公开(公告)号：AU627636B2

公开(公告)日：1992-08-27

申请号：AU6760990

申请日：1990-11-30

Applicant: CORNING INC

Inventor： MILLER WILLIAM JAMES ,  TRUESDALE CARLTON MAURICE ,  WEIDMAN DAVID LEE ,  YOUNG DONALD RAY JR

IPC: G02B6/28 ,  G02B6/287 ,  G02B6/255 ,  G02B6/26

Abstract: An achromatic fiber optic coupler of the type wherein first and second single-mode optical fibers, each having a core and a cladding, are fused together along a portion of the lengths thereof to form a coupling region. A matrix glass of lower index than the fiber claddings surrounds the coupling region. The fiber diameters are smaller in the coupling region than in the the remainder of the fibers. The refractive index n2 of the cladding of the first fiber is different from the refractive index n'_2 of the cladding of the second fiber, the difference between the refractive indices n2 and n'_2 being such that the coupler exhibits very little change in coupling ratio with wavelength over a band of wavelengths.

公开(公告)号：AU626333B2

公开(公告)日：1992-07-30

申请号：AU4353789

申请日：1989-10-19

Applicant: CORNING INC

Inventor： NEWHOUSE MARK ANDREW ,  NOLAN DANIEL ALOYSIUS ,  WEIDMAN DAVID LEE

IPC: G02B6/14 ,  G02B6/26 ,  G02B6/42 ,  G02B6/38 ,  G02B6/36

Abstract: Disclosed is a mode field modifier (40) which can be used in a fiber-to-fiber connector or a source-to-fiber connector. In a downtaper-type mode field modifier embodiment, the modifier comprises a modifier core (42) of refractive index n1 surrounded by first and second cladding layers (44, 46) having refractive indices n2 and n3, respectively. In an uptaper-type mode field modifier (60) embodiment, the modifier comprises a modifier core (56) of refractive index n1 surrounded by a cladding layer (58) having a refractive index n2. The refractive indices are such that n1 > n2 > n3. In both embodiments, there is a nonadiabatic taper (N, N ) intermediate the ends of the mode field modifier, whereby a substantial amount of mode coupling occurs therein.