公开(公告)号：US20240159963A1

公开(公告)日：2024-05-16

申请号：US18054877

申请日：2022-11-11

Applicant: Cisco Technology, Inc.

Inventor： Tao LING ,  Shiyi CHEN ,  Jean-Luc J. TAMBASCO ,  Ravi S. TUMMIDI

IPC: G02B6/122

CPC classification number: G02B6/1228

Abstract: Embodiments herein describe optical splitters that receive an optical signal using a single mode waveguide where the signal is in a fundamental mode. An asymmetric taper can be used to convert a portion of the optical signal from the fundamental mode into a different order mode (e.g., the first-order mode). The optical splitter also includes an optical mode multiplexer with two branches. The portion of the optical signal having the first-order mode is transferred to a first branch of the optical mode mux while the remaining portion of the optical signal having the fundamental mode is transmitted using a second branch of the optical mode mux. Further, coupling the portion of the optical signal into the first branch converts the optical signal from the first-order mode back to the fundamental mode. Thus, both branches in the optical mode mux output optical signals in the fundamental mode.

公开(公告)号：US20250035839A1

公开(公告)日：2025-01-30

申请号：US18361710

申请日：2023-07-28

Applicant: Cisco Technology, Inc.

Inventor： Jean-Luc J. TAMBASCO ,  Mark A. WEBSTER

IPC: G02B6/122 ,  G02B6/126

Abstract: Embodiments herein describe a PSR that includes a rotator with two layers that are separated by a dielectric layer. A first layer of the rotator includes a first waveguide formed from a lower refractive index material (e.g., SiN) while a second layer of the rotator includes a second waveguide formed from a higher refractive index material (e.g., Si). An optical signal, which can include two optical modes (e.g., TE and TM modes), is then introduced into the first layer where the TM mode is rotated. At the end of the rotator, the first waveguide (which is the same waveguide that received the optical signal) includes the optical signal which is now in the same optical mode. That is, one of the optical modes is rotated so that the light is the same type of optical mode (e.g., TE).

公开(公告)号：US20250035841A1

公开(公告)日：2025-01-30

申请号：US18361751

申请日：2023-07-28

Applicant: Cisco Technology, Inc.

Inventor： Jean-Luc J. TAMBASCO

IPC: G02B6/125

Abstract: The present disclosure describes a crossover structure for an optical circuit and a method of operating the optical circuit. The optical circuit includes a first layer, a second layer, a first waveguide positioned in the first layer, and a second waveguide positioned in the second layer. The second waveguide includes a first section, a second section, and a third section. When viewed along an axis normal to the first layer and the second layer, the first section is positioned on a first side of the first waveguide, the third section is positioned on a second side of the first waveguide, and the second section overlaps with the first waveguide. A first rate of change of a first angle between the second section and the first waveguide varies across a length of the second section.