公开(公告)号：US5761234A

公开(公告)日：1998-06-02

申请号：US677146

申请日：1996-07-09

申请人： Richard R. Craig ,  Robert LG. Waarts ,  David F. Welch ,  John G. Endriz ,  Dirk J. Kuizenga ,  Steven Sanders

发明人： Richard R. Craig ,  Robert LG. Waarts ,  David F. Welch ,  John G. Endriz ,  Dirk J. Kuizenga ,  Steven Sanders

IPC分类号： H01S3/094 ,  H01S3/23 ,  H01S5/40 ,  H01S3/091 ,  H01S3/00 ,  H01S3/19

CPC分类号： H01S3/094003 ,  H01S3/2383 ,  H01S5/4031 ,  H01S3/09408 ,  H01S5/4025

摘要： An optical amplifier pumping system with built-in redundant reliability for lightwave communication system provides plural levels of redundancy. A first level of redundancy deals with redundancy in the form of plural primary laser diode sources in the lightwave communication system. A second level of redundancy deals with redundancy of multiple single mode laser emitters on the same chip or bar sufficiently segmented so as not to interfere with operation of or cause failure to adjacent or neighboring emitters on the same chip or bar. A third level of deals with redundancy of a plurality of fiber pump sources for pumping a plurality of serially connected injection signal fiber amplifiers.

摘要翻译： 具有光波通信系统内置冗余可靠性的光放大器泵浦系统提供多级冗余。 第一级冗余处理在光波通信系统中以多个主激光二极管源的形式的冗余。 第二级冗余处理在相同芯片或条上的多个单模激光发射器的冗余，其被充分分段，以便不会干扰相同芯片或条上相邻或相邻发射器的操作或引起故障。 用于泵浦多个串联连接的注入信号光纤放大器的多个光纤泵浦源的冗余的第三级处理。

公开(公告)号：US5565686A

公开(公告)日：1996-10-15

申请号：US400088

申请日：1995-03-07

申请人： David F. Welch

发明人： David F. Welch

IPC分类号： F41J5/02 ,  G01S17/00 ,  G01S17/89 ,  G01V8/18 ,  G01V8/26 ,  G01N21/00 ,  G01N21/86

CPC分类号： F41J5/02 ,  G01S17/00 ,  G01S17/89 ,  G01V8/18 ,  G01V8/26

摘要： An optical system and method for detecting the presence and location of multiple objects in a field. The optical system has at least one light source to generate a beam, which beam is scanned by at least one first reflecting surface to generate at least three sets of beams. A first and second set of beams are overlapped across the field by at least one second reflecting surface and a third set overlaps the field without the second reflecting surface. The beam intensity is measured by at least one detection means.

摘要翻译： 一种用于检测场中多个物体的存在和位置的光学系统和方法。 光学系统具有至少一个光源以产生光束，该光束被至少一个第一反射表面扫描以产生至少三组光束。 第一和第二组梁通过至少一个第二反射表面跨越场重叠，并且第三组在不具有第二反射表面的情况下与场重叠。 光束强度由至少一个检测装置测量。

公开(公告)号：US5185752A

公开(公告)日：1993-02-09

申请号：US837819

申请日：1992-02-18

申请人： David F. Welch ,  Robert G. Waarts

发明人： David F. Welch ,  Robert G. Waarts

IPC分类号： G02F1/35 ,  H01S3/109 ,  H01S5/06 ,  H01S5/065 ,  H01S5/14

CPC分类号： H01S5/141 ,  G02F1/3775 ,  G02F2001/3548 ,  G02F2202/20 ,  H01S5/0092 ,  H01S5/02252 ,  H01S5/0654 ,  H01S5/4062 ,  H01S5/4087

摘要： Arrangements for efficiently coupling light between a laser diode and a second-harmonic generator which feature external resonant cavities that include a feedback grating fabricated on the second-harmonic generator. The feedback grating reflects light of a first frequency that matches the frequency doubling band of the second-harmonic generator, thereby establishing stable laser oscillation at that first frequency. Preferably, the second-harmonic generator has a periodically-poled waveguide formed in the surface of the nonlinear material body. The laser diode may be butted against the harmonic generator or coupling optics may be positioned between the two. In one arrangement, a polarizer is placed in the resonant cavity, either between an external back reflector and the back facet of the laser diode or between the antireflection coated front facet of the laser diode and the harmonic generator, to provide loss to the TE polarization mode and enhance oscillation in the TM polarization mode. In another arrangement, a half-wave plate is positioned between the antireflection coated front facet of the laser diode and the input end of the harmonic generator to cause TE mode oscillation in the laser diode, while coupling TM polarized light into the harmonic generator. The laser diode may be a monolithic laser diode array with multiple emitters, with the second-harmonic generator having multiple waveguides for receiving and doubling the frequency of light received from a corresponding diode emitter. The diode array may be a multiple wavelength array.

摘要翻译： 用于在激光二极管和二次谐波发生器之间有效耦合光的布置，其特征在于包括在二次谐波发生器上制造的反馈光栅的外部谐振腔。 反馈光栅反射与二次谐波发生器的倍频带匹配的第一频率的光，从而在该第一频率处建立稳定的激光振荡。 优选地，二次谐波发生器具有形成在非线性材料体的表面中的周期性极化的波导。 激光二极管可以对着谐波发生器，或者耦合光学器件可以位于两者之间。 在一种布置中，偏振器被放置在谐振腔中，无论是在外部后反射器和激光二极管的背面之间，还是在激光二极管的抗反射涂覆的前面与谐波发生器之间，以提供TE偏振损耗 模式，并增强TM偏振模式下的振荡。 在另一种布置中，半波片位于激光二极管的抗反射涂层前面和谐波发生器的输入端之间，以在激光二极管中引起TE模式振荡，同时将TM偏振光耦合到谐波发生器中。 激光二极管可以是具有多个发射器的单片激光二极管阵列，其中二次谐波发生器具有多个波导，用于接收并加倍从相应的二极管发射器接收的光的频率。 二极管阵列可以是多波长阵列。

公开(公告)号：US10012797B1

公开(公告)日：2018-07-03

申请号：US11045462

申请日：2005-01-27

申请人： Radhakrishnan L. Nagarajan ,  Fred A. Kish, Jr. ,  Masaki Kato ,  Charles H. Joyner ,  David F. Welch ,  Randal A. Salvatore ,  Richard P. Schneider ,  Mehrdad Ziari ,  Damien Jean Henri Lambert ,  Sheila K. Hurtt ,  Andrew G. Dentai ,  Atul Mathur ,  Vincent G. Dominic

发明人： Radhakrishnan L. Nagarajan ,  Fred A. Kish, Jr. ,  Masaki Kato ,  Charles H. Joyner ,  David F. Welch ,  Randal A. Salvatore ,  Richard P. Schneider ,  Mehrdad Ziari ,  Damien Jean Henri Lambert ,  Sheila K. Hurtt ,  Andrew G. Dentai ,  Atul Mathur ,  Vincent G. Dominic

IPC分类号： G02B6/12 ,  G02B6/293

CPC分类号： G02B6/12004 ,  G02B6/12009 ,  G02B6/136 ,  H01S5/02248 ,  H01S5/026 ,  H01S5/0265 ,  H01S5/0268 ,  H01S5/0683 ,  H01S5/1221 ,  H01S5/1231 ,  H01S5/34306 ,  H01S5/4012 ,  H01S5/4087

摘要： A semiconductor monolithic transmitter photonic integrated circuit (TxPIC) comprises two different situations, either at least one signal channel in the PIC having a modulated source with the channel also extended to include at least one additional element or a plurality of modulated sources comprising N signal channels in the PIC of different transmission wavelengths, where N is equal to or greater than two (2), which may also approximate emission wavelengths along a standardized wavelength grid. In these two different situations, a common active region for such modulated sources and additional channel elements is identified as an extended identical active layer (EIAL), as it extends from a single modulated source to such additional channel elements in the same channel and/or extends to additional modulated sources in separate channels where the number of such channels is N equal to two or greater. The emission wavelength of laser sources in the modulated sources have different positively detuned offsets of the laser emission wavelength relative to the laser active region wavelength, i.e., (λL,i−λPL,L,j>0), and their emission wavelengths form a wavelength grid which may substantially conform to a standardized wavelength grid, such as the ITU grid. These laser sources in the modulated sources with an EIAL are preferentially detuned in the range, for example, of about 20 nm to about 70 nm, preferentially from about 25 nm to about 50 nm, from the active region wavelength of the modulated sources.

公开(公告)号：US08861977B2

公开(公告)日：2014-10-14

申请号：US13078888

申请日：2011-04-01

申请人： John D. McNicol ,  Matthew L. Mitchell ,  David F. Welch

发明人： John D. McNicol ,  Matthew L. Mitchell ,  David F. Welch

IPC分类号： H04J14/00 ,  H04J14/06 ,  H04J14/02

CPC分类号： H04J14/02 ,  H04J14/0256 ,  H04J14/026 ,  H04J14/06

摘要： A number of carriers are selected according to a modulation format and symbol rate to realize a superchannel having fixed capacity, for example. At a receive node, the superchannel is optically demultiplexed from a plurality of other superchannels. The plurality of carriers are then supplied to a photodetector circuit, which receives additional light at one of the optical signal carrier wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of the carriers is unnecessary.

摘要翻译： 根据调制格式和符号率来选择多个载波，以实现例如具有固定容量的超频道。 在接收节点处，超级信道从多个其他超级信道被光解复用。 然后将多个载波提供给光电检测器电路，该电路从本地振荡器激光器接收来自光信号载波波长的其中一个附加光。 在接收节点中提供模数转换器（ADC），以将从光电检测器输出的电信号转换为数字形式。 然后在电域中对ADC的输出进行滤波，使得载波的光解复用是不必要的。

公开(公告)号：US08660020B2

公开(公告)日：2014-02-25

申请号：US11871934

申请日：2007-10-12

申请人： Drew D. Perkins ,  David F. Welch ,  Ting-Kuang Chiang ,  Edward E. Sprague ,  Parthiban Kandappan ,  Stephen G. Grubb ,  Prasad Paranjape

发明人： Drew D. Perkins ,  David F. Welch ,  Ting-Kuang Chiang ,  Edward E. Sprague ,  Parthiban Kandappan ,  Stephen G. Grubb ,  Prasad Paranjape

IPC分类号： H04J1/16

CPC分类号： H04B10/27 ,  H04J14/02

摘要： Embodiments of the present invention compensate for skew across a wavelength division multiplexed network. The network is a wavelength division multiplexed optical transport network. The skew compensation can be performed electrically or optically. It can be performed on the transmission side of the network, the receiver side of the network or at any intermediary node on the network.

摘要翻译： 本发明的实施例补偿波分复用网络上的偏斜。 该网络是波分复用光传输网络。 偏斜补偿可以电或光学地执行。 它可以在网络的发送侧，网络的接收机侧或网络上的任何中间节点上执行。

公开(公告)号：US08655169B2

公开(公告)日：2014-02-18

申请号：US12239896

申请日：2008-09-29

申请人： Drew D. Perkins ,  David F. Welch

发明人： Drew D. Perkins ,  David F. Welch

IPC分类号： H04B17/00

CPC分类号： H04J14/0227 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0279 ,  H04L1/0009 ,  H04L1/0057

摘要： Consistent with the present disclosure, based on system requirements or in response to an increase in optical signal-to-noise level of an optical channel, such as a WDM channel, additional FEC bits are inserted into and replace selected data payload bits in each frame carried by the channel. The replaced data payload bits may then be transmitted in subsequent frames on the same channel. As a result, the transmitted frames have a reduced data payload rate, but a higher coding gain. Alternatively, the replaced data payload bits may be included in frames transmitted on another optical channel. In that case, the frames carried by the two channels typically have the same bit length or number of bits and may thus be compliant with the frame length requirements of G.709, for example. Preferably, the number of coding bits may be changed dynamically to obtain different coding gains.

摘要翻译： 与本公开一致，基于系统要求或响应于诸如WDM信道的光信道的光信噪比水平的增加，附加的FEC比特被插入并替换每个帧中的选定数据有效载荷比特 由频道携带 然后可以在相同信道上的后续帧中发送替换的数据有效载荷比特。 结果，所发送的帧具有减少的数据有效载荷速率，但是编码增益更高。 或者，替换的数据有效载荷比特可以包括在另一光信道上发送的帧中。 在这种情况下，由两个信道携带的帧通常具有相同的比特长度或比特数，并且因此可以符合例如G.709的帧长度要求。 优选地，可以动态地改变编码比特的数量以获得不同的编码增益。

公开(公告)号：US08548333B2

公开(公告)日：2013-10-01

申请号：US12753833

申请日：2010-04-02

申请人： Radhakrishnan L. Nagarajan ,  Masaki Kato ,  Fred A. Kish, Jr. ,  David F. Welch ,  Charles H. Joyner

发明人： Radhakrishnan L. Nagarajan ,  Masaki Kato ,  Fred A. Kish, Jr. ,  David F. Welch ,  Charles H. Joyner

IPC分类号： H04B10/00

CPC分类号： H04J14/02 ,  H04B10/40 ,  H04J14/06

摘要： The present invention provides for a transceiver comprising a transmitter portion and a receiver portion. The transmitter portion includes a laser, the laser providing an optical signal having one of a plurality of wavelengths. The optical signal from the laser is modulated to create a first wavelength-division multiplexed signal at an output of the transceiver. The optical signal from the laser is also used by a demultiplexer to demultiplexer a second wavelength-division multiplexed signal at an input of the transceiver. The use of the optical signal from the laser in both modulation and demodulation of wavelength-division multiplexed signals results in a transceiver having fewer discrete components resulting in a compact design and reduced costs.

摘要翻译： 本发明提供一种收发器，包括发射机部分和接收机部分。 发射机部分包括激光器，激光器提供具有多个波长中的一个的光信号。 来自激光器的光信号被调制以在收发器的输出处产生第一波分复用信号。 来自激光器的光信号也被解复用器使用，以在收发器的输入端解复用第二波分复用信号。 在波分复用信号的调制和解调中使用来自激光器的光信号导致具有较少分立组件的收发器，导致紧凑的设计并降低了成本。

公开(公告)号：US08521020B2

公开(公告)日：2013-08-27

申请号：US12795619

申请日：2010-06-07

申请人： David F. Welch ,  Drew D. Perkins ,  Fred A. Kish, Jr. ,  Ting-Kuang Chiang

发明人： David F. Welch ,  Drew D. Perkins ,  Fred A. Kish, Jr. ,  Ting-Kuang Chiang

IPC分类号： H04B10/04 ,  H04B10/08

CPC分类号： H01S5/0265 ,  B82Y20/00 ,  G02B6/12021 ,  H01S5/026 ,  H01S5/0264 ,  H01S5/0268 ,  H01S5/06256 ,  H01S5/06258 ,  H01S5/0683 ,  H01S5/1228 ,  H01S5/2077 ,  H01S5/22 ,  H01S5/3408 ,  H01S5/4025 ,  H01S5/4031 ,  H01S5/4087 ,  H01S5/50 ,  H04B10/25 ,  H04B10/2914 ,  H04B10/50 ,  H04B10/675 ,  H04J14/02 ,  H04J14/0279

摘要： A forward error correction (FEC) communication device that includes a transmitter photonic integrated circuit (TxPIC) or a receiver photonic integrated circuit (RxPIC) and a FEC device for FEC coding at least one channel with a first error rate and at least one additional channel with a second error rate, wherein the first error rate is greater than the second error rate. The TxPIC chip is a monolithic multi-channel chip having an array of modulated sources integrated on the chip, each operating at a different wavelength, wherein at least one of the modulated sources is modulated with a respective FEC encoded signal. The TxPIC also includes an integrated wavelength selective combiner for combining the channels for transport over an optical link.

摘要翻译： 包括发射机光子集成电路（TxPIC）或接收机光子集成电路（RxPIC）的前向纠错（FEC）通信设备和用于FEC编码具有第一错误率的至少一个信道和至少一个附加信道的FEC设备 具有第二错误率，其中第一错误率大于第二错误率。 TxPIC芯片是具有集成在芯片上的调制源阵列的单片多通道芯片，每个调制源阵列以不同的波长工作，其中至少一个调制源以相应的FEC编码信号进行调制。 TxPIC还包括用于组合用于光链路传输的信道的集成波长选择组合器。

公开(公告)号：US08184929B2

公开(公告)日：2012-05-22

申请号：US12345434

申请日：2008-12-29

申请人： Fred A. Kish, Jr. ,  Charles H. Joyner ,  David F. Welch ,  Robert B. Taylor ,  Alan C. Nilsson

发明人： Fred A. Kish, Jr. ,  Charles H. Joyner ,  David F. Welch ,  Robert B. Taylor ,  Alan C. Nilsson

IPC分类号： G02F1/01 ,  G02B6/12 ,  G02B6/26

CPC分类号： G02B6/12033 ,  B82Y20/00 ,  G02B6/02204 ,  G02B6/12004 ,  G02B6/12007 ,  G02B6/12019 ,  G02B6/12023 ,  G02B6/12026 ,  G02B6/12028 ,  G02B6/124 ,  G02F1/01725 ,  G02F2001/0175 ,  G02F2001/01758 ,  H01S5/0085 ,  H01S5/024 ,  H01S5/02415 ,  H01S5/02453 ,  H01S5/02461 ,  H01S5/02476 ,  H01S5/026 ,  H01S5/0261 ,  H01S5/0264 ,  H01S5/0265 ,  H01S5/0268 ,  H01S5/0425 ,  H01S5/0612 ,  H01S5/06256 ,  H01S5/06258 ,  H01S5/0683 ,  H01S5/0687 ,  H01S5/12 ,  H01S5/1228 ,  H01S5/2077 ,  H01S5/22 ,  H01S5/2214 ,  H01S5/2224 ,  H01S5/227 ,  H01S5/2272 ,  H01S5/2275 ,  H01S5/3408 ,  H01S5/34306 ,  H01S5/4025 ,  H01S5/4031 ,  H01S5/4087 ,  H01S5/50 ,  H04B10/2914 ,  H04B10/50 ,  H04B10/506 ,  H04B10/572 ,  H04J14/02

摘要： An optical transmitter comprises a monolithic transmitter photonic integrated circuit (TxPIC) chip that includes an array of modulated sources formed on the PIC chip and having different operating wavelengths approximating a standardized wavelength grid and providing signal outputs of different wavelengths. A wavelength selective combiner is formed on the PIC chip having a wavelength grid passband response approximating the wavelength grid of the standardized wavelength grid. The signal outputs of the modulated sources optically coupled to inputs of the wavelength selective combiner to produce a combined signal output from the combiner. A first wavelength tuning element coupled to each of the modulated sources and a second wavelength tuning element coupled to the wavelength selective combiner. A wavelength monitoring unit is coupled to the wavelength selective combiner to sample the combined signal output. A wavelength control system coupled to the first and second wavelength tuning elements and to said wavelength monitoring unit to receive the sampled combined signal output. The wavelength control system adjusts the respective wavelengths of operation of the modulated sources to approximate or to be chirped to the standardized wavelength grid and for adjusting the optical combiner wavelength grid passband response to approximate the standardized wavelength grid.

摘要翻译： 光发射机包括单片发射机光子集成电路（TxPIC）芯片，其包括形成在PIC芯片上的调制源的阵列，并且具有接近标准化波长网格并提供不同波长的信号输出的不同工作波长。 在具有近似于标准化波长网格的波长网格的波长网格通带响应的PIC芯片上形成波长选择性组合器。 调制源的信号输出光耦合到波长选择组合器的输入，以产生从组合器输出的组合信号。 耦合到每个调制源的第一波长调谐元件和耦合到波长选择组合器的第二波长调谐元件。 波长监测单元耦合到波长选择组合器以对组合的信号输出进行采样。 波长控制系统耦合到第一和第二波长调谐元件以及所述波长监视单元以接收采样的组合信号输出。 波长控制系统调整调制源的各个波长的波长近似于或被啁啾到标准化波长网格，并且用于调整光合并波长网格通带响应以近似标准化的波长网格。