公开(公告)号：US06239866B1

公开(公告)日：2001-05-29

申请号：US09348208

申请日：1999-07-08

Applicant: Jake Bromage ,  Ian Walmsley

Inventor： Jake Bromage ,  Ian Walmsley

IPC: G01C308

CPC classification number: G01J11/00

Abstract: Dithered-edge sampling (DES) enables ultra-wideband measurement of terahertz pulses (far infrared electromagnetic pulses) using photoconductive antennas. The terahertz pulse is sampled by first passing it through a triggered photoconductive attenuator whose fast attenuation edge (limited only by the duration of the optical gating pulse) is dithered in time. A slow photoconductive receiver then measures the component of the terahertz electric field that is modulated at the dither frequency. The current through the photoconductive element constituting the receiver passes through a locking amplifier which may be operated at dither frequency. When used alone, the receiver blurs the measured terahertz pulse width. However, the increased time resolution provided by DES enables measurement of source-limited terahertz pulse widths. In addition, DES may be used to make direct measurements of a photoconductive receiver's temporal response.

Abstract translation: 抖动采样（DES）使用光电导天线实现太赫兹脉冲（远红外线电磁脉冲）的超宽带测量。 首先将太赫兹脉冲通过触发的光电导衰减器进行采样，其衰减衰减沿（光限制脉冲的持续时间仅受到限制）在时间上抖动。 慢光电接收器然后测量以抖动频率调制的太赫兹电场的分量。 通过构成接收器的光导元件的电流通过可以以抖动频率操作的锁定放大器。 当单独使用时，接收器会模糊测量的太赫兹脉冲宽度。 然而，由DES提供的增加的时间分辨率可以测量源极限制的太赫兹脉冲宽度。 此外，DES可用于对光电导体的时间响应进行直接测量。

公开(公告)号：US06721088B2

公开(公告)日：2004-04-13

申请号：US10098940

申请日：2002-03-15

Applicant: Khushvinder Brar ,  Clifford Headley ,  Jean-Christopher Bouteiller ,  Jake Bromage

Inventor： Khushvinder Brar ,  Clifford Headley ,  Jean-Christopher Bouteiller ,  Jake Bromage

IPC: H01S300

CPC classification number: H01S3/094003 ,  H01S3/06758 ,  H01S3/094042 ,  H01S3/094046 ,  H01S3/094069 ,  H01S3/094096 ,  H01S3/302

Abstract: In accordance with the invention, an optical fiber communication system comprising a source of optical signal channels and an optical fiber transmission line is provided with one or more single source, multiple-order Raman pumps downstream of the source. Each single source pump provides multiple-order Raman pump light for amplifying the signal channels.

Abstract translation: 根据本发明，包括光信号通道源和光纤传输线的光纤通信系统在源的下游设置有一个或多个单源，多阶拉曼泵。 每个单泵源提供多阶拉曼泵浦光，用于放大信号通道。

公开(公告)号：US07206123B2

公开(公告)日：2007-04-17

申请号：US10935286

申请日：2004-09-08

Applicant: Yoshihiro Emori ,  Jake Bromage ,  Lynn E. Nelson ,  Shu Namiki

Inventor： Yoshihiro Emori ,  Jake Bromage ,  Lynn E. Nelson ,  Shu Namiki

IPC: H01S4/00 ,  H04B10/12

CPC classification number: H01S3/06754 ,  H01S3/0078 ,  H01S3/06758 ,  H01S3/094011 ,  H01S3/0941 ,  H01S3/10069 ,  H01S3/1305 ,  H01S3/302 ,  H04B10/2916

Abstract: A method, pump and Raman amplifier control an amount of stimulated Brillouin scattering (SBS) produced by the Raman amplifier pump so as to regulate a power penalty experienced by a receiver due to the SBS. A multi-mode semiconductor laser produces a multi-mode pump light having a dominate mode at a predetermined wavelength. At least a portion of the multi-mode pump light is coupled to a Raman gain medium in a forward pumping direction. A reflection sensor monitors reflected light that is at least partially reflected from said Raman gain medium. The reflection sensor has a passband characteristic that passes optical power of a dominate SBS peak of said reflected light, but suppresses other SBS peaks that are offset in wavelength from said dominate SBS peak. The optical power of the dominate SBS peak is compared to an optical power of the multi-mode pump light, and it is determined whether a result of the comparing step is above a predetermined threshold.

Abstract translation: 一种方法，泵浦和拉曼放大器控制由拉曼放大器泵产生的受激布里渊散射（SBS）的量，以便调节由于SBS而导致的接收器所经受的功率损失。 多模半导体激光器产生具有预定波长的主导模式的多模式泵浦光。 至少一部分多模式泵浦光在正向泵送方向上耦合到拉曼增益介质。 反射传感器监测至少部分地从所述拉曼增益介质反射的反射光。 反射传感器具有通过所述反射光的主要SBS峰值的光焦度的通带特性，但抑制了波长偏离所述主导SBS峰值的其他SBS峰值。 将主要SBS峰值的光功率与多模式泵浦光的光功率进行比较，并且确定比较步骤的结果是否高于预定阈值。

公开(公告)号：US20050105165A1

公开(公告)日：2005-05-19

申请号：US10935286

申请日：2004-09-08

Applicant: Yoshihiro Emori ,  Jake Bromage ,  Lynn Nelson ,  Shu Namiki

Inventor： Yoshihiro Emori ,  Jake Bromage ,  Lynn Nelson ,  Shu Namiki

IPC: G02F1/35 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/13 ,  H01S3/131 ,  H01S3/30 ,  H04B10/17

CPC classification number: H01S3/06754 ,  H01S3/0078 ,  H01S3/06758 ,  H01S3/094011 ,  H01S3/0941 ,  H01S3/10069 ,  H01S3/1305 ,  H01S3/302 ,  H04B10/2916

Abstract: A method, pump and Raman amplifier control an amount of stimulated Brillouin scattering (SBS) produced by the Raman amplifier pump so as to regulate a power penalty experienced by a receiver due to the SBS. A multi-mode semiconductor laser produces a multi-mode pump light having a dominate mode at a predetermined wavelength. At least a portion of the multi-mode pump light is coupled to a Raman gain medium in a forward pumping direction. A reflection sensor monitors reflected light that is at least partially reflected from said Raman gain medium. The reflection sensor has a passband characteristic that passes optical power of a dominate SBS peak of said reflected light, but suppresses other SBS peaks that are offset in wavelength from said dominate SBS peak. The optical power of the dominate SBS peak is compared to an optical power of the multi-mode pump light, and it is determined whether a result of the comparing step is above a predetermined threshold.

Abstract translation: 一种方法，泵浦和拉曼放大器控制由拉曼放大器泵产生的受激布里渊散射（SBS）的量，以便调节由于SBS而导致的接收器所经受的功率损失。 多模半导体激光器产生具有预定波长的主导模式的多模式泵浦光。 至少一部分多模式泵浦光在正向泵送方向上耦合到拉曼增益介质。 反射传感器监测至少部分地从所述拉曼增益介质反射的反射光。 反射传感器具有通过所述反射光的主要SBS峰值的光焦度的通带特性，但抑制了波长偏离所述主导SBS峰值的其他SBS峰值。 将主要SBS峰值的光功率与多模式泵浦光的光功率进行比较，并且确定比较步骤的结果是否高于预定阈值。

公开(公告)号：US06865327B2

公开(公告)日：2005-03-08

申请号：US10247100

申请日：2002-09-19

Applicant: Robert M. Atkins ,  Alice W. Liu ,  Poul Kristensen ,  Morten Østergaard Pedersen ,  Stig Nissen Knudsen ,  Jan Levin Nielsen ,  Jake Bromage ,  Kai H. Chang

Inventor： Robert M. Atkins ,  Alice W. Liu ,  Poul Kristensen ,  Morten Østergaard Pedersen ,  Stig Nissen Knudsen ,  Jan Levin Nielsen ,  Jake Bromage ,  Kai H. Chang

IPC: C03B37/014 ,  C03C13/04 ,  G02B6/02

CPC classification number: C03C13/045 ,  C03B37/014 ,  C03B2201/03 ,  C03B2201/07 ,  G02B6/02

Abstract: Applicants have discovered the existence of loss peaks in optical fiber transmission systems using wavelengths in the E-band and the L-band. Specifically, they have discovered the existence of narrow loss peaks at 1440 nm, 1583 nm and 1614 nm. Because the peaks are relatively narrow, they cannot be easily removed by conventional gain equalizers in long haul transmission systems, and although the peaks are relatively small, they can nonetheless cause transmission channels to drop out in amplified DWDM transmission systems. Applicants have further discovered that these loss peaks are due to carbon contamination of the transmission fiber. Thus optical fibers should be fabricated essentially free of carbon contamination. This means eliminating carbon-containing reagents in preform and tube-making processes.

Abstract translation: 申请人已经发现在使用E波段和L波段的光纤传输系统中存在损耗峰值。 具体来说，他们已经发现在1440nm，1583nm和1614nm处存在窄的损耗峰。 由于峰值相对较窄，它们不能通过长距离传输系统中的常规增益均衡器容易地去除，尽管峰值相对较小，但是它们仍可能使传输信道在放大的DWDM传输系统中丢失。 申请人进一步发现，这些损失峰值是由于传输纤维的碳污染。 因此，光纤应该基本上没有碳污染。 这意味着在预成型件和制管工艺中消除含碳试剂。