公开(公告)号：US20170012705A1

公开(公告)日：2017-01-12

申请号：US15235075

申请日：2016-08-11

Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY ,  GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE, THE NATI

Inventor： Kerry VAHALA ,  Scott DIDDAMS ,  Jiang LI ,  Xu YI ,  Hansuek LEE

IPC: H04B10/2507 ,  H04B10/2575 ,  H04L7/00

CPC classification number: H04B10/2507 ,  H03B17/00 ,  H03L7/08 ,  H03L7/16 ,  H04B10/2504 ,  H04B10/2575 ,  H04B10/503 ,  H04B2210/006 ,  H04L7/0075 ,  H04L7/0091

Abstract: A microwave-frequency source at frequency fM comprises: a dual optical-frequency reference source, an electro-optic sideband generator, an optical bandpass filter, an optical detector, a reference oscillator, an electrical circuit, and a voltage-controlled oscillator (VCO). The sideband generator modulates dual optical reference signals at v2 and v1 to generate sideband signals at v1±n1fM and v2±n2fM. The bandpass filter transmits sideband signals at v1+N1fM and v2−N2fM. The optical detector generates a beat note at (v2−N2fM)−(v1+N1fM). The beat note and a reference oscillator signal are processed by the circuit to generate a loop-filtered error signal to input to the VCO. Output of the VCO at fM drives the sideband generator and forms the microwave-frequency output signal. The resultant frequency division results in reduced phase noise on the microwave-frequency signal.

Abstract translation: 频率fM的微波频率源包括：双光频参考源，电光边带发生器，光带通滤波器，光检测器，参考振荡器，电路和压控振荡器（VCO ）。 边带发生器在v2和v1处调制双光参考信号，以在v1±n1fM和v2±n2fM产生边带信号。 带通滤波器发送v1 + N1fM和v2-N2fM的边带信号。 光学检测器在（v2-N2fM） - （v1 + N1fM）处产生节拍。 拍音和参考振荡器信号由电路处理以产生环路滤波的误差信号以输入到VCO。 在fM处的VCO的输出驱动边带发生器并形成微波频率输出信号。 所得到的分频导致微波频率信号上的相位噪声减小。

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：US20160190769A1

公开(公告)日：2016-06-30

申请号：US15018824

申请日：2016-02-08

Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY

Inventor： Jiang LI ,  Hansuek LEE ,  Tong CHEN ,  Kerry VAHALA

IPC: H01S5/227 ,  H01S3/17 ,  H01S3/0941 ,  H01S5/10 ,  H01S3/30 ,  H01S3/094

CPC classification number: H01S5/2275 ,  H01S3/0632 ,  H01S3/083 ,  H01S3/094057 ,  H01S3/0941 ,  H01S3/176 ,  H01S3/30 ,  H01S5/1075 ,  H01S2301/02

Abstract: A highly-coherent chip-based laser generating system includes a disk resonator incorporating a wedge structure fabricated from a silicon dioxide layer of a chip. The disk resonator is operable to generate a highly-coherent laser from a low-coherence optical pump input provided at an optical power level as low as 60 μW. The disk resonator is fabricated with sub-micron cavity size control that allows generation of a highly-coherent laser using a controllable Stimulated Brillouin Scattering process that includes matching of a cavity free-spectral-range to a Brillouin shift frequency in silica. While providing several advantages due to fabrication on a chip, the highly-coherent laser produced by the disk resonator may feature a Schawlow-Townes noise level as low as 0.06 Hz2/Hz (measured with the coherent laser at a power level of about 400 μW) and a technical noise that is at least 30 dB lower than the low-coherence optical pump input.

公开(公告)号：US20150029579A1

公开(公告)日：2015-01-29

申请号：US14513058

申请日：2014-10-13

Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY

Inventor： Jiang LI ,  Hansuek LEE ,  Tong CHEN ,  Kerry VAHALA

IPC: G02F1/35

CPC classification number: G02F1/353 ,  G02F1/2257 ,  G02F2201/063 ,  G02F2201/17 ,  G02F2201/58 ,  G02F2202/09 ,  G02F2202/105 ,  G02F2203/15 ,  G02F2203/54 ,  G02F2203/56 ,  G02F2203/69

Abstract: A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.

Abstract translation: 制造在芯片上的消除不利的回流工艺的频率梳发生器包括具有作为由芯片的二氧化硅层制成的楔形结构的一部分的波导的超高Q盘谐振器。 磁盘谐振器允许产生低至2.6GHz和高达220GHz的模式间隔的频率梳。 盘式谐振器的表面损耗受限行为使抽水阈值对重复率的强烈依赖性解耦。

公开(公告)号：US20170302048A1

公开(公告)日：2017-10-19

申请号：US15387089

申请日：2016-12-21

Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY ,  HQPHOTONICS INC.

Inventor： Jiang LI ,  Kerry VAHALA

IPC: H01S3/067 ,  H01S3/13 ,  H01S3/11 ,  H01S3/094 ,  H01S3/30

CPC classification number: H01S3/06791 ,  G02B6/293 ,  G02B6/2934 ,  H01S3/06708 ,  H01S3/094003 ,  H01S3/094049 ,  H01S3/094096 ,  H01S3/1086 ,  H01S3/1109 ,  H01S3/1305 ,  H01S3/1312 ,  H01S3/302 ,  H03B17/00

Abstract: A stabilized laser source includes a fiber-ring Brillouin laser that incorporates a circulator for non-reciprocal operation and for launching of a pump optical signal. Most of the pump optical signal is launched in a forward direction and drives Brillouin laser oscillation in the backward direction, a portion of which exits via an optical coupler as the optical output of the laser source. A small fraction of the pump optical signal is launched in the backward direction via the optical coupler, and a fraction of that backward-propagating pump optical signal exits via the optical coupler as an optical feedback signal. A frequency-locking mechanism receives the optical feedback signal and controls the pump optical frequency to maintain resonant propagation of the backward-propagating pump optical signal. A second pump optical signal can be launched in the forward direction to generate a second Brillouin laser oscillation.