公开(公告)号：WO2009049880A3

公开(公告)日：2009-04-23

申请号：PCT/EP2008/008735

申请日：2008-10-15

Applicant: BOOKHAM TECHNOLOGY PLC ,  MOHRDIEK, Stefan ,  TROGER, Joerg ,  MATUSCHEK, Nicolai

Inventor： MOHRDIEK, Stefan ,  TROGER, Joerg ,  MATUSCHEK, Nicolai

IPC: H01S5/14 ,  H01S5/065 ,  H01S3/067 ,  H01S3/0941

Abstract: A laser light source comprises a semiconductor laser adapted for pulsed operation, a partially transmitting wavelength selective light reflector. The semiconductor laser comprises a front facet and a back facet. The front facet and the back facet define an internal laser cavity. The internal laser cavity comprises a laser active medium. The partially transmitting wavelength selective light reflector has a peak reflectivity within a gain bandwidth of said laser active medium. The wavelength selective light reflector and the back facet define an external laser cavity. A roundtrip time of light in the external laser cavity is about 20 nanoseconds or less. A full width half maximum bandwidth of the wavelength selective light reflector is adapted to accommodate at least 12 longitudinal modes of the internal laser cavity and at least 250 longitudinal modes of the external laser cavity.

公开(公告)号：WO2009037555A3

公开(公告)日：2009-03-26

申请号：PCT/IB2008/002442

申请日：2008-09-18

Applicant: BOOKHAM TECHNOLOGY PLC ,  KREJCI, Martin ,  LICHTENSTEIN, Norbert ,  WEISS, Stefan ,  TROGER, Hans Jörg

Inventor： KREJCI, Martin ,  LICHTENSTEIN, Norbert ,  WEISS, Stefan ,  TROGER, Hans Jörg

IPC: H01S5/024

Abstract: A high power laser source comprises a bar of laser diodes, a submount onto which said laser bar is affixed, and a cooler onto which said submount is affixed. The laser bar has a first coefficient of thermal expansion (CTE bar ), the submount has a second coefficient of thermal expansion (CTE sub ), and the cooler has a third coefficient of thermal expansion (CTE cool ), the third coefficient (CTE cool ) being higher than both said first coefficient (CTE bar ) and said second coefficient (CTE sub ). According to the invention, the second coefficient (CTE sub ) is selected lower than both the first coefficient (CTE bar ) and the third coefficient (CTE cool ), contrary to the usual approach with the CTE sub matching the CTE bar . A preferred range is CTE sub = k * CTE bar , with 0.4 sub which varies across the submount's thickness. Alternatively, the submount may consist of a single, more or less homogeneous material with a CTE sub varying across the submount's thickness. A method for making such a high power laser source includes selecting a submount whose CTE sub lies between the CTE cool of the cooler and the CTE bar of the bar of laser diodes and hard soldering the bar and the cooler to the submount.

公开(公告)号：WO2007132268A3

公开(公告)日：2008-03-27

申请号：PCT/GB2007050257

申请日：2007-05-11

Applicant: BOOKHAM TECHNOLOGY PLC ,  MCCLEAN IAN PETER ,  FOURTE STEPHEN DAVID ,  DRAKE JONATHON STUART ,  FLINTHAM BARRIE

Inventor： MCCLEAN IAN PETER ,  FOURTE STEPHEN DAVID ,  DRAKE JONATHON STUART ,  FLINTHAM BARRIE

IPC: H01S3/13 ,  H01S3/067 ,  H04B10/296

CPC classification number: H01S3/1301 ,  H01S3/06754 ,  H01S3/1305 ,  H04B10/296

Abstract: A variable gain optical amplifier comprises an EDFA for amplifying optical signals at different wavelengths and a pump driver (14) for optically pumping the EDFA to provide optical gain. An input detector (2) is provided for monitoring the power Pin of input signals to the EDFA, and an output detector (3) is provided for monitoring the power Pout of output signals from the EDFA. A gain control arrangement is provided for supplying a drive signal to the pump driver 14 to control the optical gain including a feed forward arrangement (20, 21, 22, 23) for supplying a feed forward signal dependent on the monitored input power Pin, and a feed back arrangement (5, 6, 7, 8, 9, 30) for supplying a feed back signal dependent on the monitored output power Pout. In order to ensure rapid gain control the feed back arrangement comprises an adaptive proportional-integral (PI or PID) controller (30) for controlling the optical gain at a required gain set point in accordance with proportional and integral control coefficients Kp and Ki corresponding to a required gain profile, at least one of which is dynamically variable in dependence on the monitored output power Pout, the output signal from the controller (30) and the feed forward signal being added in an adder (31) to produce the drive signal for the pump driver (14).

Abstract translation: 可变增益光放大器包括用于放大不同波长的光信号的EDFA和用于光泵浦EDFA以提供光增益的泵驱动器（14）。 提供输入检测器（2），用于监视到EDFA的输入信号的电源引脚，并且提供输出检测器（3），用于监视来自EDFA的输出信号的功率Pout。 提供增益控制装置，用于向泵驱动器14提供驱动信号以控制光学增益，其包括用于提供取决于所监视的输入功率Pin的前馈信号的前馈布置（20,21,22,23），以及 反馈装置（5,6,7,8,9,30），用于根据所监视的输出功率Pout提供反馈信号。 为了确保快速增益控制，反馈装置包括一个自适应比例积分（PI或PID）控制器（30），用于根据对应于对应的比例积分控制系数Kp和Ki控制在所需增益设定点处的光增益 所需增益分布，其中至少一个根据所监视的输出功率Pout动态变化，来自控制器（30）的输出信号和加法器（31）中的前馈信号相加以产生用于 泵驱动器（14）。

公开(公告)号：WO2007079378A1

公开(公告)日：2007-07-12

申请号：PCT/US2006/062618

申请日：2006-12-27

Applicant: BOOKHAM TECHNOLOGY PLC ,  PEASE, John S.

Inventor： PEASE, John S.

IPC: H04B10/158

CPC classification number: H04B10/66

Abstract: An optical receiver and method of operating therefore. A photodiode converts a received optical signal to an electrical signal, which is provided to both high gain and low gain signal paths. First analog-to-digital converter ADC) circuitry is coupled to convert a high gain output signal into a first plurality of digital signals, while second ADC circuitry converts a low gain output signal into a second plurality of digital signals. A control unit is configured to monitor the amplitude of at least one of the low gain and high gain output signals. If the amplitude of the monitored signal falls below a predetermined threshold, the control unit is configured to select data provided by the first ADC circuitry. Otherwise, data provided by the second ADC circuitry is selected.

Abstract translation: 一种光接收机及其操作方法。 光电二极管将接收的光信号转换为提供给高增益和低增益信号路径的电信号。 第一模数转换器ADC）电路被耦合以将高增益输出信号转换成第一多个数字信号，而第二ADC电路将低增益输出信号转换成第二多个数字信号。 控制单元被配置为监视低增益和高增益输出信号中的至少一个的振幅。 如果所监视的信号的幅度下降到预定阈值以下，则控制单元被配置为选择由第一ADC电路提供的数据。 否则，选择由第二ADC电路提供的数据。

公开(公告)号：WO2007077437A1

公开(公告)日：2007-07-12

申请号：PCT/GB2006/050467

申请日：2006-12-19

Applicant: BOOKHAM TECHNOLOGY PLC ,  YAO, Jianguo ,  PAN, Qi ,  HAGMAN, Matthew

Inventor： YAO, Jianguo ,  PAN, Qi ,  HAGMAN, Matthew

IPC: H03K19/003

CPC classification number: H03F1/52 ,  H03F1/08 ,  H03F3/45475

Abstract: Transimpedance Amplifier Protection Circuits A TIA protection circuit comprises a TIA bias supply VTIA for applying a bias voltage to the TIA, an APD bias supply VAPD for applying a bias voltage to an APD connected to an input of the TIA, and TIA protection means for reducing the bias voltage applied to the APD to a safe level when the power supplied to the TIA is removed so as to protect the input of the TIA from the application of an excessive voltage. This provides fast protection against high voltages to the input stage of a CMOS-based TIA that is simple and reliable in operation. Due to space limitations and power consumption constraints in small form factor pluggable modules, such as XFP and SFP modules, the circuit must be simple, small and require very low power. Several alternative protection schemes are possible, one using a circuit in parallel with the APD bias supply and one using circuit in series with the APD bias supply. The parallel protection scheme uses a fast switch in parallel with the APD bias supply so that, when the TIA bias voltage is turned off for any reason, the protection switch will connect the APD cathode (and TIA input) to ground (0V). In the serial protection scheme the protection switch is connected between the APD and APD bias supply so that, when the TIA bias voltage is turned off for any reason, the protection switch will isolate the APD cathode from the high voltage APD bias supply.

Abstract translation: 互阻抗放大器保护电路TIA保护电路包括用于向TIA施加偏置电压的TIA偏置电源VTIA，用于向连接到TIA的输入端的APD施加偏置电压的APD偏置电源VAPD，以及用于减小TIA的TIA保护装置 当提供给TIA的电力被去除时，施加到APD的偏置电压达到安全水平，以便保护TIA的输入免受过度电压的应用。 这提供了对基于CMOS的TIA的输入级的高电压的快速保护，其在操作中是简单和可靠的。 由于小尺寸可插拔模块（如XFP和SFP模块）的空间限制和功耗限制，电路必须简单，小巧，功耗非常低。 一些替代保护方案是可能的，一种使用与APD偏置电源并联的电路，以及一个使用与APD偏置电源串联的电路。 并联保护方案使用与APD偏置电源并联的快速开关，因此当TIA偏置电压由于任何原因关闭时，保护开关将APD阴极（和TIA输入）连接到地（0V）。 在串联保护方案中，保护开关连接在APD和APD偏置电源之间，使得当TIA偏置电压由于任何原因关闭时，保护开关将APD阴极与高压APD偏置电源隔离。

公开(公告)号：WO2007053344A1

公开(公告)日：2007-05-10

申请号：PCT/US2006/041249

申请日：2006-10-24

Applicant: BOOKHAM TECHNOLOGY PLC ,  IACONO, Carl ,  ARNONE, David, Francis ,  WALLACE, Ken

Inventor： IACONO, Carl ,  ARNONE, David, Francis ,  WALLACE, Ken

IPC: G02B7/182 ,  G02B7/195

CPC classification number: G02B7/003 ,  G02B7/008 ,  G02B7/1822

Abstract: An optical assembly (16) for a precision apparatus (10) includes an optical element (234) and a housing (230) that defines a housing cavity (244). The housing (230) includes a body section (238), a removable section (240) and a fastener assembly (242). The body section (238) is secured to an apparatus frame (12) of the precision apparatus (10). The removable section (240) retains the optical element (234) with the optical element (234) positioned in the housing cavity (244). The fastener assembly (242) selective secures the removable section (240) to the body section (238). With this design, the removable section (240) can be selectively removed to repair or replace the optical element (234) and the optical element (234) is supported by a rigid mechanical housing (230) so that the optical element (234) is less susceptible to long term or operating misalignments.

Abstract translation: 用于精密设备（10）的光学组件（16）包括限定壳体空腔（244）的光学元件（234）和壳体（230）。 壳体（230）包括主体部分（238），可移除部分（240）和紧固件组件（242）。 主体部（238）固定在精密装置（10）的装置框架（12）上。 可拆卸部分（240）将光学元件（234）保持在光学元件（234）位于壳体空腔（244）中。 紧固件组件（242）选择性地将可移除部分（240）固定到主体部分（238）。 利用这种设计，可以选择性地去除可拆卸部分（240）以修复或更换光学元件（234），并且光学元件（234）由刚性机械壳体（230）支撑，使得光学元件（234） 不太容易长期或经营不对准。

公开(公告)号：WO2007036702A1

公开(公告)日：2007-04-05

申请号：PCT/GB2006/003556

申请日：2006-09-26

Applicant: BOOKHAM TECHNOLOGY PLC ,  BETTY, Ian, Brian ,  PROSYK, Kelvin

Inventor： BETTY, Ian, Brian ,  PROSYK, Kelvin

IPC: G02F1/015

CPC classification number: G02F1/015 ,  G02F2001/0155 ,  G02F2201/122 ,  G02F2203/48

Abstract: An optical device (1000) comprises a multi-mode interference (MMI) region (912), a single optical input (908), a single optical output (910), a first electrode (1010) associated with the MMI device and a second electrode (902) located or a face (914) of a semiconductor substrate (906) opposite another face on which the MMI region (912) is formed, the first electrode (1010) and the second electrode (902) being arranged to apply an electric field to the MMI region (912), thereby to cause absorption of light propagating through the MMI device. The device may be operated as an optical attenuator or an optical electro-absorption modulator (EAM). The MMI region allows the spreading of light coupled through the input (908) within the MMI region (912), thus decreasing the optical power absorption per unit area in the device and improving thereby the thermal dissipation.

Abstract translation: 光学设备（1000）包括多模式干扰（MMI）区域（912），单个光学输入（908），单个光学输出（910），与所述MMI设备相关联的第一电极（1010）和第二 电极（902）或半导体衬底（906）的与形成有MMI区域（912）的另一面相对的面（914），第一电极（1010）和第二电极（902）被布置成施加 电场到MMI区域（912），从而引起通过MMI器件传播的光的吸收。 该器件可以作为光衰减器或光电吸收调制器（EAM）来操作。 MMI区域允许通过输入（908）耦合在MMI区域（912）内的光的扩展，从而降低器件中每单位面积的光功率吸收，从而改善热耗散。

公开(公告)号：WO2007034141A1

公开(公告)日：2007-03-29

申请号：PCT/GB2006/003371

申请日：2006-09-13

Applicant: BOOKHAM TECHNOLOGY PLC ,  PAN, Qi ,  BARNARD, Joseph

Inventor： PAN, Qi ,  BARNARD, Joseph

IPC: G02F1/01 ,  H04B10/155 ,  H03F3/45

CPC classification number: H03F3/45183 ,  G02F1/0121 ,  H03F1/30 ,  H03F3/189 ,  H03F3/195 ,  H03F3/45475 ,  H03F2200/451

Abstract: A circuit including a pair of radio frequency signal devices to each of which are connected in parallel a respective input or output and a respective dc bias input device for biasing the respective radio frequency signal device; each dc bias input device including a radio frequency transistor and at least two different types of inductors.

Abstract translation: 一种包括一对射频信号装置的电路，每个射频信号装置并联连接相应的输入或输出以及相应的直流偏置输入装置，用于偏置各个射频信号装置; 每个直流偏置输入装置包括射频晶体管和至少两种不同类型的电感器。

公开(公告)号：WO2006059086A1

公开(公告)日：2006-06-08

申请号：PCT/GB2005/004574

申请日：2005-11-30

Applicant: BOOKHAM TECHNOLOGY PLC ,  FRASER, James ,  POPE, Stephen ,  HALL, Jonathan

Inventor： FRASER, James ,  POPE, Stephen ,  HALL, Jonathan

IPC: H01S5/0687 ,  G01J9/00

CPC classification number: G01J9/00

Abstract: A monitoring device for monitoring a light beam comprises a beam splitter, a photodetector and an electrical conductor member, wherein the photodetector and the electrical conductor member are located directly or indirectly on the beam splitter, and the electrical conductor member is electrically connected to the photodetector. The electrical conductor member may be a conductive track on the beam splitter or it may be a tile or other substrate carrying a conductive track or other electrical conductor. The monitoring device may be a wavelength locker for a laser.

Abstract translation: 用于监视光束的监视装置包括分束器，光电检测器和电导体构件，其中光电检测器和电导体构件直接或间接地位于分束器上，并且电导体构件电连接到光电检测器 。 电导体构件可以是分束器上的导电轨道，或者其可以是承载导电轨道或其它电导体的瓦或其它基底。 监视装置可以是用于激光的波长锁定器。

公开(公告)号：WO2004086572A3

公开(公告)日：2006-05-11

申请号：PCT/US2004009067

申请日：2004-03-24

Applicant: BOOKHAM TECHNOLOGY PLC ,  NGUYEN HOANG

Inventor： NGUYEN HOANG ,  CHOI DONG HO ,  PACE ROSS D ,  TRAN THANG ,  WANG WEIZHI ,  LIM ALAN

IPC: H01S3/10 ,  H01S20060101 ,  H01S3/08 ,  H01S3/09 ,  H01S3/139 ,  H01S5/06 ,  H01S5/068 ,  H01S5/14

CPC classification number: H01S5/06 ,  H01S3/139 ,  H01S5/0617 ,  H01S5/0654 ,  H01S5/06821 ,  H01S5/141 ,  H01S5/143

Abstract: Tunable external cavity lasers (510) are used in applications such as interferometry, FM spectroscopy, and optical communications equipment testing. Mode hop free high bandwidth frequency modulation operation is desired in a tunable external cavity laser. This application describes new and novel techniques for controlling the output wavelength of a tunable external cavity laser (510) while suppressing mode hop.

Abstract translation: 可调谐外腔激光器（510）用于干涉测量，FM光谱和光通信设备测试等应用中。 在可调谐的外腔激光器中需要模式跳跃高带宽频率调制操作。 该应用描述了用于在抑制模式跳跃的同时控制可调谐外腔激光器（510）的输出波长的新的和新颖的技术。