公开(公告)号：DE69706726D1

公开(公告)日：2001-10-25

申请号：DE69706726

申请日：1997-02-18

Applicant: LUCENT TECHNOLOGIES INC

Inventor： JUDKINS JUSTIN BOYD ,  VENGSARKAR ASHISH MADHUKAR ,  PEDRAZZANI JANET RENEE

IPC: G02B5/18 ,  G02B6/02 ,  G02B6/10 ,  G02B6/34 ,  G02B27/09 ,  G02F1/225 ,  H01S3/10 ,  H04B10/29 ,  G02B6/16

Abstract: The present invention provides an optical signal shaping device, such as a long period grating, for use with an optical fiber having a core of a first prescribed refractive index n1 and a cladding of a second prescribed refractive index n2 and configured to transmit an optical signal therethrough. The optical signal shaping device comprises a long period grating of predetermined length formed within the optical fiber. The long period grating has a nonuniform refractive index profile extending over at least a portion of the predetermined length and is configured to alter the optical signal to produce an asymmetrical optical signal.

公开(公告)号：DE69801632D1

公开(公告)日：2001-10-18

申请号：DE69801632

申请日：1998-11-03

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ABRAMOV ANATOLI A ,  HALE ARTURO ,  MOCK JOEL LESLIE ,  STRASSER THOMAS A ,  VENGSARKAR ASHISH MADHUKAR

IPC: G02B26/00 ,  G02F1/313 ,  H04B10/02 ,  H04B10/152 ,  H04J14/00 ,  H04J14/02 ,  H04B10/08

Abstract: Apparatus for monitoring multi-wavelength optical systems includes an optical fiber system (44) and apparatus (42) for separating the different wavelengths of transmitted light transmitted therethrough and for monitoring the respective optical power in the separated spectral components. More specifically, embodiments of the invention scan or modify the physical parameters of in-fiber gratings (46) that couple light between spatially different modes of light within a wavelength-division-multiplexed optical fiber system, separate the spatial modes using a mode-discriminating device (47) and monitor or detect the separated spectral components using a conventional or other suitable detector (48). By scanning the in-fiber gratings, the peak wavelength of coupling between two dissimilar modes is modified, thus allowing control of the coupling within the fiber optic system. Scanning the grating is performed, for example, by changing the temperature or modifying the physical dimensions of the grating. In one embodiment, the system employs a long-period grating that couples light between two co-propagating, spatially different modes. In an alternative embodiment, the system uses a short-period grating that couples light between a forward propagating mode and a spatially dissimilar, backward propagating mode.

公开(公告)号：DE69800010T2

公开(公告)日：2000-01-27

申请号：DE69800010

申请日：1998-01-27

Applicant: LUCENT TECHNOLOGIES INC

Inventor： REED WILLIAM ALFRED ,  VENGSARKAR ASHISH MADHUKAR

IPC: G02B6/00 ,  G02B6/02 ,  H04B10/02 ,  H04B10/18 ,  H04J14/00 ,  H04J14/02

Abstract: The system includes a transmitter, a receiver and an optical fibre transmission path that connects the transmitter and receiver. The system transmits signals in N transmission channels of wavelengths lambda 1-lambda N, where N is an integer greater than 1. The transmission path comprises first single mode optical fibre with non-zero chromatic dispersion of a first mathematical sign at the wavelengths lambda 1-lambda N. The path also has dispersion compensating second single mode optical fibre (13) with non-zero chromatic dispersion of a second mathematical sign at the wavelengths lambda 1-lambda N. The transmission path also has a third single mode optical fibre which is a dispersion slope compensating fibre (14) or DSCF. The DSCF has a dispersion slope in the wavelength range lambda 1-lambda N. The dispersion slope and the length of the DSCF in the transmission path are selected so that the total chromatic dispersion of the transmission path at all of the wavelengths lambda 1-lambda N is nominally zero.

公开(公告)号：DE69800010D1

公开(公告)日：1999-09-02

申请号：DE69800010

申请日：1998-01-27

Applicant: LUCENT TECHNOLOGIES INC

Inventor： REED WILLIAM ALFRED ,  VENGSARKAR ASHISH MADHUKAR

IPC: G02B6/00 ,  G02B6/02 ,  H04B10/02 ,  H04B10/18 ,  H04J14/00 ,  H04J14/02

Abstract: The system includes a transmitter, a receiver and an optical fibre transmission path that connects the transmitter and receiver. The system transmits signals in N transmission channels of wavelengths lambda 1-lambda N, where N is an integer greater than 1. The transmission path comprises first single mode optical fibre with non-zero chromatic dispersion of a first mathematical sign at the wavelengths lambda 1-lambda N. The path also has dispersion compensating second single mode optical fibre (13) with non-zero chromatic dispersion of a second mathematical sign at the wavelengths lambda 1-lambda N. The transmission path also has a third single mode optical fibre which is a dispersion slope compensating fibre (14) or DSCF. The DSCF has a dispersion slope in the wavelength range lambda 1-lambda N. The dispersion slope and the length of the DSCF in the transmission path are selected so that the total chromatic dispersion of the transmission path at all of the wavelengths lambda 1-lambda N is nominally zero.

公开(公告)号：EP0814629A2

公开(公告)日：1997-12-29

申请号：EP97303988

申请日：1997-06-09

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BARROS MIRIAM R DE ,  ESKILDSEN LARS ERIK ,  NYKOLAK GERALD ,  VENGSARKAR ASHISH MADHUKAR ,  NIELSEN TORBEN N ,  TANBUN-EK TAWEE

IPC: G02B6/293 ,  G02F1/313 ,  H04B10/02 ,  H04J14/00 ,  H04J14/02 ,  H04Q11/00 ,  H04B10/12

CPC classification number: H04Q11/0005 ,  H04J14/0212 ,  H04J14/0213 ,  H04Q2011/0009 ,  H04Q2011/0015 ,  H04Q2011/0022 ,  H04Q2011/0026 ,  H04Q2011/0039

Abstract: In accordance with the invention a multiwavelength optical fiber cross connect is provided with an active all-fiber optical router for multiplexing/demultiplexing. The router is comprised of one electronic component -- a phase controller -- and four fiber components: 1) a fiber directional coupler, 2) a fiber reflective grating filter, 3) a fiber tap, and 4) a fiber phase modulator. The application describes how to make optical routers from these components ranging in complexity from a single wavelength drop router to an N-port, N-wavelength router for add/drop multiplexing. The application also describes how optical wavelength routers can be combined to create optical fiber Cross connect (OXCs), ranging in complexity from 2X2 single wavelength OXCs to NXN, M-wavelength OXCs.

Abstract translation: 根据本发明，多波长光纤交叉连接器设置有用于复用/解复用的有源全光纤光路由器。 路由器由一个电子部件 - 相位控制器和四个光纤部件组成：1）光纤定向耦合器，2）光纤反射光栅滤波器，3）光纤抽头，以及4）光纤相位调制器。 该应用程序描述了如何使这些组件的光路由器的复杂性从单个波长丢弃路由器到N端口，N波长路由器进行分插复用。 该应用还描述了光波长路由器如何组合以创建光纤交叉连接（OXC），其范围从2X2单波长OXC到NXN，M波长OXC。

公开(公告)号：EP0785600A3

公开(公告)日：1998-06-03

申请号：EP97300064

申请日：1997-01-07

Applicant: LUCENT TECHNOLOGIES INC

Inventor： HODGSON CRAIG W ,  VENGSARKAR ASHISH MADHUKAR

IPC: G02B6/02 ,  G02B6/44 ,  H01S3/06 ,  H01S3/067 ,  H01S3/10 ,  H04B10/02 ,  H04B10/28

CPC classification number: H01S3/06795 ,  H01S3/0675 ,  H01S2301/04

Abstract: A high power, broad bandwidth light source comprises at least one rare earth doped fiber coupled to a long period grating. When the rare earth doped fiber is pumped to operate as an amplified spontaneous emission source, the grating flattens and broadens the output spectrum. Using an Nd doped fiber, applicants have achieved an output power of 25 mW at a center wavelength of 1.08 µm, a spectral width of 40 nm and a coherence length of 10 µm. The source has a flat output spectrum with a maximum slope of 0.1 dB/nm across the full spectral width, and it can be conveniently dropped into any fiber system requiring high power and a broad spectrum.
Using an Er-doped fiber, applicants have achieved an output power of 7.3 mW at a center wavelength of 1.55 µm and a spectral width of 38 nm. The source has a flat output spectrum with a maximum ripple of 1.7 dB across the full width. This source is compatible with the needs for a spectrum sliced source.