公开(公告)号：US20190190234A1

公开(公告)日：2019-06-20

申请号：US16285738

申请日：2019-02-26

Applicant: Rhode Island Council on Postsecondary Education

Inventor： Tao Wei ,  Zheyi Yao ,  Yan Sun

IPC: H01S5/0683 ,  H01S5/042

CPC classification number: H01S5/06223 ,  H01S5/042 ,  H01S5/0617 ,  H01S5/0622 ,  H01S5/06817 ,  H01S5/0683 ,  H01S5/06835 ,  H01S5/0687

Abstract: The present disclosure provides a unique digitally integrated, self-trained pre-distortion curve generation method and apparatus for semiconductor lasers (SCLs) to generate linearly swept optical signals that are applicable to a wide range of sweep velocities and semiconductor laser types. The method requires no prior knowledge of the frequency response of the laser and is highly accurate.

公开(公告)号：US09787057B2

公开(公告)日：2017-10-10

申请号：US14861299

申请日：2015-09-22

Applicant: Texas Instruments Incorporated

Inventor： Douglas Warren Dean ,  Craig Matthew Brannon

IPC: G11B7/126 ,  H01S5/042 ,  H01S5/068 ,  H03K17/60 ,  H03K5/08 ,  H03K5/12

CPC classification number: H01S5/06817 ,  G11B7/126 ,  H01S5/042 ,  H01S5/06825 ,  H03K5/086 ,  H03K5/12 ,  H03K17/60

Abstract: A damping circuit having an input terminal and an output terminal is described. The damping circuit comprises a driver having an input and an output; an RC circuit coupled between the input terminal and the output; and a resistor coupled between the output and the output terminal, wherein the RC circuit delays passing a signal from the output terminal to the input terminal and a low impedance associated with the driver generally reduces ringing.

公开(公告)号：US09680288B2

公开(公告)日：2017-06-13

申请号：US14865876

申请日：2015-09-25

Applicant: FUJITSU LIMITED

Inventor： Susumu Kinoshita ,  Setsuo Yoshida

IPC: H01S5/068 ,  H01S5/062 ,  H01S5/0683 ,  H01S5/06 ,  H04B10/29 ,  H01S5/024 ,  H01S5/50

CPC classification number: H01S5/06817 ,  H01S5/02407 ,  H01S5/0617 ,  H01S5/06223 ,  H01S5/0683 ,  H01S5/50 ,  H01S2301/06

Abstract: An optical amplification device includes: a semiconductor optical amplifier; a first detector that detects an input optical power of the semiconductor optical amplifier; a second detector that detects an output optical power of the semiconductor optical amplifier; and a controller that controls a driving current of the semiconductor optical amplifier, wherein the controller supplies a predetermined driving current to the semiconductor optical amplifier when an optical signal is not input to the semiconductor optical amplifier, the second detector detects an optical power of Amplified Spontaneous Emission (ASE) output from the semiconductor optical amplifier when the predetermined driving current is supplied to the semiconductor optical amplifier, and the controller controls the driving current of the semiconductor optical amplifier based on the input optical power of the semiconductor optical amplifier detected by the first detector, and the optical power of the ASE.

公开(公告)号：US09608404B2

公开(公告)日：2017-03-28

申请号：US15077103

申请日：2016-03-22

Applicant: FANUC CORPORATION

Inventor： Yoshinori Sakai ,  Shuuji Kudou

IPC: H01S3/00 ,  H01S5/042 ,  H01S5/026 ,  H01S3/091 ,  H01S3/13 ,  H01S3/10 ,  H02M7/217 ,  H02M1/00

CPC classification number: H01S5/042 ,  H01S3/0912 ,  H01S3/10015 ,  H01S3/1305 ,  H01S5/0261 ,  H01S5/06808 ,  H01S5/06817 ,  H02M7/217 ,  H02M2001/0009

Abstract: A constant current control power supply of an embodiment of the present invention includes a switching regulator that includes a switching circuit having a switching device and a rectifier device, a smoothing circuit having reactors and capacitors, a current detection circuit, and a control circuit, for outputting a constant current in accordance with a command value from a controller. When ON indicates a case where the command value commands an output of a higher current than a predetermined value and OFF indicates a case where the command value commands an output of a lower current than the predetermined value, on condition that a pulse operation alternating between the ON and the OFF is inputted, the control circuit amplifies a variation in the command value by a predetermined amplification factor and adds the amplified variation to the command value, and attenuates the added variation with a predetermined time constant.

公开(公告)号：US20160254646A1

公开(公告)日：2016-09-01

申请号：US15053876

申请日：2016-02-25

Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY

Inventor： Jiang LI ,  Kerry VAHALA

IPC: H01S5/0687 ,  H01S5/04 ,  H01S5/062 ,  H01S5/068 ,  H01S5/40 ,  H01S5/00

CPC classification number: H01S5/0687 ,  H01S3/0085 ,  H01S3/0627 ,  H01S3/06791 ,  H01S3/1304 ,  H01S3/1305 ,  H01S3/1307 ,  H01S3/2391 ,  H01S3/30 ,  H01S5/0078 ,  H01S5/041 ,  H01S5/0623 ,  H01S5/06817 ,  H01S5/40 ,  H03B17/00 ,  H03L7/00

Abstract: Microwave-frequency signal generation by generating multiple sideband optical signals separated by phase-modulation frequency fM, generating beat signals between one or two sidebands and one or two optical reference signals, generating a loop-filtered error signal by comparing an electrical reference signal to one of the beat signals or their difference, and controlling with the error signal in a phase-locked loop arrangement a voltage-controlled oscillator (VCO) that drives the sideband generation at the frequency fM. A portion of the VCO output is the generated microwave-frequency signal.

Abstract translation: 通过产生由相位调制频率fM分离的多个边带光信号产生微波频率信号，在一个或两个边带之间产生拍频信号和一个或两个光参考信号，通过将电参考信号与一个电参考信号进行比较来产生环路滤波误差信号 的差分信号或它们的差异，并且以锁相环布置中的误差信号进行控制，该压控振荡器（VCO）以频率fM驱动边带产生。 VCO输出的一部分是产生的微波频率信号。

公开(公告)号：US20160013781A1

公开(公告)日：2016-01-14

申请号：US14861348

申请日：2015-09-22

Applicant: Texas Instruments Incorporated

Inventor： Douglas Warren Dean ,  Craig Matthew Brannon

IPC: H03K5/12 ,  H01S5/068 ,  H03K17/60

CPC classification number: H01S5/06817 ,  G11B7/126 ,  H01S5/042 ,  H01S5/06825 ,  H03K5/086 ,  H03K5/12 ,  H03K17/60

Abstract: A damping circuit having an input terminal and an output terminal is described. The damping circuit comprises a driver having an input and an output; an RC circuit coupled between the input terminal and the output; and a resistor coupled between the output and the output terminal, wherein the RC circuit delays passing a signal from the output terminal to the input terminal and a low impedance associated with the driver generally reduces ringing.

公开(公告)号：US20150349485A1

公开(公告)日：2015-12-03

申请号：US14653386

申请日：2013-12-19

Applicant: FAZ TECHNOLOGY LIMITED

Inventor： Ibrahim Selwan ,  John O'Dowd ,  Tom Farrell ,  Martin Farnan

IPC: H01S3/13 ,  G01D18/00 ,  G01D5/26

CPC classification number: H01S5/068 ,  G01D5/268 ,  G01D18/00 ,  H01S3/1303 ,  H01S5/0021 ,  H01S5/06804 ,  H01S5/06817 ,  H01S5/06821 ,  H01S5/0687 ,  H01S5/1092

Abstract: The invention provides a system and a method for wavelength referencing and polarization mitigation. An optical wavelength tunable laser source is swept in a number of contiguous, overlapping sweep segments. A coarse reference wavelength section produces a reference signal that defines at least one absolute wavelength within a sweep segment. A fine wavelength reference section produces a periodic wavelength reference signal that defines a plurality of equidistant wavelengths within each sweep segment with an indeterminate offset relative to the absolute wavelength(s) of the coarse reference wavelength section. The free spectral range of the fine wavelength reference section is smaller than the spacing between subsequent absolute reference wavelengths of the coarse reference wavelength section. This arrangement allows reducing the minimum required overlap between contiguous sweep segments.

Abstract translation: 本发明提供了一种用于波长参考和极化减轻的系统和方法。 光波长可调激光源扫描在多个连续的，重叠的扫描段中。 粗略参考波长部分产生定义扫描段内的至少一个绝对波长的参考信号。 精细波长参考部分产生周期波长参考信号，该周期波长参考信号在每个扫描段内定义多个等距波长，相对于粗略参考波长部分的绝对波长具有不确定的偏移。 精细波长参考部分的自由光谱范围小于粗参考波长部分的后续绝对参考波长之间的间隔。 这种布置允许减少连续扫掠段之间所需的最小重叠。

公开(公告)号：US20130215919A1

公开(公告)日：2013-08-22

申请号：US13770831

申请日：2013-02-19

Applicant: UNIVERSITY OF SOUTHERN CALIFORNIA

Inventor： Firooz Aflatouni ,  Hossein Hashemi

IPC: H01S3/13

CPC classification number: H01S3/1307 ,  G01S7/484 ,  H01S5/005 ,  H01S5/0085 ,  H01S5/0654 ,  H01S5/06817 ,  H01S5/06821 ,  H01S5/0687 ,  H01S5/12

Abstract: Various examples of feed-forward systems that reduce phase noise in a laser field generated by a laser. These include feed-forward systems that utilize phase and/or frequency discriminators, filters, integrators, voltage controlled oscillators (VCOs), current controlled oscillators (CCOs), phase modulators, and/or amplitude modulators. It also includes systems that use both feed-forward and feedback phase noise reduction systems, tunable semiconductor lasers, and multiple, sequential feed-forward systems.

Abstract translation: 前馈系统的各种示例，其减少由激光产生的激光场中的相位噪声。 这些包括利用相位和/或频率鉴别器，滤波器，积分器，压控振荡器（VCO），电流控制振荡器（CCO），相位调制器和/或幅度调制器的前馈系统。 它还包括使用前馈和反馈相位降噪系统，可调谐半导体激光器和多个顺序前馈系统的系统。

公开(公告)号：US08472109B2

公开(公告)日：2013-06-25

申请号：US12636209

申请日：2009-12-11

Applicant: Shinsuke Tanaka ,  Shigeaki Sekiguchi

Inventor： Shinsuke Tanaka ,  Shigeaki Sekiguchi

IPC: H01S5/028 ,  H01S5/026 ,  H01S5/068 ,  H01S5/34 ,  H01S5/22 ,  H01S5/10

CPC classification number: H01S5/0288 ,  H01S5/0268 ,  H01S5/06817 ,  H01S5/101 ,  H01S5/1032 ,  H01S5/2206 ,  H01S5/34 ,  H01S5/50 ,  H01S5/5045 ,  H01S2301/02

Abstract: A semiconductor optical amplifier includes a semiconductor substrate; an optical waveguide that includes an active layer formed on the semiconductor substrate; and a wavelength selective reflection film that is formed on an end face where signal light is incident on the optical waveguide the wavelength selective reflection film allows transmission of the signal light, and reflects light of any wavelength other than the signal light.

Abstract translation: 半导体光放大器包括半导体衬底; 包括形成在所述半导体衬底上的有源层的光波导; 以及波长选择反射膜，其形成在信号光入射到光波导上的端面上，所述波长选择反射膜允许信号光的透射，并且反射除了信号光之外的任何波长的光。

公开(公告)号：US20110019708A1

公开(公告)日：2011-01-27

申请号：US12895979

申请日：2010-10-01

Applicant: Alex A. Behfar ,  Alfred T. Schremer, JR. ,  Cristian B. Stagarescu

Inventor： Alex A. Behfar ,  Alfred T. Schremer, JR. ,  Cristian B. Stagarescu

IPC: H01S5/10 ,  H01S3/083 ,  G02F1/17

CPC classification number: H01S5/0287 ,  G02B6/12004 ,  H01S5/005 ,  H01S5/0085 ,  H01S5/0656 ,  H01S5/06817 ,  H01S5/0687 ,  H01S5/1021 ,  H01S5/1071 ,  H01S5/1082 ,  H01S5/1085 ,  H01S5/125 ,  H01S5/14

Abstract: Unidirectionality of lasers is enhanced by forming one or more etched gaps (78, 80) in the laser cavity. The gaps may be provided in any segment of a laser, such as any leg of a ring laser, or in one leg (62) of a V-shaped laser (60). A Brewster angle facet at the distal end of a photonic device coupled to the laser reduces back-reflection into the laser cavity. A distributed Bragg reflector is used at the output of a laser to enhance the side-mode suppression ratio of the laser.

Abstract translation: 通过在激光腔中形成一个或多个蚀刻间隙（78,80）来增强激光器的单向性。 可以在激光器的任何部分（例如环形激光器的任何腿部）中或在V形激光器（60）的一个腿部（62）中提供间隙。 耦合到激光器的光子器件的远端处的布鲁斯特角小面减少反射到激光腔。 在激光器的输出处使用分布式布拉格反射器来增强激光器的侧模抑制比。