Apparatus and methods for launching an optical signal into multimode optical fiber
US7228032B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2005 |
| Grant date | Jun 5, 2007 |
| Priority date | — |
| Expiry date | Jan 12, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/3692
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The launch conditions (injected beam size/shape, radial/angular offset from the multimode fiber axis) may be varied to preferentially excite certain transverse modes of multimode optical fiber. To reduce multimode dispersion in the fiber, modes are excited having smaller amplitudes near fiber index defects. Launch conditions may be controlled using a substrate with grooves for launching and receiving fibers, a planar waveguide formed on a substrate along with a groove for aligning the multimode fiber and waveguide, or free-space optical components. A waveguide may provide the desired injected beam size/shape. Spatially selective material processing enables accurate alignment of the groove(s) (and hence the fiber(s) therein), yielding the desired radial/angular offsets. Radial and azimuthal angular offset launch may be employed for constructing an optical mode conditioner, a transmit optical subassembly (TOSA), and other optical devices, assemblies, and subassemblies that launch an optical signal into a multimode optical fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.