公开(公告)号：US20220390322A1

公开(公告)日：2022-12-08

申请号：US17341261

申请日：2021-06-07

Applicant: VIAVI SOLUTIONS INC.

Inventor： Luis Andre Neves Paiva FERNANDES ,  Robert Matthew ADAMS ,  Christopher Russell WAGNER ,  Joshua Benjamin Julius PHILIPSON ,  Eugene CHAN

IPC: G01M11/00 ,  G02F1/01

Abstract: According to examples, a system for measuring polarization dependent loss (PDL) for a device-under-test (DUT) may include a tunable laser, a polarization element and a power meter. The tunable laser may emit an optical signal to sweep across an optical band at a constant rate. The polarization element may scramble polarizations states of the optical signal emitted from the tunable laser. The power meter may take power measurements associated with the optical signal emitted from the tunable laser, wherein the power measurements from the power meter are used to determine a maximum insertion loss (IL) and a minimum insertion loss (IL) associated with the device-under-test (DUT). An average insertion loss (IL) and a polarization dependent loss (PDL) for the device-under-test (DUT) may be calculated based on the maximum insertion loss (IL) and the minimum insertion loss (IL) associated with the device-under-test (DUT).

公开(公告)号：US20250003798A1

公开(公告)日：2025-01-02

申请号：US18343469

申请日：2023-06-28

Applicant: VIAVI SOLUTIONS INC.

Inventor： Driss TOUAHRI ,  Luis Andre Neves Paiva FERNANDES

IPC: G01J3/18 ,  G01J3/02

Abstract: A monochromator apparatus in a grating-based optical spectrum analyzer (OSA) includes a diffraction grating, a reflector element, and a tunable spectral filter. The tunable spectral filter may include a band-pass filter, a low-pass filter, a high-pass filter, or a linear variable filter, for example. A spectral window of the filter may move synchronously with the scanning spectral window of the OSA. A high-pass filter implementation may be introduced during a subsequent portion of the OSA window before the optical ghost signal starts appearing. The filter may either be linearly scanned across the optical beam, angularly tuned, or introduced in a subsequent portion of the OSA scanning window.

公开(公告)号：US20240019721A1

公开(公告)日：2024-01-18

申请号：US18359678

申请日：2023-07-26

Applicant: VIAVI SOLUTIONS INC.

Inventor： Joshua PHILIPSON ,  Christopher Russell WAGNER ,  Luis Andre Neves Paiva FERNANDES

IPC: G02F1/01 ,  H04B10/532 ,  H04B10/2569 ,  H04J14/06 ,  G02B3/00 ,  G02B6/27

CPC classification number: G02F1/0136 ,  H04B10/532 ,  H04B10/2569 ,  H04J14/06 ,  G02B3/0087 ,  G02B6/2786 ,  G02F1/0139

Abstract: A polarization scrambler using a retardance element (RE) is disclosed. The polarization scrambler may include an optical fiber input to transmit an optical signal, and a beam expander to receive and expand the optical signal to create an expanded optical signal. The polarization scrambler may include a retardance element (RE) to cause a polarization scrambling effect on the expanded optical signal and to create a scrambled expanded optical signal. The polarization scrambler may include a beam reducer to receive and reduce the scrambled expanded optical signal to create a scrambled optical signal. The polarization scrambler may include an optical fiber output to receive scrambled optical signal. The optical fiber output may transmit the scrambled optical signal to one or more downstream optical components.