公开(公告)号：US11835337B2

公开(公告)日：2023-12-05

申请号：US17646080

申请日：2021-12-27

Applicant: Lumentum Technology UK Limited

Inventor： Adrian Perrin Janssen

IPC: G01B9/02 ,  G01B9/02056 ,  H04B10/572 ,  G01J3/453 ,  H01S5/0687

CPC classification number: G01B9/02051 ,  G01B9/02058 ,  G01J3/453 ,  H04B10/572 ,  G01B9/02 ,  H01S5/0687

Abstract: There is described an interferometer for use in an optical locker. The interferometer comprises at least two transparent materials having different thermal path length sensitivities. The interferometer is configured such that an input beam is split by the interferometer into first and second intermediate beams, which recombine to form an output beam, the first and second intermediate beams travelling along respective first and second intermediate beam paths which do not overlap. At least one of the intermediate beam paths passes through at least two of the transparent materials. A length of each intermediate beam path which passes through each transparent material is selected such that an optical path difference between the first and second intermediate beam path is substantially independent of temperature.

公开(公告)号：US11681110B2

公开(公告)日：2023-06-20

申请号：US17449695

申请日：2021-10-01

Applicant: Lumentum Technology UK Limited

Inventor： Adrian Perrin Janssen

IPC: G02B6/42 ,  G01B9/02

CPC classification number: G02B6/4214 ,  G01B9/02051 ,  G02B6/421

Abstract: Apparatus for monitoring the output of an optical system. The apparatus comprises first and second fibre optic sections, a reflective coating, and a detector. The first fibre optic section has a first cladding and a first core, and is configured to receive light from the optical system at one end and has at the other end a first angled, polished face. The second fibre optic section has a second cladding and a second core, and has at one end a second angled, polished face. The first and second fibre optic sections are arranged such that the first and second angled, polished faces are substantially parallel and adjacent and the first and second cores are substantially aligned. The reflective coating is applied to the first or second angled, polished face, and is configured to reflect a portion of light transmitted through the first core. The detector is arranged to receive the reflected light.

公开(公告)号：US11215440B2

公开(公告)日：2022-01-04

申请号：US16839488

申请日：2020-04-03

Applicant: Lumentum Technology UK Limited

Inventor： Adrian Perrin Janssen

IPC: G01B9/02 ,  H04B10/572 ,  G01J3/453 ,  H01S5/0687

Abstract: There is described an interferometer for use in an optical locker. The interferometer comprises at least two transparent materials having different thermal path length sensitivities. The interferometer is configured such that an input beam is split by the interferometer into first and second intermediate beams, which recombine to form an output beam, the first and second intermediate beams travelling along respective first and second intermediate beam paths which do not overlap. At least one of the intermediate beam paths passes through at least two of the transparent materials. A length of each intermediate beam path which passes through each transparent material is selected such that an optical path difference between the first and second intermediate beam path is substantially independent of temperature.

公开(公告)号：US12164129B2

公开(公告)日：2024-12-10

申请号：US16604921

申请日：2018-09-27

Applicant: Lumentum Technology UK Limited

Inventor： Adrian Perrin Janssen

IPC: G02B5/28 ,  G02B6/293

Abstract: An optical filter comprising a first lens, and first and second optical elements. The first lens has an optical axis, configured to focus beams propagating parallel to the optical axis at a focal point. The first optical element has a first semi-reflective surface, the first semi-reflective surface being curved and having a first radius of curvature around a first centre of curvature on the optical axis. The second optical element has a second semi-reflective surface. The first radius of curvature is between 1 and 10,000 times the distance between the first semi reflective surface and the focal point along the optical axis. The first and second semi-reflective surfaces are arranged to form a resonator. The first lens and the first and second semi-reflective surfaces are arranged along the optical axis such that light is transmittable along an optical path through the lens and the resonator. The optical filter further comprises one or more expansion elements located outside of the optical path, and arranged such that expansion of the expansion elements causes relative movement of the first and second semi-reflective surfaces.

公开(公告)号：US11143819B2

公开(公告)日：2021-10-12

申请号：US16652651

申请日：2019-01-30

Applicant: Lumentum Technology UK Limited

Inventor： Adrian Perrin Janssen

IPC: G02B6/293 ,  H04B10/077 ,  H04B10/25

Abstract: An optical filter assembly comprising: a tuneable optical filter; a beam splitter assembly configured to split an input beam into an output beam, a reference beam, and a probe beam, and to direct the output beam and the probe beam through the tuneable optical filter, such that the probe beam is at an angle α to the output beam; a first detector configured to measure the intensity S0 of the reference beam; a second detector configured to measure the intensity S1 of the probe beam after it has passed through the filter; a controller configured to adjust the tuneable optical filter on the basis of the measured intensities of the reference and probe beams.

公开(公告)号：US11060913B2

公开(公告)日：2021-07-13

申请号：US16620305

申请日：2018-06-11

Applicant: Lumentum Technology UK Limited

Inventor： Adrian Perrin Janssen

IPC: G01J3/26 ,  G01J3/02 ,  G02B5/28 ,  G02B7/00 ,  G02B6/293 ,  G02B26/00

Abstract: According to a first aspect of the present invention, there is provided an optical filter. The optical filter comprises first and second optical elements, and one or more expansion elements. The first and second optical elements are arranged along a common axis, each terminates in a flat surface perpendicular to the axis. The flat surfaces are separated by a gap having a width d, such that the flat surfaces form a Fabry-Perot etalon and light is transmittable along an optical path through the elements and the etalon. The one or more expansion elements are connected to the optical elements, located outside the optical path and extend parallel to the axis with a length greater than the width of the gap. The expansion elements comprise a material having a linear thermal coefficient of expansion different to that of the optical elements such that a difference in expansion of the expansion elements and the optical elements causes relative movement of the flat surfaces along the axis resulting in a change in the width of the gap.