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：BR0000354A

公开(公告)日：2000-10-31

申请号：BR0000354

申请日：2000-02-10

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHRAPLYVY ANDREW ROMAN ,  KALISH DAVID ,  EICHENBAUM BERNARD RAYNOND ,  EMERY GARY PATRICK ,  HABER JANICE BILECKY ,  KUMMER RAYMOND BRADFIELD

IPC: H04B10/02 ,  G02B6/26 ,  G02B6/28 ,  H04B10/17 ,  H04B10/18 ,  H04J14/00 ,  H04J14/02

Abstract: A high-capacity optical fiber network Ä100, 200Ü includes wavelength-division multiplexing (WDM) within the 1.4 micron ( mu m) wavelength region (i.e., 1335-1435 nm). Such a system includes optical fiber Ä130Ü whose peak loss in the 1.4 mu m region is less than its loss at 1310 nm. The optical fiber has a zero dispersion wavelength ( lambda 0) at about 1310 nm, and linear dispersion between about 1.5 and 8.0 ps/nm-km within the 1.4 mu m region. At least three WDM channels operate at 10 Gb/s in the 1.4 mu m wavelength region and have a channel separation of 100 GHz. In one illustrative embodiment of the invention, a broadcast television channel, having amplitude modulated vestigial sideband modulation, simultaneously operates in the 1.3 mu m region (i.e., 1285-1335 nm) and/or the 1.55 mu m region (i.e., 1500-1600 nm). In another embodiment of the invention, 16 digital data channels are multiplexed together in the 1.55 mu m region, each channel operating at about 2.5 Gb/s. Raman amplifiers Ä103, 113Ü are used for amplification in the 1.3 mu m and the 1.4 mu m wavelength regions, whereas an Erbium amplifier Ä123Ü is used for amplification in the 1.55 mu m wavelength region.

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.