公开(公告)号：US11536610B2

公开(公告)日：2022-12-27

申请号：US16943056

申请日：2020-07-30

Applicant: Keysight Technologies, Inc.

Inventor： Marcel Zeiler ,  Bernd Nebendahl

IPC: G02B6/293 ,  G01J3/45 ,  G02B6/12

Abstract: A photonic integrated circuit (PIC) for determining a wavelength of an input signal is disclosed. The PIC comprises: a substrate; a first Mach-Zehnder Interferometer (MZI) disposed over the substrate, comprising first optical waveguides having a first optical path length difference, and configured to receive a first output optical signal from a light source. The PIC also comprises a second Mach-Zehnder Interferometer (MZI) disposed over the substrate, comprising second optical waveguides having a second optical path length difference, which is greater than the first optical path length difference, and configured to receive a second output optical signal from the light source.

公开(公告)号：US12283986B2

公开(公告)日：2025-04-22

申请号：US18127184

申请日：2023-03-28

Applicant: Keysight Technologies, Inc.

Inventor： Marcel Zeiler ,  Bernd Nebendahl

IPC: G02B6/293 ,  H04B10/079 ,  H04B10/61

Abstract: An apparatus for determining a wavelength and a power of an input signal is described. The apparatus comprises a memory which stores instructions, which when executed by the processor, cause the processor to: recover a first phase for a first Mach-Zehnder Interferometer MZI; recover a second phase for a second MZI; subtract the first phase from the second phase to provide a phase difference; determine an unwrapped phase difference as a function of wavelength; determine a coarse wavelength; and determine a first wavelength for the first FSR and a second wavelength from the second FSR; and average the first and second wavelengths to determine the wavelength of the input signal.

公开(公告)号：US20220365400A1

公开(公告)日：2022-11-17

申请号：US17874513

申请日：2022-07-27

Applicant: Keysight Technologies, Inc.

Inventor： Marcel Zeiler ,  Bernd Nebendahl

IPC: G02F1/21 ,  G02F1/225

Abstract: An optical device having a wavelength measurement section and an SMRS measurement section is disclosed. The wavelength measurement section includes a MZI, which includes first optical waveguides having a first optical path length difference. The wavelength measurement section also includes a second MZI, which includes second optical waveguides having a second optical path length difference. The second optical path length difference is greater than the first optical path length difference. The SMRS includes a filter adapted to suppress a primary laser mode of the second output optical signal and to pass a remaining portion of the second output signal to determine an SMRS based on an optical power of the main laser mode from the wavelength and power measurement stage, and an optical power of the remaining portion of the second output optical signal.

公开(公告)号：US20210126427A1

公开(公告)日：2021-04-29

申请号：US17037439

申请日：2020-09-29

Applicant: Keysight Technologies, Inc.

Inventor： Bernd Nebendahl

IPC: H01S5/0683 ,  H04B10/50 ,  H04B10/66 ,  H04B10/572 ,  H01S3/106

Abstract: An apparatus includes an optical splitter configured to receive an optical signal and to split the input optical signal to provide a first and a second optical signal. The apparatus further includes an interferometer comprising a first arm and a second arm, with the first arm being configured to receive the first optical signal, and the second arm being configured to receive the second optical signal. Notably a portion of the first arm is exposed to a reference gas that attenuates light of a characteristic wavelength. The apparatus further includes an optical coupler configured to receive an output optical signal from the first arm, and an output optical signal from the second arm and to provide a third optical signal; and a photodetector configured to receive the third optical signal, and to provide a photocurrent. The photocurrent increases when the difference between the characteristic wavelength and the wavelength of the optical signals increases. The apparatus also comprises a feedback control circuit configured to change the properties of the laser to be locked until an error signal indicative of the difference between the characteristic wavelength and the wavelength of the laser is substantially zero.

公开(公告)号：US20190293872A1

公开(公告)日：2019-09-26

申请号：US16245871

申请日：2019-01-11

Applicant: Keysight Technologies, Inc.

Inventor： Bernd Nebendahl

IPC: G02B6/293 ,  H04B10/572 ,  H01S3/13 ,  H01S3/00 ,  G02B6/35

Abstract: A tunable filter device includes a wavelength dependent splitter; a tuning element that tunes a characteristic wavelength of the wavelength dependent splitter to a wavelength of an optical signal; and a first optical coupler that splits the optical signal into an input optical signal input to the wavelength dependent splitter and a reference optical signal, where a first output outputs a band stop filtered portion and a second output outputs a band pass filtered portion of the input optical signal. The device further includes a second optical coupler that combines the reference optical signal with the band stopped filtered portion to provide a coupled optical signal; a photodiode that provides at a photocurrent indicating a difference between the wavelength of the optical signal and the characteristic wavelength; and a control loop that provides a control signal for automatically tuning the characteristic wavelength based at least in part on the photocurrent.

公开(公告)号：US12174509B2

公开(公告)日：2024-12-24

申请号：US17874513

申请日：2022-07-27

Applicant: Keysight Technologies, Inc.

Inventor： Marcel Zeiler ,  Bernd Nebendahl

IPC: G02B6/293 ,  G02F1/21 ,  G02F1/225 ,  G02B6/12

Abstract: An optical device having a wavelength measurement section and an SMRS measurement section is disclosed. The wavelength measurement section includes a MZI, which includes first optical waveguides having a first optical path length difference. The wavelength measurement section also includes a second MZI, which includes second optical waveguides having a second optical path length difference. The second optical path length difference is greater than the first optical path length difference. The SMRS includes a filter adapted to suppress a primary laser mode of the second output optical signal and to pass a remaining portion of the second output signal to determine an SMRS based on an optical power of the main laser mode from the wavelength and power measurement stage, and an optical power of the remaining portion of the second output optical signal.

公开(公告)号：US20230239046A1

公开(公告)日：2023-07-27

申请号：US18127184

申请日：2023-03-28

Applicant: Keysight Technologies, Inc.

Inventor： Marcel Zeiler ,  Bernd Nebendahl

IPC: H04B10/079 ,  H04B10/61

CPC classification number: H04B10/07957 ,  H04B10/07955 ,  H04B10/614

Abstract: An apparatus for determining a wavelength and a power of an input signal is described. The apparatus comprises a memory which stores instructions, which when executed by the processor, cause the processor to: recover a first phase for a first Mach-Zehnder Interferometer MZI; recover a second phase for a second MZI; subtract the first phase from the second phase to provide a phase difference; determine an unwrapped phase difference as a function of wavelength; determine a coarse wavelength; and determine a first wavelength for the first FSR and a second wavelength from the second FSR; and average the first and second wavelengths to determine the wavelength of the input signal.

公开(公告)号：US20210131873A1

公开(公告)日：2021-05-06

申请号：US16943056

申请日：2020-07-30

Applicant: Keysight Technologies, Inc.

Inventor： Marcel Zeiler ,  Bernd Nebendahl

IPC: G01J3/45 ,  G02B6/12

Abstract: A photonic integrated circuit (PIC) for determining a wavelength of an input signal is disclosed. The PIC comprises: a substrate; a first Mach-Zehnder Interferometer (MZI) disposed over the substrate, comprising first optical waveguides having a first optical path length difference, and configured to receive a first output optical signal from a light source. The PIC also comprises a second Mach-Zehnder Interferometer (MZI) disposed over the substrate, comprising second optical waveguides having a second optical path length difference, which is greater than the first optical path length difference, and configured to receive a second output optical signal from the light source.

公开(公告)号：US10732352B2

公开(公告)日：2020-08-04

申请号：US16245871

申请日：2019-01-11

Applicant: Keysight Technologies, Inc.

Inventor： Bernd Nebendahl

IPC: G02B6/293 ,  H04B10/572 ,  G02B6/35 ,  H01S3/00 ,  H01S3/13

Abstract: A tunable filter device includes a wavelength dependent splitter; a tuning element that tunes a characteristic wavelength of the wavelength dependent splitter to a wavelength of an optical signal; and a first optical coupler that splits the optical signal into an input optical signal input to the wavelength dependent splitter and a reference optical signal, where a first output outputs a band stop filtered portion and a second output outputs a band pass filtered portion of the input optical signal. The device further includes a second optical coupler that combines the reference optical signal with the band stopped filtered portion to provide a coupled optical signal; a photodiode that provides at a photocurrent indicating a difference between the wavelength of the optical signal and the characteristic wavelength; and a control loop that provides a control signal for automatically tuning the characteristic wavelength based at least in part on the photocurrent.

公开(公告)号：US10389450B2

公开(公告)日：2019-08-20

申请号：US14015121

申请日：2013-08-30

Applicant: Keysight Technologies, Inc.

Inventor： Bernd Nebendahl

IPC: H04B10/61

Abstract: A method of processing an optical input signal comprises transmitting the optical input signal through first and second signal paths, mixing the optical input signal with first and second local oscillator (LO) signals in the respective first and second signal paths to produce first and second electrical signals corresponding to different portions of a frequency spectrum of the optical input signal, and combining the first and second electrical signals to produce a coherent time-domain output signal.