,  G02B6/44 ,  G02B6/16 ,  G02B6/02 ,  G02B6/38 ,  B29C55/30

Abstract: To fabricate polarization retaining couplers, the fibers must be kept untwisted and must be maintained parallel to one another, and the major axes of the polavitation-retaining single mode (PRSM) (115,116) fibers must be maintained substantially parallel to one another. It is noted that this orientation includes that orientation wherein the major axes are substantially coaxial. The method of the present invention is characterized in that the fiber coating material is utilized to facilitate the alignment of the major axes of the fibers. In a first described embodiment, each fiber is provided with a rectangularly shaped coating (117,118), and the two larger flattened sides of the coating are specifically oriented with respect to the major and minor axes of the PRSM fiber therein. Cores (141) and (143) of optical fibers (115) and (116), respectively, are elliptically-shaped, and the minor axis of each core is parallel to the long flat sides of the rectangularly-shaped coating. In one embodiment, tube (110) is heated and collapsed onto fibers (115) and (116) in a step that is separate from the step of stretching the midregion of tube (110). The flame from burner (129) is directed onto midregion (128) to heat glass tube (110) to its softening point. Burner (129) may remain stationary, or it may traverse midregion (128) in the direction toward vacuum source (126) as shown by arrow (130). It is an optional feature of the tube collapse step to apply a vacuum source to both hollow filaments (121) and (122), in which case the direction of burner traverse is immaterial. Midregion (128) becomes a solid region that is preferably free of air lines, bubbles, or the like.