Frequency domain method and system for measuring modal bandwidth, chromatic dispersion, and skew of optical fibers
US12267106B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 2022 |
| Grant date | Apr 1, 2025 |
| Priority date | — |
| Expiry date | Jul 7, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/25
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method including transmitting an intensity-modulated light through a mode conditioner to generate a mode-conditioned intensity-modulated light in one or a plurality of launch conditions and transmitting the mode-conditioned intensity-modulated light through a multimode optical fiber under test (FUT) to excite a plurality of modes of the FUT. The method further includes converting the mode-conditioned intensity-modulated light transmitted through the FUT into an electrical signal, measuring, based on the electrical signal, a complex transfer function CTF(f) of the FUT, and obtaining an output pulse based on the measured complex transfer function CTF(f) from one or a plurality of launch conditions and an assumed input pulse using the equation: Pout (t)=−1(CTF(f)*(Pin(t))). Wherein, Pout (t) is the output pulse, −1(CTF(f)*(Pin(t))) is the inverse Fourier transform of the function CTF(f)*(Pin (t)), and (Pin(t)) is the Fourier transform of the assumed input pulse. Additionally, the method includes calculating modal bandwidth of the FUT based on Pout(t).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.