公开(公告)号：JPH11289133A

公开(公告)日：1999-10-19

申请号：JP4411199

申请日：1999-02-23

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LEGRANGE JANE DEBORAH ,  REED WILLIAM ALFRED ,  WALKER KENNETH LEE

IPC: G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/08 ,  H01S3/30 ,  H04B10/17

Abstract: PROBLEM TO BE SOLVED: To avoid the attenuation caused by multiple reflectors, by a method wherein multiple narrow band reflectors having reflecting power curve in the half maximum time full width larger than a pertinent Stokes shift are arranged so as to provide a plurality of wavelength with optical cavities. SOLUTION: In an optical fiber RAMAN device composed of an optical fiber 11 in a specific length, a pumpping source 12 and a set of narrow band reflectors 13, one each of wide band mirror 21 reflects all wavelengths entered thereinto. Next, pump radiation in wavelength of λp is led into the optical fiber 11 in a specific length to be selected to reflect the radiation in respective wavelengths λ1...λn, while the wavelength difference in every adjacent two wavelengths corresponds to a Stokes shift as well as a plurality of narrow band reflectors 13 of the device in n>=2 are provided with reflecting power curve respectively having the half maximum time full width not exceeding 20 nm. Furthermore, the wide band reflectors having the half maximum time full width larger than the Stokes shift are arranged so as to form the optical cavities in wavelength of λ1...ν.

公开(公告)号：JP2000214503A

公开(公告)日：2000-08-04

申请号：JP2000009590

申请日：2000-01-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： STENTZ ANDREW J ,  WALKER KENNETH LEE

IPC: G02F1/35 ,  H01S3/06 ,  H01S3/094 ,  H01S3/30 ,  H04B10/17 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02 ,  H04B10/16

Abstract: PROBLEM TO BE SOLVED: To realize a low noise, a long fiber span and low nonlinearity by providing one or plural high order dispersion Raman effect amplifiers on a poststage of a light source. SOLUTION: Plural Raman amplifiers 10 are provided on the poststage of a signal light source along a transmission line 12 over the whole length of the transmission line 12. The amplifier 10 is preferred to be provided on an end part of a middle of a continuous fiber segment. The usual high order Raman amplifier 10 is constituted of one or above of Raman pump light source 20A and one or above of secondary Raman pump light source 20B. The light sources 20A, 20B are usually semiconductor lasers connected with a thing such as a connector transmission line segment 21. These are connected in the fiber transmission lines 12 by a wavelength division multiplexing device 22. This advantage exists in a point that the cross talk is reduced through a pump beam by that a λP1 beam of a primary pump is propagated in opposite direction for a communication signal beam λS in the transmission line 12.

公开(公告)号：JPH1117263A

公开(公告)日：1999-01-22

申请号：JP16019698

申请日：1998-06-09

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LEGRANGE JANE DEBORAH ,  WALKER KENNETH LEE

IPC: G02B6/02 ,  G02B6/036 ,  G02B6/26 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  G02B6/16 ,  G02B6/22

Abstract: PROBLEM TO BE SOLVED: To prevent influence on the entire optical communication system by avoiding essential damage to a protective cover film of an optical fiber when at least residual light of specified wattage is transmitted from a pumping clad. SOLUTION: Residual light enters a clad 24 or protective cover film 18 of a single mode optical fiber 20 in interconnection of two fibers 10, 20 from a pumping clad 14 and directed into the film 18 because of its higher refractive index than the clad 24, residual power from a current fiber laser essentially will give damage enough to evaporate the protective film and influence on the entire optical communication system, and using a single mode film having a protective cover film made of a material durable to the light of at least one watt transmitted into the film 18 the influence on the entire optical communication system can be avoided.

公开(公告)号：JPH11147732A

公开(公告)日：1999-06-02

申请号：JP23675498

申请日：1998-08-24

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GLODIS PAUL FRANCIS ,  WALKER KENNETH LEE

IPC: G02B6/00 ,  C03B37/018 ,  C03B37/027

Abstract: PROBLEM TO BE SOLVED: To provide a process for drawing out a fiber from a preform having a large diameter, especially a process parameter capable of mass producing a high-quality fiber of low loss from a preform in producing an optical fiber from a perform having a large diameter. SOLUTION: A velocity passing through a neck down zone in drawing out a fiber from a glass of MCVD(modified chemical vapor deposition) preform is discovered to have a great influence on a prepared fiber. A relatively low loss which can not be obtained at a low velocity is obtained at >= about 20 g/minute velocity. A velocity at which a glass passes through a neck down zone is a velocity at which a preform glass passes through a plane which crosses the neck down zone and is orientated vertically to the longer axis of the preform and flows. A fiber having

公开(公告)号：JPH1174596A

公开(公告)日：1999-03-16

申请号：JP17949498

申请日：1998-06-26

Applicant: LUCENT TECHNOLOGIES INC

Inventor： WALKER KENNETH LEE ,  WILLEMS FREDERICK WILLEM

IPC: H01S3/10 ,  H01S3/06 ,  H01S3/17 ,  H04B10/17 ,  H04B10/29 ,  H04B10/16

Abstract: PROBLEM TO BE SOLVED: To provide a large-capacity multi-wavelength optical communication system, problematic with, especially, conventional technology, relating to a multi-wavelength optical fiber communication system comprising an optical fiber amplifier. SOLUTION: Relating to an optical fiber communication system (for example, 80) wherein irradiation is transferred with multiple wavelengths provided with a transmitter 81, a receiver 82, and a transfer channel 83 comprising an optical amplifier fiber with rare earth doped, after a pump irradiation passes the length of optical amplifier fiber, a fiber communication system is selected so that as least 70% of a provided pump irradiation power is not absorbed to the optical amplifier fiber.

公开(公告)号：JPH1056227A

公开(公告)日：1998-02-24

申请号：JP14678897

申请日：1997-06-04

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DIGIOVANNI DAVID JOHN ,  GRUBB STEPHEN GREGORY ,  INNISS DARYL ,  JAMESON RALPH STEPHEN ,  WALKER KENNETH LEE

IPC: G02B6/34 ,  G02B6/42 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10

Abstract: PROBLEM TO BE SOLVED: To provide a fiber laser hindering laser oscillation at an undesired wavelength. SOLUTION: An multi-mode fiber 51 in the fiber laser 40 is placed between a diode laser 49 used to activate an active medium of the fiber laser 40 and the fiber laser 40 used for an optical source. The multi-mode fiber part 51 reduces dramatically the intensity of the fiber laser beam made incident onto the diode laser 49 thereby increasing the reliability of the fiber laser 40. Furthermore, the multi-mode fiber part 51 reduces considerably an undesired wavelength so that the laser oscillation of the fiber laser 40 reaches its threshold value. When the fiber laser 40 is used for a source of a pump light in an FAMP, an adverse effect of multi-path interference MPI can be reduced.

公开(公告)号：JP2001077756A

公开(公告)日：2001-03-23

申请号：JP2000228339

申请日：2000-07-28

Applicant: LUCENT TECHNOLOGIES INC

Inventor： EGGLETON BENJAMIN JOHN ,  ROGERS JOHN A ,  STRASSER THOMAS ANDREW ,  WALKER KENNETH LEE

IPC: H04B10/02 ,  G02B6/00 ,  G02B6/02 ,  H04B10/18 ,  H04L1/00

Abstract: PROBLEM TO BE SOLVED: To obtain a system incorporating an automatic dispersion compensating module for compensating the variation of dispersion caused by temperature by including a feedback circuit for adjusting a dispersion compensating element so as to assure the integrity of data through the system. SOLUTION: This system consists of a high-speed light transmitter 10, a transmission fiber path 11 and a light receiver 12. Further, the system is provided with one or plural dispersion compensating modules 20. Each module 20 is provided with an adjustable dispersion compensator 30, a data integrity monitor 31 and a feedback network 32. The monitor 31 adjusts the compensator 30 so as to optimize system performance through the network 32. In this module, e.g. the compensator 30 is provided with an optical circulator 32 connected to a transmission fiber and an adjustable dispersion compensating grating(DCG) 33.

公开(公告)号：JPH11223744A

公开(公告)日：1999-08-17

申请号：JP32872398

申请日：1998-11-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： HEADLEY CLIFFORD ,  WALKER KENNETH LEE

IPC: G02B6/287 ,  G02B6/28 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/094 ,  H04B10/17 ,  H04B10/29 ,  H04B10/16

Abstract: PROBLEM TO BE SOLVED: To prevent self-excited pulse oscillation and a large noise by adding a conventional fiber laser in a single mode, which has a certain length and doesn't include rare-earth elements, to a laser cavity resonator to extend the length of the laser cavity resonator. SOLUTION: Radiation from an exciting laser 11 is transmitted to a cladding excitation fiber 20 dopes with ytterbium through a multiple mode fiber 16. The fiber 20 is provided with a single mode core 21 and is doped with ytterbium. The optical fiber in the single mode which doesn't include rare-earth elements is added to the laser cavity resonator to extend the length of the laser cavity resonator so that the distance between the terminal on the lower end side of the optical fiber doped with rare-earth elements and an output coupler may be extended. A length A of the optical fiber in the single mode which is provided between the optical fiber doped with rare-earth elements and a second reflector and doesn't include rare-earth elements is >0.3 L, preferably, >0.5 L (L is the effective length of the laser cavity resonator).

公开(公告)号：JPH1062646A

公开(公告)日：1998-03-06

申请号：JP11553497

申请日：1997-05-06

Applicant: LUCENT TECHNOLOGIES INC

Inventor： NELSON KATHERINE THERESA ,  REED WILLIAM ALFRED ,  WALKER KENNETH LEE ,  WHITE IAN ARTHUR

IPC: G02B6/036 ,  G02B6/00 ,  G02B6/02 ,  G02B6/26 ,  G02B6/293 ,  G02B6/34 ,  G02B6/42 ,  H04B10/00 ,  H04B10/08 ,  H04B10/22 ,  H04B10/24

Abstract: PROBLEM TO BE SOLVED: To realize an optical fiber communication system by which even the function not available hitherto because of deficient cost efficiency can be provided, by utilizing fiber filters simply and at low cost, so that the cost of the system can be reduced. SOLUTION: An optical fiber communication system is provided with a first radiation source 41 of a first wavelength λ1 , a utilization means of the radiation source such as a receiver 46, first optical fiber transmission passages 44, 48 for connecting the first radiation source 41 with the utilization means 46, a second radiation source 42 of a second wavelength λ , a utilization means 47 of the radiation source of the second wavelength, and second optical fiber transmission passages 44, 49 for connecting the second radiation source 42 with the utilization means 47. The first part 44 of the first optical fiber transmission passages 44, 48 is included in the second optical fiber transmission passage. The system is further provided with an optical filter 48 that ejects nearly all the radiation of the second wavelength from the second part of the first optical fiber transmission passages 44, 48.

公开(公告)号：JP2000244394A

公开(公告)日：2000-09-08

申请号：JP2000040395

申请日：2000-02-18

Applicant: LUCENT TECHNOLOGIES INC

Inventor： EGGLETON BENJAMIN JOHN ,  NIELSEN TORBEN N ,  ROGERS JOHN A ,  STRASSER THOMAS ANDREW ,  WALKER KENNETH LEE

IPC: H04B10/02 ,  H04B10/18

Abstract: PROBLEM TO BE SOLVED: To optimize the performance of an optical communication system by providing a data maintenance monitor, and adjusting dispersion elements so that the performance of this system is optimized, and deciding the distribution of grating according to the strength of added currents, detecting the maintenance of transmitted data and controlling the currents to be added to the grating. SOLUTION: Each automatic distribution compensating module 20 is provided with a variable distribution compensator 30, a data maintenance monitor 31 and a feedback network 32, and the monitor 31 adjusts the distribution compensator 30 through the feedback network 32 so that the performance of this system is optimized. Part of a signal on a transmission fiber path 11 is sampled, for example, by a tap 34, and this signals is analyzed so that the scale of the maintenance of the transmitted data can be obtained, and a feedback signal for controlling a variable distribution compensation grating 33 can be obtained from this scale. In the variable distribution compensator 30, a signal light from the transmission fiber 11 is directed to the variable distribution compensation grating 33.