Optical signal transmission system and magneto-optical modulator designed to establish modulation over wide range for use in the same
US6542647B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2001 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Oct 26, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/092
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical signal transmission system equipped with a magneto-optical modulator is provided. The magneto-optical modulator works to modulate an optical beam emitted from a light source and consists of a polarizer, a magneto-optical element, an analyzer, a dc field generator, a high-frequency field generator, and an impedance adjuster. The dc field generator works to apply a dc bias field to the magneto-optical element. The high-frequency generator is responsive to the high-frequency signal from said high-frequency signal generator to apply a high-frequency field to the magneto-optical element. The impedance adjuster works to adjust impedance of the high-frequency field generator for establishing effective transmission of the high-frequency signal to the high-frequency field generator, thereby increasing a modulation range up to frequencies higher than an upper limit of typical magneto-optical modulators. The application of the dc bias field and use of the impedance adjuster realizes the magneto-optical modulator which is useful up to a ferromagnetic resonance frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.