公开(公告)号：JP2001287920A

公开(公告)日：2001-10-16

申请号：JP2001053269

申请日：2001-02-28

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DONG XIAOYUAN ,  HONG SIU-PING ,  MILLER THOMAS JOHN ,  SMITH DON H

IPC: G02B6/00 ,  C03B37/012

Abstract: PROBLEM TO BE SOLVED: To provide a method and an apparatus usable for the production of a larger overclad precursor without using an additional overclad step of RIT(rod-in-tube) method to improve the efficiency of the conventional RIT and ODD (overclad during drawing) method for the production of an MCVD optical fiber saving the processing time (and money). SOLUTION: The method for the production of the precursor comprises the positioning of the 1st overclad tube around a precursor core rod, the positioning of at least one 2nd overclad tube around the 1st overclad tube and the heating of the precursor core rod together with the overclad tubes under pressure to form the objective multiple overclad optical fiber precursor. The heating is carried out e.g. as a part of an overclad (ODD) treatment during the pulling action in a drawing tower furnace or in an independent heat-source before introducing the precursor into the drawing tower in a manner similar to the conventional rod-in-tube(RIT) treatment. The method includes the pulling of the optical fiber as a part of the precursor during the heating in the drawing tower furnace or with a heat-source separated from the drawing tower and the transfer to the drawing tower.

公开(公告)号：DE69800981T2

公开(公告)日：2002-04-04

申请号：DE69800981

申请日：1998-06-09

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHANG KAI HUEI ,  MILLER THOMAS JOHN ,  KALISH DAVID ,  PEARSALL MICHAEL L

IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03C25/10 ,  C03C25/12 ,  G02B6/02 ,  G02B6/036 ,  G02B6/16

Abstract: A singlemode optical fiber Ä700Ü having very low loss at 1385 nm, and a practical method for making same are disclosed. A core rod Ä20Ü is fabricated using vapor axial deposition to have a deposited cladding/core ratio (D/d) that is less than 7.5. The core rod is dehydrated in a chlorine- or fluorine-containing atmosphere at about 1200 DEG C to reduce the amount of OH present to less than 0.8 parts per billion by weight, and then consolidated in a helium atmosphere at about 1500 DEG C to convert the porous soot body into a glass. The consolidated core rod is elongated using an oxygen-hydrogen torch that creates a layer of OH ions on the surface of the rod that are largely removed by plasma etching. Finally, the core rod is installed in a glass tube Ä40Ü having a suitably low OH content. Thereafter, the tube is collapsed onto the rod to create a preform Ä60Ü. Conventional methods are employed for drawing an optical fiber from the preform and applying one or more protective coatings Ä75, 76Ü. The disclosed method is suitable for commercial production of low-OH fiber. Significantly, the fiber's loss at 1385 nm is reduced to a level that is less than its loss at 1310 nm, thereby rendering the entire wavelength region 1200 - 1600 nm suitable for optical transmission. In particular, wave-division-multiplex systems are now available to transmit optical signals over distances greater than 10 km in the wavelength region between 1360 nm and 1430 nm.

公开(公告)号：DE69800981D1

公开(公告)日：2001-08-02

申请号：DE69800981

申请日：1998-06-09

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHANG KAI HUEI ,  MILLER THOMAS JOHN ,  KALISH DAVID ,  PEARSALL MICHAEL L

IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03C25/10 ,  C03C25/12 ,  G02B6/02 ,  G02B6/036 ,  G02B6/16

Abstract: A singlemode optical fiber Ä700Ü having very low loss at 1385 nm, and a practical method for making same are disclosed. A core rod Ä20Ü is fabricated using vapor axial deposition to have a deposited cladding/core ratio (D/d) that is less than 7.5. The core rod is dehydrated in a chlorine- or fluorine-containing atmosphere at about 1200 DEG C to reduce the amount of OH present to less than 0.8 parts per billion by weight, and then consolidated in a helium atmosphere at about 1500 DEG C to convert the porous soot body into a glass. The consolidated core rod is elongated using an oxygen-hydrogen torch that creates a layer of OH ions on the surface of the rod that are largely removed by plasma etching. Finally, the core rod is installed in a glass tube Ä40Ü having a suitably low OH content. Thereafter, the tube is collapsed onto the rod to create a preform Ä60Ü. Conventional methods are employed for drawing an optical fiber from the preform and applying one or more protective coatings Ä75, 76Ü. The disclosed method is suitable for commercial production of low-OH fiber. Significantly, the fiber's loss at 1385 nm is reduced to a level that is less than its loss at 1310 nm, thereby rendering the entire wavelength region 1200 - 1600 nm suitable for optical transmission. In particular, wave-division-multiplex systems are now available to transmit optical signals over distances greater than 10 km in the wavelength region between 1360 nm and 1430 nm.

公开(公告)号：AU723038B2

公开(公告)日：2000-08-17

申请号：AU7196598

申请日：1998-06-18

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHANG KAI HUEI ,  KALISH DAVID ,  MILLER THOMAS JOHN ,  PEARSALL MICHAEL L

IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03C25/10 ,  C03C25/12 ,  G02B6/02 ,  G02B6/036 ,  C03B37/027 ,  G02B6/18

Abstract: A singlemode optical fiber Ä700Ü having very low loss at 1385 nm, and a practical method for making same are disclosed. A core rod Ä20Ü is fabricated using vapor axial deposition to have a deposited cladding/core ratio (D/d) that is less than 7.5. The core rod is dehydrated in a chlorine- or fluorine-containing atmosphere at about 1200 DEG C to reduce the amount of OH present to less than 0.8 parts per billion by weight, and then consolidated in a helium atmosphere at about 1500 DEG C to convert the porous soot body into a glass. The consolidated core rod is elongated using an oxygen-hydrogen torch that creates a layer of OH ions on the surface of the rod that are largely removed by plasma etching. Finally, the core rod is installed in a glass tube Ä40Ü having a suitably low OH content. Thereafter, the tube is collapsed onto the rod to create a preform Ä60Ü. Conventional methods are employed for drawing an optical fiber from the preform and applying one or more protective coatings Ä75, 76Ü. The disclosed method is suitable for commercial production of low-OH fiber. Significantly, the fiber's loss at 1385 nm is reduced to a level that is less than its loss at 1310 nm, thereby rendering the entire wavelength region 1200 - 1600 nm suitable for optical transmission. In particular, wave-division-multiplex systems are now available to transmit optical signals over distances greater than 10 km in the wavelength region between 1360 nm and 1430 nm.

公开(公告)号：CA2240220C

公开(公告)日：2003-04-29

申请号：CA2240220

申请日：1998-06-10

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHANG KAI HUEI ,  MILLER THOMAS JOHN ,  KALISH DAVID ,  PEARSALL MICHAEL L

IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03C25/10 ,  C03C25/12 ,  G02B6/02 ,  G02B6/036 ,  G02B6/16 ,  H04J14/02 ,  C03B23/047 ,  C03B23/057

Abstract: A singlemode optical fiber [700] having very low loss at 1385 nm, and a practical method for making same are disclosed. A core rod [20] is fabricate d using vapor axial deposition to have a deposited cladding/core ratio (D/d) that is less than 7.5. The core rod is dehydrated in a chlorine- or fluorine-containing atmosp here at about 1200.degree.C to reduce the amount of OH present to less than 0.8 part s per billion by weight, and then consolidated in a helium atmosphere at about 1500.degree.C to convert the porous soot body into a glass. The consolidated core rod is elongated using an oxygen-hydrogen torch that creates a layer of OH ions on the surface of the rod that are largely removed by plasma etching. Finally, the core rod is installed in a glass tube [40] having a suitably low OH content. Thereafter, the tube is collapse d onto the rod to create a preform [60]. Conventional methods are employed for drawing an optical fiber from the preform and applying one or more protective coatings [75, 76]. The disclosed method is suitable for commercial production of low-OH fiber. Significantly, the fiber's loss at 1385 nm is reduced to a level that is les s than its loss at 1310 nm, thereby rendering the entire wavelength region 1200 - 1600 nm su itable for optical transmission. In particular, wave-division-multiplexsystems are nowavailable to transmit optical signals over distances greater than 10 km in the wavelength region between 1360 nm and 1430 nm.

公开(公告)号：BR9816133A

公开(公告)日：2001-11-27

申请号：BR9816133

申请日：1998-06-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHANG KAI HUEI ,  KALISH DAVID ,  MILLER THOMAS JOHN ,  PEARSALL MICHAEL L

IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03C25/10 ,  C03C25/12 ,  G02B6/02 ,  G02B6/036 ,  G02B6/10

Abstract: A singlemode optical fiber Ä700Ü having very low loss at 1385 nm, and a practical method for making same are disclosed. A core rod Ä20Ü is fabricated using vapor axial deposition to have a deposited cladding/core ratio (D/d) that is less than 7.5. The core rod is dehydrated in a chlorine- or fluorine-containing atmosphere at about 1200 DEG C to reduce the amount of OH present to less than 0.8 parts per billion by weight, and then consolidated in a helium atmosphere at about 1500 DEG C to convert the porous soot body into a glass. The consolidated core rod is elongated using an oxygen-hydrogen torch that creates a layer of OH ions on the surface of the rod that are largely removed by plasma etching. Finally, the core rod is installed in a glass tube Ä40Ü having a suitably low OH content. Thereafter, the tube is collapsed onto the rod to create a preform Ä60Ü. Conventional methods are employed for drawing an optical fiber from the preform and applying one or more protective coatings Ä75, 76Ü. The disclosed method is suitable for commercial production of low-OH fiber. Significantly, the fiber's loss at 1385 nm is reduced to a level that is less than its loss at 1310 nm, thereby rendering the entire wavelength region 1200 - 1600 nm suitable for optical transmission. In particular, wave-division-multiplex systems are now available to transmit optical signals over distances greater than 10 km in the wavelength region between 1360 nm and 1430 nm.

公开(公告)号：CA2240220A1

公开(公告)日：1998-12-20

申请号：CA2240220

申请日：1998-06-10

Applicant: LUCENT TECHNOLOGIES INC

Inventor： KALISH DAVID ,  CHANG KAI HUEI ,  MILLER THOMAS JOHN ,  PEARSALL MICHAEL L

IPC: G02B6/00 ,  C03B37/012 ,  C03B37/014 ,  C03C25/10 ,  C03C25/12 ,  G02B6/02 ,  G02B6/036 ,  G02B6/16 ,  H04J14/02 ,  C03B23/047 ,  C03B23/057

Abstract: A singlemode optical fiber [700] having very low loss at 1385 nm, and a practical method for making same are disclosed. A core rod [20] is fabricate d using vapor axial deposition to have a deposited cladding/core ratio (D/d) that is less than 7.5. The core rod is dehydrated in a chlorine- or fluorine-containing atmosp here at about 1200.degree.C to reduce the amount of OH present to less than 0.8 part s per billion by weight, and then consolidated in a helium atmosphere at about 1500.degree.C to convert the porous soot body into a glass. The consolidated core rod is elongated using an oxygen-hydrogen torch that creates a layer of OH ions on the surface of the rod that are largely removed by plasma etching. Finally, the core rod is installed in a glass tube [40] having a suitably low OH content. Thereafter, the tube is collapse d onto the rod to create a preform [60]. Conventional methods are employed for drawing an optical fiber from the preform and applying one or more protective coatings [75, 76]. The disclosed method is suitable for commercial production of low-OH fiber. Significantly, the fiber's loss at 1385 nm is reduced to a level that is les s than its loss at 1310 nm, thereby rendering the entire wavelength region 1200 - 1600 nm su itable for optical transmission. In particular, wave-division-multiplexsystems are nowavailable to transmit optical signals over distances greater than 10 km in the wavelength region between 1360 nm and 1430 nm.