METHODS FOR PRODUCING PREFORM AND OPTICAL FIBER

WIPO Patent Application WO/2000/026150

A1

A method for producing a preform capable of restricting deformation of each member during a production process, and a method for producing, using the preform, an optical fiber small in polarization mode dispersion. In the method for producing the preform, a collapse process is divided into at least two steps; a first step of forming a first collapse body by the collapse of a core rod member and a first clad tube member and a second step of forming a new collapse body by the collapse of the first collapse body and a second clad tube member. An obtained collapse body is drawn in at least the first step; and such a multi-stage collapse process and drawing of an obtained collapse body can reduce an outer diameter ratio of an outer-side member to an inner-side member to be collapsed and hardly produce deformation that would be caused by heating and the like at one time collapse.

WO2004106248

METHOD OF MAKING A PHOTONIC CRYSTAL PREFORM

IJIRI HIDEYUKI (JP)
UCHIYAMA KOUICHI (JP)
DANZUKA TOSHIO (JP)
KASHIWADA TOMONORI (JP)

PCT/JP1999/006046

May 11, 2000

October 29, 1999

Click for automatic bibliography generation  

SUMITOMO ELECTRIC INDUSTRIES (JP)
IJIRI HIDEYUKI (JP)
UCHIYAMA KOUICHI (JP)
DANZUKA TOSHIO (JP)
KASHIWADA TOMONORI (JP)

C03B37/012; C03C25/68; (IPC1-7): C03B37/012; C03B37/014

JPS62167235A	1987-07-23
JPH01160838A	1989-06-23
JPS6241733A	1987-02-23
JPH0656473A	1994-03-01
JPH06239637A	1994-08-30
JPS6033224A	1985-02-20
JPH0193433A	1989-04-12

Hasegawa, Yoshiki (Ginza 2-chome Chuo-ku Tokyo, JP)

View/Download PDF      PDF Help

Previous Patent: HIGH PERFORMANCE EMBEDDED RF FILTERS

Next Patent: BINDER SYSTEMS DERIVED FROM AMORPHOUS SILICA AND BASES