公开(公告)号：CA2291556C

公开(公告)日：2002-12-24

申请号：CA2291556

申请日：1999-11-26

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ROGERS JOHN A ,  STRASSER THOMAS ANDREW ,  ADAMS LAURA ELLEN ,  EGGLETON BENJAMIN JOHN ,  ESPINDOLA ROLANDO PATRICIO ,  MAVOORI HAREESH ,  JIN SUNGHO

IPC: G02B5/18 ,  G02B1/10 ,  G02B6/02 ,  G02B6/34 ,  G02B26/00 ,  G02F1/01 ,  H04B10/02 ,  H04B10/18 ,  H04B10/43 ,  H04B10/17 ,  H04J14/02

Abstract: A tunable chromatic dispersion compensator for optical communication syste ms is disclosed. An optical grating, such as a fiber Bragg grating, non-chirped , linearly chirped or non-linearly chirped, is coated on its outer surface with a coati ng have a variable diameter and strained is applied to the fiber. The fiber may be latchably strained so that the grating characteristics may be changed or tuned while avoiding u se of a continuous power supply. Various optical networking applications using such dispersion compensating devices are also disclosed.

公开(公告)号：DE69940395D1

公开(公告)日：2009-03-26

申请号：DE69940395

申请日：1999-10-18

Applicant: LUCENT TECHNOLOGIES INC

Inventor： EGGLETON BENJAMIN JOHN ,  ROGERS JOHN A ,  STRASSER THOMAS ANDREW

IPC: G02F1/01 ,  H01S3/06 ,  G02B5/18 ,  G02B6/00 ,  G02B6/02 ,  G02B6/24 ,  G02B6/34 ,  H01S3/067 ,  H01S3/10 ,  H04B10/17 ,  H04B10/29

Abstract: In accordance with the invention, an optical waveguide grating with adjustable chirp comprises a waveguide grating in thermal contact with an electrically controllable heat-transducing body which varies the temperature along the length of the grating. The heat-transducing body can generate heat on the fiber or remove heat from the fiber to establish a temperature gradient along the grating. In an exemplary embodiment, the heat-transducing body is a resistive film coating whose local resistance varies along the length of the grating. Electrical current passed through the film generates a temperature gradient along the grating approximately proportional to the local resistance of the film, and the amount of chirp can be adjusted by the current. The resulting devices are simple, compact and power efficient.

公开(公告)号：DE60036970T2

公开(公告)日：2008-08-28

申请号：DE60036970

申请日：2000-02-09

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

公开(公告)号：DE69937182T2

公开(公告)日：2008-06-26

申请号：DE69937182

申请日：1999-11-09

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ESPINDOLA ROLANDO PATRICIO ,  STRASSER THOMAS ANDREW ,  WAGENER JEFFERSON LYNN ,  WYSOCKI PAUL FRANCIS

IPC: H01S3/06 ,  H01S3/067 ,  G02B6/00 ,  G02B6/02 ,  H01S3/10 ,  H04B10/17 ,  H04B10/29

Abstract: In accordance with the invention, a temperature-dependent rare earth doped waveguide optical amplifier is compensated by a temperature-dependent loss filter. The filter characteristics are designed to be temperature-dependent filters so that the gain characteristic of the amplifier is compensated over a practical operating temperature range. In essence, the amplifier comprises a length of optical waveguide for transmitting optical signals, a rare earth doped amplifying region in the waveguide for amplifying the transmitted optical signals, a pumping source for optically pumping the amplifying region, and a temperature-dependent loss filter. A typical design compensates an EFDA to a variation of less than 1 dB over a temperature range of -40 DEG C to 85 DEG C and a spectral range of at least 20 nm.

公开(公告)号：DE60133960D1

公开(公告)日：2008-06-26

申请号：DE60133960

申请日：2001-02-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ACKERMAN DAVID ALAN ,  BACHER KENNETH L ,  DAUTREMONT-SMITH WILLIAM ,  DU MEI ,  ROTTWITT KARSTEN ,  STENTZ ANDREW JOHN ,  STRASSER THOMAS ANDREW ,  ZHANG LIMING

IPC: G02F1/35 ,  H01S3/30 ,  H01S3/06 ,  H04B10/00 ,  H04B10/17

Abstract: A fiber Raman amplifier is configured to use a co-propagating Raman pump source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump source characteristics, sufficient optical gain can be achieved in the co-propagating arrangement, the characteristics including: (1) using an optical pump power of at least 50mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pump laser frequency and the signal frequency, and all intense longitudinal modes between different pump lasers being separated by at least the electrical bandwidth of the communication system.

公开(公告)号：DE60001812T2

公开(公告)日：2003-12-11

申请号：DE60001812

申请日：2000-12-08

Applicant: LUCENT TECHNOLOGIES INC

Inventor： STRASSER THOMAS ANDREW ,  WESTBROOK PAUL STEPHEN

IPC: G02B5/20 ,  G02B5/18 ,  G02B6/02 ,  G02B6/16

Abstract: A refractive index grating according to this invention is a tilted grating in a single mode optical waveguide, with a photosensitivity profile that includes at least one "tuning region" in the waveguide core (41). Appropriate choice of the photosensitivity profile, e.g. an annular tuning region (51) with low concentration of photosensitizing species, can result in a "supernull" in the LP01.f to LP01.b coupling. That is to say, the angular range of the tilt angle &thetas; over which the core mode coupling is essentially zero (i.e., 20dB) and bandwidth (>20nm). A method of trimming a grating is also disclosed.

公开(公告)号：AU4802301A

公开(公告)日：2001-12-06

申请号：AU4802301

申请日：2001-05-24

Applicant: LUCENT TECHNOLOGIES INC

Inventor： STRASSER THOMAS ANDREW ,  WESTBROOK PAUL STEPHEN

IPC: G02B6/02 ,  G02B6/12 ,  G02B6/14 ,  G02B6/34 ,  G02B6/16 ,  G02B6/22

Abstract: Disclosed is an article that comprises an optical waveguide mode converter for converting light of wavelength lambda in a few-moded optical waveguide from a given guided mode (e.g., LP01.f) to another guided mode (e.g., LP02.b). The converter comprises a tilted refractive index grating in the core of the waveguide. Appropriate choice of the refractive index profile n(r), photosensitivity p(r) and tilt angle&thetas; makes possible substantial nulling of the coupling between some guided modes (e.g., LP01.f to LP01.b, and LP01.f to LP11.b), and substantial maximization of the coupling between other guided modes (e.g., LP01.f to LP02.b). Mode converters according to the invention can be advantageously used in optical fiber communication systems in add/drop multiplexers.

公开(公告)号：CA2335166A1

公开(公告)日：2001-09-03

申请号：CA2335166

申请日：2001-02-09

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ZHANG LIMING ,  STRASSER THOMAS ANDREW ,  DU MEI ,  ACKERMAN DAVID ALAN ,  STENTZ ANDREW JOHN ,  ROTTWITT KARSTEN ,  BACHER KENNETH L ,  DAUTREMONT-SMITH WILLIAM CROSS

IPC: G02F1/35 ,  H01S3/06 ,  H01S3/30 ,  H04B10/00 ,  H04B10/17 ,  G02F1/39

Abstract: A fiber Raman amplifier is configured to use a co-propagating Raman pum p source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump sour ce characteristics, sufficient optical gain can be achieved in the co-propagati ng arrangement, the characteristics including: (1) using an optical pump power of at least 50mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pu mp laser frequency and the signal frequency, and all intense longitudinal modes betwe en different pump lasers being separated by at least the electrical bandwidth o f the communication system.

公开(公告)号：DE69937182D1

公开(公告)日：2007-11-08

申请号：DE69937182

申请日：1999-11-09

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ESPINDOLA ROLANDO PATRICIO ,  STRASSER THOMAS ANDREW ,  WAGENER JEFFERSON LYNN ,  WYSOCKI PAUL FRANCIS

IPC: H01S3/06 ,  H01S3/067 ,  G02B6/00 ,  G02B6/02 ,  H01S3/10 ,  H04B10/17 ,  H04B10/29

Abstract: In accordance with the invention, a temperature-dependent rare earth doped waveguide optical amplifier is compensated by a temperature-dependent loss filter. The filter characteristics are designed to be temperature-dependent filters so that the gain characteristic of the amplifier is compensated over a practical operating temperature range. In essence, the amplifier comprises a length of optical waveguide for transmitting optical signals, a rare earth doped amplifying region in the waveguide for amplifying the transmitted optical signals, a pumping source for optically pumping the amplifying region, and a temperature-dependent loss filter. A typical design compensates an EFDA to a variation of less than 1 dB over a temperature range of -40 DEG C to 85 DEG C and a spectral range of at least 20 nm.

公开(公告)号：DE60120013D1

公开(公告)日：2006-07-06

申请号：DE60120013

申请日：2001-02-26

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ERDOGAN TURAN ,  STRASSER THOMAS ANDREW ,  WESTBROOK PAUL STEPHEN

IPC: H04B10/135

Abstract: Polarization monitoring and control in a lightwave communication system is achieved by using an in-line polarimeter in conjunction with a polarization controller. The devices are readily compact, accurate and therefore capable of implementation in a variety of system applications. In one embodiment, a polarimeter and controller can be coupled together by a feedback loop between the polarimeter output and the controller input to provide "active polarization control" (APC).